INSTALLATION OPERATION MAINTENANCE RROOTS · PDF fileRROOTS BLOWERS EXHAUSTERS COMPRESSORS...
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ROOTS ROOTS ROOTS BLOWERS EXHAUSTERS COMPRESSORS ® ® INSTALLATION OPERATION MAINTENANCE US $3.00, Canada $4.50 RAS and RAS Whispair ™ 10”- 20” Splash Lubricated ❏ Read starting check points under OPERATION. Run equipment briefly to check for obvious faults, and make corrections. Follow with a trial run under normal operat- ing conditions. ❏ In the event of trouble during installation or operation, do not attempt repairs of Roots furnished equipment. Notify nearest Sales Office giving all nameplate informa- tion plus an outline of operating conditions and a description of the trouble. ❏ Unauthorized attempts at equipment repair may void Manufacturer's warranty. Units out of warranty may be repaired or adjusted by the owner. It is recommended that such work be limited to the operations described in this manual, using Factory Parts. Good inspection and maintenance practices should reduce the need for repairs. Note – Information in this manual is correct as of the date of publication. The Manufacturer reserves the right to make design or material changes without notice, and without obli- gation to make similar changes on equipment of prior manu- facture. For your nearest Roots Sales Office call 765-827-9200. Do These Things To Get The Most From Your ROOTS ® blower Contents Information Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Operating Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 3-4 Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11 Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13 Preventative Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . .13 ❏ Check shipment for damage. If found, file claim with carrier and notify nearest Roots Sales Office. ❏ Unpack shipment carefully, and check contents against Packing List. Notify Sales Office if a shortage appears. ❏ Store in a clean, dry location until ready for installation. Lift by methods discussed under INSTALLATION to avoid straining or distorting the equipment. Keep covers on all openings. Protect against weather and corrosion if outdoor storage is necessary. ❏ Read LIMITATIONS and INSTALLATION sections in this manual and plan the complete installation. ❏ Provide for adequate safeguards against accidents to persons working on or near the equipment during both installation and operation. See SAFETY PRECAUTIONS. ❏ Install all equipment correctly. Foundation design must be adequate and piping carefully done. Use recommend- ed accessories for operating protection. ❏ Make sure both driving and driven equipment is correct- ly lubricated before start-up. See LUBRICATION. Troubleshooting Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . 14 Rotary Lube Blower Vibrations . . . . . . . . . . . . . . . . . . . . . .15 Maintenance/Replacements. . . . . . . . . . . . . . . . . . . . . . 16-20 Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-23 Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Assembly Drawings. . . . . . . . . . . . . . . . . . . . . . . . . 25, 26, 27 ILRB-3000 rev.1105 (formerly IRB-203-397)
Transcript of INSTALLATION OPERATION MAINTENANCE RROOTS · PDF fileRROOTS BLOWERS EXHAUSTERS COMPRESSORS...
ROOTSROOTSROOTSBLOWERS EXHAUSTERS COMPRESSORS
®®
INSTALLATION OPERATION MAINTENANCE
US $3.00, Canada $4.50
RAS and RAS Whispair™ 10”- 20” Splash Lubricated
� Read starting check points under OPERATION. Runequipment briefly to check for obvious faults, and makecorrections. Follow with a trial run under normal operat-ing conditions.
� In the event of trouble during installation or operation,do not attempt repairs of Roots furnished equipment.Notify nearest Sales Office giving all nameplate informa-tion plus an outline of operating conditions and adescription of the trouble.
� Unauthorized attempts at equipment repair may voidManufacturer's warranty. Units out of warranty may berepaired or adjusted by the owner. It is recommendedthat such work be limited to the operations described inthis manual, using Factory Parts. Good inspection andmaintenance practices should reduce the need forrepairs.
Note – Information in this manual is correct as of the date ofpublication. The Manufacturer reserves the right to makedesign or material changes without notice, and without obli-gation to make similar changes on equipment of prior manu-facture.
For your nearest Roots Sales Office call 765-827-9200.
Do These Things To Get The Most From Your ROOTS® blower
Contents
Information Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Operating Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9
Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-11
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13
Preventative Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . .13
� Check shipment for damage. If found, file claim withcarrier and notify nearest Roots Sales Office.
� Unpack shipment carefully, and check contents againstPacking List. Notify Sales Office if a shortage appears.
� Store in a clean, dry location until ready for installation.Lift by methods discussed under INSTALLATION toavoid straining or distorting the equipment. Keep coverson all openings. Protect against weather and corrosion ifoutdoor storage is necessary.
� Read LIMITATIONS and INSTALLATION sections in thismanual and plan the complete installation.
� Provide for adequate safeguards against accidents topersons working on or near the equipment during bothinstallation and operation. See SAFETY PRECAUTIONS.
� Install all equipment correctly. Foundation design mustbe adequate and piping carefully done. Use recommend-ed accessories for operating protection.
� Make sure both driving and driven equipment is correct-ly lubricated before start-up. See LUBRICATION.
Troubleshooting Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . 14
Rotary Lube Blower Vibrations . . . . . . . . . . . . . . . . . . . . . .15
Maintenance/Replacements. . . . . . . . . . . . . . . . . . . . . . 16-20
Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21-23
Parts List. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Assembly Drawings. . . . . . . . . . . . . . . . . . . . . . . . . 25, 26, 27
ILRB-3000 rev.1105 (formerly IRB-203-397)
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ROOTS® products are sold subject to the
current General Terms of Sale, GTS-5001 and
Warranty Policy WP-5020. Copies are
available upon request.
Contact your Roots Office
at 765-827-9200.
3For your nearest Roots office contact information, please consult the last page of this document.
Operating Characteristics
ROOTS® units covered in this manual represent both thebasic type RAS rotary lobe arrangement and the proprietaryRAS Whispair™ design. In size they range from 10 inchesthrough 20 inches gear diameter. All are equipped with aneffective splash oil lubrication system. From a principle usagestandpoint they are designated as air blowers.
The Roots rotary lobe blower is a positive displacement typeunit, whose pumping capacity is determined by size, operat-ing speed and inlet conditions. It employs two double-lobeimpellers mounted on parallel shafts and rotating in oppositedirections within a cylinder closed at the ends by headplates.As the impellers rotate, air is drawn into one side of the cylin-der and forced out the opposite side against the existingpressure. The differential pressure developed, therefore,depends on the resistance of the connected systems.
Effective sealing of the blower inlet area from the dischargearea is accomplished by use of very small operating clear-ances. (This feature also eliminates rubbing contact betweenrotating and stationary parts, hence, internal lubrication is notrequired.) Clearances between the impellers during rotationare maintained by a pair of accurately machined timing gears,mounted on the two shafts extending outside the air cham-ber.
Operation of the familiar basic rotary lobe blower is illustratedin Figure 1, where air flow is right to left from inlet to dis-charge with the lower impeller rotating clockwise. In Position1 it is delivering a known volume (A) to the discharge, whilespace (B) between the upper impeller and cylinder wall isbeing filled. Counterclockwise rotation of this impeller thentraps equal volume (B) in Position 2, and further rotationdelivers it to the discharge in Position 3. At the same time,another similar volume is forming under the lower impeller,and will be discharged when rotation reaches Position 1again.
One complete revolution of the driving shaft alternately trapsfour equal and known volumes of air (two by each impeller)and pushes them through to the discharge. The pumpingcapacity of a lobe blower operating at a constant speed there-fore remains relatively independent of reasonable inlet or dis-charge pressure variations. To change capacity it is neces-sary to change speed of rotation or vent some of the air.
Operation of the proprietary RAS Whispair design blower isrepresented in Figure 2. Air flow again is right to left, with thelower shaft rotation clockwise. This design differs from thebasic type rotary blower in that it provides a chamber on thedischarge side of the cylinder.
From this chamber two or more slots open back into the twoalternately closed pocket areas of the cylinder, shown as Aand B. These slots, at certain impeller positions, allow dis-charge pressure to bleed into the normally low pressurepockets. They also provide a jet action on the impellers in thedirection of rotation. Gradual pressure build-up in the pock-ets, to a level almost equal to the discharge pressure, reducesbackflow rate at the instant of pocket discharge so that puls-ing and shock noise are minimized.
Considering Position 1 in Figure 2, known volume (A) isbeing delivered to the discharge chamber while space (B) isbeing filled with an equal volume at inlet pressure. In Position2 this space has been sealed from in inlet, but some dis-charge pressure is now entering space (B) through the slotpassage, as indicated by the small arrows. Force of this jetgives a rotative assist to the impeller, while also buildingpressure in sealed space (B). Rotation continues to Position3, where volume (B) is delivered to the discharge chamber inthe same manner as volume (A) in Position 1. Because of thealmost complete pressure equalization through the slot,shock is minimized.
With either blower design, no attempt should ever be made to
Position 1 Position 2 Position 3
Figure 1 - Flow Through a Basic Type RAS Blower
Position 1 Position 2 Position 3
Figure 2 - Flow Through a RAS Whispair Blower
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To establish and maintain continued satisfactory perform-ance, and Roots blower must be operated within certainapproved limiting conditions. The Manufacturer's warrantyis, of course, contingent on such operation.
RAS/RAS-J blowers are available with two types of internalblower clearances, normal and open. Table 1 lists maximumpressure, temperature, vacuum and speed limits for bothtypes of clearances. Before operating a blower at the condi-tions under open clearances, make sure that your blower issupplied with open clearances, check with Factory. Table 8lists the values of normal clearances - Table 9 lists the valuesof open clearances. Do not exceed any one or combinationsof limits listed in Table 1.
Example: the listed maximum allowable temperature rise(increase in air temperature between inlet and discharge) forany particular blower may occur well before maximum speedor maximum pressure rating is reached. Temperature risethen is the limiting condition. In other words, the operatinglimit is always to be determined by the maximum ratingreached first. It can be any one of the three: pressure, tem-perature or speed.
Be sure to arrange connections or taps for thermometers andpressure or vacuum gauges at or near the inlet and dis-charge connections of the blower. These, along with a goodtachometer, will enable periodic checks of operating condi-tions to be made easily.
Note - Some special purpose blowers may be assembledwith nonstandard clearances other than shown in Table 8 or9. These units may be operated at pressure and or tempera-ture rises higher than those listed in applicable Table 1.Before doing so, however, request specific approval from thenearest Sales Office. Normally, when a blower is operated at
Operating Limitations
the design condition stamped on its nameplate, the specifiedlimits apply.
PRESSURE - On pressure service, the pressure rise inpounds per square inch (kPa) between blower inlet and dis-charge, must not exceed the figure listed for the specificblower and frame size concerned. Also, in any system wherethe blower inlet is at a positive pressure above atmosphere,the discharge pressure must never exceed 25 PSI (172 kPa)gauge regardless of blower size.
On vacuum service, with the discharge going to atmosphericpressure, the inlet suction or vacuum in inches of mercury(kPa) must not be greater than the values listed for the spe-cific frame size.
TEMPERATURE - Various blower frame sizes are approvedonly for installations where the following temperature limita-tions can be maintained in service.
A. Maximum temperature rise (T.R.) in Fahrenheit degrees(°C) must not exceed listed values when the inlet is at ambi-ent temperature. Ambient is considered as the general tem-perature of the space around the blower. This is not outdoortemperature unless the blower is installed outdoors.
B. If inlet temperature is higher than ambient, the listedallowable temperature rise values must be reduced by 2/3 ofthe difference between the actual measured inlet temperatureand the ambient temperature.
SPEED RANGE - Blowers may be operated at speeds up tothe maximums listed for the various frame sizes. They maybe direct coupled to suitable constant speed drivers if pres-sure/temperature conditions are also within limits. At lowerspeeds, excessive temperature rise may be the limiting fac-tor.
Technical assistance at installation by a factory ServiceEngineer is usually not required for the smaller units, frameseries 1000 through 1400. Workmen with general experiencein installing heavy machinery should be able to complete asatisfactory installation. Information in this manual is supple-mented by the more detailed discussions of foundations andpiping in API recommended practice 686 and theCompressed Air and Gas Handbook, published by theCompressed Air and Gas Institute, New York City and theAmerican Petroleum Institute, Washington, D.C. However, a
Service Engineer may be employed for assistance or for finalchecking of an installation.
Handling of the equipment should be accomplished by meth-ods conforming to safe practice for the weight involved.Weight of a bare unit, without base plate, driver or acces-sories will range from about 1 ton (910 kg) for the smallestto approximately 7 tons (6350 kg). On such units, an eyeboltis provided near each end for lifting. A unit mounted on abase plate should be lifted only by the four lifting lugs provid-
Installation
control capacity by means of a throttle valve in the intake ordischarge piping. This increases the power load on the driver,and may seriously damage the blower. Likewise, if a possibili-ty exists that flow to the blower inlet may be cut off duringnormal operation of a process, then an adequate vacuumrelief valve should be installed in the inlet line near the blow-er. A pressure type relief valve in the discharge line near theblower is also strongly recommended for protection againstcut-off or blocking in this line.
When a belt drive is employed, blower speed can usually beadjusted to obtain desire capacity by changing the diameterof one or both sheaves. In a direct coupled arrangement, a
variable speed motor or transmission is required, or air maybe vented through a manually controlled unloading valve andsilencer. If discharge air is returned to the blower inlet, itmust go through a cooling by-pass arrangement.
Before making any change in blower capacity or operatingconditions, contact the nearest Sales Office for specific infor-mation applying to your particular blower. In all cases, oper-ating conditions must be maintained within the approvedrange or pressures, temperatures and speeds as stated underLIMITATIONS. Also, the blower must not be used to handleair containing liquids or solids. Serious damage to the rotat-ing parts will result.
5For your nearest Roots office contact information, please consult the last page of this document.
ed. Weight in this case will be greater than the following fig-ures.
Before lifting with eyebolts, test one for tightness and frac-tures by tapping with a hammer. Direction of pull on the bolts
during lift should be nearly vertical. Since a considerablecable angle will usually be unavoidable, place a stiff spreaderbetween the eyebolts to take the side strain, and adjust cablelengths so that the unit is approximately level during the lift.
FrameSize
100610091012101610181021102410301212*121612201222122512281236141414181422142514281431143514421616*1620*1625*16271630163316391643*16481821*182418271830*1833184118451849*185420222026203320372040204420502055*2060
SpeedRPM
1800
1500
1300
1130
1000
900
Press. RisePSI (kPa)
15 (103)15 (103)15 (103)12 (83)
11.7 (80)10.4 (71)9.2 (63)7.3 (50)15 (103)
16.5 (113)12 (83)
11.7 (80)10.5 (72)9.2 (63)7.3 (50)20 (138)
16.8 (115)12.0 (83)12.2 (84)11.0 (75)9.8 (67)8.8 (60)7.3 (50)20 (138)
17.6 (121)14.0 (96)11.0 (75)11.0 (75)10.6 (73)9.0 (62)8.2 (56)7.3 (50)
18.8 (129)16.5 (113)14.6 (100)12.0 (83)11.7 (80)9.6 (66)8.8 (60)8.0 (55)7.3 (50)
19.6 (135)16.6 (114)12.0 (83)11.0 (75)11.0 (75)10.0 (68)8.8 (60)7.9 (54)7.3 (50)
Inlet Vac.Inches Hg. (kPa)
15 (50)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)16 (54)16 (54)12 (40)12 (40)12 (40)12 (40)12 (40)16 (54)16 (54)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)16 (54)16 (54)16 (54)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)16 (54)16 (54)16 (54)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)16 (54)16 (54)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)12 (40)
Temp. Rise°F (°C)
205 (114)205 (114)205 (114)148 (82)148 (82)148 (82)148 (82)148 (82)223 (124)223 (124)148 (82)148 (82)148 (82)148 (82)148 (82)230 (128)230 (128)140 (78)140 (78)140 (78)140 (78)140 (78)140 (78)230 (128)230 (128)230 (128)140 (78)140 (78)140 (78)140 (78)140 (78)140 (78)230 (128)230 (128)230 (128)140 (78)140 (78)140 (78)140 (78)140 (78)140 (78)225 (125)225 (125)135 (75)135 (75)135 (75)135 (75)135 (75)135 (75)135 (75)
Press. RisePSI (kPa)
20 (138)20 (138)18 (124)13.3 (92)11.7 (80)10.4 (71)9.2 (63)7.3 (50)20 (138)
16.5 (138)13.2 (91)11.7 (80)10.5 (72)9.2 (63)7.3 (50)20 (138)
16.8 (115)13.7 (94)12.2 (84)11.0 (75)9.8 (67)8.8 (60)7.3 (50)20 (138)
17.6 (121)14.0 (96)13.0 (89)11.7 (80)10.6 (73)9.0 (62)8.2 (56)7.3 (50)
18.8 (129)16.5 (113)14.6 (100)13.2 (91)11.7 (80)9.6 (66)8.8 (60)8.0 (55)7.3 (50)20 (138)
16.6 (114)13.0 (89)11.7 (80)11.0 (75)10.0 (68)8.8 (60)7.9 (54)7.3 (50)
Inlet Vac.Inches Hg. (kPa)
16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)15 (50)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)15 (50)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)15 (50)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)15 (50)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)15 (50)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)16 (54)15 (50)
Temp. Rise°F (°C)
280 (156)280 (156)280 (156)240 (133)240 (133)240 (133)240 (133)240 (133)270 (150)270 (150)235 (131)235 (131)235 (131)235 (131)235 (131)280 (156)280 (156)230 (128)230 (128)230 (128)230 (128)230 (128)230 (128)280 (156)280 (156)280 (156)230 (128)230 (128)230 (128)230 (128)230 (128)230 (128)280 (156)280 (156)280 (156)230 (128)230 (128)230 (128)230 (128)230 (128)230 (128)280 (156)280 (156)225 (125)225 (125)225 (125)225 (125)225 (125)225 (125)225 (125)
**Approx.Weight Lbs.
1920208022402455252026103055347031303480372038954090425047604700500053305500580060606350692057006000630066006850725078008000820078008100840088509300975010100104001065098001025011200118001245013100138001430014750
Normal Clearances - RP68 Open Clearances - RP71
*Sizes Not Available in RAS ** Bare Shaft Blower Weight
Table 1 - Maximum Allowable Operating Conditions
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A harness featuring four lifting hooks is required to lift base-mounted units. After inserting the hooks in the lifting lugs,block the chains out on the sides to avoid placing the unitunder strain. At the same time, adjust lengths to produce alevel lift.
LOCATION of the installation is generally not a critical matter.A clean, dry and protected indoor location is to be preferred.However, an outdoor location will give satisfactory service ifcorrect lubrication for expected temperatures is provided.Effect of such a location on driver and other equipment mustalso be considered.
PROTECTION of internal machined surfaces against normalatmospheric corrosion is normally provided at the factory,using a vaporizing inhibitor. Markings on the flange coverswill indicate this protection. Maximum period of protection isone year under average conditions, if flange covers and clos-ing seals are not removed. Protection against chemical orsalt water atmosphere is not provided. Leave covers andtape seals over all openings as long as possible during instal-lation to avoid loss of protection.
If there is to be an extended period between installation andstart up, the following steps should be taken to insure corro-sion protection:
1. Coat internal of cylinder, gearbox and drive end bearingcovers with a vapor phase rust inhibiting liquid such asNox-Rust VCI-10. Repeat once a year or as conditionsmay require. VCI-10 is oil soluble and does not have tobe removed before lubricating. If desired, VCI-10 may beremoved from within the cylinder shortly before start upby spraying fine mist of petroleum solvent through theblower while it is running at a slow speed with open inletand discharge, or it can remain in the blower if it is notharmful to the operation of the connected system. VCI-10 is a product of Daubert Chemical Co., Oak Brook, IL.
2. Paint shaft extension, inlet and discharge flanges, and allother exposed surfaces with Nox-Rust X-110 or equiva-lent.
3. Seal inlet, discharge, and vent openings. It is not recom-mended that the unit be set in place, piped to the sys-tem, and allowed to remain idle for extended periods. Ifany part is left open to the atmosphere, the VCI-10 vaporwill escape and lose its effectiveness.
4. Units are not to be subjected to excessive vibration dur-ing storage.
5. Rotate drive shaft three or four revolutions every twoweeks.
6. Prior to start up, remove flange covers on both inlet anddischarge and inspect internal to insure absence of rust.Check all internal clearances. Also, at this time, removegearbox and bearing covers and inspect gear teeth andbearings for rust.
When ready to connect piping, remove main flange coversand inspect blower interior for presence of foreign particlesor dirt adhering to machined surfaces. Clean out such materi-al by washing carefully with a petroleum solvent then rotateimpellers manually to make sure they turn freely. Also use the
same solvent to remove the anti-rust coating from flangefaces and any other surfaces. Note: interior cleaning is notrequired if no dirt is found.
FOUNDATION design depends on local soil conditions andseveral other factors and can only be discussed generallyhere. Additional information will be found in the publicationreferred to at the beginning of this section. For satisfactoryoperation of supported equipment, a concrete foundationmust be rigid, must have minimum defections, and must befree from resonant frequencies in the operating speed rangeof the equipment.
Length and width dimensions of the foundation should pro-vide at least 6 inches (150 mm) from any edge to the nearestmachine anchor bolt, as located from the certified manufac-turer's general arrangement drawing. Depth dimensionshould be determined by design, but a minimum practicaldepth is considered to be twice the distance between shaftcenters (or gear diameter) of the unit, or sufficient depth toattain a concrete mass a minimum of 1-1/2 times the weightof the blower and motor. The concrete block should be per-mitted to cure for a minimum of 28 days before the blower isgrouted in place. Any block distortions during curing then willhave little or no affect on equipment and alignment. To sim-plify machine leveling and provide good grouting bond, thetop of the foundation should be struck-off as level as possiblebut left with a rough surface.
Spring-type vibration isolating mounting are not recommend-ed for use directly between the operating equipment and thefoundation. Where such mountings are required, they shouldbe designed to carry a reinforced concrete slab on which theequipment is mounted. This slab must have good rigidityagainst bending and twisting, and the suspension system willrequire careful adjustment to produce a reasonably level con-dition during operation. All piping will require flexible sectionsand supports to reduce connection strains on the unit to aminimum.
Direct use of structural framing members for mounting is notrecommended. If unavoidable, it should be restricted to unitsof the smaller frame sizes, and spring-type mountings shouldnot be used. Structural members must be rigid, and willprobably require reinforcement if part of a building. Noisetransmission can be reduced by use of a cork isolating pad.This can be 1 to 2 inch (25-50 mm) thickness, bedding on afull steel plate attached to the structure and carrying rigidconcrete slab on which the equipment is mounted.
ANCHOR BOLTS are to be placed within the foundation formsbefore concrete is poured. Foundation bolts installed asshown in Figure 3, with diameter and length as in Table 2 are
Figure 3 - Typical Anchor Bolt Detail
7For your nearest Roots office contact information, please consult the last page of this document.
recommended. The bolts must be located as accurately aspossible from dimensions on certified installation drawing.To obtain a bolt location tolerance of 1/8” (3mm), use ofdrilled templates firmly secured to the foundation forms isrecommended.
The bolt sleeves shown, if kept centered around the boltsand free of concrete, will allow bolts to be sprung enough tocorrect for small variations in bolt setting and machinedrilling. The sleeves are filled in the final grouting operation.Bolt positions should be adjusted vertically so that the topends will extend at least 1-1/2 diameters above the soleplateor taper washer, or as shown on the installation drawing.
Jack screws are provided to make leveling the height adjust-ments easier. Steel plates, approximately 4" x 4" x 1/2 " (100x 100 x 13 mm) should be placed on the foundation undereach jack screw location. Plates and anchor bolts are not fur-nished as standard accessories.
LEVELING is very important and should be performed withcare, using a good machinists level having a ground glassbubble vial. A setting as level as possible in all directions isthe result to be worked toward. Blowers should be leveledfrom drive shaft and pipe flanges. Machined baseplates havepads running in both length and width directions. On sole-plates, the machined top surfaces are used for leveling.Scrape pads or surfaces clean, and remove burrs on highpoints with a flat file.
When blower and driver have been factory mounted on acommon baseplate, the assembly is to be treated as a unitfor leveling purposes. Use the jack screws to establish grout-ing space under the base flanges, and to level the base.Adjust these screws until the indicated variation from leveldoes not exceed .001" per foot (.08 mm per m) in eitherlength or width. Any variations should all be in the samedirection, to minimize twist. The maximum allowable twist is
considered to be .001" per horizontal foot (.08 mm per hori-zontal m) measured between any two sections of the base.
Units mounted on soleplates are to be leveled in a similarmanner. The plates should be large enough to provide exten-sions for leveling in both length and width on the finishedupper surfaces. Fasten the plates solidly to the blower feet,which are machined flat and parallel to each other, then installand level the blower carefully, using jack screws, shims orwedges for adjusting.
When a satisfactory condition of level is obtained, turn theanchor bolt nuts down snug but not tight. Elimination of twisthere is very important, and minor adjustments can be madewith shims directly under the blower feet.
ALIGNMENT of the drive shafts when the blower unit and itsdriver are direct coupled requires careful attention. This pre-caution will not only help insure satisfactory coupling opera-tion, but will minimize chances for damage to either drivingor driven unit from vibration or thrust forces.
In package units with driver and blower mounted on a commonbaseplate, the two shafts will have been put in approximatealignment at the factory. However, baseplate deflections canoccur during shipping and installation. A close coupling align-ment should be obtained during leveling, so that only small finaladjustments will need to be made after grouting. In a soleplatetype installation, the separately mounted driver must be posi-tioned, leveled and aligned as part of the installation procedure.Whether it is on soleplates or on its own base, shims of 1/16" to1/8" (2-3 mm) thickness placed directly under the driver feetbefore setting will permit more accurate final alignment.Spacing between the two shaft ends as required by the couplingmust also be established. If a motor is being used that has end-play in the shaft, be sure its rotor is located on magnetic centerbefore setting this spacing.
When blower is driven through V-belts, the driver must bemounted on an adjustable base to permit tightening orremoving the belts. In this case the driver shaft height is ofno concern, but it must be parallel to the blower shaft andlevel. To position the driver properly, both sheaves need to bemounted on their shafts, and the shaft center distance mustbe known.
The blower sheave, usually the larger one in diameter, mustbe of the narrow hub type. Install it so that its inner hub faceis not more than 1/4” (6 mm) away from the bearing housingend cover. The driver sheave should also be mounted asclose to its bearing as possible. Now position the driver sothat faces of the two sheaves are accurately in line, with theadjustable base so located as to make 2/3 of its total move-ment available in the direction away from the blower. Thispositioning provides minimum belt wear and slip, and allowssufficient adjustment for installation and tightening of belts.Do not install belts until grouting has set and anchor bolts aretightened.
Blowers intended for driving by V-belts may be provided with anextended drive shaft and an additional outer bearing to handlethe side pull of the drive. They may be recognized by theextended housing for the outer bearing. If necessary, theseunits may also be used for direct coupling to the driver. Blowersintended specifically for direct coupling have no outer bearing,and may be seriously damaged if used for belt drive. Consultyour Sales Office for approval before belting these units.
GROUTING follows completion of leveling and preliminary
UnitFrameSeries
1000
1200
1400
1600
1800
2000
Dia.
1
1
1-1/8
1-1/8
1-1/4
1-1/4
Lgth.
25
25
25
25
25
25
I.D.
3
3
3
3
3
3
Lgth.
18
18
18
25
25
25
Dia.
3/4
3/4
3/4
1
1
1
Lgth.
18
18
18
25
25
25
I.D.
2-1/2
2-1/2
2-1/2
3
3
3
Lgth.
12
12
12
18
18
18
For Soleplates For BaseplatesBolts Sleeves Bolts Sleeves
UnitFrameSeries
1000
1200
1400
1600
1800
2000
Dia.
2.4
2.4
3.0
3.0
3.0
3.0
Lgth.
64
64
64
64
64
64
I.D.
7.5
7.5
7.5
7.5
7.5
7.5
Lgth.
46
46
46
46
46
46
Dia.
2.0
2.0
2.0
2.4
2.4
2.4
Lgth.
46
46
46
64
64
64
I.D.
6.5
6.5
6.5
8.0
8.0
8.0
Lgth.
30
30
30
46
46
46
For Soleplates For BaseplatesBolts Sleeves Bolts Sleeves
Table 2A – Standard Anchor Bolts in Inches
Table 2B – Standard Anchor Bolts in (cm)
8
alignment. Assuming the foundation has been properlycured, its top surface should first be roughened by chippingto remove glazed areas and oil or grease removed with astrong hot detergent or caustic solution.
Grouting serves not only to compensate for surface irregu-larities in the foundation and machine base but also to pro-vide restraint against shifting. Anchor bolts are used
for hold-down only. Therefore, the grout must be adequatethickness under the soleplate or base flange, must flow intoanchor bolt sleeves and all interior cavities, and must haveminimum shrinkage during the setting period. By virtue ofthe open frame design, it is recommended that the bed¬platebe filled with concrete to a level equal to the top of the mainchannels. Special grouting materials designed to counteractshrinkage are commercially available, and are often preferredto cement. The manufacturer's instructions should be fol-lowed in using these materials. Care must be exercised whenemploying non-shrink additives with cement, as too muchcan be worse than none. Any gas forming or air-entrainingadditives should be avoided completely, since they tend toreduce grout strength.
Wait at least 24 hours before tightening anchor bolts or con-necting any piping. When jack screws have been used forleveling, make sure the bottom of the leveling screw is treat-ed according to grout manufacturer's instructions so thatleveling screw can be backed off. Such points of concentrat-ed loading are likely to wear during machine operation,resulting in loose anchor bolts. Final bolt tightening shouldbe only enough to hold the machine firmly against the foun-dation and prevent vibration.
After all anchor bolts are secured, recheck the blower fortwist and level. Working from the finished pad on top of thecylinder, make corrections to meet the requirements speci-fied under LEVELING by shimming under the blower feet.Then rotate the drive shaft by hand to make sure bothimpellers turn freely at all positions.
When the blower is direct coupled to its driver, final align-ment of the two shafts should be accomplished next byadjusting the shims under the driver feet. This needs to bedone with the greatest possible care. Even though a flexiblecoupling can accept some degree of misalignment, it shouldnot be forced to compensate for careless workmanship. Theflexing or sliding member in a coupling will transmit undesir-able forces between the two shafts in proportion to thedegree of misalignment, thus promoting vibration andunnecessary wear problems.
MISALIGNMENT can be of two basic types, offset and angu-lar, but usually it will be a combination of both. For satisfac-tory coupling operation it is recommended that the followinglimits be used: maximum deviation in offset alignment not
greater than .005" (.13 mm) total indicator reading on thecoupling hubs; maximum deviation from parallel of the insidecoupling faces not greater than .001" (.03 mm) whenchecked at six points. Where driver is a steam turbine, thefinal alignment should be made with the turbine at operatingtemperature in order to allow for shaft movement resultingfrom expansion.
A coupling that has been Factory installed as part of a pre-assembled package should receive the same final alignmentcheck as outlined above. It will need to be disassembled byremoving cover bolts, removing or drawing back the twocover halves, and removing the internal member. In somecases the latter item may have been packed separately forshipment. After necessary adjustments for alignment arecompleted, lubricate the coupling with grease as specified byits manufacturer and assemble.
A belt-driven installation should require no realignment if allitems were correctly positioned and leveled before grouting.Belts may be installed now by adjusting driver positiontoward the blower sufficiently to permit belts to be laid intheir sheave grooves easily. Do not pry or roll them intoplace. Before doing this, inspect all grooves for burrs, roughspots or oil that might shorten belt life. If equipment is not tobe operated immediately, leave the belts slack.
Proper tensioning of the drive for operation should be donein accordance with manufacturer's recommendations, keep-ing in mind that excessive tension can seriously overloadshaft bearings and also lead to premature drive failure.Under-tensioning can produce slippage, with consequentloss of blower capacity in addition to belt damage.
Make sure at this point that driver rotation is correct to pro-duce the blower shaft rotation indicated by an arrow near theshaft. Blowers are not reversible, hence drive shaft rotationand discharge flange location are predetermined in manufac-turing assembly. Figure 4 illustrates the assembly optionsavailable by specification on original order, to meet pipingand drive requirements.
PIPING must be clean, and should be sized so that air veloci-ty in the line will not exceed 100 feet per second (30 m persecond). When a blower is being operated at or near its max-imum volume rating, the pipe size should not be smaller thanthe blower connections. Where possible, use long radiuselbows to insure smooth flow. Design the piping layout sothat no strains are placed on the blower, either from weightor expansion forces. This means providing adequate sup-ports, anchors, and expansion joints or loops.
Installation of a spool-type rubber expansion joint near theblower inlet connection is recommended. A similar unit withcontrol elements added to minimize piping vibrations may berequired near the discharge. Use of SNUBBERS or
Figure 4 – Rotation and Discharge, Vertical and Horizontal RAS and RAS Whispair Blowers
Vertical Horizontal
9For your nearest Roots office contact information, please consult the last page of this document.
SILENCERS in the inlet or discharge piping will be dependenton such factors as blower speed, operating pressure, lengthand kind of piping, and consideration of sound level require-ments in the general surrounding area. For specific silencerrecommendations refer to the nearest Sales Office.
Inlet piping should be completely free of valves or restric-tions, but when a shut-off valve cannot be avoided, makesure a full size vacuum relief valve is installed near the blowerinlet connection. See Figure 5. This will protect against anoverload caused by accidental valve closing. Further protec-tion can be provided by installation of a dependable pressuresensitive device with alarm or shutdown action.
During initial operation, install a temporary corrosion resist-ant screen at the compressor inlet connection. Screen shouldbe made of 16 mesh (.020" diameter) wire backed with 2mesh wire cloth. Backing cloth-wire diameter shall be a mini-mum of 0.063" diameter for 12" pipe, 0.080" diameter for 16"pipe, 0.105" diameter for 20" pipe, and 0.120" diameter for
24" pipe. For 30" and 36" pipe use 1 mesh backing cloth witha minimum of .180" wire diameter for 36" pipe. The tablebelow gives approximate screen pressure drop. A manometerconnected to read pressure drop across the screen will indi-cate when it needs cleaning. Do not allow pressure drop toexceed 55 inches H2O. Clean and replace the screen untildebris no longer appears. Do not leave it installed permanent-ly, as the wire will eventually deteriorate and pieces may gointo the blower causing serious damage. (Typically, screensare installed 1-2 days of operation.)
Discharge piping requires a pressure relief valve, and shouldalso include a suitable pressure gauge and a manually operat-ed unloading valve. The latter permits starting under no-loadconditions. The optional back pressure regulator shown infigure 5 will be required if volume demands vary while bloweroperates at constant speed. It may be vented if only air isbeing handled. A vent silencer may be required, depending onpermissible sound levels in the general surroundings.
In some installations, particularly where two or more blowersdischarge into a common header, it is recommended that adirect acting or free swinging check valve be provided in eachdischarge line. These valves, properly installed protectagainst damage resulting from reverse rotation caused byback flow through an idle blower.
In making pipe connections to the blower, use special care inlining up the mating flanges. They must contact squarely andaccurately, without imposing strain on the blower casing. Anyattempt to draw flanges together by force will probably distortthe blower and cause internal contacts. Also, the blowershould not carry more than the weight of one pipe fitting ateach connection. After bolting up the flanges, rotate the driveshaft by hand to check for rubbing contacts caused by strainsor dirt.
Figure 5 – Installation with Suggested Locations for Available Accessories
Flow(ACFM)
2,500
5,000
10,000
15,000
20,000
30,000
45,000
12”
3.0
12.7
16”
1.1
3.9
15.5
20”
0.3
1.7
6.4
14.4
24”
0.3
0.8
3.0
7.2
12.7
30”
1.3
2.8
5.1
11.4
36”
1.4
2.4
5.5
12.3
Pipe Dia. (Inches)
Approximate Screen Pressure Drop, Inches H2O(16 Mesh, .020” Wire Dia.)
*Use pulsation dampeners if swithces are connected as shown. Switches & gauges can be connected upstream of inlet silencer & downstream of discharge silencer.
A - SEPARATE OPPOSITE GEAR END RESERVOIRS
A simple and reliable splash lubrication system is employedin ROOTS® blowers. All friction parts - gears, bearings andshaft seals - are lubricated either by dipping directly into oilreservoirs or by receiving splash oil from other rotatingparts. All reservoirs require the same grade of oil as speci-fied in Table 3 for various ambient temperature ranges at theinstallation site. Reference to the appropriate assembly draw-ing, Figure 15, will assist in understanding of the followingdiscussion.
At the opposite gear end of the blower, the upper (or driven)shaft bearing is lubricated from its own oil reservoir, formedby the bearing carrier (6) and the deep blind end cover (5A).At a normal oil level, bearing rollers dip into the oil as theyroll through the bottom of their raceway. The oil picked up iscarried over the top by bearing rotation, and some of ittransfers to the shaft behind the bearing to lubricate thedynamic lip-type inboard seal (27). A slight amount of oilmay work through this seal, but it will be thrown off by theshaft slinger, and further prevented from reaching the airchamber by a labyrinth type seal where the shaft passesthrough the headpiece. The chamber between the two sealingpoints is vented to atmosphere and serves not only to drainany seal leakage but also to keep the lubrication system atatmospheric pressure.
At the lower (driving) shaft the arrangement is the same asdescribed above when a short shaft for direct coupling isprovided. Here an outboard shaft seal (23) is provided in theend cover (5). On V-belt driven blowers the drive shaft andbearing carrier (63) are extended and provided with andadditional inboard bearing (60). This creates a larger reser-voir requiring about three times as much oil to fill.Lubrication is the same as for the shorter shaft, except thattwo protruding screws (96) are provided to insure adequatesplash oil for bearing (60).
At the gear end of the blower the bearings, seals and timinggears are enclosed by a gearbox containing a double (pri-mary and secondary) oil sump arrangement. In a verticalstyle blower the secondary sump is formed of sheet steeland contoured around the bottom half of the lower gear. It isfed with oil at a controlled rate from the surrounding primarysump in the gearbox itself, through a metering orifice in thesecondary wall. The lower gear teeth pick up oil and carry itto the meshing point with the upper gear, from where it issplashed onto oil control shields with leaders that direct theoil to the two bearings. A dam at each bearing maintains thedesired oil level there, with excess overflowing into the gear-box primary sump. Inboard sealing of the shafts is the sameas at the drive end. In a horizontal style blower the gear end
10
Lubrication
lubrication arrangement is identical, except that a secondarysump is formed around each gear and the total oil capacity ismore than doubled.
Note - A good grade of industrial type non-detergent, anti-foaming oil should be used when the average of blower inletand discharge temperature is 125°F (52°C) or lower. Oilshould be changed after the first 100 hours of operation.After initial oil change, normal oil change periods underthese conditions may be considered as 2000 operatinghours. At higher temperatures these oils may turn black andleave carbon deposits. For average temperatures above125°F (52°C) it is recommended that oil with an efficient oxi-dation inhibitor be used, and that change interval be reduced.Shell TELLUS is a suitable oil type with the required charac-teristics, and equivalent oils from other suppliers areassumed to be comparable in performance. Suggested oilchange periods for the higher operating temperatures are asfollows:
Average Temp. °F (C°) Operating Hrs.
Below 150 (65) 1000
151-160 (66-71) 500
Above average temperature of 180°F, use of synthetic oil likeROOTS Synfilm ST Synthetic Oil is specified.
On the gearbox and the two opposite gear end bearingssumps, oil levels are indicated in sight windows. All threesight windows are completely unobstructed circular discs,and the oil level should always be in view.
Approximate capacities in gallons or fluid ounces for thethree sump locations are given in Table 4 as a guide. Actualfilling requirements may vary slightly from the listed figures.Select a good industrial grade of oil per Table 3 for the exist-ing ambient temperature conditions.
Filling of the oil sump must be performed with the blowernot operating, so that correct levels may be established. Atthe gearbox, remove vent plug (37) in the top and pour inslightly less oil than indicated in Table 4 for the blower sizeconcerned, or until the oil rises to the center of the sightglass. Wait several minutes for the levels to equalize betweenthe primary and secondary sumps, then add more oil if need-ed, or drain excess at plug (67).
The opposite gear end sumps use constant level oilers. To fillthe sumps, remove the top glass reservoir. Fill it with oil andplace it on its holder and let the bottle empty to fill the sump.To obtain proper oil level in the sump, that is to the center ofthe sight glass (90), pull out level adjuster "A" (see fig.6) andraise or lower cross-arm "B" as needed, secure "B" with lock
AmbientTemperature
Above 90°F. (32°C)
32° TO 90° (0°-32°C)
0° to 32° (-18°-0°C)
Below 0°F. (-18°C)
Table 3 - Recommended Lubricating Oils
Viscosity Range SSu at100%°F. (83°C)
1000-1200
700-1000
500-700
300-500
Figure 6
11For your nearest Roots office contact information, please consult the last page of this document.
"C" and drop assembly back into lower reservoir and replacebottle. Note - Raising "B" raises oil level and lowering "B" low-ers oil level.
During operation the sump levels can be expected to fluctu-ate. At the gearbox sight window the level will rise as a resultof oil being thrown out of the secondary sump (oil pan) intothe primary sump. A satisfactory oil level is assured as longas it is visible in the window. A blower should not be operat-ed when the oil is either above or below the circle on thesight window.
Oil levels at the opposite gear end will fall slightly duringoperation because of the apparent "loss" carried in the bear-ings and on the shafts. To be satisfactory, the level must bevisible in the sight glass.
During the first week of blower operation, check the oil leveldaily and watch for leaks. Replenish oil as necessary.Thereafter, an occasional check should be sufficient. Drainplugs (67 and 88) are provided at the bottom of gearbox andbearing sumps.
B - COMMON OPPOSITE GEAR END RESERVOIRS
Some blowers are equipped with a common reservoir on theopposite gear end. The small reservoirs are replaced with alarge cover similar to that covering the gear end. The oil istransmitted to the bearings by use of a slinger plate whichdips into the oil. The oil is then captured and directed to thebearings by oil control shields. Reference to the sectionaldrawings at the back of this manual will help in understand-
ing this system.
The lubrication of the gear end of the blower remains asdescribed earlier.
Approximate opposite gear end oil sump capacity is a shownin Table 5.
Some blowers utilizing the common O.G.E. reservoir are sup-plied with oil level switches. The recommended procedure forsetting these switches is as follows:
1. Prior to starting the blower:
A) Add oil to the reservoirs until the level is in the centerof the bullseye sightglasses.
B) Disconnect the level switch from the blower shut-down system.
C) Position the level switch slightly above the oil level sothe switch is not as yet reset.
2. Start the blower and allow the oil temperature to stabilize(approximately 1/2 hour running time).
3. Slowly begin to lower the position of the oil level switch,and mark the height at which it resets.
4. If only an oil level shutdown is to be used, continue tolower the switch until it is 3/4" below the position wherethe switch reset, and lock it in place.
5. If an oil level alarm is to be used as well as a shut down,lower the switch 1/2" below the point where the alarmswitch reset, and lock the switch in place.
Lip seal oil leakage - Some oil seal leakage will occur at thedrive shaft seal and the headplate seals since an oil filmunder the lip is required for proper operation. Periodically, theleaked oil should be wiped off from the blower as well asbase plate surfaces, since even a small amount of leaked oilspreads over a larger area making the leakage look worsethan actual.
BlowerFrameSize
100012001400160018002000
Vertical
3/4 (2.8)1-1/2 (5.7)1-3/4 (6.6)2-1/2 (9.5)
3 (11)4 (15)
Horizontal
2 (7.6)3-1/2 (13)
4 (15)5-3/4 (22)7-1/2 (28)9-3/4 (37)
Drive ShaftCoupled
4 (.12)5 (.15)8 (.24)9 (.27)16 (.47)19 (.56)
Drive ShaftBelted
12 (.36)16 (.47)28 (.83)
xxx
Gearbox - gallons (liters) Opposite Gear End Bearings - fluid oz. (liters)
Table 4 - Oil Sump Capacities
DrivenShaft
4 (.12)5 (.15)8 (.24)9 (.27)16 (.47)19 (.56)
BlowerFrameSize
100012001400160018002000
Vertical
3/4 (2.8)1-1/2 (5.7)1-3/4 (6.6)2-1/2 (9.5)
3 (11)4 (15)
Horizontal
2 (7.6)3-1/2 (13)
4 (15)5-3/4 (22)7-1/2 (28)9-3/4 (37)
Gearbox Gal./ (liters)
Table 5 – Common O.G.E. Sump Capacity
O.G.E. Gal./ (liters)
Vertical
3/4 (2.8)1-1/2 (5.7)1-3/4 (6.6)2-1/2 (9.5)
3 (11)4 (15)
Horizontal
2 (7.6)3-1/2 (13)
4 (15)5-3/4 (22)7-1/2 (28)9-3/4 (37)
12
Operation
Before operating a blower under power for the first time,recheck the unit and the installation thoroughly to reduce thelikelihood of troubles. Use the following procedure check listas a guide, but consider any other special conditions in theinstallation.
1. Be certain that no bolts, tools, rags or dirt have been leftin the blower air chamber.
2. Be certain that inlet piping is free of any debris. Use ofthe temporary protective screen at the blower inlet asdescribed under INSTALLATION is strongly recommendedduring early operation. If an outdoor intake without filter inused, be sure the opening is clean and protected by a strongscreen.
3. Check blower leveling, drive alignment, belt tension andtightness of all mounting bolts if installation is not recent.
4. Turn drive shaft over by hand to make sure impellers willrotate without bumping or rubbing at any point.
5. Check the blower lubrication system. Oil level should beat the center of the sight glasses.
6. Make sure driver (and gear unit if supplied) are properlylubricated. Check that power is available and that all electricaloverload and safety controls installed, connected and in oper-ating condition.
7. Open the manual unloading valve in the discharge air line,and make sure that any blocking valve in the inlet piping isopen.
8. Bump blower a few revolutions with driver to check direc-tion of rotation and to see that both units coast freely to astop.
9. Start blower, let it accelerate to full speed, then shut off.Listen for any knocking sounds, both with power on and alsoas it slows down.
10. If no problems have appeared, restart unit and operate for5 to 10 minutes under no-load conditions as paragraph 7.Check the cylinder surfaces all over by feeling to locate any
hot spots indicating impeller rubs. Continue to listen for nois-es and watch for changes in vibration. If all conditions areacceptable, proceed as follows:
11. Continue operating, but gradually close the dischargeunloading valve to establish normal operating conditions asclosely as possible. It is recommended that pressure and vac-uum gages and good thermometers be used in both inlet anddischarge locations to permit determination of pressure riseand temperature rise across the blower. Observe the pressureincrease as the unloading valve is closed, and do not allow itto exceed the rating of the specific blower as listed underLIMITATIONS.
12. All conditions being satisfactory to this point, continuethe run for about one hour. Observe the pressure and temper-ature rise periodically to make sure neither exceeds specifiedlimits. Continue to check for noises and hot spots, andobserve oil level behavior at the three sumps. If troubleappears, refer to the TROUBLESHOOTING CHECKLIST forsuggested remedies.
The unit should now be ready for continuous duty under fullload. During the first several days, make periodic checks tobe sure that all conditions remain reasonably steady andwithin limits. These checks may be especially important if theunit is part of a process system where conditions may vary.At the first opportunity, stop the blower and clean or removethe protective inlet screen. At the same time, verify leveling,coupling alignment or belt tension, and anchor bolt tightness.
Should operation of an air blower prove that its capacity is alittle too high for actual requirements, a small excess may beblown off through the manual unloading or vent valve. Neverrely on the pressure relief valve as an automatic vent. Suchuse may cause the discharge pressure to become excessive,and can also result in failure of the valve itself. If blowercapacity is low, refer to TROUBLESHOOTING CHECKLISTbefore contacting the nearest Sales Office for recommenda-tions. Be prepared to give all operating conditions andrequirements.
Safety Precautions
For equipment covered specifically or indirectly in thisinstruction book, it is important that all personnel observesafety precautions to minimize the chances of injury. Amongmany considerations, the following should particularly benoted:
• Blower casing and associated piping or accessoriesmay become hot enough to cause major skin burns oncontact.
• Internal and external rotating parts of the blower anddriving equipment can produce serious physicalinjuries. Do not reach into any opening in the blowerwhile it is operating, or while subject to accidentalstarting. Cover external moving parts with adequateguards.
• Disconnect power before doing any work, and avoid by-passing or rendering inoperative any safety or protec-tive devices.
• If blower is operated with piping disconnected, place astrong coarse screen over the inlet and avoid standingin the discharge air stream.
• Stay clear of open inlet piping (suction area) of pres-sure blowers, and the open discharge blast from vacu-um blowers.
• Stay clear of the blast from pressure relief valves andthe suction area of vacuum relief valves.
• Avoid extended exposure in close proximity to machin-
13For your nearest Roots office contact information, please consult the last page of this document.
Preventative Maintenance
1. Daily
A. Record the following:
1) Lube oil pressure (if applicable).
2) Lube oil temperature (if applicable).
3) Blower inlet temperature.
4) Blower inlet pressure.
5) Blower discharge temperature.
6) Blower discharge pressure or differential pres-sure.
7) Motor amperage.
8) Motor voltage, if available.
9) Motor stator temperature, if available.
10) Motor bearing temperature, if available.
B. Observe any abnormalities, i.e. burned paint, unusualnoises, vibration, strange odors, oil leaks, etc.
C. Review log sheets to determine if there are anychanges from previous readings. (It is very important tolook for any changes or trends which might indicatepending problems).
D. Check oil levels.
E. Record hour meter readings.
2. Monthly
A. Record bearing housing vibration levels at each bear-ing in the horizontal, vertical, and axial planes. Use veloc-ity (in./sec.) measurements and note any changes fromprevious readings. Take a complete vibration signature(amplitude versus frequency) if any trends are noted. (Itmay be helpful to keep a chart on monthly readings.)
3. Quarterly
A. Sample lube oil or change.
B. Change oil if the following values are exceeded:
1) Water 100 PPM maximum.
2) Metals 200 PPM maximum.
3) Acid 5.0 to 7.5 Mg/KOH/g maximum.
C. Increase frequency of sampling if any of the abovevalues show about 20 to 25% increase over the lastsample.
D. Flush all oil reservoirs before filling with clean oil.
4. Annually
A. Remove an inlet expansion joint, inspect impellers,measure impeller clearances and note wear patterns.
B. Check coupling alignment, inspect coupling for wear,and repack with fresh grease.
C. Inspect oil cooler tubes, as applicable.
D. Check all protective switches for proper setpoints andoperation.
E. Check V-belt drive condition and tension.
5. A Preventative Maintenance Schedule should be estab-lished for driver(s) and all accessories in accordancewith the applicable manufacturer's recommendation.
ery which exceeds safe noise levels.
• Use proper care and good procedures in handling, lift-ing, installing, operating and maintaining the equip-ment.
• Casing pressure must not exceed 25 PSI (172 kPa)gauge. Do not pressurize vented cavities from an exter-nal source, nor restrict the vents.
• Do not use air blowers on explosive or hazardousgases.
• Other potential hazards to safety may also be associat-ed with operation of this equipment. All personnelworking in or passing through the area should bewarned by signs and trained to exercise adequate gen-eral safety precautions.
14
Trouble
No Flow
Low Capacity
Excessive Power
Overheating ofBearings or Gears
Vibration - Refer to"Rotary Lobe BlowerVibrations"
Item
1
2
3
4
5
67
8
910
1112
131415
161718
19
2021
Possible Cause
Speed too low
Wrong Rotation
Obstruction in piping
Speed too low
Excessive pressure rise
Obstruction in pipingExcessive slip
Speed too high
Excessive pressure riseImpellers rubbing
Inadequate lubricationExcessive lubrication
Excessive pressure riseCoupling misalignmentExcessive belt tension
MisalignmentImpellers rubbingWorn bearings/gears
Unbalanced or rubbingimpellers
Driver or blower loosePiping resonances
Remedy
Check by tachometer and compare with speed on Roots OrderAcknowledgment.Compare actual rotation with Figure 4 or 5. Change driver ifwrong.Check piping, screen, valves, silencer, to assure open flowpath.
See item 1. If belt drive, check for slippage and readjust ten-sion.Check inlet vacuum and discharge pressure, and comparethese figures with specified operating conditions on order. See item 3.Check inside of casing for worn or eroded surfaces causingexcessive clearances.
Check speed and compare with Roots OrderAcknowledgement.See item 3.Inspect outside of cylinder for high temperature areas, thencheck for impeller contact at these points. Look for excessivescale build-up. Correct blower mounting, drive alignment.
Check oil sump levels in gearhouse and drive end covers.Check oil levels. If incorrect, drain and refill with oil of recom-mended grade.See item 5.Check carefully. Realign if questionable.Readjust for correct tension.
See item 14.See item 10.Check gear backlash and condition of bearings, and replace asindicated.Scale or process material may build up on casing andimpellers, or inside impellers. Remove build-up to restore orig-inal clearances and impeller balance. Tighten mounting bolts securely.Determine whether standing wave pressure pulsations arepresent in the piping. Refer to Sales Office.
Troubleshooting Checklist
15For your nearest Roots office contact information, please consult the last page of this document.
The general vibration severity charts derived from Rathbonevibration severity charts provide guidelines for machinesbasically having mass unbalance-turbomachinery, electricmotors, etc. The German specification VDI 2056 - Criteria forAssessing Mechanical Vibrations of Machines - providesvibration guide lines for machines with rotating masses (tur-bomachinery) and machines having mass effects which can-not be balanced (reciprocating machines), but does notspecifically address rotary lobe blowers (also known asROOTS Blowers) with inherent fluctuating dynamic bearingloads and torques.
API Standard 619, Rotary Type Positive DisplacementCompressors for General Refinery Services, limits the vibra-tion level to 0.1 in/sec peak, which is quite ambitious.
Based on experience, practical acceptable vibration levels liesomewhere between API 619 requirement and VDI 2056allowance for group D reciprocating machines.
Elements Generating Vibrations in Rotary Lobe Blower:
1. Blower inherent characteristic -
a. Impacting bearing loads excite component/system nat-ural frequencies.
b. Pressure pulsations set up vibrations at four times therunning speed.
2. Rotary lobe blowers use very close clearances betweenthe impellers and the housing. The impeller contact willsetup vibrations as follows:
a. Impeller to impeller frontal lobe contact - if contact isbetween only one set of lobes, the vibration frequencywill be 1XRPM, if both sets of lobes contact, the vibra-tion frequency will be 2X RPM.
b. Impeller to cylinder contact - the vibration frequencywill depend on the number of impeller tips contacting thecylinder which could range from one to four times theRPM.
c. Impeller to head plate contact - the vibration frequencywill be erratic and unsteady.
3. Damaged gears will generate vibrations at mesh frequen-cy, number of teeth times RPM.
4. Damaged bearings will generate vibrations at ball passfrequency, fundamental train frequency and ball spin fre-quency.
5. Rotor unbalance and bent shaft will generate vibrationsat 1XRPM.
6. Blower/driver coupling misalignment will generate vibra-tions at 1XRPM and 2XRPM.
7. Acoustic resonance in the blower inlet/discharge pipingwill generate vibrations at 4XRPM.
8. Operation of rotary lobe blower at or near system tor-sionals may cause impeller lobe contact and increasesvibrations.
9. External piping if not properly isolated will transmitvibrations into the blower.
10. Foundation design and method of mounting has consid-erable effect on blower vibrations.
Vibration Criteria:
1. Units of measurement: Rotary lobe blower vibrations aremeasured in inches/sec. Measurements of spike energyis not recommended for judging blower conditionbecause the rotary lobe blower has inherent impactingbearing loads.
2. Measurement location: Vibrations should be measured atthe bearing locations on the housing.
The following table provides an appropriate assessmentguideline for rotary lobe blowers rigidly mounted on the stifffoundations.
Unfiltered Vibrations Assessment(in/sec peak)
>0.62 thru 1.0 Satisfactory
>1.0 Review Required
If the blower is operating at "review required" levels then theinstallation must be fully evaluated to determine the source orcause of vibration and the cause shall be corrected.
In general, blower vibration levels should be monitored on aregular basis and the vibration trend observed for progressiveor sudden change in level. If such a change occurs, the causeshould be determined through spectral analysis.
The blower vibrations will be transmitted into the motor,speed reducer etc. and more so if they are mounted on thecommon blower baseplate. Allowable vibration levels intothese accessories should be obtained from the vendors.
Rotary Lobe Blower Vibrations
16
A good program of inspection and maintenance servicing, iffollowed consistently, is the most reliable means of prevent-ing costly repairs to a blower. A simple record of proceduresand dates will help maintain this work on a regular schedule.Basic requirements are lubrication and cleaning, along withperiodic checking for increased vibration and hot spots onthe cylinder. Inlet and discharge pressures and temperaturesshould be observed frequently, to minimize the chances fortrouble resulting from blower ratings being exceeded. Aboveall, the unit must be operated within its specifications.
In a blower properly installed and operated, there is no mov-ing contact between the two impellers, or between theimpellers and cylinder or headplates. Wear is then confined tothe timing gears, the bearings which support and locate theshafts, and shaft seals. All are lubricated, and wear should benormal if they are always supplied with clean, high gradelubricating oil. Shaft seals, weather lip type or rotatingmechanical type, are subject to deterioration as well as wear.They may require replacement at varying periods. O-ringsshould be replaced at each disassembly.
If trouble should occur during operation, and its cause cannotbe readily determined, consult the TROUBLESHOOTINGCHECKLIST. Remedies suggested there can usually be per-formed by qualified mechanics, using procedures detailed inthis manual. Major repairs not covered here are consideredbeyond the scope of maintenance, and should be referred tothe nearest Sales Office. See listing on the last page.Warranty failures should not be repaired at all, unless specif-ic approval has been obtained through a Sales Office beforestarting the work. Unauthorized disassembly within the war-ranty period may void the warranty.
Where repairs involve parts replacement, it is recommendedthat Factory Parts be used to insure fit and suitability. Delayin making such repairs can be reduced by having spare partson hand.
When ordering parts, please furnish all information from theblower nameplate.
Repairs or adjustments to blowers should be performed bypersonnel with a good background of general mechanicalexperience and the ability to follow the detailed instructions inthis manual. Some operations involve extra care and a degreeof precision work. This is especially true in timing impellers,and in handling bearings. Experience indicates that a highpercentage of bearing failure is caused by dirt contaminationbefore or during assembly. Therefore, clean the work areabefore starting disassembly, and protect new or reusableparts during progress of the work.
The following detailed work procedures cover repairs andadjustments that can normally be handled successfully at theinstallation site. Numbers shown in brackets ( ) correspondto Item Numbers used in the sectional assembly drawingsand in Table 9. Refer to the drawing applying to the type unitbeing repaired while reading the instructions.
A - REMOVING GEARS WITH GEAR LOCKING ASSEMBLIES
1. Drain oil at plug (67) near bottom of gearbox (3).
2. Loosen cap screws (30) attaching gearbox to headplate
3. Attach lifting device to support gearbox and remove cap-screws. Move gearbox out of way.
4. Match mark gears so that they can be returned to thesame shafts in same position.
5. Gradually release gear locking assembly capscrewsevenly all round. Initially each screw should be releasedabout a quarter of a turn only to prevent tilting and jam-ming of collars. DO NOT REMOVE LOCKING SCREWSCOMPLETELY OR THE COLLAR MAY SPRING OFF CAUS-ING INJURY. Just loosen the locking assembly, both col-lars should be loose on the tapered inner rings. Toloosen the back collar, tapping on the locking screwsmay be necessary. To loosen the front collar, use ofwedges between the collar and the gear web may berequired
6. Using two puller holes in the gear (see Table 6 for size)pull the gears off the shafts,
Table 6 - Puller Hole Sizes
B - INSTALLING GEARS WITH GEAR LOCKING ASSEMBLIES
1. Apply NEVERSEEZ paste on the gear locking device screwthreads, under the screw heads, on the tapered rings, onthe collar tapers, and on the gear hub outside diameters.
2. Slide each tapered ring collar and the web clearanceholes and screw them loosely into the opposite collar.
3. Do not tighten screws at this time.
4. DEGREASE GEAR HUB BORE AND SHAFT. THE GEARFIT
Maintenance/Replacements
Figure 7 - Gear Locking Assembly
Blower Size
1000
1200
1400, 1600
1800, 2000
Gear Puller Hole Size
1/2 - 13
3/4 - 10
1 - 8
1-1/4 - 7
Carrier Puller Hole Size
5/8 - 11
5/8 - 11
3/4 - 10
1 - 8
17For your nearest Roots office contact information, please consult the last page of this document.
MUST BE FREE OF ANY LUBRICANT.
5. Install two 12" long threaded rods (sizes are give in Table5) in the bearing carrier puller holes. Line up the gearpuller holes with the rods and using proper nuts on theguide rods, push the gears on flush with the shaft end.Make sure that the gear match marks line up. Take any 3or 4 locking screws equally spaced and snug them up.
6. Set impeller timing as described under Step 4 ofOperation C.
7. Once satisfactory timing is achieved, locking screws areto be tightened to Table 7 values, using a calibratedtorque wrench. Tighten all locking screws gradually andall the way around in either clockwise or counter-clock-wise sequence, but not in diametrically oppositesequence. Tighten screws half a turn at a time. Checkand make sure that no screw will turn any more byapplying specified torque.
10" TAPER BORE GEAR REMOVAL PROCEDURE
1. Remove the gear nut.
2. Install Gear Remover within 1/8th inch of the gear face.This gap is necessary to unseat gear from the shafttaper.
3. Apply Neverseez on 3/4-10X3" long, grade 8 capscrewthreads and under hex heads.
4. Install capscrews through gear remover holes into thegear puller holes.
5. Tighten these capscrews quarter turn at a time in eitherclockwise or counter-clockwise sequence, but not dia-metrically opposite sequence, till the gear is unseatedfrom the taper.
6. If the gear does not come off using above method, usehydraulic assist feature provided in the gear in additionto the above. Hydraulic pump capable of generatingabout 20,000 PSI pressure is required. Make sure alltubing and fittings are good for 40000 PSI. The gearconnections are 1/4 NPT. Hook up pump to bottom con-
nection. Leave top hole open. Crank the pump till someoil comes through the open hole bleed¬ing all air out.Close the top hole with 1/4 NPT solid steel plug. Crankthe pump up till the gear comes off. Do not exceed20,000 PSI oil pressure. If not sure how to use thehydraulic removal system, contact factory.
10" TAPER BORE GEAR INSTALLATION PROCEDURE
1. Block the impellers inside the blower using woodenblocks/wedges.
2. Degrease gear bore and shaft taper. THESE SURFACESMUST BE FREE OF OIL.
3. Screw the inside ring onto the shaft, snug it up againstthe gear by hand.
4. Slide outside ring onto the inside ring.
5. Apply Neverseez on the threads and under the head ofthe installation capscrews. Install the capscrews fingertight.
6. Install indicator on the gear outside face for measuringthe gear axial movement.
FrameSeries
1000
1200
1400
1600
1800
2000
GearCapscrew
Size - Metric
M8
M8
M10
M10
M12
M16
Gear CapscrewTorque Values,LB-FT (kg-M)
(4.2) 30
(4.2) 30
(8.3) 53
(8.3) 60
(13.8) 100
(33.2) 240
Stub ShaftScrews LB-FT
(kg-M)
45 (6)
75 (10)
75 (10)
105 (15)
105 (15)
250 (35)
Table 7 - Torque Wrench Data
Figure 8 - Taper Gear Remover
Figure 9 - Gear Remover Material - Steel, Hardness - Rc-25
18
7. Tighten each screw quarter turn at a time in either clock-wise or counter-clockwise sequence, but not diametrical-ly opposite sequence, till the outer ring is solid againstthe inside ring. THE GEAR SHOULD MOVE .065 to .075".
8. Loosen up the installation capscrews and remove thegear installation tooling.
9. Install gear locknut and tighten nut with a spannerwrench.
C - TIMING THE IMPELLERS
1. Disconnect the piping at both inlet and discharge flanges
of the machine, moving the pipe flanges at least farenough away for easy insertion of an arm into the open-ings.
2. Use a set of feeler gauges with blades about 12" (300mm) long for measuring clearances between the impellerlobes. These clearances are identified as "front" and"backs", and are measured with the impellers in the posi-tions shown in Figures 13 and 14. The drive shaft rota-tion indicated is counter-clockwise. For opposite rotation,impeller positions will be reversed from that shown inFigures 13 and 14 and the front and back identificationswill be interchanged. Fronts may be defined as the lobesthat tend to contact during rotation because of pressureload and gear tooth wear; conversely, backs are the sur-faces that tend to separate.
3. Determine and record the total lobe clearance by meas-uring the front and back clearances and adding them. Itwill normally be satisfactory to take these measurementsat the mid-point of the impeller length. Place a wedgebetween the gear teeth to prevent the impellers fromshifting during the measurement, making sure that anygear tooth clearance is always taken up in the samedirection. Note that there are two front and two backclearance positions in one complete revolution, useminimum value of clearance found along length ofimpeller for fronts and backs throughout 90° rotation.
4. Loosen the screws on one gear (make sure collars areloose) to permit slight adjustments of position rela tiveto its impeller, and set the impeller "front" clearance sothat it is two-thirds of the total clearance found in Step 3.Make sure that any backlash in the gears is taken up inthe direction of rotation with the lower gear driving.
5. Tighten all screws as in Step 7. OPERATION B, andrecheck front and back clearances.
Figure 10 - Taper Gear Installation
Figure -11 Outside Ring Material - Steel, Hardness - Rc-25 min
Figure 12 - Inside Ring Material - Steel, Hardness - Rc-25 min
Figure 13 - Impeller Timing Viewed from Gear End RAS/RGSStandard Rotation
Figure 14 - Same as Figure 14 Except Shows RAS/RGS WhispairCylinder
19For your nearest Roots office contact information, please consult the last page of this document.
D - REMOVING BEARINGS AND/OR SEALS
1. Dismantle as in Operation A.
2. Remove gear end bearing carriers (6). Bearings and shaftseals will come out with the carriers. Discard the O-rings(20). Impellers will now be supported by the labyrinthseals in headplate holes.
3. Dismount drive and remove drive end cover (5) and/ or(58), using care with seal (23).
4. Remove bearing locknuts (24) and lockwashers (25),using a spanner wrench.
5. Remove bearing clamp plates (8).
6. Pull drive end bearing carriers with bearings and seals ason gear end. Shims (17) under the flanges should bekept in order and identified for replacing the same posi-tions.
E - REPLACING LIP SEALS (RAS/RAS WHISPAIR)
1. Check shafts for surface finish of 10-16 micro-inch (.3 to.4 micrometers) RMS in seal contact area, and for goodcondition at bearing locations. Carefully remove anyburrs or sharp corners, but do no attempt refinishing.
The seals are "Directional, Hydrodynamic", which means forproper sealing they are completely dependent on the direc-tion of the shaft rotation. In each seal kit, there are:
(2) Clockwise (CW) "Blue coated" seals for inboard sealreplacement
(2) Counter-Clockwise (CCW) "Red coated" seals for inboardseal replacement
(1) Reversible )CW/CCW) "Green coated" seal for drive shaftseal replacement
(1) Protective Sleeve Tool (Inboard seals)
(1) Protective Sleeve Tool (Drive shaft seal)
CAUTION: FOR SEALS TO PERFORM PROPERLY
• Use careful handling procedures so not to damage sealsduring installation. Must use the installation sleeves pro-vided in kit as shown Under Final Assembly. Seal lips arenot very flexible and will tear or become damaged if notinstalled properly.
• Shaft surface must be clean and free of scratches with afinish between 10 to 20 RMS.
• Seals must stay on shipping rings until time of installa-tion, or the seal lips will deform over time.
NOTE: Proper sealing for shafts that have been repaired witha "speedi-sleeve". depends on the quality of the "speedi-sleeve" and its installation.
2. Finish the assembly as outlined in "Final Assembly".
F - FINAL ASSEMBLY
1. Install all bearings. Making sure they are up tight againsttheir respective shaft shoulders. Work on gear end bear-ings first and press them info place by means of a suit-able length of tubing in contact only with the inner races.The impellers will be driven against the opposite head-plate. Then remove shims (17) from behind both driveend bearing carrier flanges and press the bearings at this
Seal Installation Guide
Inboard Seal Installation and Drive Shaft Seal Installation
20
end into place against their shaft shoulders.
On a belt-drive unit with extended shaft, use spacersleeve (62) to push inboard bearing (60) into its finalposition. There is no shaft shoulder behind this bearing,but there is a stop for the sleeve. Make sure that theinner race flange of bearing (60) is facing outboard.
2. Install bearing lockwasher (25) and locknuts (24) oneach shaft, and tighten nuts with a spanner wrench. Lockthe nuts by bending a tab on each washer into a slot inthe nut.
3. Install new or original gears and set impellers asdescribed in Operation B.
4. Place bearing clamp plate (8) over main bearing (31) andtighten all screws. In the case of the extended type driveshaft, end cover (58) serves as the clamp plate but can-not be installed until later.
5. Using 1/2" (13mm) feeler gauges, determine for each ofthe drive end bearings (31) the maximum clearancebetween the outer race and one of the rollers near thetop. Obtain pieces of brass shim stock, of thicknessescorresponding to these clearances, about 3/4" (19mm)wide and long enough to reach completely through thebearings. Push one piece through each bearing, in thespaces between rollers, then rotate that shaft so that oneroller of each row is up on the shim stock. This removesall clearances, and forces the bearing rollers and races tocenter as in normal running. Refer to Figure 15.
6. Set the impellers lengthwise in the case by using longpieces of shim stock, or feelers, as wedges between thetwo ends of each impeller and the headplates. Using thetotal end clearance obtained in Step 8 of Operation D, thetwo ends of each impeller and the headplates. Using thetotal end clearance obtained in Step 8 of Operation D,place wedges equal to two-thirds of the total at the gearend and one-third at the drive or thrust end. It will benecessary to bump the shafts to obtain the requiredimpeller positions. Set the drive end clearance first, afterinstalling and tightening drive shaft end cover (58) ifused.
7. With feeler gauges, carefully measure the spaces betweenthe drive end bearing carrier flanges and the headplateface. Insert shims (17) of correct thickness to fill thesespaces. The original shims should be correct if bearingsand carriers have been returned to the original location.
8. Remove wedges from ends of impellers inside the casing.
9. Tighten all bearing carrier flange screws.
10. Recheck impeller end clearances for proper values pertables, then remove brass shim stock from both bearings(31).
11. Check front and back clearances of impeller lobes as out-lined in Operation C, and reset timing if not correct.
12. Reassemble the unit, starting by installing the main endcover (5) and then proceeding in reverse order throughOperation A from Step 5. Be careful with lip seal (23) ornew O-ring (59) in end cover (5).
13. Check the work area to make sure no parts have been leftout in assembly.
14. Turn the drive shaft over several times by hand as finalcheck for impeller contact or case rubs.
15. Reinstall coupling or belt sheave, check their alignmentwith driver and reconnect all external piping.
16. Start and operate unit for a reasonable period in the man-ner outlined for initial starting. See OPERATION.
IMPELLER CLEARANCES
Instructions on impeller clearances under Operation C andOperation D do not include data on the amount of clearanceto be expected. For blowers in good condition this informa-tion is not essential in field service work. However, situationsmay arise where it is desirable to compare existing clearanceswith the correct values. Listed in Table 8 or 9 are the rangesof values used in original factory assembly. Clearances maychange in service, but they should never be less than theminimum values listed. Only well qualified personnel shouldattempt to measure clearances for comparison with this data.
FIGURE 15
21For your nearest Roots office contact information, please consult the last page of this document.
WHEN ORDERING CONTACT:
Dresser Roots
900 West Mount Street
Connersville, IN 47331-1675
Phone: 765-827-9200
Rapifax: 765-827-9309
Repair Kit Information For RAS/RAS-J Splash Lube Blowers 10" - 20"
REF. QTY. PART DESCRIPTION
17 1 SHIM SET
18 1 GASKET
19 2 GASKET SUMP (P/L)
20 4 0 RING B/C (PL)
23 1 SEAL-DR. SHAFT
24 2 LOCKNUT-BRG.
25 2 LOCKWASHER-BRG.
27 4 SEAL-HDPLT
31 4 BEARINGS
60 1 BEARINGS *
61 2 O-RING
81 2 GASKETS
- 1 SET GEAR SCREWS **
*V-BELT KITS ONLY ** 12" KITS AND ABOVE
SIZE REPAIR KIT NOS. REPAIR KIT NO.
(CPLG DRIVE) (V-BELT DRIVE)
10” RK10ACPOO RK10AVBOO
12” RK12ACPOO RK12AVBOO
14” RK14ACPOO RK14AVBOO
16” RK16ACPOO
18” RKACPOO
20” RK20ACPOO
Repair Kit Part Numbers
22
23For your nearest Roots office contact information, please consult the last page of this document.
24
ItemNumber
1
1A
2
3
5
5A
6
7
9
10
12
13
14
15
16
17
18
22
23
24
25
26
27
28
29
30
31
34
35
36
37
42
43
45
49
56
58
QuantityUsed
1
1
1
1
1
1
4a
2
2
2
2
1
1
1
4 halves
1
Varies
1
2
2
8
4
2
2
Varies
4
1
6
8 or 0d
1
Varies
Varies
16
1
1
Identification
Headplate - Gear End
Headplate - Drive End
Cylinder
Gearbox
End Cover - Driving (Cplg.)
End Cover - Driven Shaft
Bearing Carrier
Impeller
Timing Gear
Timing Gear Locking Assembly
Stub Shaft - Gear End
Stub Shaft - Driving
Stub Shaft - Driven
Key - Drive Sheave or Coupling
Shims – Brng. Carrier, Drive End
Gasket - Gearbox Flange
Capscrew - End Cover (Soc. Hd.)
Shaft Seal - Outboard
Bearing Locknut
Bearing Lockwasher
Lockwasher - Brng. Carrier (See 49)
Shaft Seal - Inboard
Air Vent - Drive End
Eyebolt - Lifting
Capscrew - Gearbox & Headplate Fig.
Bearing - Roller
Nameplate
Drive Screw - Nameplate & Arrow
Dowel Pin - Flange Locating
Vent Plug - Gearbox
Capscrew - Stub Shaft (Soc. Hd.)
Taper Pin - Stub Shaft, Gear End
Capscrew - Brng. Carrier (See 26)
Rotation Arrow
End Cover - Driving (Belted)
a. All units having extended shaft for belt drive, use three item 6 and one item 63.b. Vertical style units, use one item 84. Horizontal units, require two item 84.c. Used on sized 1000 through 1400 only.d. Units of frame sizes 1000 through 1400 except 1442 use four item 100. Frames
1600 through 2000 and 1442 use eight item 36.
e. Vertical style units use one item 110 and one item 111. Not required on horizontal units.f. Inboard bearing item 60 is a double row spherical type on current production
units, and the cylindrical roller bearing on older units will be replaced with the new spherical roller bearing.
ItemNumber
60
61
62
63
64
66
67
69
70
71
72
73
74
75
76
77
78
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
100
110
111
QuantityUsed
1
2
1
1
2
1
1
4
4
2
4
1 or 2c
2
2
2
1 or 2b
4
Varies
1
6
2
2
1
1
2
4 or 0d
1 or 0e
1 or 0e
Identification
Bearing - Inboard (f)
O-ring - End Cover
Spacer Sleeve - Outboard Brng.
Bearing Carrier - Extended Drive
Dowel Pin - End Cover
Air Vent - End Cover (Belted)
Plug - Gearbox Drain
Plug - Bearing Housing
Plug - Instrument Taps
Leveling Label
Set Screw - Leveling
Spacer Ring - Drive End Bearing
Gasket - Brng. Carrier, Gear End
Oil Dam - Gear End Bearing
Oil Control Shield
Oil Pan (Secondary Sump)
Capscrew - Oil Pan
Self-Tap Screw - Oil Pan
Gauge Oil Level - Gear End
Plug - Drive end Fill & Drain
Locking Nut (See 96)
Gauge Oil Level - Drive End
Lube Nameplate - Gear End
Lube Nameplate - Drive Enc
Slinger Set Screw (See 89)
Dowel Pin - Flange Locating
Oil Shroud
Oil Shield
Table 10 - Parts Identification List for Figures 17, 18 or 19
25For your nearest Roots office contact information, please consult the last page of this document.
Figu
re 1
7 - A
ssem
bly
of B
asic
10”
Ver
tical
CSL
Sty
le B
low
er
26
Figu
re 1
8 - A
ssem
bly
of R
AS W
hisp
air V
ertic
al S
tyle
Blo
wer
27For your nearest Roots office contact information, please consult the last page of this document.
Figu
re 1
9 - A
ssem
bly
of R
AS W
hisp
air V
ertic
al S
tyle
Blo
wer
Contact List
Roots Factory Service & Repair Centers
Dresser Roots – Houston Service CenterDresser Roots Factory Service & Repair Center
11611B Tanner Rd.Houston, TX 77041
Toll Free: 1-800-866-6182Ph: 713-896-4810Fax: 713-896-4927
Dresser Roots – Connersville Service CenterDresser Roots Factory Service & Repair Center
900 West Mount StreetConnersville, IN 47331
Toll Free: 1-877-442-7910Ph: 765-827-9306/9217
Fax: 765-827-9263
Dresser Roots – United Kingdom Service CenterDresser Roots Factory Service & Repair Center
PO Box B7Off St Andrews Road
Turnbridge, Huddersfield England HD1 6RB
Ph: +44 (0) 1484 422 222Aftermarket Direct Line: +44 (0) 1484 487 669
Aftermarket email: [email protected] Fax: +44 (0) 1484 487 657
Dresser Roots – Mexico Service CenterDresser Roots Factory Service & Repair Center
Henry Ford No 114Esq. Roberto Fulton
Fracc. Industrial San NicolasTlalnepantla, Edo de Mexico
Cp 54030Ph: +52 55 5317 5486Fax: +52 55 5317 5358
©2005 Dresser, Inc. all rights reserved. • Printed in the U.S.A. • RAM and WHISPAIR are trademarks of Dresser, Inc. • ROOTS is a registered trademark of Dresser, Inc.
Dresser RootsConnersville Operation900 West Mount StreetConnersville, IN 47331Ph: 765-827-9200Fx: 765-827-9266
Dresser RootsHolmes OperationPO Box B7Off St. Andrews RdTurnbridge, HuddersfieldEngland HD1 6RBPh: +44 (0) 1484-422222Fx: +44 (0) 1484-422668
Dresser RootsHeadquarters16240 Port Northwest DriveHouston, TX 77041Toll Free (US): 877-363-ROOT(S)Ph: 832-590-2305Toll Free Fax: 877-357-7238Fx: 832-590-2326
website: www.rootsblower.com • US email: [email protected] • UK email: [email protected] rev.1205 (formerly IRB-203-397)
Parts & LubricantsToll Free: 1-877-442-7901
Phone: 765-827-9254/9242Fax: 765-827-9205
Service & WarrantyToll Free: 1-877-442-7903
Phone: 765-827-9305Fax: 765-827-9309
CUSTOMER SERVICE
