9852 1866 01_RC 50 Technical Manual_LOWres

8/12/2019 9852 1866 01_RC 50 Technical Manual_LOWres

1/20

Technical ManualRead this instruction manual before operating this equipment.

Secoroc Down-the-hole Equipment

RC 50 Technical Manual

Reverse Circulation


2/20


3/203WARNING: This manual contains data SPECIFIC to Reverse Circulation Downhole Drills.

CONTENTSRead this instuction manual

before operating this equipment.

INTRODUCTION .......................................4

SAFETY ......................................................5 Be aware of safety information

Understand signal words Follow instructions

Keep DTH in good working condition

Wear protective clothing

Check for underground utility lines

Avoid electrocution, stay away

Loose parts

Live air

Air pressure

Do not work in trench

Check laws and regulations

Place warning barriers around work site

Observe environmental protection regulation

MAINTENANCE AND REPAIR ....................7

DTH disassembly ...................................7

DTH inspection ......................................11

DTH assembly ......................................12

SPECIFICATIONS ........................................14

PARTS LISTS .............................................16

Secoroc Down-the-hole Equipment

RC 50 Technical Manual

Reverse Circulation


4/20WARNING: This manual contains data SPECIFIC to Reverse Circulation Downhole Drills.4

READ THIS MANUAL CAREFULLY to learn how to operateand service your DTH correctly. Failure to do so could result

in personal injury or equipment damage. Consult your Atlas

Copco Secoroc dealer if you do not understand the instructions

in this manual or need additional information.

THIS MANUALshould be considered a permanent part ofthe DTH , and should remain with the DTH and available for

reference at all times.

WARRANTYis provided as part of Atlas Copco Secorocsupport program for customers who operate and maintain

their equipment as described in this manual.

MEASUREMENTSin this manual are given in both Englishand metric units, and are used to provide additional worldwide

understanding. Metric units are shown between parentheses

( ). Use only correct replacement parts and fasteners.

The instructions, illustrations, and specifications in this

manual are based on the latest information available at timeof publication. Your DTH may have improvements and options

not yet contained in this manual.

INTRODUCTIONThe RC 50 Reverse Circulation

ABBREVIATIONSused throughout this manual.

acfm Actual Cubic Feet per Minute

API American Petroleum Institute

C Centigrade

dia. Diameter

deg. DegreeF Fahrenheit

ft. Feet

ft.-lb Foot Pounds

gpm Gallons per Minute

in. Inches

kg kilogram

l Liter

lbs. Pounds

lpm Liters per Minute

m Meter

mm Millimeter

mm Hg Millimeters of Mercury

m3/min Cubic Meters per Minute

psi Pounds per Square Inchpsig Pounds per Square Inch Gauge Pressure

rpm Revolutions per Minute

scfm Standard Cubic Feet per Minute

Safety Alert Symbol

This product is covered by one or more of the

following U.S. Patents Other patents may bepending.

Patent Expiration

4,821,812 09/08/08

5,025,875 05/07/105,085,284 12/26/09

5,143,162 09/27/115,139,095 09/27/11

5,174,390 05/17/115,207,283 03/02/12

5,240,083 04/21/125,301,761 03/09/13

5,325,926 02/05/135,390,749 01/31/14

5,562,170 08/30/15

5,566,771 08/30/155,647,447 06/10/16

5,682,957 12/21/155,699,867 07/31/16

5,711,205 10/30/165,735,358 06/06/16

5,794,516 08/20/166,135,216 01/04/20

6,799,641 01/06/24

6,810,974 01/03/24



Safety regulationsBe aware of safety information

UNDERSTAND SIGNAL WORDS

A signal word DANGER, WARNING, or CAUTION is used

with the safety-alert symbol.

DANGER identifies the most serious hazards.

DANGERDanger is used to indicate the presence of a hazardwhich will cause severe personal injury or death ifthe warning is ignored.

WARNINGWarning is used to indicate the presence of ahazard which can cause severe injury or death ifthe warning is ignored.

CAUTIONCaution is used to indicate the presence of ahazard which will or can cause personal injury, orproperty damage if the warning is ignored.

SAFETY

Follow instructionsCarefully read all safety messages in this manual and on your

machine s safety labels. Keep safety labels in good condition.

Replace all missing or damaged safety labels.

Replacement safety labels can be obtained at no cost from

your local Atlas Copco dealer or representative or by contacting

the factory.

Learn how to operate the DTH and how to use the controls

on the machine properly. Do not let anyone operate this DTH

without proper instruction.

If you do not understand any part of this manual and need

assistance, contact your local Atlas Copco dealer.

Keep DTH in good working conditionKeep your DTH in proper working condition.

Unauthorized modifications to the DTH may impair the function

and/or safety and effect DTH life.

Make sure all safety devices, including shields are installed and

functioning properly.

Visually inspect the DTH daily before using. Do not operate the

DTH with loose, worn, or broken parts.

Wear protective clothingWear APPROVED safety equipment (safety shoes, safety

glasses, hearing protection, hard hat, gloves, respirator, etc.)

when operating or maintaining the DTH .

Wear close fitting clothing and confine long hair.

Operating equipment requires the full attention of the operator.

Do not wear radio or music headphones while operating the

DTH .

Check for underground utility linesBefore starting work, remember that contact with buried

utilities may cause serious injury or death. Electric line contact

may cause electric shock or electrocution. Gas line contact may

rupture pipe causing explosion or fire. Fiber optic cables can

blind you if you look into the laser light in them. Water line

rupture may cause a flood and possible ground collapse. Before

drilling, check with qualified sources to properly locate all buried

utilities in and around drill path. Select a drill path that will not

intersect buried utilities. Never launch a drill bit on a path

toward electric, gas, or water lines until their location is known.

If there is any doubt as to the location of the underground

placement, have the utility company shut it off before starting

any underground work and excavate to confirm its exact

location.



Do not work in trenchDo not work in trench with unstable sides which could cave

in. Specific requirements for shoring or sloping trench walls

are available from several sources including Federal and State

O.S.H.A. offices, and appropriate governing agency. Be sure to

contact suitable authorities for these requirements before

working in a trench. Federal O.S.H.A. regulations can be

obtained by contacting the Superintendent of Documents, U.S.

Government Printing Office, Washington, D.C. 20402. State

O.S.H.A. regulations are available at your local state O.S.H.A.

office, and appropriate governing agency.

Check laws and regulationsKnow and obey all Federal, State, and Local, and appropriate

governing agency laws and regulations that apply to your work

situation.

Place warning barriers around work siteSet up orange cones around the work area with warning signs

facing outward.

Place pedestrian and traffic barriers around the job site in

accordance with Federal, State, and Local, and appropriate

governing agency laws and regulations.

Observe environmentalprotection regulationsBe mindful of the environment and ecology.

Before draining any fluids, find the correct way of disposing

them.

Observe the relevant environmental protection regulations

when disposing of oil, fuel, coolant, brake fluid, filters and

batteries.

When using any solvent to clean parts, make sure that it is

nonflammable, that it will not harm the skin, that it meets

current O.S.H.A. standards, and appropriate governing agency,

and that it is used in an area that is adequately ventilated.

WARNING

nFailure to follow any of the above safety instructions

or those that follow within this manual, could result

in serious injury or death. This DTH is to be used

only for those purposes for which it was intended as

explained in this instruction manual.

Avoid electrocution, stay awayElectrocution possible. Serious injury or death may result if the

machine strikes an energized powerline. Take the following

precautions to prevent electrocution. Also refer to the operating

instructions.

nAlways contact your local utility company when working in

the vicinity of utilities.

nLocate underground utilities by qualified persons.

nDo not raise, lower, or move drill guide or boom near power

lines.

nAlways wear proper electrically insulated linemans gloves

and boots.

nNever touch metal parts on machine while standing on bare

ground if machine comes in contact with a powerline.

nAlways stay in cab during all drilling operations.

nNever step onto or off of a machine if an electric strike

occurs.

Loose partsMake sure the drill rod to rotary head spindle joint is securely

tightened before running the rotary head in reverse rotation.

A loose connection could result in the drill rod unscrewing

completely; a falling drill rod could strike personnel.

Live airNever get under a downhole drill to examine the exhaust air;

live air is dangerous. Also, part failure could cause the bit to fall

out of the downhole drill which could result in bodily injury. A

piece of cardboard can be inserted under the bit to check

for the lubrication being carried through the downhole drill.

Air pressureMake certain that the air line lubricator (or lubrication system) is

capable of handling the higher air pressures associated with the

downhole drill (up to 30 bar (430 psi) air pressure). When

pressurized, an unsuitable lubricator could burst and possibly

cause injury to personnel in the area.


7/20



Raise the tube/backhead assembly a few inches off the

wood block, and drop the assembly back onto the block.

The collection tube assembly will separate from the

backhead assembly.

Method 2 Bit and Chuck have been removed from hammer.

Using a brass bar, gently tap against the bottom end of the

collection tube until it is loose.

Remove the collection tube from the backhead end.

Method 3 Backhead and collection tube assemblyhave been removed as one unit.

Place the bottom end of the collection tube/backhead

assembly on a large block of wood.



Disassembly

The following disassembly procedure starts with the

presumption that the chuck and backhead threads have been

loosened.

Its important to note that the piston can only be removedfrom the chuck end of the drill.

1. Unscrew the backhead assembly from the casing. Thisremoves the backhead, check valve, adapter, collection tube

and valve assembly.

2. Remove the valve assembly from the backhead and

collection tube pilot diameters.

3. Use the weight of the backhead assembly to jar the

collection tube free from the backhead.

4. Remove the adapter tube from the collection tube. Be sure

to remove the crush ring that is within the base of the

collection tube bore.

5. Inspect the bottom end of the collection tube for wear on the

ID. The ID of the tube is 32 mm when new.



6. Pull the cylinder from the casing by gripping the valve

seat lip on the ID of the cylinder.

7. Unscrew the bit (not shown), chuck, chuck sleeve and bit

retainers from the casing.

8. Drop the casing from about 12-18 inches (300-450 mm)

onto a piece of wood to the jar the bearing loose. There

is a friction o-ring on the bearing that prevents it from

falling out when changing bits. The impact of the piston

on the bearing unseats this o-ring when the casing is

dropped.

9. Lay the casing on its side and remove the bearing.

10. Drop the casing again to unseat the piston ring. Pull the

piston stop ring from the casing.

11. Remove the piston from the casing by inserting a

broomstick with a rag wrapped around its end into the

piston bore.

12. Inspect the tail seal for damage. Pry out of bore and replaceif needed.



DTH inspection

The following lists critical measurements which are required

to determine what parts, if any, require replacements or

repair. Refer to the section 4 (specifications) for finding the

appropriate discard point clearances. Bear in mind that discard

point clearances represent an increase in clearance of 50%

over the maximum as-new clearance. In some applications this

clearance increase may represent too much performance loss

and in other applications the opposite may be true.

Note that deterioration in drill performance is caused by the

increase in clearance between two parts. It is obviously more

cost effective to replace the part which decreases clearance

the most at the lowest cost. Figure 66 of sections 5 tabulates

all the minimum material condition diameter as new from

which the wear on each part can be judged. This data should

be used to determine which part(s) should be replaces when

the net clearnase is beoynd the discard point.

Since the RC 50 is a Reverse Circulation hammer, there is

normally little or no wear on the outside diameter of the

hammer case. In formations subjected to wear from being

stucked in a hole min. 5.00 in (125 mm) should be used as

wear limit.

1. Measure valve lift by recording lip of valve to backhead space

and subtracting the dimension from the cylinder to valve

seat dimension. (Note: be sure that valve is pressing against

backhead.)

2. Measure cylinder bore using a dial bore gage. Measure in a

location between slots and small holes.

3. Measure casing bore using a dial bore gage. Measue in a

location approxiamately 16 in. (406 mm) from the chuck end.

4. Measure piston ODs in three places.

5. Measure bearing ID.



DTH assembly

The DTH assembly process is identical to the disassembly

process yet in reverse. The following guidelines should be

used:

nAll parts should be clean and free of grit dirt and other

foreign material.

nAll nicks and burs on parts should have been removed.

nAll parts should be coated with rock drill oil and preferablythe same type to be used on the drilling rig.

nAll damaged o-rings should have been replaced. All seals

should be oiled or greased to avoid cutting or tearing.

nIf corrosion is common it may be useful to spray the threads

on the casing with a corrosion protector such as LPS

Hardcoat or an equivalent. Make sure the threads are clean

and dry and sufficient drying time is allowed.

1. Oil the piston liberally with rock drill oil and insert piston into

casing with the small diameter end on the chuck end of the

casing.

2. Insert the bearing stop ring sideways and turn to lock in itsgroove when it is positioned near its groove. The ring will

produce and audible snap when it snaps into its groove.

Sometimes the bearing is useful for seating the bearing snap

ring. The ring will be 10 in. (254 mm) from the casing end

when seated properly.

3. Insert the bearing into the casing until it stops against the

bearing stop ring.

4. A brass (or soft steel) bar is useful for seating the bearing.

5. Attach bit retaining rings to the bit, chuck and chuck sleeve

assembly.

6. Insert and screw the bit-chuck assembly into the casing.



7. Seat collection and adapter tube assembly into backhead.

8. Install valve assembly on backhead and collection tube pilot

diameters.

9. Install cylinder. Make sure the end with the elongated holes

is inserted first.

10. Screw backhead assembly into casing and verify that

standoff is between .020 and .040 in (0.5 and 1.0 mm)

using feeler gages. Review and replace worn parts if gap

is less than .020 in (0.5 mm). Review assembly for dirt or

contamination if gap is greater than .040 in (1.0 mm).


14/20



Secoroc RC 50 Std 52347630Specifications Secoroc RC 50 Solid 52348158 4-1/2 REMET (box connection)Physical Data English Metric

Outside diameter (in & mm) 5.13 130

Length w/o bit shoulder to shoulder (in & mm) 45.4 1152

Length with bit extended (in & mm) 50.2 1276

Length with bit retracted (in & mm) 48.5 1232

Weight w/o bit (lb & kg) 158 72

Backhead across flats 4 in. A/F

Minimum bit size (in & mm) 5.5 140

Maximum bit size (in & mm) 6.00 152

Bore (in & mm) 4.476 113.7

Piston weight (lb & kg) 38 17

Stroke (in & mm) 2.50 64

Maximum pressure differential (psig & bar) 500.0 35

Maximum choke diameter (in & mm) n/a n/a

Make-up torque (ft-lb & Nm) 5000 6770

Performance Data200 psi/14 bar (scfm & l/s) 380 180

200 psi (bpm) 1,750

250 psi/17 bar (scfm & l/s) 460 220

250 psi (bpm) 1,900

300 psi/21 bar (scfm & l/s) 580 270

300 psi (bpm) 2,100

350 psi/24 bar (scfm & l/s) 700 330

350 psi (bpm) 2,250

400 psi/28 bar(scfm & l/s) 820 390

400 psi (bpm) 2,350

450 psi/31 bar (scfm & l/s) 930 440

450 psi (bpm) 2,450

500 psi/35 bar (scfm & l/s) 1,050 500

500 psi (bpm) 2,550

Secoroc RC 50 Std 52347630Specifications Secoroc RC 50 Solid 52348158 4-1/2 REMET (box connection)Operational Data English Metric

Casing discard diameter (in & mm) 5.00 127

Casing reverse diameter (in & mm) n/a n/a

Max. worn piston to casing clearance (in & mm) 0.012 0.3

Max. worn piston to cylinder clearance (in & mm) 0.013 0.3

Max. worn piston to bearing clearance (in & mm) 0.018 0.5

Min. piston stem O. D. (in & mm) 3.433 87.2

Min. new valve height, low lift valve (in & mm) 0.53 13.5

Valve lift new, low lift valve or s/shim (in & mm) 0.05 0.5- -0.8

Max. backhead standoff 0.04 1

Min. backhead standoff 0.02 0.5

Figure 3. Physical Specifications

Figure 4. Maintenance Specifications



Parts list

Product No. Part description Product code Ref No. Qty

per

52347630 DRILL/RC 50-STD 9705-52-63-00

52348158 DRILL/RC 50-A140 (Australia) 9705-52-65-00

52291630 CYLINDER, RC 50 9705-00-63-00-048 7 1

52344074 VALVE ASSEMBLY, RC 50 9705-00-63-00-042 14 1

52291846 VALVE BODY Not shown 1

95137394 VALVE O-RING Not shown 1

95716833 VALVE O-RING Not shown 1

52291853 BIT BEARING,RC 50 9705-00-63-00-022 13 1

52344066 ASM,CENTER TUBE,RC 50

(W/BUMPER)

9705-00-63-00-120 10, 39, 32 1

52292000 STOP RING,CYLINDER, RC 50 9705-00-63-00-062 18 1

52292018 PISTON RC 50 9705-00-63-00-005 5 1

52292067 SEAL,PISTON TAIL, RC 50 9705-00-63-00-054 37 1

52292331 ASM,BIT RET RNG, RC 50 9705-00-63-00-002 12 152341898 CRUSH RING, RC 50 9705-00-63-00-014 9 1

52346590 ADAPT. TUBE, HOLES, RC 50 9705-00-63-00-094 11 1

52346616 SEAT, CK. VALVE, RC 50 9705-00-63-00-018 16 1

52346624 SPRING, CK. VALVE, RC 50 9705-00-63-00-016 15 1

52346632 RING, RET., CHECK VALVE 9705-00-63-00-028 3 1

52346715 SEAL, RC 50, POLYPACK 9705-00-63-00-036 36 1

52346723 DEBRIS SCREEN, RC 50 9705-00-63-00-012 6 1

52348638 CHECK VALVE ASSEMBLY (W/SPRING) 9705-00-63-00-017 8, 36, 15 1

52346780 RING, RET., BIT BEARING 9705-00-63-00-058 17 1

52347507 CHUCK, RC 50 9705-00-63-00-001 4 1

52291606 CHUCK SLEEVE, OD = 5.28 (134 mm) 9705-00-63-34-078

The Chuck Sleeve used

must correspond to the

diameter of the bit used







52348141 CHUCK SOLID 137MM OD

(Australia only)

9705-00-65-37-001 4 (no shroud

needed)

0

52347648 BACKHEAD, RC 50 9705-52-63-00-020 1 1

52347655 HAMMER CASING, RC 50 9705-00-63-00-004 2 1

95018453 O-RING, 20A11CM226 0663-95018453 30 2

95018701 O-RING, 20A11CM227 0663-95018701 33 1

95086153 O-RING, 20A11CM129 0663-95086153 34 1

95086591 O-RING,20A11CM233 0663-95086591 31 1

95086641 O-RING, 20A11CM242 0663-95086641 35 2

95086666 O-RING,20A11CM244 0663-95086666 38 1

95086195 ORING, 20A11P9M134 0663-95086195 32 2

95136669 O-RING, 20A11P9M330 0663-95136669 39 1



Product No. Part description Product code

52348661 E-KIT SERVICE (O-RINGS, VALVE, CHECK

VALVE & EXTERNALS)

9705-00-63-00-040 4,1,2,14,37,30,33,34,32,

31,35,38,6,15,8,36

52348653 SERVICE KIT (SEAL KIT, VALVE ASSEMBLY,

CHECK VALVE ASSEMBLY)

9705-00-63-00-070 14,37,30,33,34,32,31,35

,38,6,15,8,36

52345147 SEAL KIT (TAIL SEAL AND ALL O-RINGS IN

HAMMER)

0663-52345147 37,30,33,34,32,31,35,38

52348182 ADAPTOR TUBE ASSEMBLY 9705-00-63-00-094 11,30,31,34

52348638 CHECK VALVE ASSEMBLY (WITH SPRING

AND POLY PACK)

9705-00-63-00-017 8, 36, 15

Kits and accessories

Product No. Part description Product code

Drop centre design

90516075 140 mm bit, RC 50 (5 1/2) 100-5140-97-7217,08-2090516132 146 mm bit, RC 50 (5 3/4) 100-5146-97-7217,08-20

90516133 152 mm bit, RC 50 (6) 100-5152-97-7217,08-20

90516134 165 mm bit, RC 50 (6 1/2) 100-5165-97-7217,08-20

Bits


18/20

RC 50


19/20


20/20

Atlas Copco Secoroc ABBox 521, SE-737 25 Fagersta, Sweden

Phone: +46 223 461 00E-mail: [email protected]

www.atlascopco.com

9852

1866

01

-RC5

0

2007.

12

9852 1866 01_RC 50 Technical Manual_LOWres

Documents

Transcript of 9852 1866 01_RC 50 Technical Manual_LOWres