Exh Eg 1826 h (No Comments)

Chevron Specification EXH-EG-1826-H

AIR COOLED HEAT EXCHANGERS

December 1989 of 11

SPECIFICATION EXH-EG-1826-HAIR COOLED HEAT EXCHANGERS



of 11 December 1989

CONTENTS

1.0 GENERAL............................................................................................................................3

2.0 PROPOSALS........................................................................................................................3

3.0 DOCUMENTATION ............................................................................................................3

4.0 GUARANTEE (EXCEPTION) .............................................................................................4

5.0 DESIGN...............................................................................................................................4

6.0 MATERIALS ........................................................................................................................7

7.0 FABRICATION ....................................................................................................................8

8.0 INSPECTION, EXAMINATION, AND TEST .....................................................................9

9.0 PREPARATION FOR SHIPMENT....................................................................................10

11.0 COMPANY REFERENCE DOCUMENTS (ADDITION) ..................................................11



December 1989 of 11

1.0 GENERAL

1.1 Scope

(Addition) This specification supplements the requirements of the latest edition of APIStandard 661 (referred to hereafter as API 661) and its Appendices. An accompanying datasheet for each unit describes further requirements for performance and construction.

1.1.1 Nomenclature.

• An exception, as noted, to an API paragraph deletes the entire API paragraph.• An addition, as noted, to an API paragraph expands the requirements or selects

options.• If an API 661 paragraph is not discussed, then its contents are accepted.

1.6 Conflicting Requirements

1.6.1 (Exception) In order of precedence, the unit shall conform to the following documents:

• Purchase Order/List Sheets• Air Cooled Exchanger Data Sheet (EXH-DS-1826)• This Specification• Referenced Specifications• Referenced Standard Drawings• API 661, Air Cooled Heat Exchangers for General Refinery Services

2.0 PROPOSALS

2.2.1 (Exception) The Vendor's proposal shall include a completed data sheet,EXH-DS-1826 for each unit.

2.2.8 (Exception) The proposal shall include a completed noise data sheet, NCM-EF-594.

3.0 DOCUMENTATION

3.1 Approval Information

3.1.1 (Addition) In addition to the items listed in Paragraph 3.1.1 of API 661, Vendor shallinclude the following information on the outline drawings.



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14. Cross-section drawings of all major components and tube bundle detailssufficiently complete so that Company can fabricate and assemble areplacement bundle.

3.1.2 (Addition) Vendor shall not start fabrication until Company has approved preliminaryor final shop drawings submitted in accordance with Paragraph 3.1.1.

3.1.4 (Addition) All proposed welding procedures and qualifications shall be submitted forapproval prior to start of fabrication.

3.2 Final Records

3.2.1 Information Required Prior to Shipment

2. (Addition) Report separately in the manufacturer's data report any thicknessofsteel in the header that is in excess of required minimum thickness, plusspecified corrosion allowance.

9. (Addition) A characteristic performance curve for the fans shall be furnished.

12. (Addition) Copies of certified test reports or certificates of compliancecovering pressure-containing material (except as excluded by CodeParagraph UG-11) and any low and high alloy material used for internals.

4.0 GUARANTEE (EXCEPTION)

Vendor shall guarantee each unit in accordance with GAM-EG-3042.

5.0 DESIGN

5.1.6 Headers - Removal Cover Plate and Removable Bonnet Type

5.1.6.7 (Addition) Stud closures in lieu of through-bolting are not permitted.

5.1.9 Gaskets

5.1.9.2 (Addition) Where compressed asbestos gaskets are used or where gaskets arenot confined, 450°F shall be given as maximum allowable temperature.

5.1.10 Nozzles and Other Connections



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5.1.10.1(Addition) Inlet/Outlet nozzles shall be flanged 2-inch NPS or larger.

5.1.10.4(Addition) Cast transition nozzles are acceptable only when specificallyapproved by Company.

5.1.10.8 and 5.1.10.9 (Addition) Nozzles of each unit shall be equipped with atemperature and pressure connection.

5.1.12.7(Addition) The fin types listed in Paragraph 5.1.12.7 of API 661 shall havethe following temperature limits:

Maximum InletType of Fin Fluid Temperature

1. Embedded 750°F2. Integral 550°F3. Overlapped Footed 250°F4. Footed 250°F

5.2 Air-Side Design

5.2.2 Noise Control

5.2.2.1 (Exception) The Vendor's base proposal shall include his standard soundlevel control features, if any. Unless otherwise specified, maximum soundpressure levels at any location 3 feet from any air cooler surface shall notexceed 85 dBA.

For the basic offering, the Vendor shall furnish the guaranteed A-weightedsound pressure level at 3 feet from the unit. If the sound pressure level of thebasic offering exceeds 85 dBA, the Vendor shall separately quote specialdesigns and/or acoustic treatment that would be required for the Vendor toguarantee 85 dBA. Details of specific designs and/or acoustic treatment shallbe furnished with the proposal.

5.2.3 Fans and Fan Hubs

5.2.3.5 (Exception) Fan tip speed shall not exceed 10,000 fpm.

5.2.5 Lubrication Facilities

5.2.5.1 (Addition) Length of lines supplying grease to bearings shall be held to theminimum consistent with good accessibility.



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5.2.5.2 (Addition) Gear box oil level shall be capable of being checked and oil addedif necessary without hazardous exposure of the operator or shutdown of theequipment.

5.2.8 Electric Motor Drivers (Exception) Electric Motors shall be furnished in accordancewith Specification DRI-EG-1824.

5.2.11 Belt Drives

5.2.11.1 (Exception) Belt drives shall be Uniroyal High Torque Drive (HTD)synchronous belts and pulleys or Company-approved equivalent.

5.2.11.9 (Exception) HTD synchronous belts shall have a minimum service factorof 2.2 for fixed speed drivers and a minimum service factor of 2.4 fortwo speed drivers, based on driver-rated brake horsepower.

5.2.12 Gear Drives (Addition) All gear selection is subject to the Company's specificreview and approval.

5.2.14 Vibration Cutout Switches

5.2.14.1 (Addition) Units shall be furnished with vibration shutdown devices(Robertshaw Vibraswitch or equal approved by Company) suitable forClass 1, Division 2 location. The placement and orientation of thesensor shall be determined by the Vendor and shall be a point which isknown to the Vendor to vibrate with sufficient amplitude to activate theshutdown whenever the machine becomes unbalanced.

5.3 Structural Design

5.3.2 Structural Design Loads and Forces

4. (Addition) Air cooled heat exchangers must be structurally and thermallydesigned to accept maximum fluid inlet temperature throughout the coolingcoils during power failure conditions without warping or pulling of tubes orany other mechanical damage or any leakage of the fluid in the tubes.

5.3.4 Access Facilities

5.3.4.1 (Addition) Full platform access to fan motors, gears, vibration shutdownswitches, and piping flanges is required. Where plug access is the onlymaintenance requirement, permanent supports for temporary scaffolding areacceptable.



December 1989 of 11

5.3.4.3 (Addition) Grating is acceptable material for use as floor plates.

5.3.4.5 (Addition) Ladders, cages, and guards shall be designed in accordance withStandard Drawings GD-M13909, GF-M88575, and GF-M99645.

6.0 MATERIALS

6.1 General Requirements. (Addition) Materials shall comply with requirements of Data SheetEXH-DS-1826.

6.1.1 (Addition) Tube material shall be specified as follows:

• Carbon Steel SA-179 or SA-192• Low-Alloy Steel SA-209 or SA-213• Austenitic Stainless Steel SA-213• Ferritic Stainless Steel SA-268

6.1.1.1 Tubes shall be seamless.

6.1.8 (Addition) Fan materials, construction, and maximum diameter shall be as follows:

MaximumAcceptable Materials and Construction Fan Diameter

a. One piece cast aluminum blades. 12 feetMarley is an acceptable supplier.

b. Aluminum blades, extruded or fabricated 18 feetfrom sheet metal, with either cast,wrought, or fabricated shanks. ChittomEquipment Co. and The Moore Co. areacceptable suppliers.

c. Chrome-nickel stainless steel, Type 304 18 feet

d. Reinforced Plastic. Hudson Products Co. 18 feet is anacceptable supplier.

6.1.8.1 (Addition) Copper content of aluminum blades shall not exceed 0.4% toexclude aluminum alloys with poor corrosion resistance.



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6.1.8.3 (Addition) All components of the fan assembly including the nonmetallicparts such as plastic fan blades, blade mounting bushings, variable pitchcontrols shall meet the following conditions:

1. Fans in induced draft service may be shut down for extended periods,and will then be subjected to the inlet temperature of the fluid beingcooled. They shall be suitable to be re-started from this condition.

2. During turnaround, the cooling coils will be subject to steam flow ata temperature specified by the Company. The fans will not beoperated during or immediately following this period. Fans and othercomponents above the bundle in induced draft services will be subjectedto the saturation temperature of the steam.

3. For air cooled heat exchangers with provisions for air recirculation, dueconsideration shall be given to the temperature to which the fans may besubjected during abnormal operation.

7.0 FABRICATION

7.1 Welding

7.1.1 General

7.1.1.5 (Addition) Weld rod or wire shall be selected to ensure that the depositedweld metal in the finished header will not exceed 100,000 psi tensile strength.This shall be verified by hardness testing in accordance with Section 8.2.13.

7.2 Postweld Heat Treatment

7.2.1 (Addition) Carbon steel shall receive a postweld heat treatment when required byCode or when specified by the Company.

Preheat and postweld heat treatment requirements for carbon steel shall be as follows:

Thickness and Minimum Postweld Heat TreatmentPreheat Temperature Temperature Holding Time

To 1-1/2 in.: 70°F 1100-1200°F Per CodeOver 1-1/2 in.: 250°F



December 1989 of 11

8.0 INSPECTION, EXAMINATION, AND TEST

8.2 Quality Control

8.2.2.1 (Addition) Fine grain, high definition, high contrast film (Kodak Type AA orequivalent brands) shall be used. Fluorescent intensifying screens shall notbe used.

8.2.3 (Addition) Company shall be notified sufficiently in advance so that it may designatethe locations at which the spot radiographs shall be taken.

8.2.13 Hardness Examination

The following are additions or exceptions to the items listed in Paragraph 8.2.13 ofAPI 661.

1. (Addition) Hardness readings need not be taken on a carbon steel header ifdemonstrated to Company that it is welded with a brand of rod or wire whichhas been proven to have an acceptable maximum hardness.

2. (Addition) Tests shall be made with a Telebrineller or Bitzen hardness tester.

3. (Addition) Tests shall be made after any required postweld heat treatmentand before hydrostatic testing.

4. (Exception) Any carbon steel joint with a hardness over 200 Brinell or low-alloy joint with a hardness over 215 Brinell shall be rejected.

5. (Exception) Hardness shall be verified by one spot hardness test of weldmetal oneach circumferential and each longitudinal joint.

6. (Addition) Proposed corrections to lower hardness of rejected joints shall besubmitted in writing to Company for approval.

8.3 Pressure Tests

8.3.1 (Addition) The tube side shall be hydrostatic tested to 1-1/2 times the maximumallowable pressure at the test temperature calculated for the nominal thickness asconstructed in accordance with Code Paragraph UG-99(b).

8.3.3 (Addition) The minimum fluid temperature for hydrostatic testing shall be higher thanthe Minimum Pressurizing Temperature listed on the Data Sheet EXH-DS-1826.

8.3.7 (Addition) Normal service gaskets shall be used for all hydrostatic tests.



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8.3.8 (Addition) The purchaser's inspector shall witness the final required tests asdescribed above.

8.4 (Addition) Shop Run In

A shop run of the completely assembled exchanger is required. The Purchaser's inspectorshall witness this test.

8.5 Nameplate

8.5.3 (Addition) In addition to the data required by the Code and API 661, the nameplateshall give the following information:

a. Maximum allowable working pressureb. Maximum allowable temperaturec. Company's order numberd. Stamp of Company's inspector

9.0 PREPARATION FOR SHIPMENT

9.1 General

9.1.4 (Exception) Company will specify coating system to be used and surface preparationrequirements. Vendor may submit alternate coating proposals for Company reviewand approval.

9.1.5 (Addition) Connections equipped with permanent blind flanges or covers shall bebolted up with specified gaskets in place, ready for service. All other flange facesshall be protected by applying a stiff grease and bolting on wooden or steel coverswith at least four bolts.

Threaded connections on outside of heat exchanger shall be protected from damageby installing carbon steel bar stock plugs.

Tell-tale holes in reinforcing pads shall be plugged with stiff grease only.



December 1989 of 11

11.0 COMPANY REFERENCE DOCUMENTS (ADDITION)

The following drawings and specifications are referenced in and are part of this Specification:

• EXH-DS-1826• DRI-EG-404• DRI-EG-1824• GAM-EG-3042• NCM-EF-594• GD-M13909• GF-M88575• GF-M99645

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