Air Cooled Heat Exchangers Nao Spc d Ht 003

7/29/2019 Air Cooled Heat Exchangers Nao Spc d Ht 003

http://slidepdf.com/reader/full/air-cooled-heat-exchangers-nao-spc-d-ht-003 1/14

TALISMANE N E R G y

NAO ENGINEERING SPECIFICATIONS - HEAT TRANSFER

AIR COOLED HEAT EXCHANGERSNAO-SPC-D-HT-003

AIR COOLED HEATEXCHANGERS

Issue: 2011/01/01

Next Review Date:June 2011 Published by:

HSE/OI Staff Responsible: Talisman Energy Inc.Mechanical Technical Authority Operational Integrity Department

APPROVALS:Calgary

Tech Auth:Copyright is owned by Talisman Energy Inc. All

Eng. Auth: rights are hereby reserved. This document (inwhole or in part) may not be reproduced, stored in

VP-HSEOI:a retrieval system, or transmitted, in any form ormeans, without the prior written permission ofTalisman, or as expressly permitted by law.

Note: This is an existing specification currently being used by Talisman and has not beentechnically reviewed or signed off by the Technical Authority at this time. Over time, these

specifications will be rebuilt and validated through a specification review process. Pleaseensure that you use the most current copy of the specs listed on the NAO Portal underEngineering Specifications. The Technical Authority identified on the cover sheet is the point ofcontact for this specification.

Attention: Paper copies are uncontrolled. This copy is valid only at time of printing, 12/15/2010.The controlled document is available on the Talisman NAO Portal.



TALISMAN ENERGY INC. GENERAL SPECIFICATION

AIR COOLED HEAT EXCHANGERS Rev 2BI

Oct 20021 Page 1 of 12S1.C201

TABLE OF CONTENTS

1. SCOPE................................................................................................................................2

2. APPLICABLE REGULATIONS, CODES, STANDARDS, AND SPECIFICATIONS .............2

3. DRAWiNGS.........................................................................................................................3

4. DESiGN...............................................................................................................................3

5. DESIGN DATA....................................................................................................................4

6. MINIMUM THiCKNESS........................................................................................................5

7. RATING...............................................................................................................................5

8. MATERIALS...... ...... ....... .......... ................ ................ ...... .................. .... ...... ... ..... ....... .......... 5

9. HEADERS AND HEADER COVERS ...................................................................................6

10. TUBES.............................................................................................................................6

11. SUPPORTING STRUCTURES ........................................................................................ 7

12. CORROSION ALLOWANCE ...........................................................................................7

13. BOLTING.........................................................................................................................8

14. DRiVERS.............. ......... ...... ........... ..... .......... ...... .......... ......... ..... ............... ................ .....8

15. LUBRiCATION.................................................................................................................8

16. CONNECTIONS...............................................................................................................9

17. CONTROLS.....................................................................................................................9

18. MAINTENANCE AND HANDLING EQUIPMENT ............................................................10

19. FABRiCATION...............................................................................................................10

20. INSPECTION AND TESTING ........................................................................................12

21. PAINTING ......................................................................................................................12

22. PREPARATION FOR SHiPMENT..................................................................................12

N:I TALIS MANIS PECI TLM-ColtSpecíficalíonsIC201. DOC




AIR COOLED HEAT EXCHANGERSRev 2B

I

Oct 2002I Page 2 of 12S1.C201

1. SCOPE

1.1.1. This specification covers the design, manufacture, and testing of air-

cooled heat exchangers.

2. APPLICABLE REGULATIONS, CODES, STANDARDS, AND SPECIFICATIONS

2.1. TLM General Specifications

2.1.1. All air-cooled heat exchanges shall be designed, manufactured, and

tested in accordance with this specification. The following TLM andColt Engineering Corporation (Prime) specifications form part of this

specification:

. ES1.L 102 - Piping Fabrication, Erection and Testing

. ES 1.v1 01 - Unfired Pressure vessels

. ES1.Q102 - Reinforced Concrete

. ES1.Q105 - Structural Steel

. ES1.N101 - Electrical

. ES1.Z403 - Painting and Coatings

. ES1.Z404 - Insulation

Colt Specification:

· GS903.03 - General Specification Piping Materials - Line Classes,TLM Specific

. GS902.02 - General Specification Air Cooled Exchangers

2.2. Applicable Regulations, Codes and Standards

2.2.1. All air cooled heat exchangers shall comply with the latest editions of

the following:

2.2.2. The ASME Boiler and Pressure Vessel Code ASME VIII, Div 1

2.2.3. Tabular Exchanger Manufacturer Association (TEMA)"R" Standards

2.2.4. The exchanger is to be installed in accordance to the correspondingprovincial Boiler and Pressure Vessel Regulations.

2.2.5. CSA Standard B.51, Construction and Inspection of Boilers andPressure Vessels.

2.2.6. API Standard 661, Air Cooled Heat Exchangers for General Refinery

Services.

N:I TALIS MANISPE CITLM-ColtSpecíficalions\C201. DOC





Oct 2002I Page30f12S1.C201

2.3. Conflct Between Specification, Codes And Standards

2.3.1. Where a conflict occurs between this specification and anyspecification, regulation, code or standard which has been specified fora particular service or item of equipment, then TLM shall be consultedand a ruling in writing shall be obtained before any work is started.

2.3.2. Where regulatory codes or regulations conflict with this specification,the more rigid specification shall govern.

3. DRAWINGS

3.1.1. The manufacturer shall supply drawings in legible reproducible form,showing "as built" measurements of the finished vessel after

completion of all fabrication and heat treatment.

3.1.2. Drawings shall be supplied in electronic format, compatible to AutoCadlatest version release.

4. DESIGN

4.1. General

4.1.1. Coolers shall normally be of the forced draft type with a fan tip speed

not to exceed 12000 rpm.

4.1.2. The design air temperature is the dry bulb temperature, which isexceeded for 5% of the time during the four months of summer.

4.1.3. Where more than one fan is provided each fan shall be partitioned toprevent air circulation when one or more fans are idle.

4.1.4. Access to fans and drives shall be via hinged guards.

4.1.5. Plenum chambers not accessible through fan guards shall have hingeddoors.

4.1.6. A 3mm mesh insect screens in sections no larger than 2.4m x 1.2mshall protect cooler intake.

4.1.7. A hail guard shall protect cooler outlet.

4.1.8. Tension wound fins shall be attached to the tubes by zinc castings.

4.1.9. Tube bundles are not to exceed 4 rows deep without TLM's approvaL.

N:I TALIS MANIS PECITLM.CollSpecíficationslC20 1. DOC





I


4.1.10. Shaft and bearing grease points shall be accessible from ground levelwithout requiring entry in to plenum chambers.

4.1.11. Forced draft fan ground clearance shall exceed 80% of fan diameter.

4.1.12. Induced draft bundle ground clearance shall exceed 80% of fandiameter.

4.1.13. Plot layout shall not exceed two fan cells in width.

4.1.14. The estimated fan horsepower will include a 50% mark up for inductionlosses and fin side fouling and shall be based on the assumption thatfan static efficiency will be 40% or less.

5. DESIGN DATA

5.1.1. Detailed calculations of heat transfer, fouling factors and pressure

drops shall be provided to TLM for all coolers. The detailedcalculations shall include:

5.1.2. All physical properties with the data reference source, for all fluids;

5.1.3. Assumptions used;

5.1.4. Detailed calculations stating all equations used.

5.2. Design Pressure

5.2.1. The design pressure shall be a minimum of 10% or 172 kPa(whichever is greater) above the normal operating pressure.

5.2.2. The minimum design pressure shall be 241 kPa (g).

5.2.3. A cooler in vacuum service shall be designed for full vacuum.

5.2.4. Design pressure shall be set taking into account process upsets,

testing or unusual operating conditions.

5.3. Design Temperature

5.3.1. The design temperature of an exchanger shall be the normal operating

temperature plus 27°C, or the maximum operating temperaturewhichever is greater.

5.3.2. Consideration shall be given to high or low operating temperatures that

can result from process upset or plant start up and shutdown.

N:I TALIS MANIS PECITLM .CoIISpecificalions\C201. DOC






5.3.3. Cold service design temperatures shall be 6°C lower than the normal

operating temperature.

5.3.4. Low ambient air temperature conditions shall be considered in designof coolers and supporting structures.

6. MINIMUM THICKNESS

6.1. Tube Sheets

6.1.1. Tube sheets and plug sheets of plugs type headers shall have aminimum thickness of 22.2mm excluding corrosion allowance orcladding.

6.2. Cooler Headers

6.2.1. Cooler headers shall have a minimum thickness of 4.76mm excluding

corrosion allowance or cladding.

7. RATING

7.1.1.

8. MATERIALS

8.1. General

8.1.1.

8.1.2.

8.1.3.

8.1.4.

8.1.5.

8.2. Gaskets

8.2.1.

The cooler shall be rated for the design pressure and temperature.

Materials shall comply with ASME Code Section II.

Materials in contact with hydrogen must be approved, in writing, byTLM.

Admiralty shall be inhibited SB-III Type B, C or D; Type A is notacceptable.

Tube fins shall be aluminum alloy with minimal copper for sweet

service and no copper is permitted for sour service environments.

Cast iron and semi-steel components must be approved in writing, byTLM.

Gaskets for removable header covers shall be double-jacketed

asbestos unless otherwise approved in writing by TLM.

N:I T ALiSMANIS PECITLM-ColtS pecificationslC201. DOC





I


8.2.2. Gaskets for tube access plugs shall be solid metal or double-jacketed

asbestos.

8.3. Bolting

8.3.1. Bolting unless specified otherwise shall be in accordance with SA-193

Gr. B7 for temperatures for -28°C to 482°C and SA-193, Gr. B14 fortemperatures from -28°C to 5930C. Sour studs and bolts shall be A 19387M and nuts A 194 2HM.

8.3.2. Nuts shall be in accordance with SA-194 Gr. 2H.

8.4. Fan Blades

8.4.1. Fan blades shall be either of steel with a protective coating approved

by TLM or of aluminum series 5000.

8.4.2. Impact Requirements

8.4.3. All material shall meet the impact requirements of the applicable

portions of ASME Sections VIII and IX.

9. HEADERS AND HEADER COVERS

9.1.1. One header shall be the floating type.

9.1.2. Headers and covers shall be rolled or forged plate.

9.1.3. Headers shall be the plug type with a plug opposite the ends of each

tube.

9.1.4. Removable cover plates shall be provided in high fouling service.

9.1.5. Split headers shall be used when the temperature differential acrossthe bundles of multi-pass tubes may cause tube sheet warping.

9.1.6. Pass arrangements and nozzle location shall be designed for ease ofpiping.

9.1.7. When provided, cover plates shall be removable without disturbingheader-piping connections.

9.1.8. Tube plugs shall be the shoulder type with a straight shank.

10. TUBES

10.1.1. All tubes shall be seamless.

NI TALIS MANIS PECI TLM-CoIISpecìficationsIC201. DOC






10.1.2. A square or rectangular pitch is acceptable.

10.1.3. Tube sheets shall be rolled or forged.

10.1.4. Tube bundles shall be designed to be handled as a complete unit andadequately supported to prevent sagging or damage to fins.

10.1.5. Single-pass coils shall be sloped for drainage and each sectionprovided with a vent and drain connection.

10.1.6. Minimum tube thickness shall be 25.4mm outside diameter. Larger sizetubes may be used for viscous fluids and low-pressure gas.

11. SUPPORTING STRUCTURES

11.1.1. All steel work shall be in accordance with TLM ES1.Q105 StructuralSteel.

11.1.2. The anchor bolts shall be in accordance with TLM ES1.Q102

Reinforced Concrete.

11.1.3. Fan guards shall be provided and shall comply to applicable safetystandards.

11.1.4. Header platforms and stairs when specified shall be provided inaccordance with TLM ES1.Q105.

12. CORROSION ALLOWANCE

12.1.1. Unless otherwise specified a minimum corrosion allowance of 1.6mm

shall be included in the gross metal thickness of headers constructedof carbon steel. The corresponding Piping Material - Line Class

specification (Colt GS 903.03, TLM specific) corrosion allowance shallbe used when piping class corrosion allowance exceeds the minimumcorrosion allowance stated above

12.1.2. A minimum corrosion allowance of 1.6mm shall be included in the grossmetal thickness of headers constructed of alloys.

12.1.3. A corrosion allowance shall not be added to the base metal of headers

with alloy cladding on a mild steel base.

12.1.4. The full corrosion allowance shall be added to the base metal wherecarbon steel plate is protected by strip lining or other applied protectivecoatings.

N:I TALIS MANIS PECI TLM-ColtS pecificalionslC20 1. DOC





I


12.1.5. The corrosion allowance on internal partition plates of stiffeners shallbe included on each side exposed to process flow.

12.1.6. Using tubes two-gauge thickness heavier than the calculated thicknessshall provide a corrosion allowance for carbon steel or stainless steeltubes.

13. BOLTING

13.1.1. Flange head covers shall be bolted with stud bolts with a minimumdiameter of 15.8mm threaded full length.

13.1.2. Jackscrews shall be provided for breaking the head cover gasket joint,which shall be of the confined type.

14. DRIVERS

14.1.1. Electric motor drives shall be in accordance with ES1.N1 01.

14.1.2. Drivers shall be sized for design air quantity at minimum air

temperature.

14.1.3. Drivers for adjustable pitch fans shall be sized to operate at theminimum air temperature specified with the blade pitch set foroperation at the design air temperature.

14.1.4. V-belt drive assemblies may not be used with motors of more than 40

HP output to drive the fan. V-belts shall be static free.

14.1.5. Right angle gear drivers shall be used for driver of more than 40 HPoutput to drive the fan. They shall be of the spiral bevel type with aservice factor of 1.5 AGMA 430.

14.1.6. In rating the motor consideration shall be given to the ambient

temperature during operation with air recirculation if the motor isinstalled in the cooler.

14.1.7. Vertically mounted electric drivers shall be provided with covers for

protection.

15. LUBRICATION

15.1.1. The use of oil-less bearings, sealed hubs or remote lubrication facilitiesis preferred.

N:I TALIS MANIS PE CI TLM .CoIISpecificationsIC201. DOC





I


15.1.2. Connections shall be provided to permit lubrication without shuttingdown the cooler.

16. CONNECTIONS

16.1.1. Nozzle connections shall have a minimum wall thickness equivalent toextra strong pipe.

16.1.2. Nozzles 2 NPS nominal pipe size and larger shall be seamless longwelding neck flanges or pipe with welding neck flanges.

16.1.3. Connections 1 % NPS nominal pipe size and smaller shall be threaded,except where flanged instrument connections are specified, and shallbe at least equivalent to 6000 psi forged steel couplings or half

couplings.

16.1.4. In sour service application (TLM ES 1.A408) no threaded connection

are allowed. One and a half inch NPS connections and greater shallbe flanged in accordance to corresponding piping class specification.

16.1.5. Connections of % NPS or less, 1-1/2,2-1/2,3-1/2 and 5 NPS are notacceptable.

17. CONTROLS

17.1.1. Air flow shall be controlled by louvres which are automatically actuated

by temperature controllers with filled systems in accordance with thefollowing:

17.1.2. Automatically activated top louvres shall be controlled by product

temperature leaving the cooler.

17.1.3. When handling fluids that may freeze or hydrate the cooler the unitshall be enclosed and provided with recirculation plenum chamber withcontrol or air temperature to the coils. All louvres shall be

automatically controlled. Air temperature shall control the side louvresand recirculation louvres. Product temperatures shall control the toplouvres.

17.1.4. In non-freezing service, the top louvres shall be automatically

controlled. When process considerations require that the producttemperature be maintained above a minimum, the cooler may beequipped with manually controlled side louvres.

17.1.5. Manually controlled variable pitch fan blades shall be provided.

N:I T ALiSMANIS PE CI TLM -ColtSpecificationslC20 1. DOC





I


17.1.6. When handling fluids that may freeze, gel or congeal, provision shallbe made to prevent freezing during a shutdown. Such protection maybe supplied by means of steam or other heating coils located belowthe cooler coils, comprising finned 1 NPS tube on a maximum pitch of12 NPS. Steel piping and coils shall be completely drainable withvalve.

18. MAINTENANCE AND HANDLING EQUIPMENT

18.1.1. Lifting lugs shall be provided on removable cover plates and tubebundle headers.

19. FABRICATION

19.1. Welding

19.1.1. The welding procedure to be used in the fabrication of coolers shall besubmitted to TLM for approval before work is commenced on thecooler. For vessels fabricated from Class P-I materials, the weldingprocedures submitted to TLM shall include the Brinell hardness of thedeposited weld metal, using the actual filler materials and fluxes to beused in the vesseL. Satisfactory evidence shall be submitted that thewelding procedure has been qualified as required by the ASME Codeand by the Provincial Authorities of the province where the cooler is tobe installed.

19.1.2. All main longitudinal and end closure joints shall be full penetrationdouble welded butt joints or the equivalent.

19.1.3. Seal welds of partition plates and stiffeners shall not interfere with tubeflow characteristics or entry to the tube holes.

19.1.4. Single pass submerged arc welds are not acceptable.

19.1.5. Welds shall be ground to a smooth contour where dye penetrantinspection is required.

19.1.6. Horizontal partition plates of plug type headers shall be seal welded full

length along the two joints and preferably from both sides. The platesshall preferably be seal welded to the end Closure plate.

19.1.7. Partition plates or stiffeners of removable cover plate headers shall bewelded full length along three sides and also from both sides.

19.1.8. Where tubes are to be rolled, automatic type tube expanders shall beused to ensure adequate consistent rolling and prevent over rolling andenlargement of the tube sheet diameter.

NIT ALiS MANIS PECITLM-ColtSpecificalionslC201 . DOC





I


19.1.9. Tubes shall be rolled into the tubesheet for a length no less that 60mm,or tubesheet thickness minus 1.6mm, whichever is smaller. The

expanded portion shall not extend beyond the airside face of thetubesheet.

19.1.10.Where the tubesheets are thicker than SOmm and/or the tubes arelarger that 25mm diameter, the rolling procedure shall be submitted toTLM for approval.

19.1.11.Monel tube bundles in hydrofluoric acid service shall be seal welded.

19.1.12.Where tubes are specified to be seal welded, they shall be rolled, sealwelded and then lightly re-rolled.

19.1.13.Welded tube joints are not acceptable unless approved in writing by

TLM.

19.1.14.Gasket contact faces shall be machined and free of surface scale.The use of grease to install gaskets is not acceptable.

19.1.15.The hardness of welds in vessels fabricated from class P-1 materialsshall not exceed 200 BHN.

19.2. Stress Relieving

19.2.1. Heat treatment procedures for any cooler with any alloy lining shall beapproved in writing by TLM.

19.2.2. Carbon steel cooler components in caustic service shall be stressrelieved.

19.2.3. Fabricated and/or forged steel headers after completion of all weldingshall be stress relieved.

19.2.4. The hardness of alloy welds classified under AWS P-3, and P-5 shallnot exceed 225 BHN after heat treatment.

19.3. Tolerances

19.3.1. Where two or more coolers (having interconnecting nozzles) are to be

stacked they shall be set up in the shop and checked out for nozzlematch and the gasket faces of mating flanges shall not be out ofparallel by more than O.Smm. Bolts between connecting nozzles andstacked bundles shall be removable without moving the bundle.

19.3.2. Tubes shall project through the header tube sheets 1.6mm.

19.3.3. Tube sheet faces shall be true planes within O.Smm across the face ofthe tube sheet after tube rolling.

N:I TALIS MANIS PECITLM -ColtSpecificationsIC201. DOC




AIR COOLED HEAT EXCHANGERSRev 28

I


20. INSPECTION AND TESTING

20.1.1. Inspection and testing shall be in accordance with applicable sectionsof TEMA "R" and ASME Section VIII.

20.1.2. Fans shall be statically balanced.

20.1.3. No holes shall be drilled in tubes to assist in finning.

20.1.4. Fins damaged in assembly or erection shall be repaired.

21. PAINTING

21.1.1. Painting shall be in accordance with ES1.Z403.

22. PREPARATION FOR SHIPMENT

22.1.1. All parts shall be properly marked and conditioned for shipment andthoroughly cleaned of loose scale, dirt and other foreign material beforeshipment.

22.1.2. All liquids used for cleaning or hydrostatic testing shall be completelydrained from all units before shipment.

22.1.3. Machined surfaces, which will be exposed to the atmosphere in transitand subsequent storage, shall be properly protected with an easily

removable rust preventive coating of the proper consistency. Otherthan this coating, no painting or oiling shall be done unless specified.

22.1.4. A complete spare set of marked gaskets shall be supplied with eachcooler having removable header covers.

22.1.5. Wooden cover plates shall protect exposed bolted connections andthreaded connections shall be protected by steel plugs or caps.

22.1.6. Each cooler and any separate parts shall be properly protected toprevent damage during handling and shipment.

N:I T ALiSMANIS PE CI TLM-ColtSpecificatíonsIC201.DOC

Air Cooled Heat Exchangers Nao Spc d Ht 003

Documents

Transcript of Air Cooled Heat Exchangers Nao Spc d Ht 003