Petroleum, petrochemical and natural gas industries - Air-cooled heat exchangers (ISO 13706:2011)

ISO 13706:2011 gives requirements and recommendations for the design, materials, fabrication, inspection, testing and preparation for shipment of air-cooled heat exchangers for use in the petroleum, petrochemical and natural gas industries.
ISO 13706:2011 is applicable to air-cooled heat exchangers with horizontal bundles, but the basic concepts can also be applied to other configurations.

Erdöl- petrochemische und Erdgasindustrie - Luftgekühlte Wärmeaustauscher (ISO 13706:2011)

Industries du pétrole, de la pétrochimie et du gaz naturel - Échangeurs de chaleur refroidis à l'air (ISO 13706:2011)

L'ISO 13706:2011 spécifie les exigences et fournit des recommandations relatives à la conception, aux matériaux, à la fabrication, au contrôle, aux essais et à la préparation pour l'expédition des échangeurs thermiques aéroréfrigérants, destinés à l'utilisation dans les industries du pétrole, de la pétrochimie et du gaz naturel.
L'ISO 13706:2011 s'applique aux échangeurs thermiques aéroréfrigérants à faisceaux horizontaux, les concepts de base peuvent cependant s'appliquer aussi à d'autres configurations.

Petrokemična industrija ter industrija za predelavo nafte in zemeljskega plina - Zračno hlajeni prenosniki toplote (ISO 13706:2011)

Ta mednarodni standard podaja zahteve in priporočila v zvezi z načrtovanjem, materiali, izdelavo, nadzorom, pregledom ter pripravo za pošiljanje zračno hlajenih prenosnikov toplote, ki se uporabljajo v industriji za predelavo nafte in zemeljskega plina. Ta mednarodni standard se uporablja za zračno hlajene prenosnike toplote s horizontalnimi rebri, vendar se osnovni pojmi lahko uporabljajo tudi za druge izvedbe.

General Information

Status
Published
Publication Date
30-Nov-2011
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
10-May-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Erdöl- und Erdgasindustrien - Luftgekühlte Wärmeaustauscher (ISO 13706:2011)Industries du pétrole, de la pétrochimie et du gaz naturel - Échangeurs de chaleur refroidis à l'air (ISO 13706:2011)Petroleum, petrochemical and natural gas industries - Air-cooled heat exchangers (ISO 13706:2011)75.180.20Predelovalna opremaProcessing equipment71.120.30Prenosniki toploteHeat exchangersICS:Ta slovenski standard je istoveten z:EN ISO 13706:2011SIST EN ISO 13706:2012en,fr01-marec-2012SIST EN ISO 13706:2012SLOVENSKI

STANDARDSIST EN ISO 13706:20061DGRPHãþD
SIST EN ISO 13706:2012
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 13706

December 2011 ICS 27.060.30; 75.180.20 Supersedes EN ISO 13706:2005English Version

Petroleum, petrochemical and natural gas industries - Air-cooled heat exchangers (ISO 13706:2011)

Industries du pétrole, de la pétrochimie et du gaz naturel - Échangeurs de chaleur refroidis à l'air (ISO 13706:2011)

Erdöl- petrochemische und Erdgasindustrie - Luftgekühlte Wärmeaustauscher (ISO 13706:2011) This European Standard was approved by CEN on 26 November 2011.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 13706:2011: ESIST EN ISO 13706:2012

EN ISO 13706:2011 (E) 2 Contents Page Foreword ..............................................................................................................................................................3 SIST EN ISO 13706:2012

EN ISO 13706:2011 (E) 3 Foreword This document (EN ISO 13706:2011) has been prepared by Technical Committee ISO/TC 67 "Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries" in collaboration with Technical Committee CEN/TC 12 “Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries” the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 13706:2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 13706:2011 has been approved by CEN as a EN ISO 13706:2011 without any modification.

SIST EN ISO 13706:2012
SIST EN ISO 13706:2012
Reference numberISO 13706:2011(E)© ISO 2011

INTERNATIONAL STANDARD ISO13706Third edition2011-12-01Petroleum, petrochemical and natural gas industries — Air-cooled heat exchangersIndustries du pétrole, de la pétrochemie et du gaz naturel — Échangeurs de chaleur refroidis à l'air

SIST EN ISO 13706:2012
ISO 13706:2011(E)
COPYRIGHT PROTECTED DOCUMENT

ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56  CH-1211 Geneva 20 Tel.

+ 41 22 749 01 11 Fax
+ 41 22 749 09 47 E-mail
copyright@iso.org Web
www.iso.org Published in Switzerland
ii © ISO 2011 – All rights reserved
SIST EN ISO 13706:2012

ISO 13706:2011(E) © ISO 2011 – All rights reserved iii Contents Page Foreword ............................................................................................................................................................. v Introduction ........................................................................................................................................................ vi 1 Scope ...................................................................................................................................................... 1 2 Normative references ............................................................................................................................ 1 3 Terms and definitions ........................................................................................................................... 2 4 General ................................................................................................................................................... 5 5 Proposals ............................................................................................................................................... 6 6 Documentation ...................................................................................................................................... 7 6.1 Approval information ............................................................................................................................ 7 6.2 Final records .......................................................................................................................................... 8 7 Design ..................................................................................................................................................... 9 7.1 Tube bundle design ............................................................................................................................... 9 7.2 Air-side design ..................................................................................................................................... 22 7.3 Structural design ................................................................................................................................. 33 8 Materials ............................................................................................................................................... 38 8.1 General ................................................................................................................................................. 38 8.2 Requirements for carbon steel in sour or wet hydrogen sulfide service ...................................... 38 8.3 Headers ................................................................................................................................................ 38 8.4 Louvres ................................................................................................................................................. 38 8.5 Other components ............................................................................................................................... 39 9 Fabrication of tube bundle ................................................................................................................. 39 9.1 Welding ................................................................................................................................................. 39 9.2 Postweld heat treatment ..................................................................................................................... 40 9.3 Tube-to-tubesheet joints..................................................................................................................... 40 9.4 Gasket contact surfaces ..................................................................................................................... 41 9.5 Thread lubrication ............................................................................................................................... 41 9.6 Alignment and tolerances .................................................................................................................. 41 9.7 Assembly .............................................................................................................................................. 42 10 Inspection, examination and testing ................................................................................................. 43 10.1 Quality control ..................................................................................................................................... 43 10.2 Pressure test ........................................................................................................................................ 45 10.3 Shop run-in .......................................................................................................................................... 45 10.4 Equipment performance testing ........................................................................................................ 45 10.5 Nameplates .......................................................................................................................................... 45 11 Preparation for shipment .................................................................................................................... 45 11.1 General ................................................................................................................................................. 45 11.2 Surfaces and finishes ......................................................................................................................... 46 11.3 Identification and notification ............................................................................................................ 46 12 Supplemental requirements ............................................................................................................... 46 12.1 General ................................................................................................................................................. 46 12.2 Design ................................................................................................................................................... 46 12.3 Examination ......................................................................................................................................... 47 12.4 Testing .................................................................................................................................................. 48 Annex A (informative)

Recommended practices ........................................................................................... 49 Annex B (informative)

Checklist and data sheets ......................................................................................... 55 SIST EN ISO 13706:2012

ISO 13706:2011(E) iv © ISO 2011 – All rights reserved Annex C (informative)

Winterization of air-cooled heat exchangers ........................................................... 66 Annex D (informative)

Recommended procedure for airflow measurement of air-cooled heat exchangers ......................................................................................................................................... 117 Annex E (informative)

Measurement of noise from air-cooled heat exchangers ..................................... 124 Bibliography .................................................................................................................................................... 141

SIST EN ISO 13706:2012

ISO 13706:2011(E) © ISO 2011 – All rights reserved v Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 13706 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 6, Processing equipment and systems. This third edition cancels and replaces the second edition (ISO 13706:2005), which has been technically revised. SIST EN ISO 13706:2012

ISO 13706:2011(E) vi © ISO 2011 – All rights reserved Introduction It is necessary that users of this International Standard be aware that further or differing requirements can be needed for individual applications. This International Standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This can be particularly applicable where there is innovative or developing technology. Where an alternative is offered, it is the responsibility of the vendor to identify any variations from this International Standard and provide details.

SIST EN ISO 13706:2012

INTERNATIONAL STANDARD ISO 13706:2011(E) © ISO 2011 – All rights reserved 1 Petroleum, petrochemical and natural gas industries — Air-cooled heat exchangers 1 Scope This International Standard gives requirements and recommendations for the design, materials, fabrication, inspection, testing and preparation for shipment of air-cooled heat exchangers for use in the petroleum, petrochemical and natural gas industries. This International Standard is applicable to air-cooled heat exchangers with horizontal bundles, but the basic concepts can also be applied to other configurations. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 76, Rolling bearings — Static load ratings ISO 281, Rolling bearings — Dynamic load ratings and rating life ISO 286 (all parts), Geometrical product specifications (GPS) — ISO code system for tolerances on linear sizes ISO 1081, Belt drive — V-belts and V-ribbed belts, and corresponding grooved pulleys — Vocabulary ISO 1461, Hot-dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods ISO 2491, Thin parallel keys and their corresponding keyways (dimensions in millimetres) ISO 4183, Belt drives — Classical and narrow V-belts — Grooved pulleys (system based on datum width) ISO 4184, Belt drives — Classical and narrow V-belts — Lengths in datum system ISO 5287, Belt drives — Narrow V-belts for the automotive industry — Fatigue test ISO 5290, Belt drives — Grooved pulleys for joined narrow V-belts — Groove sections 9N/J, 15N/J and 25N/J (effective system) ISO 8501-1, Preparation of steel substrates before application of paints and related products — Visual assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates and of steel substrates after overall removal of previous coatings ISO 9563, Belt drives — Electrical conductivity of antistatic endless synchronous belts — Characteristics and test method ISO 15156 (all parts), Petroleum and natural gas industries — Materials for use in H2S-containing environments in oil and gas production SIST EN ISO 13706:2012

ISO 13706:2011(E) 2 © ISO 2011 – All rights reserved

AGMA 60011), Design and Selection of Components for Enclosed Gear Drives ANSI/AGMA 6010, Spur, Helical, Herringbone and Bevel Enclosed Drives ASME PTC 302), Air-Cooled Heat Exchangers ICC3), International Building Code NACE MR01034), Materials Resistant to Sulfide Stress Cracking in Corrosive Petroleum Refining Environments NACE SP0472, Methods and Controls to Prevent In-Service Environmental Cracking of Carbon Steel Weldments in Corrosive Petroleum Refining Environments 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 bank one or more items arranged in a continuous structure 3.2 bare tube surface total area of the outside surfaces of the tubes, based on the length measured between the outside faces of the header tubesheets 3.3 bay one or more tube bundles, serviced by two or more fans, including the structure, plenum and other attendant equipment NOTE Figure 1 shows typical bay arrangements. 3.4 critical process temperature temperature related to important physical properties of a process stream EXAMPLES Freezing point, pour point, cloud point, hydrate formation temperature and dew point. 3.5 cyclic service process operation with periodic variation in temperature, pressure, and/or flowrate 3.6 exhaust air air that is discharged from the air-cooled heat exchanger to the atmosphere 3.7 external recirculation process that uses an external duct to carry recirculated air to mix with and heat the inlet air 1) American Gear Manufacturers' Association, 1500 King Street, Suite 201, Alexandria, VA 22314, USA. 2)

American Society of Mechanical Engineers, Three Park Avenue, New York, NY 10016-5990, USA. 3) International Code Council Foundation, 10624 Indian Woods Drive, Cincinnati, OH 45242, USA. 4) NACE International, P.O. Box 218340, Houston, TX 77218-8340, USA. SIST EN ISO 13706:2012

ISO 13706:2011(E) © ISO 2011 – All rights reserved 3 3.8 finned surface total area of the outside surface exposed to air 3.9 forced-draught exchanger exchanger designed with the tube bundles located on the discharge side of the fan 3.10 geometric centre location at the centre of a bay on a plane midway between the air inlet and the air outlet for both forced-draft and induced-draft units NOTE The geometric centre is also considered the acoustic centre of a bay for calculations. 3.11 hydrogen service services that contain hydrogen at a partial pressure exceeding 700 kPa (100 psi) absolute 3.12 induced-draught exchanger exchanger designed with the tube bundles located on the suction side of the fan 3.13 inlet air atmospheric or ambient air that enters the air-cooled heat exchanger 3.14 internal recirculation process that uses fans (possibly with louvres) to recirculate air from one part of the process bundle to the other part 3.15 item one or more tube bundles for an individual service 3.16 item number purchaser's identification number for an item 3.17 measurement surface surface of the bay or the cylinder or sphere on which sound-pressure level is measured 3.18 minimum design air temperature specified inlet air temperature that is used for winterization 3.19 minimum design metal temperature lowest metal temperature at which pressure-containing elements can be subjected to design pressure 3.20 octave bands preferred frequency bands SIST EN ISO 13706:2012

ISO 13706:2011(E) 4 © ISO 2011 – All rights reserved 3.21 pressure design code recognized pressure vessel standard specified or agreed by the purchaser EXAMPLE ASME BPVC VIII. 3.22 recirculated air air that has passed through the process bundle and is redirected to mix with and heat the inlet air 3.23 specified minimum tube-wall temperature critical process temperature plus a safety margin 3.24 structural code recognized structural standard specified or agreed by the purchaser

EXAMPLES AISC M011 and AISC S302. 3.25 tube bundle assembly of headers, tubes and frames 3.26 seal-welded tube-to-tubesheet joint weld of unspecified strength applied between the tubes and tubesheets for the sole purpose of reducing the potential for leakage 3.27 sound level sound-pressure level when frequency is weighted according to the standardized A, B, or C weighting used in sound-level meters NOTE Only A-weighted readings [dB(A)] are referenced in this International Standard. 3.28 sound-power level ten times the logarithm to base 10 of the ratio of the total acoustic power radiated by a sound source to the reference power of 1012 W 3.29 sound-pressure level twenty times the logarithm to base 10 of the ratio of the root mean square sound pressure to the reference sound pressure of 2  105 N/m2 3.30 strength-welded tube-to-tubesheet joint welded so that the design strength is equal to, or greater than, the axial tube strength specified by the pressure design code 3.31 unit one or more tube bundles in one or more bays for an individual service 3.32 wind skirt vertical barrier either above or below an air-cooled heat exchanger that minimizes the effect of wind SIST EN ISO 13706:2012

ISO 13706:2011(E) © ISO 2011 – All rights reserved 5 3.33 winterization provision of design features, procedures, or systems for air-cooled heat exchangers to avoid problems with the process fluid as a result of low-temperature inlet air NOTE Problems related to low-temperature inlet air include fluid freezing, cooling to the pour point, wax formation, hydrate formation, laminar flow, and condensation at the dew point (which can initiate corrosion).

One-bay b)

Two-bay Key 1 tube bundle Figure 1 — Typical bay arrangements 4 General  4.1 The pressure design code shall be specified or agreed by the purchaser. Pressure components shall comply with the pressure design code and the supplemental requirements given in this International Standard. NOTE A bullet () at the beginning of a subclause indicates a requirement for the purchaser to make a decision or provide information (see checklist in Annex B). 4.2 The air-cooled heat exchanger shall be either a forced-draught exchanger or an induced-draught exchanger and shall include the components shown in Figure 2 and any auxiliaries such as ladders, walkways and platforms (see A.2). 4.3 Annex A, which may be consulted if required, includes for information some recommended mechanical and design details. Annex A also includes precautions for consideration when specifying certain design aspects, including temperature limitations, type of extended surface, tube support methods, type of air-cooled heat exchanger, materials of gasket construction and operational considerations such as walkway access. SIST EN ISO 13706:2012

ISO 13706:2011(E) 6 © ISO 2011 – All rights reserved  4.4 The vendor shall comply with the applicable local regulations specified by the purchaser. 4.5 In this International Standard, where practical, US Customary (USC) and other commonly used units are included in brackets for information.

Forced draught b)
Induced draught Key 1 tube bundle 2 header 3 nozzle 4 supporting column 5 plenum

6 fan 7 fan ring 8 fan deck 9 drive assembly 10 fan guard Figure 2 — Typical components of an air-cooled heat exchanger  4.6 The purchaser shall specify if the service is designated as sour in accordance with ISO 15156 (all parts) for oil and gas production facilities and natural gas sweetening plants, or designated as wet hydrogen sulfide service in accordance with NACE MR0103 for other applications (e.g. petroleum refineries, LNG plants and chemical plants), in which case all materials in contact with the process fluid shall meet the requirements of the applicable NACE standard to mitigate the potential for sulfide stress cracking (SSC). Identification of the complete set of materials, qualification, fabrication, and testing specifications to prevent in-service environmental cracking is the responsibility of the user (purchaser). NOTE For the purpose of this provision NACE MR0175 is equivalent to ISO 15156 (all parts).  4.7 The requirement for winterization and its type shall be specified by the purchaser. Annex C contains guidance on various methods of winterization for air-cooled heat exchangers. 5 Proposals 5.1 The vendor's proposal shall include a completed data sheet for each item (see example in Annex B). 5.2 A proposal drawing that shows the major dimensions in plan and elevation, and the nozzle sizes and their orientation shall be furnished. 5.3 The proposal shall state whether vertically mounted electric motors shall be shaft up or shaft down. 5.4 The proposal shall fully define the extent of shop assembly and include a general description of the components for assembly in the field. SIST EN ISO 13706:2012

ISO 13706:2011(E) © ISO 2011 – All rights reserved 7 5.5 Any proposal for a design that is not fully described in this International Standard shall include additional drawings sufficient to describe the details of construction. 5.6 The proposal shall include a detailed description of any exceptions to the specified requirements.  5.7 The proposal shall include noise data. The proposal shall include a noise data sheet (see example in Annex B) if specified by the purchaser. 5.8 The proposal shall include fan performance characteristic curves with the design point marked on the curves. 5.9 The proposal shall include details of the method used to secure the fin ends; see 7.1.11.7. 5.10 The proposal for an air-cooled exchanger with a recirculation system (as described in Annex C) shall include drawings showing the duct and plenum sizes, net free flow area, louvre type and arrangement, drive location, and proposed control schematic. 6 Documentation 6.1 Approval information  6.1.1 For each item number, the vendor shall produce documents that include the following information. The purchaser shall specify which documents shall be submitted and which of them shall be subject to approval. a) purchaser’s item number, service, project name and location, purchaser's order number and vendor's shop order number; b) design pressure, maximum allowable working pressure, test pressure, maximum and minimum design temperature, and corrosion allowance; c) fan performance characteristic curves with the design point marked on the curve, including fan critical speeds for use with variable-frequency drives; d) any applicable codes and purchase specifications of the purchaser; e) material specifications and grades for all pressure parts; f) overall dimensions; g) dimensions and locations of supports and sizes of holding-down bolts; h) nozzle size, rating, facing, location, projection beyond header surface, allowable loadings (forces and moments) and direction of flow; i) drive mount details; j) masses of the tube bundle, the exchanger empty and full of water, and the mass of the heaviest component or combination of components intended by the vendor for handling in a single lift; k) column reactions for each load type listed in 7.3.3; l) post-weld heat treatment requirements; m) U-bend heat treatment or annealing procedure; n) radiographic and other non-destructive examination requirements; o) surface preparation and painting requirements; SIST EN ISO 13706:2012

ISO 13706:2011(E) 8 © ISO 2011 – All rights reserved p) design exposure temperatures for mechanical and instrumentation components; q) nameplate and its position; r) tube-to-tubesheet joint and details of joint preparation; s) maximum and minimum plug torque values with recommended thread lubrication; t) when sour or wet sulfide service is specified by the purchaser, a certified material test report (CMTR) shall be supplied for all carbon steel materials in contact with the process fluid. 6.1.2 The vendor shall also furnish gasket detail drawings, field assembly drawings, and drawings for all auxiliary equipment and controls furnished. Drawings shall show electrical and control connections, including those of motive and signal air for any pneumatically actuated louvres or fans. The gasket details shall include type and material, and shall be shown on a separate drawing.  6.1.3 If specified by the purchaser, calculations required by the pressure design code shall be provided for the design of pressure components, including header boxes, tubes and tube joints. Sufficient detail shall be supplied for

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