1、BRITISH STANDARDBS EN 14276-2:2007Pressure equipment for refrigerating systems and heat pumps Part 2: Piping General requirementsICS 23.020.30; 27.080; 27.200g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g5
2、5g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58+A1:2011 National forewordThis British Standard is the UK implementation of EN 14276-2:2007+A1:2011. It supersedes BS EN 14276-2:2007, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RHE/18, Ref
3、rigeration safety.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot con
4、fer immunity from legal obligations.BS EN 14276-2:2007+A1:2011Amendments/corrigenda issued since publicationDate Comments 30 June 2011 Implementation of CEN amendment A1:2011This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2
5、011ISBN 978 0 580 71101 5EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14276-2:2007+A1 February 2011 ICS 23.020.30; 27.080; 27.200 Supersedes EN 14276-2:2007English Version Pressure equipment for refrigerating systems and heat pumps - Part 2: Piping - General requirements Equipements sous pre
6、ssion pour systmes de rfrigration et pompes chaleur - Partie 2: Tuyauteries - Exigences gnrales Druckgerte fr Klteanlagen und Wrmepumpen - Teil 2: Rohrleitungen - Allgemeine Anforderungen This European Standard was approved by CEN on 17 February 2007 and includes Amendment 1 approved by CEN on 13 De
7、cember 2010.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 o
8、btained 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
9、 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, Luxembou
10、rg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights
11、of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14276-2:2007+A1:2011: EEN 14276-2:2007+A1:2011 (E) 2 Contents Page Foreword 3Introduction .41 Scope 52 Normative references 63 Terms, definitions, symbols, quantities and units .74 Material .85 Pipi
12、ng classification 96 Design 117 Manufacturing . 178 Testing and inspection . 17Annex A (informative) DN System 27Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC . 28Bibliography . 29BS EN 14276-2:2007+A1:2011EN 14276-2:2007+A
13、1:2011 (E) 3 Foreword This document (EN 14276-2:2007+A1:2011) has been prepared by Technical Committee CEN/TC 182 “Refrigerating systems, safety and environmental requirements”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either b
14、y publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011. This document includes Amendment 1, approved by CEN on 2010-12-13. This document supersedes EN 14276-2:2007. The start and finish of
15、 text introduced or altered by amendment is indicated in the text by tags ! “. 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 Eu
16、ropean Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports Essential Requirements of EU Directive 97/23/EC concerning pressure equipment. For relationship with EU Directive 97/23/EC, see informative Annex ZA, which
17、is an integral part of this document. This document consists of the following parts under the general title Pressure equipment for refrigerating systems and heat pumps: Part 1: Vessels General requirements; Part 2: Piping General requirements. According to the CEN/CENELEC Internal Regulations, the n
18、ational 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, Netherlan
19、ds, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 14276-2:2007+A1:2011EN 14276-2:2007+A1:2011 (E) 4 Introduction This European Standard recognises the unique nature of piping for refrigerating systems or heat pumps and is intended to addr
20、ess the specific needs of the refrigeration and heat pump industry. This European Standard should be read in conjunction with the various parts of EN 13480 and !EN 14276-1:2006+A1“. The unique nature of a refrigerating system is defined in the introduction of !EN 14276-1:2006+A1“. BS EN 14276-2:2007
21、+A1:2011EN 14276-2:2007+A1:2011 (E) 5 1 Scope 1.1 This European Standard specifies the requirements for material, design, manufacturing, testing and documentation for stationary piping intended for use in refrigerating systems, heat pumps and secondary cooling and heating systems. These refrigeratin
22、g systems and heat pump systems are referenced in this standard as refrigerating systems as defined in EN 378-1. 1.2 This European Standard applies to piping including welded or brazed attachments up to and including the flanges, screwed, welded or brazed connectors or to the edge to be welded or br
23、azed at the first circumferential joint connecting piping or other elements. 1.3 This European Standard applies to the selection, application and installation of safety accessories intended to protect the piping during the various phases of the refrigeration cycle. 1.4 This European Standard applies
24、 to the following piping: heat exchanger consisting of piping for the purpose of cooling or heating air where piping aspects are predominant; piping incorporated into an assembly (e.g. self contained system, condensing unit); field erected piping. 1.5 This European Standard applies to piping with an
25、 internal pressure down to 1 bar, to account for the evacuation of the piping prior to charging with refrigerant. 1.6 This European Standard applies to both the mechanical loading conditions and thermal conditions as defined in EN 13480-3 associated with refrigerating systems. It applies to piping s
26、ubject to the maximum allowable temperatures for which nominal design stresses for materials are derived using !EN 14276-1:2006+A1“ or as specified in this European Standard. In addition piping designed to this standard needs to have a maximum design temperature not exceeding 200 C and a maximum des
27、ign pressure not exceeding 64 bar. Outside of these limits, EN 13480 should be used for the design construction and inspection of the piping. Under these circumstances the unique nature of a refrigerating plant, as indicated in the introduction of !EN 14276-1:2006+A1“, needs also to be taken into ac
28、count. 1.7 This European Standard applies to piping where the main pressure bearing parts are manufactured from metallic ductile materials as defined in Clause 4 and in !EN 14276-1:2006+A1“. BS EN 14276-2:2007+A1:2011EN 14276-2:2007+A1:2011 (E) 6 2 Normative references The following referenced docum
29、ents 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. !EN 378-1:2008+A1:2010, Refrigerating systems and heat pumps Safety and environ
30、mental requirements Part 1: Basic requirements, definitions, classification and selection criteria EN 378-2:2008+A1:2009, Refrigerating systems and heat pumps Safety and environmental requirements Part 2: Design, construction, testing, marking and documentation EN 378-3:2008, Refrigerating systems a
31、nd heat pumps Safety and environmental requirements Part 3: Installation site and personal protection EN 378-4:2008, Refrigerating systems and heat pumps Safety and environmental requirements Part 4: Operation, maintenance, repair and recovery“ EN 571-1:1997, Non destructive testing Penetrant testin
32、g Part 1: General principles EN 583-4:2002, Non-destructive testing Ultrasonic examination Part 4: Examination for discontinuities perpendicular to the surface EN 764-1:2004, Pressure equipment Terminology Part 1: Pressure, temperature, volume, nominal size EN 764-2:2002, Pressure equipment Part 2:
33、Quantities, symbols and units EN 764-3:2002, Pressure equipment Part 3: Definition of parties involved EN 764-4:2002, Pressure equipment Part 4: Establishment of technical delivery conditions for metallic materials EN 764-5:2002, Pressure equipment Part 5: Compliance and inspection documentation of
34、materials EN 970:1997, Non-destructive examination of fusion welds Visual examination EN 1289:1998, Non-destructive examination of welds Penetrant testing of welds Acceptance levels EN 1435:1997, Non-destructive examination of welds Radiographic examination of welded joints EN 1653:1997, Copper and
35、copper alloys Plate, sheet and circles for boilers, pressure vessels and hot water storage units EN 1712:1997, Non-destructive examination of welds Ultrasonic examination of welded joints Acceptance levels EN 1714:1997, Non-destructive examination of welds Ultrasonic examination of welded joints EN
36、10204:2004, Metallic products Types of inspection documents EN 10246-9:2000, Non-destructive testing of steel tubes Part 9: Automatic ultrasonic testing of the weld seam of submerged arc welded steel tubes for the detection of longitudinal and/or transverse imperfections EN 10246-16:2000, Non-destru
37、ctive testing of steel tubes Part 16: Automatic ultrasonic testing of the area adjacent to the weld seam of welded steel tubes for the detection of laminar imperfections BS EN 14276-2:2007+A1:2011EN 14276-2:2007+A1:2011 (E) 7 EN 12178:2003, Refrigerating systems and heat pumps Liquid level indicatin
38、g devices Requirements, testing and marking EN 12517-1:2006, Non-destructive testing of welds Part 1: Evaluation of welded joints in steel, nickel, titanium and their alloys by radiography Acceptance levels EN 12735-1:2001, Copper and copper alloys Seamless, round copper tubes for air conditioning a
39、nd refrigeration Part 1: Tubes for piping systems EN 12735-2:2001, Copper and copper alloys Seamless, round copper tubes for air conditioning and refrigeration Part 2: Tubes for equipment !EN 13445-3:2009, Unfired pressure vessels Part 3: Design“ EN 13480-2:2002, Metallic industrial piping Part 2: M
40、aterials EN 13480-3:2002, Metallic industrial piping Part 3: Design and calculation !EN 14276-1:2006+A1:2011, Pressure equipment for refrigerating systems and heat pumps Part 1: Vessels General requirements“ EN 22553:1994, Welded, brazed and soldered joints Symbolic representation on drawings (ISO 2
41、553:1992) !EN ISO 4063:2009, Welding and allied processes Nomenclature of processes and reference numbers (ISO 4063:2009)“ EN ISO 10042:2005, Welding Arc-welded joints in aluminium and its alloys Quality levels for imperfections (ISO 10042:2005) !EN ISO 23277:2009, Non-destructive testing of welds P
42、enetrant testing of welds Acceptance levels (ISO 23277:2006)“ ISO 817:2005, Refrigerants Designation system 3 Terms, definitions, symbols, quantities and units !For the purposes of this document, the terms, definitions, symbols, quantities and units given in EN 378-1:2008+A1:2010, EN 764-1:2004, EN
43、764-2:2002, EN 764-3:2002, EN 764-4:2002, EN 764-5:2002, EN 14276-1:2006+A1:2011 and the following apply.“ 3.1 Terms and definitions 3.1.1 coil heat exchanger consisting of pipe or tubing (more particularly made from one or more bent pipes) used to cool or heat air NOTE see Figure 1 BS EN 14276-2:20
44、07+A1:2011EN 14276-2:2007+A1:2011 (E) 8 a) Coil with straight tubes and elbows b) Coil with elbow and headers Figure 1 Coil 3.2 Symbols, quantities and units Symbols, quantities and units used in this standard are listed in Table 1. Table 1 Symbols, quantities and units Symbol Quantity Unit DNaNomin
45、al diameter DeExternal diameter of tube mm f Nominal design stress at design temperature MPa PcCalculation pressure (in formula, Pccan be replaced by P) MPa or bar bPdDesign pressure MPa or bar bPS Maximum allowable pressure MPa or bar bPtestTest pressure MPa or bar bRRadius of curvature for tube mm
46、 tcCalculation temperature C tdDesign temperature C z Joint coefficient for welds aSee also Annex A b1 bar = 100 000 Pa = 0,1 MPa = 0,1 N/mm24 Material 4.1 General The materials referenced in this European Standard shall meet the requirements of !EN 14276-1:2006+A1“ unless modified by the subclauses
47、 of this clause. It is permitted to use non-metallic materials (e.g. gaskets, coatings, insulating materials, sight glasses) provided they are compatible with the other materials, refrigerants and lubricants present. BS EN 14276-2:2007+A1:2011EN 14276-2:2007+A1:2011 (E) 9 Sight glasses shall comply
48、with EN 12178 for pressure bearing requirements. 4.2 Requirements for materials to be used for pressurised parts Materials listed in this European Standard have been identified for use in refrigerating piping. If it is required to utilise a material not listed in this European Standard, the requirem
49、ents of EN 13480-2 shall be followed where applicable and the unique nature of refrigerating plant requirements shall also be taken into account. 4.3 Materials 4.3.1 Piping manufactured from the following materials satisfies the requirements of this European Standard for the pressurised parts: 4.3.1.1 Where mechanical properties may be modified by the piping manufacturing process, the material shall be se
