SIST EN 14870-1:2005
(Main)Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends (ISO 15590-1:2001 modified)
Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends (ISO 15590-1:2001 modified)
This part of prEN 14870 specifies the technical delivery conditions for bends made by the induction bending process for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623.
This part of prEN 14870 is applicable to induction bends made from seamless and welded pipe of unalloyed or low-alloy steels.
This part of prEN 14870 specifies three classes of induction bend corresponding to increasing quality requirements in accordance with the technical delivery conditions of ISO 3183 for pipe as indicated in Table 1 (see also ISO 3183-3:1999, Introduction).
Table 1 - Induction bend class and corresponding pipe standard
Induction bend class Corresponding pipe standard
Class A ISO 3183-1
Class B ISO 3183-2
Class C ISO 3183-3
This part of prEN 14870 is not applicable to the selection of the induction bend class.
This part of prEN 14870 is not applicable to pipeline bends made by other manufacturing processes.
On-land supply systems used by the gas supply industry are excluded from the scope of this standard.
Erdöl- und Erdgasindustrie - Im Induktionsverfahren gefertigte Rohrbögen, Fittings und Flansche für Rohrleitungs-Transportsysteme - Teil 1: Im Induktionsverfahren gefertigte Rohrbögen (ISO 15590-1:2001 modifiziert)
Dieser Teil der prEN 14870 (WI 00012096) (ISO 15590-1:2001 modifiziert) legt die technischen Lieferbe-dingungen für im Induktionsverfahren gefertigte Rohrbögen für die Verwendung in Rohrleitungtransportsystemen für die Erdöl- und Erdgasindustrie nach den Festlegungen in ISO 13623 fest.
Dieser Teil der prEN 14870 (WI 00012096) (ISO 15590-1:2001 modifiziert) gilt für im Induktionsverfahren aus nahtlosen und geschweißten Rohren aus unlegiertem oder niedrig legiertem Stahl gefertigte Rohrbögen.
Dieser Teil der prEN 14870 (WI 00012096) (ISO 15590-1:2001 modifiziert) legt für diese Rohrbögen drei Anforderungsklassen mit steigenden Qualitätsanforderungen nach den technischen Lieferbedingungen in ISO 3183 für Rohr fest, wie in Tabelle 1 angegeben (siehe auch ISO 3183-3:1999, Einleitung).
Tabelle 1 - Klasseneinteilung der im Induktionsverfahren
gefertigten Rohrbögen und entsprechenden Rohr-Norm
Induktivrohrbogen
Anforderungsklasse Entspricht
der Rohr-Norm
Anforderungsklasse A ISO 3183-1
Anforderungsklasse B ISO 3183-2
Anforderungsklasse C ISO 3183-3
Dieser Teil der prEN 14870 (WI 00012096) (ISO 15590-1:2001 modifiziert) gilt nicht für die Auswahl der jeweiligen Anforderungsklasse der Rohrbögen.
Dieser Teil der prEN 14870 (WI 00012096) (ISO 15590-1:2001 modifiziert) gilt nicht für Rohrleitungsbogen, die nach
anderen Verfahren gefertigt werden.
Rohrleitungstransportsysteme für die Gasversorgung an Land fallen nicht in den Anwendungsbereich dieser Norm.
Industries du pétrole et du gaz naturel - Coudes d'induction, raccords et brides pour systemes de transport par conduites -Partie 1: Coudes d'induction (ISO 15590-1:2001 modifiée)
Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends (ISO 15590-1:2001 modified)
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends (ISO 15590-1:2001 modified)Erdöl- und Erdgasindustrie - Im Induktionsverfahren gefertigte Rohrbögen, Fittings und Flansche für Rohrleitungs-Transportsysteme - Teil 1: Im Induktionsverfahren gefertigte Rohrbögen (ISO 15590-1:2001 modifiziert)Industries du pétrole et du gaz naturel - Coudes d'induction, raccords et brides pour systemes de transport par conduites -Partie 1: Coudes d'induction (ISO 15590-1:2001 modifiée)Petroleum and natural gas industries - Induction bends, fittings and flanges for pipeline transportation systems - Part 1: Induction bends (ISO 15590-1:2001 modified)83.140.30Cevi, fitingi in ventili iz polimernih materialovPlastics pipes, fittings and valves75.200Petroleum products and natural gas handling equipmentICS:Ta slovenski standard je istoveten z:EN 14870-1:2004SIST EN 14870-1:2005en01-marec-2005SIST EN 14870-1:2005SLOVENSKI
STANDARD
SIST EN 14870-1:2005
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14870-1October 2004ICS 75.200; 23.040.40; 23.040.60English versionPetroleum and natural gas industries - Induction bends, fittingsand flanges for pipeline transportation systems - Part 1:Induction bends (ISO 15590-1:2001 modified)Industries du pétrole et du gaz naturel - Coudes d'induction,raccords et brides pour systèmes de transport parconduites -Partie 1: Coudes d'induction (ISO 15590-1:2001modifiée)Erdöl- und Erdgasindustrie - Im Induktionsverfahrengefertigte Rohrbögen, Fittings und Flansche fürRohrleitungstransportsysteme - Teil 1: ImInduktionsverfahren gefertigte Rohrbögen (ISO 15590-1:2001 modifiziert)This European Standard was approved by CEN on 15 July 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14870-1:2004: ESIST EN 14870-1:2005
EN 14870-1:2004 (E) 2 Contents page Explanatory Note.3 Foreword.4 Introduction.5 1 Scope.6 2 Normative references.6 3 Terms and definitions.7 4 Symbols and abbreviated terms.9 5 Designation.9 6 Pressure rating and design.10 7 Information to be supplied by the purchaser.10 7.1 Principal information.10 7.2 Supplementary information.10 7.3 Information on the mother pipe.11 8 Manufacturing.12 8.1 Manufacturing procedure specification.12 8.2 Mother pipe.13 8.3 MPS qualification.13 8.4 Production bending.13 8.5 Post-bending heat treatment.13 8.6 Forming and sizing after bending.14 8.7 Strip/plate end welds.14 8.8 Jointers and girth welds.14 8.9 End preparation.14 9 Testing and inspection.15 9.1 General requirements.15 9.2 Extent of testing and inspection.15 9.3 Chemical composition.15 9.4 Physical testing.15 9.5 Non-destructive testing.22 9.6 Dimensions.24 9.7 Gauging.26 9.8 Hydrostatic testing.26 10 Inspection document.27 11 Marking.27 Annex ZA (normative)
Normative references to international publications with their European publication correspondence.30 Bibliography.31
SIST EN 14870-1:2005
EN 14870-1:2004 (E) 3 Explanatory Note
ISO 15590-1:2001, developed within ISO/TC 67 SC 2, has been adopted as EN 14870-1:2004 (ISO 15590-1 : 2001 modified).
The scope of ISO/TC 67/SC 2 is pipeline transportation systems for the petroleum and natural gas industries without exclusions. However in CEN, the scopes of CEN/TC 12 and CEN/TC 234 overlapped until 1995.This scope overlap caused problems for the parallel procedure for the above-mentioned items. The conflict in scope was resolved when both the CEN/Technical Committees and the CEN/BT took the following resolution:
Resolution BT 38/1995: Subject: Revised scope of CEN/TC 12
“BT endorses the conclusions of the coordination meeting between CEN/TC 12 “Materials, equipment and offshore structures for petroleum and natural gas industries” and CEN/TC 234 “Gas supply” and modifies the CEN/TC 12 scope, to read:
“Standardization of the materials, equipment and offshore structures used in drilling, production, refining and the transport by pipelines of petroleum and natural gas, excluding on-land supply systems used by the gas supply industry and those aspects of offshore structures covered by IMO requirement (ISO/TC 8). The standardization is to be achieved wherever possible by the adoption of ISO Standards.”
Resulting from Resolution BT 38/1995, "gas supply on land" has been excluded from the scope of ISO 15590-1 : 2001 for the European adoption by CEN/TC 12.
SIST EN 14870-1:2005
EN 14870-1:2004 (E) 4 Foreword The text of ISO 15590-1:2001 has been prepared by Technical Committee ISO/TC 67 “Materials, equipment and offshore structures for petroleum and natural gas industries” of the International Organization for Standardization (ISO) and has been taken over as EN 14870-1:2004 by 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 April 2005, and conflicting national standards shall be withdrawn at the latest by April 2005. International Standard ISO 15590-1 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum and natural gas industries, Subcommittee SC 2, Pipeline transportation systems. EN 14870 consists of the following parts, under the general title Petroleum and natural gas industries — Induction bends, fittings and flanges for pipeline transportation systems : Part 1 : Induction bends Part 2 : Fittings Part 3 : Flanges According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 5 Introduction Users of this part of EN 14870 should be aware that further or differing requirements may be needed for individual applications. This part of EN 14870 is not intended to inhibit a manufacturer 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, the manufacturer should identify any variations from this part of EN 14870 and provide details. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 6 1 Scope This part of EN 14870 specifies the technical delivery conditions for bends made by the induction bending process for use in pipeline transportation systems for the petroleum and natural gas industries as defined in ISO 13623. This part of EN 14870 is applicable to induction bends made from seamless and welded pipe of unalloyed or low-alloy steels. This part of EN 14870 specifies three classes of induction bend corresponding to increasing quality requirements in accordance with the technical delivery conditions of ISO 3183 for pipe as indicated in Table 1 (see also ISO 3183-3:1999, Introduction). Table 1 — Induction bend class and corresponding pipe standard Induction bend class Corresponding pipe standard Class A ISO 3183-1 Class B ISO 3183-2 Class C ISO 3183-3 This part of EN 14870 is not applicable to the selection of the induction bend class. This part of EN 14870 is not applicable to pipeline bends made by other manufacturing processes. On-land supply systems used by the gas supply industry are excluded from the scope of this standard.
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 148, Steel – Charpy impact test (V-notch). EN ISO 377, Steel and steel products - Location and preparation of samples and test pieces for mechanical testing (ISO 377:1997) ISO 783, Metallic materials – Tensile testing at elevated temperature. EN ISO 2566-1, Steel – Conversion of elongation values – Part 1 : Carbon and low alloy steels (ISO 2566-1:1984). ISO 3183-1, Petroleum and natural gas industries – Steel pipe for pipelines – Technical delivery conditions – Part 1 : Pipes of requirement class A. ISO 3183-2, Petroleum and natural gas industries – Steel pipe for pipelines – Technical delivery conditions – Part 2 : Pipes of requirement class B. ISO 3183-3:1999, Petroleum and natural gas industries – Steel pipe for pipelines – Technical delivery conditions – Part 3 : Pipes of requirement class C. EN ISO 6507-1, Metallic materials – Vickers hardness test – Part 1 : Test method (ISO 6507-1:1997) SIST EN 14870-1:2005
EN 14870-1:2004 (E) 7 ISO 6892, Metallic materials – Tensile testing at ambient temperature. EN ISO 7438, Metallic materials – Bend test (ISO 7438:1985). ISO/TR 7705:1991, Guidelines for specifying Charpy V-notch impact prescriptions in steel specifications. EN 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 8501-1:1988). ISO 9305, Seamless steel tubes for pressure purposes – Full peripheral ultrasonic testing for the detection of transverse imperfections. ISO 9712, Non-destructive testing – Qualification and certification of personnel. ISO 10124, Seamless and welded (except submerged arc-welded) steel tubes for pressure purposes – Ultrasonic testing for the detection of laminar imperfections. ISO 10474, Steel and steel products – Inspection documents. ISO 11496, Seamless and welded steel tubes for pressure purposes – Ultrasonic testing of tube ends for the detection of laminar imperfections. ISO 12094, Welded steel tubes for pressure purposes – Ultrasonic testing for the detection of laminar imperfections in strips/plates used in the manufacture of welded tubes. ISO 12095, Seamless and welded steel tubes for pressure purposes – Liquid penetrant testing. ISO 13623, Petroleum and natural gas industries – Pipeline transportation systems. ISO 13664, Seamless and welded steel tubes for pressure purposes – Magnetic particle inspection of the tube ends for the detection of laminar imperfections. ISO 13665, Seamless and welded steel tubes for pressure purposes – Magnetic particle inspection of the tube body for the detection of surface imperfections. ASTM E 112, Standard test methods for determining average grain size. ASTM E 340, Standard test method for macroetching metals and alloys. ASTM E 797, Standard practice for measuring thickness by manual ultrasonic pulse-echo contact method. EN ISO 15156-2:2003, Petroleum, petrochemical and natural gas industries - Materials for use in H2S-containing environments in oil and gas production - Part 2: Cracking-resistant carbon and low alloy steels, and the use of cast irons (ISO 15156-2:2003)
3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 arc curved portion of a bend SIST EN 14870-1:2005
EN 14870-1:2004 (E) 8 3.2 bend angle amount of directional change through the bend 3.3 bend radius distance from the centre of curvature to the centreline axis of the bent pipe 3.4 by agreement agreed between manufacturer and purchaser 3.5 extrados outer curved section of the bend arc 3.6 heat batch of steel prepared in one steel-making operation 3.7 induction bending continuous bending process which utilizes induction heating to create a narrow, circumferential, heated band around the material being bent 3.8 intrados inner curved section of the bend arc 3.9 manufacturing procedure specification MPS document which specifies the properties and description of the mother pipe, the bending procedure, the post- bending heat treatment equipment and cycle, the qualification bend testing results, the non-destructive testing procedures and the weld end bevel details used for the manufacture of the bends 3.10 mother pipe straight section of pipe from which an induction bend is made 3.11 tangent straight section at the ends of an induction bend 3.12 transition zone areas at the start and stop points of bending which include material that extends from the unheated mother pipe to the material that has been heated to the full bending temperature 3.13 wall thinning amount of reduction from the original wall thickness of the pipe to the wall thickness in the extrados after bending SIST EN 14870-1:2005
EN 14870-1:2004 (E) 9 4 Symbols and abbreviated terms For the purpose of this part of EN 14870, the following symbols and abbreviations apply. A Percentage of elongation of tensile test specimen after fracture CE Carbon equivalent CTOD Crack tip opening displacement testing D Specified diameter (outside or inside) Dmax Maximum measured diameter (outside or inside) Dmin Minimum measured diameter (outside or inside) DWT Drop-weight tear testing HAZ Heat-affected zone HIC Hydrogen-induced cracking HFW High-frequency welded MT Magnetic particle testing NDT Non-destructive testing PT Liquid penetrant testing R Bend centreline radius r Mean radius of the mother pipe Rm Ultimate tensile strength Rt 0,5 Yield strength for 0,5 % total elongation RT Radiographic testing SAW Submerged arc welding SAWH Helical seam SAW pipe So Initial cross-sectional area of the gauge length of a tensile test specimen SSC Sulfide stress-cracking Td min Minimum design temperature specified by the purchaser ti Minimum wall thickness at the bend intrados
tmin Minimum wall thickness required in accordance with ISO 13623 for the straight pipe adjacent to the bend UT Ultrasonic testing WPS Welding procedure specification 5 Designation Designation of induction bends shall take the form IB xxx-A or B or C or CS, where : xxx is the specified minimum yield strength, expressed in megapascals ; the suffix A, B, C identifies the technical delivery conditions class for induction bends in non-sour service ; the suffix CS identifies class C bends for use in sour-service conditions. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 10 6 Pressure rating and design The hoop stress in the induction bend due to internal fluid pressure shall not exceed the hoop stress permitted in ISO 13623 for the adjacent straight pipe. Compliance with this requirement shall be demonstrated either by calculations or by satisfying both of the following requirements. a) The wall thickness of the bend extrados shall be at least tmin. b) The wall thickness at the bend intrados shall be at least : ()rRrRtt−−×=22mini For pipelines not designed in accordance with ISO 13623, it may be permitted for the wall thickness of the bend extrados to be less than tmin. The requirements in this clause address the design of a bend against internal pressure. Other loads, both static and dynamic, and pipeline test conditions also need to be considered by the designer to demonstrate compliance with the strength requirements of ISO 13623. 7 Information to be supplied by the purchaser 7.1 Principal information The purchaser shall provide the following information, in the order given below : a) bend designation of each bend ; b) quantity of bends ; c) supply of mother pipe by the purchaser or the manufacturer ; d) required bend dimensions, including : 1) diameter (inside or outside), 2) minimum wall thickness, 3) radius, 4) bend angle, 5) tangent lengths ; e) end preparation if different from square ends. 7.2 Supplementary information If applicable, the purchaser should specify the following supplementary information : a) minimum design temperature ; b) maximum design temperature ; SIST EN 14870-1:2005
EN 14870-1:2004 (E) 11 c) maximum wall thickness ; d) special dimensional requirements ; e) requirements for supplementary inspection and testing ; f) requirements for gauging and other measurements of dimensions if different from this part of EN 14870; g) pipeline design standard or design factors, if different from ISO 13623 ; h) pipeline operating conditions ; i) whether post-bending heat treatment is to be applied ; j) mechanical property requirements at the maximum design temperature ; k) requirements for proof, burst or hydrostatic testing ; l) hold-points for witness and approval by purchaser ; m) surface condition ; n) coating or painting requirements ; o) marking requirements if different from this part of EN 14870; p) packaging and shipping instructions ; q) third-party inspection organization ; r) standard designation in accordance with ISO 10474 of inspection document required ; s) requirements for format and additional content of the inspection document. 7.3 Information on the mother pipe If the mother pipe is supplied by the purchaser, the following information on the mother pipe shall be provided to the manufacturer : a) purchasing specification ; b) pipe diameter (inside or outside) ; c) pipe wall thickness (nominal or minimum) ; d) pipe lengths ; e) pipe manufacturer ; f) inspection documents with complete chemical composition, mechanical properties, results of NDT and dimensions ; g) welding procedure specification and weld metal chemical composition for SAW and SAWH pipe ; h) weld seam repair welding procedure specification for SAW and SAWH pipe. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 12 8 Manufacturing 8.1 Manufacturing procedure specification Test bends shall be manufactured in accordance with a preliminary MPS documented before commencement of test bending. The preliminary MPS shall be modified as necessary, based on the parameters recorded during test bending, prior to commencing production bending. If specified by the purchaser, manufacturing shall not proceed until the MPS has been accepted by the purchaser. The MPS shall specify the following details. a) Information on the mother pipe : 1) name of manufacturer ; 2) steel class and name ; 3) pipe forming process ; 4) pipe dimensions ; 5) chemical composition ; 6) mechanical properties ; 7) welding procedure and weld metal chemical composition for welded pipe ; 8) inspection technique and reports for weld seam ; 9) weld seam repair procedures ; 10) heat treatment conditions. b) Testing and inspection requirements for : 1) qualification test bend ; 2) production bends. c) Bending process details : 1) pipe cleaning method prior to bending ; 2) identification of the bending machine ; 3) method of temperature measurement and control during bending ; 4) values of bending parameters (see Table 2) ; 5) heating and quenching of tangent ends. d) Details of post-bending heat treatment : 1) type of post-bending heat treatment ; 2) heating rate, soaking time and temperature, cooling rate ; 3) type and location of thermocouples. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 13 e) Sizing and rounding processes. f) Additional purchaser requirements (such as end preparation, coating and marking). 8.2 Mother pipe The mother pipe may be supplied by either the purchaser or the manufacturer. If the mother pipe is supplied by the purchaser, the manufacturer should be consulted as to the required chemical composition, properties and dimensions of the mother pipe (including seam weld and seam repair weld) regarding suitability for induction bending. Permissible welding processes for the mother pipe shall be as allowed in the corresponding part of ISO 3183. The mother pipe should not contain weld repairs to the pipe body. The wall thickness of the mother pipe shall have adequate allowance for wall thinning at the extrados due to induction bending. The surface of the mother pipe shall be free of contamination by low-melting temperature metals, such as copper, brass and aluminium. 8.3 MPS qualification Bend manufacture shall be carried out in accordance with an MPS which shall be qualified in accordance with this clause before commencement of production. A test bend with a sufficient arc length to allow extraction of the necessary test specimens shall be manufactured in accordance with each preliminary MPS. The inspection and testing of the test bend shall include tangents and transition zones if included in the produced bends. The test bend shall be tested and inspected in accordance with clause 9. The MPS to be used for production shall, for each of the essential variables in Table 2, specify : the values recorded during the manufacturing of the test bend ; the permissible range during production bending. The variation in essential variables shall not exceed the permissible limits shown in Table 2. 8.4 Production bending Induction bending shall be carried out in accordance with a qualified MPS as specified in 8.3. Interruption of the induction bending operation shall result in rejection of the bend. 8.5 Post-bending heat treatment Post-bending heat treatment of bends is not mandatory for compliance with this part of EN 14870. Post-bending heat treatment may be performed to achieve the required material properties, improve corrosion resistance, remove transition zones at the ends of the bend arc or to relieve residual stresses. The temperature of each furnace-load of bends shall be monitored by thermocouples connected directly to selected bends and shall be recorded. The type and location of the thermocouples shall be as specified in the MPS. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 14 8.6 Forming and sizing after bending Hot forming, including spot heating, or hot sizing after bending, shall not be performed unless followed by a subsequent full heat treatment above the upper critical temperature. Cold forming or sizing without subsequent heat treatment is permitted provided the induced permanent strain does not exceed 1,5 %. Table 2 — Essential variables and maximum permissible variations Essential variable Maximum permissible variations Heat of steel None Mother pipe seam weld WPS and welding consumables None Nominal mother pipe diameter None Nominal mother pipe wall thickness ± 3 mm Bend radius For R ≤ 5D :()250% For 5D < R ≤10D :()1000% For R > 10D : ()unlimited0 Forming velocity
± 2,5 mm/min Forming temperature
± 25 °C Coil design
None Coolant None Coolant flowrate or pressure
± 10 % Coolant temperature
± 15 °C Induction heating frequency ± 20 % Weld seam location ± 15° from the location in the test bend Post-bending heat treatment Method:
no change Soaking time: ()150min
Soaking temperature: ± 15 oC
Heating and cooling rates:
by agreement The permissible variations apply to the values as stated in the MPS. 8.7 Strip/plate end welds Induction bends shall not contain strip/plate end welds. 8.8 Jointers and girth welds Induction bends shall not contain girth welds. 8.9 End preparation Bends shall be supplied with square ends unless otherwise specified by the purchaser. SIST EN 14870-1:2005
EN 14870-1:2004 (E) 15 9 Testing and inspection 9.1 General requirements An MPS shall be approved or production bends accepted only after all testing and inspection required in this clause have been performed and all results meet the specified requirements. Except where otherwise stated in this clause, the testing and inspection methods and acceptance criteria for induction bends shall be as required by the corresponding part of ISO 3183 for pipe of the same steel grade and type. Testing and inspection shall be carried out on bends after final heat treatment. Test results already available for the mother pipe may be used in place of re-testing where indicated in Table 3. If the pipeline installation techniques require post-weld heat treatment of the bend, the purchaser may require additional testing to demonstrate that the mechanical properties of the bend are also achieved after post-weld heat treatment. The purchaser shall specify the details of the post-weld heat treatment cycle to be used during pipeline installation. The test requirements and acceptance criteria shall be decided by agreement. 9.2 Extent of testing and inspection 9.2.1 MPS qualification test bend The extent of testing and inspection to be performed for qualification of
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