SIST EN 14620-2:2007

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C - Part 2: Metallic componentsOLConception et fabrication de réservoirs en acier a fond plat, verticaux, cylindriques, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et - 165 °C - Partie 2 : Constituants métalliquesAuslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Stahltanks für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und -165 °C - Teil 2: Metallische BauteileTa slovenski standard je istoveten z:EN 14620-2:2006SIST EN 14620-2:2007en23.020.10UH]HUYRDUMLStationary containers and tanksICS:SLOVENSKI
STANDARDSIST EN 14620-2:200701-januar-2007







EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14620-2
September 2006 ICS 23.020.10 English Version
Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C - Part 2: Metallic components
Conception et fabrication de réservoirs en acier à fond plat, verticaux, cylindriques, construits sur site, destinés au stockage des gaz réfrigérés, liquéfiés, dont les températures de service sont comprises entre 0 °C et -165 °C - Partie 2 : Constituants métalliques
Auslegung und Herstellung standortgefertigter, stehender, zylindrischer Flachboden-Stahltanks für die Lagerung von tiefkalt verflüssigten Gasen bei Betriebstemperaturen zwischen 0 °C und -165 °C - Teil 2: Metallische Bauteile This European Standard was approved by CEN on 20 February 2006.
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 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 translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36
B-1050 Brussels © 2006 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14620-2:2006: E



EN 14620-2:2006 (E) 2 Contents Page Foreword.4 1 Scope.5 2 Normative references.5 3 Terms and definitions.7 4 Materials.8 4.1 General.8 4.2 Temperatures.8 4.3 Primary and secondary liquid container.8 Table 1 — Product and steel class.9 Table 2 — Minimum Charpy V-notch impact test energy.11 4.4 Vapour container/outer tank.11 Table 3 — Steel for vapour container/outer tank.12 4.5 Other components.12 5 Design.13 5.1 Design theory.13 Table 4 — Determination of the maximum allowable design stress.14 Table 5 — Partial load and material factors for types I, II, III and IV steel.16 5.2 Primary and secondary liquid container.16 Figure 1 — Typical bottom layout.18 Table 6 — Minimum shell plate thickness.20 Figure 2 — Design flowchart for membranes.23 Table 7 — k factors for S-N curves (normal distribution assumed).28 5.3 Vapour container (outer tank).29 Figure 3 — Typical shell-roof compression areas.32 Table 8 — Minimum size of top corner ring.33 5.4 Suspended roof.33 5.5 Nozzles.33 Figure 4 — Typical roof nozzle with thermal distance piece.35 5.6 Primary and secondary containment, bottom connections.36 5.7 Connections between containers.36 5.8 Other details.36 6 Fabrication.38 6.1 Handling of materials.38 6.2 Plate preparation and tolerances.38 6.3 Tolerances.39 Table 9 — Radius tolerances.39 Table 10 — Maximum differences between the design and the as built profile.40 Table 11 — Tolerance limits on local deformation in welds.40 Figure 5 — Outward and inward peaking.41



EN 14620-2:2006 (E) 3 Figure 6 — Gauge for measuring peaking.41 Table 12 — Misalignment at vertical joints.42 6.4 Roof.42 6.5 Temporary attachments.42 7 Welding procedures.42 7.1 General.42 7.2 WPAR requirements.43 7.3 Impact testing.43 7.4 9 % Nickel steel.43 7.5 Welders and welding operators.44 7.6 Production test plates.44 8 Welding.45 8.1 Tack and temporary welds.45 8.2 Atmospheric conditions.45 8.3 Preheating.45 8.4 Post-weld heat treatment.45 Table 13 — Holding times at lower temperatures.46 9 Inspection.47 9.1 Qualification of NDE personnel.47 9.2 Inspection procedures.47 9.3 Type of inspections.47 Table 14 — Weld inspections of primary and secondary liquid container.48 Table 15 — Extent of radiographic/ultrasonic examination of shell welds of primary and secondary liquid container.48 Table 16 — Inspection of vapour barrier/liner.50 Table 17 — Extent of radiographic and ultrasonic examination of shell plate welds of vapour containers.51 9.4 Visual inspection.51 9.5 Dye penetrant examination.51 9.6 Magnetic particle examination.51 9.7 Vacuum box examination.51 9.8 Ammonia tightness test.52 9.9 Soap bubble examination.52 9.10 Radiographic examination.52 9.11 Ultrasonic examination.53 9.12 Acceptance criteria.53 9.13 Unacceptable defects in horizontal welds.53 9.14 Acceptable thinning after grinding.54 Annex A (informative)
Actions on membrane.55 Table A.1 — Static action.55 Table A.2 — Cyclic action.55 Table A.3 — Accidental action.55 Annex B (informative)
Determination of the load and fatigue curves for membrane.56 Figure B.1 — Flowchart for membranes.56 Bibliography.57



EN 14620-2:2006 (E) 4 Foreword This European Standard (EN 14620-2:2006) has been prepared by Technical Committee CEN/TC 265 “Site built metallic tanks for the storage of liquids”, the secretariat of which is held by BSI. 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 March 2007, and conflicting national standards shall be withdrawn at the latest by March 2007. EN 14620 Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and -165 °C consists of the following parts:  Part 1: General;  Part 2: Metallic components;  Part 3: Concrete components;  Part 4: Insulation components;  Part 5: Testing, drying, purging and cool-down. 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.



EN 14620-2:2006 (E) 5 1 Scope This European Standard specifies general requirements for the materials, design, construction and installation of the metallic components of refrigerated liquefied gas storage tanks. This European Standard deals with the design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0 °C and –165 °C. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 287-1, Qualification test of welders — Fusion welding — Part 1: Steels EN 462-1, Non-destructive testing — Image quality of radiographs — Part 1: Image quality indicators (wire type) — Determination of image quality value EN 462-2, Non-destructive testing — Image quality of radiographs — Part 2: Image quality indicators (step/hole type) — Determination of image quality value EN 473, Non-destructive testing — Qualification and certification of NDT personnel — General principles EN 571-1, Non-destructive testing — Penetrant testing — Part 1: General principles EN 584-1, Non-destructive testing — Industrial radiographic film — Part 1: Classification of film systems for industrial radiography EN 584-2, Non-destructive testing — Industrial radiographic film — Part 2: Control of film processing by means of reference values EN 875, Destructive tests on welds in metallic materials — Impact tests — Test specimen location, notch orientation and examination EN 970, Non-destructive examination of fusion welds — Visual examination EN 1011-2, Welding — Recommendations for welding of metallic materials — Part 2: Arc welding of ferritic steels EN 1092-1:2001, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN designated — Part 1: Steel flanges EN 1290, Non-destructive testing of welds — Magnetic particle testing of welds EN 1418, Welding personnel — Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanized and automatic welding of metallic materials EN 1435:1997, Non-destructive examination of welds — Radiographic examination of welded joints EN 1515-1:1999, Flanges and their joints — Bolting — Part 1: Selection of bolting EN 1593, Non-destructive testing — Leak testing — Bubble emission techniques



EN 14620-2:2006 (E) 6 EN 1712:1997, Non-destructive testing of welds — Ultrasonic testing of welded joints — Acceptance levels EN 1714:1997, Non-destructive testing of welds — Ultrasonic testing of welded joints EN 1759-1:2004, Flanges and their joint — Circular flanges for pipes, valves, fittings and accessories, Class designated — Part 1: Steel flanges, NPS 1/2 to 24 EN 1993-1-1, Eurocode 3: Design of steel structures — Part 1-1: General rules and rules for buildings ENV 1993-1-6, Eurocode 3: Design of steel structures — Part 1-6: General rules — Supplementary rules for the strength and stability of shell structures ENV 1993-4-2:1999, Eurocode 3: Design of steel structures — Part 4-2: Silos, tanks and pipelines — Tanks EN 1994-1-1, Eurocode 4: Design of composite steel and concrete structures — Part 1-1: General rules and rules for buildings EN 10025:2004 (all parts), Hot rolled products of non-alloy structural steels EN 10029:1991, Hot rolled steel plates 3 mm thick or above — Tolerances on dimensions, shape and mass
EN 10045-1, Metallic materials — Charpy impact test — Part 1: Test method EN 10160:1999, Ultrasonic testing of steel flat product of thickness equal or greater than 6 mm (reflection method) EN 10204:2004, Metallic products — Types of inspection documents EN 10216-1, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties EN 10216-2, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties EN 10216-3, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 3: Alloy fine grain steel tubes EN 10216-4, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 4: Non-alloy and allow steel tubes with specified low temperature properties EN 10217-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties EN 10217-2, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 2: Electric welded non-alloy and alloy steel tubes with specified elevated temperature properties EN 10217-3, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 3: Alloy fine grain steel tubes EN 10217-4, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 4: Electric welded non-alloy steel tubes with specified low temperature properties EN 10217-5, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 5: Submerged arc welded non-alloy and alloy steel tubes with specified elevated temperature properties



EN 14620-2:2006 (E) 7 EN 10217-6, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 6: Submerged arc welded non-alloy steel tubes with specified low temperature properties EN 10220, Seamless and welded steel tubes — Dimensions and masses per unit length EN 12062:1997, Non-destructive examination of welds — General rules for metallic materials EN 14015:2004, Specification for the design and manufacture of site built, vertical, cylindrical, flat- bottomed, above ground, welded, steel tanks for the storage of liquids at ambient temperature and above EN 14620-1:2006, Design and manufacture of site built, vertical, cylindrical, flat-bottomed steel tanks for the storage of refrigerated, liquefied gases with operating temperatures between 0°C and −165 °C — Part 1: General EN ISO 5817:2003, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003) EN ISO 15607:2003, Specification and qualification of welding procedures for metallic materials — Part 1: General rules (ISO 15607:2003) EN ISO 15609-1:2004, Specification and qualification of welding procedures for metallic materials — Welding procedure specification — Part 1: Arc welding (ISO 15609-1:2004) EN ISO 15614-1:2004, Specification and qualification of welding procedures for metallic materials — Welding procedure test — Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1:2004) ISO 261, ISO general purpose metric screw threads — General plan ISO 965-2:1998, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general purpose external and internal screw threads — Medium quality API 620:2004, Design and construction of large, welded, low-pressure storage tanks 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 14620-1:2006 and the following apply. 3.1 amplitude of strain one half of the range of strains 3.2 progressive deformation phenomenon in which the deformations in each part of the membrane increase progressively under the cyclic loads 3.3 range of strain difference between the maximum and minimum values in the cyclic strain curves 3.4 ratcheting progressive incremental inelastic deformation or strain, which can occur in a component that is subject to variation of mechanical stress



EN 14620-2:2006 (E) 8 3.5 unstable collapse phenomenon in which the assessment of the process of deformation under static load becomes ambiguous 4 Materials 4.1 General The temperature to which the steel may be exposed under all conditions is important, and shall be determined. 4.2 Temperatures 4.2.1 Minimum design temperature The minimum design temperature shall be used as the design metal temperature for material selection of the primary and secondary liquid container. 4.2.2 Lodmat The purchaser shall specify the lodmat. 4.2.3 Design metal temperature When a steel component is protected from the low liquid or vapour temperature by thermal insulation, the design metal temperature shall be calculated based on the most pessimistic assumption under that loading (accidental actions included). 4.3 Primary and secondary liquid container 4.3.1 Steel selection 4.3.1.1 General The material requirements for the primary and secondary liquid container given in 4.3.1.2 have been selected primarily for their high level of toughness at the design metal temperature. For each product to be stored, specific material requirements are specified. 4.3.1.2 Material requirements 4.3.1.2.1 Steel classification Plate materials shall be classified as follows:  type I steel: low temperature carbon-manganese steel;  type II steel: special low temperature carbon-manganese steel;  type III steel: low nickel steel;  type IV steel: improved 9 % nickel steel;  type V steel: austenitic stainless steel.



EN 14620-2:2006 (E) 9 For each product to be stored, the steel types shall be in accordance with Table 1. Table 1 — Product and steel class Product Single containment tank Double, or full
containment tank Membrane tank Typical product storage temperature Butane Type II Type I
- 10 °C Ammonia Type II Type II
- 35 °C Propane/ Propylene Type III Type II Type V - 50 °C Ethane/Ethylene Type IV Type IV Type V - 105 °C LNG Type IV Type IV
Type V - 165 °C NOTE
Service related effects, such as stress corrosion cracking, should be considered during material selection.
4.3.1.2.2 General requirements The following general requirements shall apply: a) Type I steel: A Type I steel is a fine-grained, low carbon steel, which shall be specified for pressure purposes at temperatures down to - 35 °C. The steel shall meet the following requirements: 1) The steel shall be specified to meet the requirements of an established European Standard (e.g. EN 10028-3). Steels with a minimum yield strength greater than 355 N/mm2 shall not be used. 2) The steel shall be in the normalized condition or produced by a thermo mechanical rolled process. 3) The carbon content shall be less than 0,20 %. The carbon equivalent Ceq shall be equal to or less than 0,43 with ()()eqCrMoVNiCuMnC=C6515++++++ b) Type II steel: A Type II steel is a fine-grained low carbon steel, which shall be specified for pressure purposes at temperatures down to - 50 °C. The steel shall meet the following requirements: 1) The steel shall be specified to meet the requirements of an established European Standard (e.g. EN 10028-3). Steels with a minimum yield strength greater than 355 N/mm2 shall not be used. 2) The steel shall be in the normalized condition or produced by a thermo mechanical rolled process. 3) The carbon content shall be less than 0,20 %. The carbon equivalent Ceq shall be equal to or less than 0,43 with



EN 14620-2:2006 (E) 10 ()()eqCrMoVNiCuMnC=C6515++++++ c) Type III steel: A Type III steel is a fine-grained low nickel alloy steel, which shall be specified for pressure purposes at temperatures down to - 80 °C. The steel shall meet the following requirements: 1) The steel shall be specified to meet the requirements of an established European Standard (e.g. EN 10028-4); 2) The steel shall have been heat treated to obtain a fine, uniform grain size or produced by a thermo mechanical rolled process. d) Type IV steel: A Type IV steel is an improved 9 % -nickel steel, which shall be specified for pressure purposes at temperatures down to - 165 °C. The steel shall meet the following requirements: 1) The steel shall be specified to meet the requirements of an established European Standard (e.g. EN 10028-4); 2) The steel shall be quenched and tempered. e) Type V steel: Type V steel is an austenitic stainless steel according to a European Standard
(e.g. EN 10028-7). 4.3.1.2.3 Maximum shell plate thickness The maximum shell plate thickness shall be:  Types I, II and III: 40 mm;  Types IV: 50 mm;  Type V: no upper limit on thickness. When material thickness is required in excess of these values, additional material investigation and testing shall be carried out to demonstrate that the same level of resistance to brittle fracture is available as would be required for the type of material and maximum thickness indicated above. 4.3.1.2.4 Plate tolerances The plate tolerances shall be:  in accordance with EN 10029:1991, Class C, for parts where the thickness is established by calculation;  in accordance with EN 10029:1991, Class B, for parts where the thickness is based on minimum nominal thickness considerations.



EN 14620-2:2006 (E) 11 4.3.2 Charpy V-notch impact test requirements The Charpy V-notch impact test values for base material, heat-affected zone (HAZ) and weld metal shall be in accordance with Table 2. The values specified shall be the minimum average of three specimens, with only one value less than the value specified, but not less than 70 % of the value specified. For material thickness less than 11 mm, the largest practical sub-size specimen shall be used. The minimum Charpy V-notch impact test va
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