SIST EN 14398-2:2004+A2:2008

Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing

This European Standard specifies requirements for the design, fabrication, inspection and testing of large transportable non vacuum insulated cryogenic vessels of more than 1000 l volume, which are permanently (fixed tanks) or not permanently (demountable tanks) attached to a vehicle, for carriage by road. However, it can be used for other mode of transport providing the specific regulations/requirements are complied with.
This European Standard applies to large transportable non vacuum insulated cryogenic vessels for fluids specified in EN  14398-1 and does not apply to vessels designed for toxic fluids.
This European Standard does not include the general vehicle requirements e.g. running gear, brakes, lighting etc. that shall be in accordance with the relevant standards/regulations.

Kyo-Behälter - Große ortsbewegliche, nicht vakuum-isolierte Behälter - Teil 2: Bemessung, Herstellung und Prüfung

Récipients cryogéniques - Grands récipients transportables non isolés sous vide - Partie 2: Conception, fabrication, inspections et essais

La présente Norme européenne spécifie des exigences en matière de conception, fabrication, contrôle et essais de
grands récipients cryogéniques transportables non isolés sous vide d’un volume supérieur à 1 000 l, fixés sur un
véhicule de manière permanente (réservoirs fixes) ou non (réservoirs démontables) pour le transport routier. Elle
peut cependant être utilisée pour d’autres modes de transport à condition que soient respectées les lois et
exigences correspondantes.
La présente Norme européenne s'applique aux grands récipients cryogéniques transportables non isolés sous vide
pour les fluides spécifiés dans l’EN 14398-1 et ne s'applique pas à des récipients prévus pour contenir des
fluides toxiques.
La présente Norme européenne ne couvre pas les exigences générales relatives aux véhicules, par exemple, les
organes de roulement, les freins, les feux, etc., qui doivent être conformes aux normes/règlements correspondants.

Kriogene posode - Velike premične, vakuumsko neizolirane posode - 2. del: Konstruiranje, izdelava, kontrola in preskus

General Information

• Status: Published
• Publication Date: 06-Apr-2008
• ICS: 23.020.40 - Cryogenic vessels
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2008
• Due Date: 06-Jun-2008
• Completion Date: 07-Apr-2008
• Directive: 2008/68/EC - Directve 2008/68/EC of the European Parliament and of the council of 24 September 2008 on the inland transport of the dangerous goods
• Mandate: M/086 - Mandate to CEN for standardization in the field of transport of dangerous goods
• Ref Project: EN 14398-2:2003+A2:2008 - Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing

Relations

• Replaces: SIST EN 14398-2:2004/A1:2007 - Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing
• Effective Date: 01-Jun-2008
• Consolidates: SIST EN 14398-2:2004/A1:2007 - Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing
• Effective Date: 18-Jan-2023
• Consolidates: SIST EN 14398-2:2004/AC:2007 - Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing
• Effective Date: 01-Jun-2008
• Consolidates: SIST EN 14398-2:2004 - Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing
• Effective Date: 01-Jun-2008

Overview

EN 14398-2:2003+A2:2008 is a CEN European Standard that specifies requirements for the design, fabrication, inspection and testing of large transportable non‑vacuum insulated cryogenic vessels (volume > 1000 L) intended for carriage by road. It covers both permanently fixed tanks and demountable tanks mounted on vehicles. The standard applies to cryogenic fluids listed in EN 14398‑1, excludes vessels for toxic fluids, and does not include general vehicle requirements (running gear, brakes, lighting).

Key Topics and Technical Requirements

This part of EN 14398 sets out detailed technical requirements and supporting annexes. Major topics include:

• Design methods: options include design by calculation, calculation with pressure‑strengthening, and calculation supplemented by experimental methods.
• Structural design requirements: load cases, fatigue considerations, corrosion allowance, inspection openings, and electrical continuity.
• Pressure protection and valves: pressure relief arrangements and valve requirements for safe operation of cryogenic tanks.
• Insulation and filling rules: guidance on non‑vacuum insulation and degree of filling for safe transport.
• Materials and special steels: provisions and additional requirements (Annex B) for 9% Ni steel, and pressure strengthening practice for austenitic stainless steels (Annex C).
• Fabrication processes: cutting, cold/hot forming, tolerances, welding qualification and acceptance of welded and non‑welded joints.
• Inspection & testing: mandatory quality plan, production control test plates, non‑destructive testing (surface and volumetric examinations), rectification, and pressure testing.
• Analysis guidance: elastic stress analysis and stress categorization are provided (Annex A), plus normative annexes for material‑specific procedures.

Applications and Typical Users

EN 14398‑2 is used where consistent safety and reliability of large transportable cryogenic tanks are required:

• Manufacturers of transportable cryogenic vessels and demountable tanks
• Design engineers performing structural and pressure design for road‑carried cryogenic tanks
• Welding and fabrication shops implementing qualified procedures
• Inspection bodies and notified/competent authorities carrying out conformity assessments, NDT and pressure tests
• Fleet operators, logistics companies and equipment purchasers specifying compliance with CEN standards for safe carriage of cryogenic fluids

Keywords: EN 14398-2, cryogenic vessels, large transportable non‑vacuum insulated vessels, design fabrication inspection testing, CEN standard, transportable cryogenic tanks, 9% Ni steel, austenitic stainless steel.

Related Standards

• EN 14398‑1 - lists applicable cryogenic fluids and complements Part 2.
• National and international vehicle regulations (for running gear, brakes, lighting) - compliance required but not covered by this standard.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testingRécipients cryogéniques - Grands récipients transportables non isolés sous vide - Partie 2: Conception, fabrication, inspections et essaisKyo-Behälter - Große ortsbewegliche, nicht vakuum-isolierte Behälter - Teil 2: Bemessung, Herstellung und PrüfungTa slovenski standard je istoveten z:EN 14398-2:2003+A2:2008SIST EN 14398-2:2004+A2:2008en,fr23.020.40ICS:SLOVENSKI
STANDARDSIST EN 14398-2:2004+A2:200801-junij-2008

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14398-2:2003+A2
March 2008 ICS 23.020.40 Supersedes EN 14398-2:2003English Version
Cryogenic vessels - Large transportable non-vacuum insulated vessels - Part 2: Design, fabrication, inspection and testing
Récipients cryogéniques - Grands récipients transportables non isolés sous vide - Partie 2: Conception, fabrication, inspections et essais
Kyo-Behälter - Große ortsbewegliche, nicht vakuum-isolierte Behälter - Teil 2: Bemessung, Herstellung und Prüfung This European Standard was approved by CEN on 10 July 2003 and includes Corrigendum 1 issued by CEN on 23 August 2006, Amendment 1 approved by CEN on 6 October 2006 and Amendment 2 approved by CEN on 7 February 2008.
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 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 Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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 © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14398-2:2003+A2:2008: E

Elastic stress analysis.67 A.1 General.67 A.2 Terminology.67 A.2.1 Stress intensity.67 A.2.2 Gross structural discontinuity.68 A.2.3 Local structural discontinuity.68 A.2.4 Normal stress.68 A.2.5 Shear stress.68 A.2.6 Membrane stress.68 A.2.7 Primary stress.69 A.2.8 Primary local membrane stress.69 A.2.9 Secondary stress.69 A.2.10 Peak stress.69 A.3 Limit for longitudinal compressive general membrane stress.69 A.4 Stress categories and stress limits for general application.70 A.4.1 General.70 A.4.2 General primary membrane stress category.70 A.4.3 Local primary membrane stress category.70 A.4.4 General or local primary membrane plus primary bending stress category.70 A.4.5 Primary plus secondary stress category.70 A.4.6 Thermal stress.70 A.5 Specific criteria, stress categories and stress limits for limited application.71 A.5.1 General.71 A.5.2 Attachments and supports.71 A.5.3 Nozzles and openings.71 A.5.4 Additional stress limits.72 Annex B (normative)
Additional requirements for 9 % Ni steel.76 B.1 Introduction.76 B.2 Specific requirements.76 Annex C (normative)
Pressure strengthening of vessels from austenitic stainless steels.78 C.1 Introduction.78 C.2 Scope.78 C.3 Definitions and units of measurement.78 C.4 Materials.79 C.5 Design.80 C.5.1 General.80 C.5.2 Design for internal pressure.80 C.6 Manufacturing and inspection.83 C.6.1 Strengthening procedure.83 C.6.2 Procedure record.83 C.6.3 Welding.83 C.6.4 Pressure vessel drawing.84 C.6.5 Data plate.84 C.7 Comments.84 C.7.1 Strengthening theory.84 C.7.2 Work-hardened material.86

Specific weld details.90 D.1 Field of application.90 D.2 Weld detail.90 D.2.1 Joggle joint.90 D.2.2 Intermediate ends.90 D.2.3 Backing strip.91 D.2.4 End plate closure.91 D.2.5 Non full penetration nozzle weld.91 D.2.6 Non continuous fillet weld on attachments.91 D.3 Oxygen service requirements.91 Annex E (normative)
Increased material property for austenitic stainless steel.95 Bibliography.96

– Part 2: Design, fabrication, inspection and testing
– Part 3: Operational requirements
#Annexes B, C and E are normative. Annexes A and D are normative.$ This document includes a Bibliography. 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, 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.

14398-1 and does not apply to vessels designed for toxic fluids. This European Standard does not include the general vehicle requirements e.g. running gear, brakes, lighting etc. that shall be in accordance with the relevant standards/regulations. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). EN 287-1, Approval testing of welders - Fusion welding - Part 1: Steels. #deleted text$ EN 473, Non destructive testing - Qualification and certification of NDT personnel - General principles. EN 875, Destructive tests on welds in metallic materials - Impact tests - Test specimen location, notch orientation and examination. EN 895, Destructive tests on welds in metallic materials - Transverse tensile test. EN 910, Destructive tests on welds in metallic materials – Bend tests. EN 1252-1:1998, Cryogenic vessels - Materials - Part 1: Toughness requirements for temperatures below - 80 °C. EN 1252-2, Cryogenic vessels - Materials - Part 2: Toughness requirements for temperatures between – 80 °C and –20 °C. EN 1418, Welding personnel – Approval testing of welding operators for fusion welding and resistance weld setters for fully mechanised and automatic welding of metallic materials. EN 1435, Non-destructive examination of welds – Radiographic examination of welded joints. EN 1626, Cryogenic vessels - Valves for cryogenic service. EN 1797, Cryogenic vessels - Gas/material compatibility. EN 10028-4, Flat products made of steels for pressure purposes – Part 4: Nickel alloy steels with specified low temperature properties. EN 10028-7:2000, Flat products made of steels for pressure purposes - Part 7: Stainless steels. EN 13068-3, Non-destructive testing – Radioscopic testing – Part 3: General principles of radioscopic testing of metallic materials by X – and gamma rays. EN 13445-3, Unfired pressure vessels – Part 3: Design.

Part 1: Fusion welding !(ISO 6520-1:2007)". #EN ISO 9606-2, Qualification test of welders - Fusion welding - Part 2: Aluminium and aluminium alloys
(ISO 9606-2:2004). EN ISO 15613, Specification and qualification of welding procedures for metallic materials - Qualification based on pre-production welding test (ISO 15613:2004). EN ISO 15614-1, 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). EN ISO 15614-2, Specification and qualification of welding procedures for metallic materials - Welding procedure test - Part 2: Arc welding of aluminium and its alloys (ISO 15614-2:2005).$ ISO 1106-1, Recommended practice for radiographic examination of fusion welded joints - Part 1: Fusion welded butt joints in steel plates up to 50 mm thick. 3 Terms, definitions and symbols For the purposes of this European Standard, the following terms, definitions and symbols apply. 3.1 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 14398-1:2003 and the following apply. 3.1.1 large transportable non vacuum insulated vessel vessel of more than 1000 l volume intended for one or more cryogenic fluids, consisting of an inner vessel, an insulation, all of the valves and accessories and additional framework 3.1.2 fixed tank (tank vehicle) large transportable vessel permanently attached to a vehicle or to units of running gear used in its stead 3.1.3 demountable tank large transportable vessel non permanently attached to a vehicle. When attached to the carrier vehicle, the demountable tank meets the requirements prescribed for a fixed tank. It is designed to be lifted only when empty 3.1.4 inner vessel pressure vessel proper intended to contain the cryogenic fluid 3.1.5 insulation to protect the vessel against heat transfer from the outside atmospheric temperature

EN 1252-1 or EN 1252-2. In the case of 9 % Ni steel, the additional requirements of annex B shall be satisfied. For carbon and low alloy steels the requirements of EN 1252-2 shall be satisfied. 4.1.2 Design by calculation Calculation of all pressure and load bearing components shall be carried out. The pressure part thicknesses of the vessel shall not be less than required by 4.3. Additional calculations may be required to ensure the design is satisfactory for the operating conditions including an allowance for dynamic loads. 4.1.3 Design by calculation and pressure strengthening The pressure retaining capability of vessels manufactured from austenitic stainless steel, strengthened by pressure, shall be calculated in accordance with annex C.

vessel itself or the protective frame, if any, are concerned ; the initial design programme shall be repeated to take account of these modifications. 4.2.2 Design specification To enable the design to be prepared the following information which defines a vessel type shall be available :  maximum allowable pressure ;  fluids intended to be used ;  liquid capacity ;  dimensions and allowable weight, taking characteristics of the vehicle into account ;  location of fastening points and loads allowable on these points ;  filling and emptying rate ;  range of ambient temperature, if differing from 7.2 of EN 14398-1:2003. A design document in the form of drawings with text if any shall be prepared, it shall contain the information given above plus the following where applicable :  definition of which components are designed by calculation, by pressure strengthening, by experiment and by satisfactory in service experience ;

is the maximum allowable pressure, in bar. The vessel shall be capable of holding the pressure test fluid without plastic deformation. b) pressure during operation, pC, where : LCppps+= (2)

is the pressure, in bars, exerted by the mass of the liquid contents when the vessel is filled to capacity and subject to each load defined in 4.2.3.1, with either : 1) boiling liquid at minimum allowable temperature 2) cryogenic fluid at its equilibrium triple point or melting point temperature; c) reaction at the support points of the vessel due to the mass of the vessel and its contents when subject to each of the loads defined in 4.2.3.1 ; d) load imposed by the piping due to the differential thermal movement of the vessel, the piping and the insulation. The following cases shall be considered :  cooldown
(vessel warm - piping cold) ;
 filling and withdrawal (vessel cold - piping cold) ; and  transport and storage (vessel cold - piping warm) ; e) load imposed on the vessel at its support points when cooling from ambient to operating temperature and during operation. 4.2.3.3 Self supporting vessels In the case of vehicles in which the vessel constitute stressed self-supporting members of the vehicle, these shall be designed to withstand the stresses thus imposed in addition to stresses from other sources, (see 4.2.3.2 c). 4.2.3.4 Vessel supports The vessel supports shall be suitable for each load defined in 4.2.3.2 c) plus loads due to differential thermal movements. 4.2.3.5 Surge plates The vessel shall be divided by surge plates to provide stability and limit dynamic loads to the requirements of 4.2.3, unless it is to be filled equal to or more than 80 % of its capacity or nominally empty. The cross sectional area of the surge plate shall be at least 70 % of that of the vessel. Current experience with surge plates limiting the capacity to 7 500 l has been shown to meet these requirements. Surge plates and their attachments to the shell shall be designed to resist the stresses caused by a pressure evenly distributed across the area of the surge plate. The pressure is calculated by considering the mass of liquid between the plates decelerating at 2 g (4.2.3). 4.2.3.6 Fastening points Fastening points shall be suitable for fastening the large transportable cryogenic vessel to the vehicle when filled to capacity and subject to each of the loads defined in 4.2.3. 4.2.3.7 Protection of upper fittings The fittings and accessories mounted on the upper part of the vessel shall be protected in such a way that damage caused by overturning cannot impair operational integrity. This protection may take the form of strengthening rings, protective canopies or transverse or longitudinal members so shaped that effective protection is given.

Due to the combination of materials of construction and operating fluids, internal corrosion cannot occur.

A device shall protect the vessel against excess pressure due to : a) normal heat leak,
and the devices acting together shall protect the vessel against excess pressure due to ; b) heat leak with loss of insulation c) heat leak, without loss of insulation, and the pressure build up system being in the open position. d) recycling of any possible combination of pumps Excess pressure means a pressure in excess of 110 % of the maximum allowable pressure for condition a) + d) and in excess of the test pressure for condition b) and in excess of the test pressure for condition c). Relief devices for the vessel shall be in accordance with EN 13648-3 for calculation of sizing. The pressure relief system shall be sized so that the pressure drop during discharge does not cause the valve to reseat instantly. 4.2.7.2 Piping Any section of pipework containing cryogenic fluid which can be isolated shall be protected by a relief valve or other suitable relief device. 4.2.8 Valves Valves shall conform to EN 1626. 4.2.9 Insulation To protect the vessel against heat transfer from the outside atmospheric temperature. The insulation consists of a material with low heat transfer values of a certain thickness, which protects the cold liquid content of the vessel from quick increase of the pressure. The insulation shall be covered by an outside cladding, to protect the insulation against collection of humidity or water and against damage. The insulation material can be polyurethane foam (injected or moulded as formed plates), etc. 4.2.10 Degree of filling The degree of filling of large transportable non vacuum insulated vessels intended for the carriage of flammable gases shall remain below the level at which, if the contents were raised to the temperature at which the vapour pressure equalled the opening pressure of the safety valve, the volume of the liquid would reach 95 % of the vessel’s capacity at that temperature. Large transportable non vacuum insulated vessels may be filled with non-flammable gases to 98 % of its total volume at the loading temperature and the loading pressure. Means shall be provided to ensure that the above limits are not exceeded.
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