LPG equipment and accessories - Equipping of LPG road tankers

This European Standard specifies equipment and accessories for road tankers used for the transport of Liquefied Petroleum Gas (LPG) and identifies the equipment that is considered necessary to ensure that filling, transportation and discharge operations can be carried out safely. It specifies the requirements for the assembly of the accessories and the vehicle LPG equipment to the road tanker. This European Standard also identifies additional equipment and accessories that can be used on road tankers carrying LPG. This European Standard does not preclude the use of alternative designs, materials and equipment testing which provide the same or a higher level of safety. ADR [9] requires that such alternative technical codes be recognised by the competent authority, provided that the minimum requirements of section 6.8.2 of ADR [9] are complied with. This European Standard does not apply to “tank-containers” or “battery-vehicles” used for the transport of LPG.

Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung von Straßentankwagen für Flüssiggas (LPG)

Diese Europäische Norm legt die Ausrüstung und Ausrüstungsteile von Straßentankwagen fest, die für die Beförderung von Flüssiggas (LPG) eingesetzt werden, und gibt die für die sichere Durchführung von Füll-, Beförderungs- und Entleerungsvorgängen erforderliche Ausrüstung an. Sie legt die Anforderungen an die Montage der Ausrüstungsteile und der LPG-Fahrzeugausrüstung an den Straßentankwagen fest. Diese Europäische Norm gibt ebenfalls zusätzliche Ausrüstung und Ausrüstungsteile an, die auf mit LPG beladenen Straßentankwagen verwendet werden kann.
Diese Europäische Norm schließt die Verwendung alternativer Auslegungen, Werkstoffe und Ausrüstungen nicht aus, sofern diese das gleiche oder ein höheres Sicherheitsniveau aufweisen. Das ADR [9] fordert, dass ein solches alternatives technisches Regelwerk durch die zuständige Behörde anerkannt werden muss, wobei dabei vorausgesetzt wird, dass die in Abschnitt 6.8.2 des ADR [9] angegebenen Mindestanforderungen durch dieses Regelwerk erfüllt werden.
Diese Europäische Norm gilt nicht für ebenfalls zur Beförderung von LPG verwendete „Tankcontainer“ oder „Batteriefahrzeuge“.

Equipements pour GPL et leurs accessoires - Equipements des camions citernes pour GPL

La présente Norme européenne spécifie les équipements et accessoires pour camions-citernes destinés au transport de gaz de pétrole liquéfié (GPL) et identifie les équipements considérés comme nécessaires pour que les opérations de remplissage, de transport et de déchargement puissent être effectuées en toute sécurité. Elle spécifie les exigences relatives à l’assemblage des accessoires et des équipements GPL du véhicule sur le camion-citerne. La présente Norme européenne identifie également les équipements et accessoires supplémentaires qui peuvent être utilisés sur des camions-citernes destinés au transport de GPL
La présente Norme européenne n’exclut pas l’utilisation de conceptions, matériaux et essais d’équipements qui garantissent au moins le même niveau de sécurité. L’ADR [9] exige que de tels codes techniques soient reconnus par l’autorité compétente à condition que les exigences minimales du paragraphe 6.8.2 de l’ADR [9] soient satisfaites.
La présente Norme européenne ne s’applique pas aux « conteneurs-citernes », ni aux « véhicules batteries » utilisés pour le transport de GPL.

Oprema in pribor za utekočinjeni naftni plin (UNP) - Oprema cestnih cistern za utekočinjeni naftni plin (UNP)

Ta evropski standard določa opremo in pribor za cestne cisterne, ki se uporabljajo za prevoz utekočinjenega naftnega plina (UNP), ter identificira opremo, ki je obvezna za varno izvajanje operacij polnjenja, prevoza in praznjenja. Določa zahteve za pritrjevanje pribora in opreme za vozilo za utekočinjen naftni plin na cestno cisterno. Ta evropski standard določa tudi dodatno opremo in pribor, ki se lahko uporablja na cestnih cisternah za prevoz utekočinjenega naftnega plina. Ta evropski standard ne izključuje uporabe alternativnih preskušanj zasnove, materialov in opreme, ki zagotavljajo enako ali večjo raven varnosti. ADR [9] zahteva, da takšne alternativne tehnične kode priznava pristojni organ, in sicer v skladu z minimalnimi zahtevami razdelka ADR 6.8.2 [9]. Ta evropski standard ne velja za »cisterne zabojnike« ali »baterijska vozila«, ki se uporabljajo za prevoz utekočinjenega naftnega plina.

General Information

Status
Withdrawn
Public Enquiry End Date
30-Nov-2013
Publication Date
08-Jun-2014
Withdrawal Date
15-Aug-2022
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
03-Aug-2022
Due Date
26-Aug-2022
Completion Date
16-Aug-2022

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung von Straßentankwagen für Flüssiggas (LPG)Equipements pour GPL et leurs accessoires - Equipements des camions citernes pour GPLLPG equipment and accessories - Equipping of LPG road tankers43.080.10Tovornjaki in priklopnikiTrucks and trailers23.020.20Posode in vsebniki, montirani na vozilaVessels and containers mounted on vehiclesICS:Ta slovenski standard je istoveten z:EN 12252:2014SIST EN 12252:2014en,fr,de01-julij-2014SIST EN 12252:2014SLOVENSKI

STANDARDSIST EN 12252:20121DGRPHãþD
SIST EN 12252:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12252
April 2014 ICS 43.080.10 Supersedes EN 12252:2012English Version
LPG equipment and accessories - Equipping of LPG road tankers

Équipements pour GPL et leurs accessoires - Équipements des camions citernes pour GPL

Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung von Straßentankwagen für Flüssiggas (LPG) This European Standard was approved by CEN on 9 February 2014.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

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

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12252:2014 ESIST EN 12252:2014

EN 12252:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................3 Introduction .........................................................................................................................................................4 1 Scope ......................................................................................................................................................5 2 Normative references ............................................................................................................................5 3 Terms and definitions ...........................................................................................................................7 4 Requirements .........................................................................................................................................9 4.1 General ....................................................................................................................................................9 4.2 Equipment ..............................................................................................................................................9 4.3 Valve access ........................................................................................................................................ 10 5 Pressure vessel................................................................................................................................... 10 5.1 Design and manufacture .................................................................................................................... 10 5.2 Mounting of pressure vessel on road tanker ................................................................................... 10 6 Pressure vessel accessories ............................................................................................................. 11 6.1 Required pressure vessel accessories ............................................................................................ 11 6.2 Optional pressure vessel accessories ............................................................................................. 12 7 Vehicle LPG equipment ...................................................................................................................... 12 7.1 Mandatory LPG equipment ................................................................................................................ 12 7.2 Optional LPG equipment .................................................................................................................... 13 8 Equipment specifications .................................................................................................................. 14 8.1 Suitable materials ............................................................................................................................... 14 8.2 Contents gauge ................................................................................................................................... 15 8.3 Pressure gauge ................................................................................................................................... 15 8.4 Temperature gauge............................................................................................................................. 15 8.5 Pump .................................................................................................................................................... 16 8.6 Hoses ................................................................................................................................................... 16 8.7 Hose reel .............................................................................................................................................. 16 8.8 Earth reel ............................................................................................................................................. 17 8.9 Metering system.................................................................................................................................. 17 8.10 Valves ................................................................................................................................................... 17 8.11 Pressure relief valves(PRV) ............................................................................................................... 17 9 Assembly ............................................................................................................................................. 17 9.1 General ................................................................................................................................................. 17 9.2 Welding ................................................................................................................................................ 18 9.3 Flanged connections .......................................................................................................................... 18 9.4 Screwed connections ......................................................................................................................... 18 9.5 External corrosion protection ........................................................................................................... 18 10 Inspection and testing ........................................................................................................................ 18 10.1 General ................................................................................................................................................. 18 10.2 Hydraulic pressure test ...................................................................................................................... 19 10.3 Leak test .............................................................................................................................................. 19 11 Safety systems .................................................................................................................................... 19 11.1 General ................................................................................................................................................. 19 11.2 Emergency Shut-Down system(ESD) ............................................................................................... 20 12 General safety requirements ............................................................................................................. 20 Annex A (normative) Discharge rates for pressure relief valves-Discharge capacity ............................. 21 Annex B (informative) Calculation of mountings of pressure vessel to the chassis ............................... 23 Annex C (informative) Environmental Checklist .......................................................................................... 30 Bibliography ..................................................................................................................................................... 31 SIST EN 12252:2014

EN 12252:2014 (E) 3 Foreword This document (EN 12252:2014) has been prepared by Technical Committee CEN/TC 286 “Liquefied Petroleum Gas equipment and accessories”, the secretariat of which is held by NSAI. 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 October 2014 and conflicting national standards shall be withdrawn at the latest by October 2014. 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 12252:2012. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This document has been submitted for reference into the technical annexes of the ADR [9]. NOTE These regulations take precedence over any clause of this European Standard. It is emphasised that RID/ADR/ADN are being revised regularly at intervals of two years which might lead to temporary non-compliances with the clauses of this European Standard. The main technical changes of this revision include: — the update of definitions; — the modification of requirements on the primary shut-off system (see 6.1.3); — the modification of the general requirements on the safety system (see 11.1); — the correction of an error in the flow calculation units (see Annex A). 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12252:2014

EN 12252:2014 (E) 4 Introduction This European Standard calls for the use of substances and procedures that may be injurious to health and also the environment if adequate precautions are not taken. It refers only to technical suitability; it does not absolve the user from their legal obligations at any stage. Protection of the environment is a key political issue in Europe and elsewhere around the world. Protection of the environment in this document is understood in a very broad sense. The phrase is used, for example, in relation to the total life-cycle aspects of a product on the environment, including expenditure of energy, and during all phases of its existence, from mining of raw materials, fabrication, packaging, distribution, use, scrapping, recycling of materials, etc. NOTE 1 Annex C comprises an environmental checklist which highlights the clauses of this European Standard that address environmental issues. Provisions need to be restricted to a general guidance. Limit values are specified in national laws. It is recommended that manufacturers develop an environmental management policy. For guidance see the ISO 14000 series [3], [4] and [5] It has been assumed in the drafting of this European Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people. All pressures are gauge pressures unless otherwise stated. NOTE 2 This European Standard requires measurement of material properties, dimensions and pressures. All such measurements are subject to a degree of uncertainty due to tolerances in measuring equipment etc. It might be beneficial to refer to the leaflet “measurement uncertainty leaflet” SP INFO 2000 27 [10]. SIST EN 12252:2014

EN 12252:2014 (E) 5 1 Scope This European Standard specifies equipment and accessories for road tankers used for the transport of Liquefied Petroleum Gas (LPG) and identifies the equipment that is considered necessary to ensure that filling, transportation and discharge operations can be carried out safely. It specifies the requirements for the assembly of the accessories and the vehicle LPG equipment to the road tanker. This European Standard also identifies additional equipment and accessories that can be used on road tankers carrying LPG. This European Standard does not preclude the use of alternative designs, materials and equipment testing which provide the same or a higher level of safety. ADR [9] requires that such alternative technical codes be recognised by the competent authority, provided that the minimum requirements of section 6.8.2 of ADR [9] are complied with. This European Standard does not apply to “tank-containers” or “battery-vehicles” used for the transport of LPG. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment EN 558, Industrial valves — Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems — PN and Class designated valves EN 837-2, Pressure gauges —Part 2: Selection and installation recommendations for pressure gauges EN 1012-1, Compressors and vacuum pumps — Safety requirements — Part 1: Air compressors EN 1591-1, Flanges and their joints — Design rules for gasketed circular flange connections — Part 1: Calculation method EN 1762, Rubber hoses and hose assemblies for liquefied petroleum gas, LPG (liquid or gaseous phase), and natural gas up to 25 bar (2,5 MPa) — Specification EN 1983, Industrial valves — Steel ball valves EN 1984, Industrial valves — Steel gate valves EN 10025 (all parts), Hot rolled products of structural steels EN 10028 (all parts), Flat products made of steels for pressure purposes 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 10217-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties SIST EN 12252:2014

EN 12252:2014 (E) 6 EN 12074, Welding consumables — Quality requirements for manufacture, supply and distribution of consumables for welding and allied processes EN 12493, LPG equipment and accessories — Welded steel pressure vessels for LPG road tankers — Design and manufacture EN 12627, Industrial valves — Butt welding ends for steel valves EN 12760, Valves — Socket welding ends for steel valves EN 13175, LPG equipment and accessories — Specification and testing for Liquefied Petroleum Gas (LPG) tank valves and fittings EN 13709, Industrial valves — Steel globe and globe stop and check valves EN 13789, Industrial valves — Cast iron globe valves EN 13799, LPG equipment and accessories — Contents gauges for Liquefied Petroleum Gas (LPG) pressure vessels EN 14422, Clamp type coupling assemblies for liquefied petroleum gas (LPG) transfer hoses EN 14424, Hose fittings with screwed ferrules EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method (ISO 148-1) EN ISO 3834-2, Quality requirements for fusion welding of metallic materials — Part 2: Comprehensive quality requirements (ISO 3834-2) EN ISO 3834-3, Quality requirements for fusion welding of metallic materials — Part 3: Standard quality requirements (ISO 3834-3) EN ISO 9606-1, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1) EN ISO 10497, Testing of valves — Fire type-testing requirements (ISO 10497) EN ISO 14732, Welding personnel - Qualification testing of welding operators and weld setters for mechanized and automatic welding of metallic materials (ISO 14732) EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding procedure specification — Part 1: Arc welding (ISO 15609-1) 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) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 liquefied petroleum gas LPG low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011, UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane, butane isomers and butene with traces of other hydrocarbon gases SIST EN 12252:2014

EN 12252:2014 (E) 7 3.2 pressure vessel assembly of the pressure-retaining envelope (including the openings and their closures) and non-pressure-retaining parts attached directly to it 3.3 primary shut-off system valve or a series of valves attached to the pressure vessel which provides a method of sealing off the flow from the pressure vessel 3.4 vehicle LPG equipment equipment and pipework on the road tanker which is in contact with LPG and forms part of the LPG operating system, shut-down system or safety system, but which is not directly connected to the pressure vessel and is not part of the automotive LPG system 3.5 accessories device connected to the system the main function of which is not for the storage or conveyance of LPG Note 1 to entry: Referred to as “service and structural equipment” in ADR [9]. 3.6 thermowell permanently sealed pocket in the vessel/pipework for the temperature gauge 3.7 pipework pressure containing enclosure used for the conveyance of LPG, consisting of pipe, pipe fittings, valves and other accessories 3.8 road tanker vehicle with a fixed or demountable pressure vessel (tank) having only one compartment Note 1 to entry: Road tankers are referred to as fixed tanks (tank-vehicles) and demountable tanks in the ADR [9]. 3.9 thermal expansion valve self-closing valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges fluid at a predetermined pressure 3.10 non-return valve valve designed to close automatically to restrict reverse flow 3.11 excess flow valve valve designed to close automatically, with a small residual flow, when the fluid flow passing through it exceeds a predetermined value, and to re-open when the pressure differential across the valve has been restored below a certain value 3.12 shut-off valve valve to provide a leak-tight seal which is operated either manually, remotely or is self-closing SIST EN 12252:2014

EN 12252:2014 (E) 8 3.13 pressure relief valve PRV self-closing valve which automatically, without the assistance of any energy other than that of the vapour concerned, discharges vapour at a predetermined pressure, and operates with a pop action 3.14 design pressure DEPRECATED: calculation pressure pressure used for the calculation of the minimum wall thickness 3.15 gas-free less than 20 % of the lower explosive limit of LPG in air 3.16 competent person person which by combination of appropriate qualification, training, experience, and resources, is able to make objective judgments on the subject 3.17 fixed liquid level gauge gauging device used to indicate when a predetermined liquid level has been reached or surpassed, i.e. a dip tube in combination with a vent valve 3.18 competent authority authority designated as competent in each country in accordance with national regulations 4 Requirements 4.1 General 4.1.1 The complete road tanker, its equipment and accessories, shall withstand the anticipated mechanical, chemical and thermal stresses without leakage of LPG. NOTE ADR [9] requires that each new design of a road tanker (tank vehicle) including equipment to be approved by the competent authority. 4.1.2 Equipment and accessories shall be: — protected against accidental damage where such damage could lead to an unintended escape of LPG; — able to withstand dynamic stresses due to motion; — suitably protected if the road tanker rolls over; — arranged and protected against being wrenched off or damaged during operation; — suitable to withstand thermal expansion and contraction, mechanical shock and vibration; — designed to keep openings in the pressure vessel and associated pipework and accessories to a minimum; all other openings shall be fitted with suitable blanking plugs or flanges; and SIST EN 12252:2014

EN 12252:2014 (E) 9 — manufactured from materials which give the finished equipment the required mechanical properties, in particular, where equipment is subject to the low temperatures (including low temperatures caused by filling), suitably ductile material shall be used. 4.1.3 It is recommended that materials and components be acquired from suppliers who have a declared environmental policy (see EN ISO 14021, EN ISO 14024 and EN ISO 14025). 4.2 Equipment Mandatory and optional equipment to be fitted to LPG road tankers shall be in accordance with Table 1. Table 1 — Road tanker equipment Description Clauses Mandatory Optional Accessories Contents gauge 6.1.1 / 8.2 X

Pressure gauge 6.1.2 / 8.3 X
Primary shut-off system 6.1.3 X
Temperature gauge 6.2 / 8.4
X Pressure relief valve (PRV) 6.2 / 8.11
X Sun shield 6.2
X Vehicle LPG equipment Pipework 7.1.2 / 8.1.6 X
Emergency shut-down system 11.2 X
Hoses 7.1.3 / 8.6 X
Thermal expansion valves 7.1.4 X
Valves 8.10 X
Compressor 7.2
X Pump 7.2 / 8.5
X Hose reel 7.2 / 8.7
X Metering system 7.2 / 8.9
X Earth connection 7.1.5 X
Earth reel 7.2 / 8.8

X 4.3 Valve access Valves required for normal and emergency operation shall be readily accessible or remotely operated. 5 Pressure vessel 5.1 Design and manufacture The pressure vessel shall be designed and manufactured in accordance with EN 12493 or an equivalent standard. SIST EN 12252:2014

EN 12252:2014 (E) 10 5.2 Mounting of pressure vessel on road tanker 5.2.1 General The pressure vessel and fastenings to the structure of the road tanker shall be designed and constructed to absorb safely the stresses from normal use such as surge, vibration, braking action etc. 5.2.2 Mounting 5.2.2.1 The fixing of the pressure vessel to the road tanker shall be designed in accordance with a calculation based on the forces given in Table 2. NOTE A sample method of calculation for the mountings of the pressure vessel to the chassis is contained in Annex B. 5.2.2.2 The pressure vessel shall be electrically continuous with the chassis. The resistance of this

5.2.2.3 Where the pressure vessel, while on the chassis, will be subjected to a hydraulic test, during which the pressure vessel can contain 2,4 times the normal mass of its normal operating capacity, it shall be established that the chassis is capable of taking this mass without additional support. Table 2 — Forces for fixing the pressure vessel to the road tanker Direction of force Force N In the direction of travel 2 g × total mass of pressure vessel At right angles to the direction of travel 1 g × total mass of pressure vessel Vertical, upwards 1 g × total mass of pressure vessel Vertical, downwards 2 g × total mass of pressure vessel The total mass of the pressure vessel shall be taken as the tare mass plus the maximum allowable mass of the contents. NOTE g = gravitational acceleration. 6 Pressure vessel accessories 6.1 Required pressure vessel accessories 6.1.1 Contents gauge 6.1.1.1 Pressure vessels shall be equipped with a suitable contents gauge. The requirements of EN 12493 for maximum fill shall apply. 6.1.1.2 Where the contents of the pressure vessel are to be measured by volume rather than by mass, at least two independent systems of measuring the contents shall be fitted, only one of which can be a fixed liquid level gauge. 6.1.2 Pressure gauge Pressure vessels shall be equipped with a pressure gauge in accordance with 8.3. SIST EN 12252:2014

EN 12252:2014 (E) 11 6.1.3 Primary shut-off system 6.1.3.1 The road tanker shall have three mutually independent shut-off devices for each bottom filling or discharge opening. The first shall be a stop-valve mounted inside the pressure vessel (see 6.1.3.3 a)). Filling connections piped into the vapour space of the pressure vessel can use a spring loaded (held closed by the spring) soft seat non-return valve as the first stop-valve. The second shall be an external stop-valve which shall be mounted at the end of each pipe. The third shall be in the form of a blanking flange or cap. The position and/or direction of closure of valve type shut-off devices shall be clearly apparent. 6.1.3.2 All connections to the pressure vessel in excess of 1,5 mm diameter, other than those for pressure relief valves or those permanently fitted with blank flanges or plugs, shall incorporate a primary shut-off system. 6.1.3.3 The primary shut-off system shall be designed to: a) prevent the unintended opening of the internal valve through damage or inadvertent acts; b) protect the internal stop-valve from external stresses; c) allow pressure to be safely released before the blanking flanges or plugs are completely removed; and d) allow filling and discharge devices/caps to be secured against unintended opening. 6.1.3.4 The primary shut-off system required depends upon the purpose of the pressure vessel connection as follows: a) Discharge/filling to liquid phase: A normally closed internal shut-off valve opened by hydraulic, pneumatic or mechanical power from the road tanker shall be designed for rapid closure on command (see 11.2). The system shall incorporate a thermally sensitive device or other means that will ensure positive closure in the event of a fire and shall incorporate an excess flow valve facility. The operation of the internal valve shall be completely independent of any other valve and the valve shall remain effective in the event that the external manual valve is damaged. b) Filling to vapour phase: The road tanker filling connection shall be provided with either: 1) an internal, soft seat spring loaded (held closed by the spring) non-return valve in series combination with an external manual shut-off valve, or 2) a normally closed internal shut-off valve opened by hydraulic, pneumatic or mechanical power from the road tanker along with an anti-drive-away system/emergency-shut down system in series combination with an external manual shut-off valve. The operation of the internal valve shall be completely independent of any other valve and the valve shall remain effective in the event that the external manual valve is damaged. c) Other liquid or vapour piped connections: SIST EN 12252:2014

EN 12252:2014 (E) 12 All other liquid or vapour connections shall have an internal excess flow valve or internal non-return valve in series combination with a manual shut-off valve with the exception of the following: 1) pressure relief valve; 2) permanently blanked; and 3) connections with an internal bore no larger than 1,5 mm diameter. 6.2 Optional pressure vessel accessories Where any of the optional accessories are fitted (see Table 1), the following requirements shall apply: a) temperature gauges shall be in accordance with 8.4; b) pressure relief valves (PRV) shall be sized in accordance with 8.11 and Annex A; c) sun shields shall satisfy the requirements of EN 12493. 7 Vehicle LPG equipment 7.1 Mandatory LPG equipment 7.1.1 General Vehicle LPG equipment and accessories shall be protected against mechanical damage, by its design or location and/or by barriers. 7.1.2 Pipework Mechanical barriers shall not be attached to pipework or to the accessories which they are intended to protect. The pipework shall be installed so as to prevent damage due to thermal expansion and contraction, mechanical shock and vibration. The number of joints shall be kept to a minimum. Joints shall be welded or weld flanged except if permitted by 9.4. 7.1.3 Connecting hoses Connecting hoses for pipework/equipment shall be in accordance with 8.6. 7.1.4 Accessories 7.1.4.1 Thermal expansion valves Therma

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