SIST EN 12252:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung von Straßentankfahrzeugen 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 trailersICS:Ta slovenski standard je istoveten z:EN 12252:2012SIST EN 12252:2012en,fr,de01-december-2012SIST EN 12252:2012SLOVENSKI
STANDARDSIST EN 12252:2006+A1:20081DGRPHãþD



SIST EN 12252:2012



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12252
September 2012 ICS 43.080.10 Supersedes EN 12252:2005+A1:2008English Version
LPG equipment and accessories - Equipping of LPG road tankers
Equipements pour GPL et leurs accessoires - Equipements des camions citernes pour GPL
Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung von Straßentankfahrzeugen für Flüssiggas (LPG) This European Standard was approved by CEN on 13 July 2012.
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
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12252:2012: ESIST EN 12252:2012



EN 12252:2012 (E) 2 Contents Page Foreword .4Introduction .51Scope .62Normative references .63Terms and definitions .74Requirements .94.1General .94.2Equipment . 104.3Valve access . 105Pressure vessel. 105.1Design and manufacture . 105.2Mounting of pressure vessel on road tanker . 115.2.1General . 115.2.2Mounting . 116Pressure vessel accessories . 116.1Required pressure vessel accessories . 116.1.1Contents gauge . 116.1.2Pressure gauge . 116.1.3Primary shut-off system . 126.2Optional pressure vessel accessories . 137Vehicle LPG equipment . 137.1Mandatory LPG equipment . 137.1.1General . 137.1.2Pipework . 137.1.3Connecting hoses . 137.1.4Acessories . 137.1.5Earth connection. 147.2Optional LPG equipment . 148Equipment specifications . 148.1Suitable materials . 148.1.1General . 148.1.2Steel pressure retaining parts . 158.1.3Non-pressure retaining parts . 158.1.4Welding consumables . 158.1.5Non-metallic materials . 158.1.6Pipework . 158.1.7Certification of materials . 158.1.8Control of materials . 158.2Contents gauge . 168.3Pressure gauge . 168.4Temperature gauge. 168.5Pump . 168.6Hoses . 178.7Hose reel . 178.8Earth reel . 178.9Metering system. 178.10Valves . 17SIST EN 12252:2012



EN 12252:2012 (E) 3 8.11Pressure relief valves (PRV) . 189Assembly . 189.1General . 189.2Welding . 189.2.1Welding of the pressure containing parts . 189.2.2Welding of the non pressure containing parts . 199.3Flanged connections . 199.4Screwed connections . 199.5External corrosion protection . 1910Inspection and testing . 1910.1General . 1910.2Hydraulic pressure test . 1910.3Leak test . 2011Safety systems . 2011.1General . 2011.2Emergency Shut-Down system (ESD) . 2012General safety requirements . 21Annex A (normative)
Discharge rates for pressure relief valves — Discharge capacity . 22Annex B (informative)
Calculation of mountings of pressure vessel to the chassis . 24Annex C (informative)
Environmental Checklist . 31Bibliography . 32 SIST EN 12252:2012



EN 12252:2012 (E) 4 Foreword This document (EN 12252:2012) 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 March 2013, and conflicting national standards shall be withdrawn at the latest by March 2013. 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 12252:2005+A1:2008. 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:  alignment of 6.1.3 with the requirements of sections 6.8.2.2.2 and 6.8.3.2.3, amongst others of ADR [9]; and  the addition of an environmental checklist Annex C. According to the CEN/CENELEC Internal Regulations, the national standards organisations 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 12252:2012



EN 12252:2012 (E) 5 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 have 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 12252:2012



EN 12252:2012 (E) 6 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 287-1, Qualification test of welders — Fusion welding — Part 1: Steels 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 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 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 SIST EN 12252:2012



EN 12252:2012 (E) 7 EN 10217-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy steel tubes with specified room temperature properties 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 tanks for liquefied petroleum gas (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 LPG transfer hoses EN 14424, Hose fittings with screwed ferrules prEN 16125, LPG equipment and accessories — Pipework systems and supports — LPG liquid phase and vapour pressure phase 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 10497, Testing of valves — Fire type-testing requirements (ISO 10497) 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 12252:2012



EN 12252:2012 (E) 8 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 devices connected to the system whose main function 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 rigid vehicle, semi-trailer or trailer comprising of one or more fixed pressure vessels Note 1 to entry: Road tankers are referred to as fixed tanks (tank-vehicles) and demountable tanks in the ADR [9]. 3.9 hydrostatic relief 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 Note 1 to entry: A hydrostatic relief valve is also referred to as thermostatic relief valve. 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 12252:2012



EN 12252:2012 (E) 9 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 control device, such as a dip tube in combination with a vent valve, used to indicate when a predetermined liquid level has been reached or surpassed 3.18 competent authority authority designated as competent in each country in accordance with national regulation 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  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. SIST EN 12252:2012



EN 12252:2012 (E) 10 4.1.3 It is recommended that materials and components are 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 ClausesMandatory
Optional AccessoriesContents 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 VehicleLPG equipmentPipework 7.1.2 / 8.1.6 X
Emergency shut-down system 11.2 X
Hoses 7.1.3 / 8.6 X
Thermal expansion valves/hydrostatic relief 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 12252:2012



EN 12252:2012 (E) 11 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 electrical path shall not exceed 10 . 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 vesselAt right angles to the direction of travel 1 g × total mass of pressure vesselVertical, upwards 1 g × total mass of pressure vesselVertical, downwards 2 g × total mass of pressure vesselThe 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 12252:2012



EN 12252:2012 (E) 12 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)).
The second shall be an external stop-valve which shall be mounted as close as reasonably practicable to the pressure vessel.
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.
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.
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
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