oSIST prEN 12252:2021

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)

Dieses Dokument legt die Ausrüstung und Ausrüstungsteile von Straßentankwagen fest, die für die Beförderung von Flüssiggas (LPG) eingesetzt werden, und kennzeichnet die Ausrüstung, die als notwendig betrachtet wird, um sicherzustellen, dass Füll , Beförderungs  und Entleerungsvorgänge sicher durchgeführt werden können. Es legt die Anforderungen an die Montage der Ausrüstungsteile und der Flüssiggas Fahrzeugausrüstung an den Straßentankwagen fest. Dieses Dokument legt auch zusätzliche Ausrüstung und Ausrüstungsteile fest, die auf mit LPG beladenen Straßentankwagen verwendet werden können.
Dieses Dokument 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, vorausgesetzt, die in Abschnitt 6.8.2 des ADR [9] angegebenen Mindestanforderungen werden erfüllt.
Dieses Dokument gilt nicht für zur Beförderung von LPG verwendete „Tankcontainer“ oder „Batteriefahrzeuge“.

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

Le présent document spécifie les équipements et accessoires pour véhicules-citernes routiers destinés au transport de gaz de pétrole liquéfié (GPL) et identifie les équipements jugés nécessaires pour que les opérations de remplissage, de transport et de déchargement puissent être effectuées en toute sécurité. Il spécifie les exigences relatives à l'assemblage des accessoires et des équipements GPL sur le véhicule citerne routier. Le présent document identifie également les équipements et accessoires supplémentaires qui peuvent être utilisés sur des véhicules-citernes routiers destinés au transport de GPL.
Le présent document 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.
Le présent document 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)

General Information

• Status: Not Published
• Public Enquiry End Date: 01-Apr-2021
• ICS: 23.020.20 - Vessels and containers mounted on vehicles
• ICS: 43.080.10 - Trucks and trailers
• Technical Committee: TLP - Pressure vessels
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 02-Feb-2021
• Due Date: 22-Jun-2021
• Completion Date: 14-May-2021
• 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/TDG - Standards for referencing in the RID-ADR
• Ref Project: prEN 12252 - LPG equipment and accessories - Equipping of LPG road tankers

RELATIONS

• Revised: SIST EN 12252:2014 - LPG equipment and accessories - Equipping of LPG road tankers
• Effective Date: 01-Mar-2020

Standards Content (sample)

SLOVENSKI STANDARD
oSIST prEN 12252:2021
01-marec-2021
Oprema in pribor za utekočinjeni naftni plin (UNP) - Oprema cestnih cistern za
utekočinjeni naftni plin (UNP)
LPG equipment and accessories - Equipping of LPG road tankers
Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung von Straßentankwagen für
Flüssiggas (LPG)

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

GPL
Ta slovenski standard je istoveten z: prEN 12252
ICS:
23.020.20 Posode in vsebniki, montirani Vessels and containers
na vozila mounted on vehicles
43.080.10 Tovornjaki in priklopniki Trucks and trailers
oSIST prEN 12252:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN 12252:2021
---------------------- Page: 2 ----------------------
oSIST prEN 12252:2021
DRAFT
EUROPEAN STANDARD
prEN 12252
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2021
ICS 43.080.10 Will supersede EN 12252:2014
English Version
LPG equipment and accessories - Equipping of LPG road
tankers

Équipements pour GPL et leurs accessoires - Flüssiggas-Geräte und Ausrüstungsteile - Ausrüstung

Équipements des camions citernes pour GPL von Straßentankwagen für Flüssiggas (LPG)

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 286.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 12252:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 5

Introduction .................................................................................................................................................................... 6

1 Scope .................................................................................................................................................................... 7

2 Normative references .................................................................................................................................... 7

3 Terms and definitions ................................................................................................................................... 9

4 Requirements ................................................................................................................................................ 11

4.1 General ............................................................................................................................................................. 11

4.2 Equipment ...................................................................................................................................................... 11

4.3 Valve access .................................................................................................................................................... 12

5 Road tanker chassis..................................................................................................................................... 12

6 Pressure vessel ............................................................................................................................................. 12

6.1 Pressure vessel ............................................................................................................................................. 12

6.2 Mounting of pressure vessel on road tanker ..................................................................................... 13

6.2.1 General ............................................................................................................................................................. 13

6.2.2 Mounting ......................................................................................................................................................... 13

7 Pressure vessel accessories ..................................................................................................................... 13

7.1 Required pressure vessel accessories .................................................................................................. 13

7.1.1 Contents gauge .............................................................................................................................................. 13

7.1.2 Pressure gauge .............................................................................................................................................. 14

7.1.3 Primary shut-off system ............................................................................................................................ 14

7.2 Optional pressure vessel accessories ................................................................................................... 15

8 Vehicle LPG equipment .............................................................................................................................. 15

8.1 Mandatory LPG equipment ....................................................................................................................... 15

8.1.1 General ............................................................................................................................................................. 15

8.1.2 Pipework ......................................................................................................................................................... 15

8.1.3 Connecting hoses .......................................................................................................................................... 15

8.1.4 Accessories ..................................................................................................................................................... 16

8.1.5 Earth connection .......................................................................................................................................... 16

8.2 Optional LPG equipment ........................................................................................................................... 16

9 Equipment specifications .......................................................................................................................... 17

9.1 Suitable materials ........................................................................................................................................ 17

9.1.1 General ............................................................................................................................................................. 17

9.1.2 Steel pressure retaining parts ................................................................................................................. 17

9.1.3 Non-pressure retaining parts .................................................................................................................. 17

9.1.4 Welding consumables ................................................................................................................................. 17

9.1.5 Non-metallic materials ............................................................................................................................... 17

9.1.6 Pipework ......................................................................................................................................................... 17

9.1.7 Certification of materials........................................................................................................................... 18

9.1.8 Control of materials..................................................................................................................................... 18

9.2 Contents gauge .............................................................................................................................................. 18

9.3 Pressure gauge .............................................................................................................................................. 18

9.4 Temperature gauge ..................................................................................................................................... 18

9.5 Pump ................................................................................................................................................................. 19

---------------------- Page: 4 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)

9.6 Hoses ................................................................................................................................................................. 19

9.7 Hose reel .......................................................................................................................................................... 19

9.8 Earth reel ......................................................................................................................................................... 19

9.9 Metering system ............................................................................................................................................ 20

9.10 Valves ................................................................................................................................................................ 20

9.11 Pressure relief valves (PRV) ..................................................................................................................... 20

9.12 Filters and strainers .................................................................................................................................... 21

9.13 Drain valves .................................................................................................................................................... 21

10 Assembly .......................................................................................................................................................... 21

10.1 General ............................................................................................................................................................. 21

10.2 Welding ............................................................................................................................................................ 21

10.2.1 Welding of the pressure containing parts ........................................................................................... 21

10.2.2 Welding of the non pressure containing parts ................................................................................... 22

10.3 Flanged connections .................................................................................................................................... 22

10.4 Screwed connections ................................................................................................................................... 22

10.5 External corrosion protection ................................................................................................................. 22

11 Initial inspection and testing .................................................................................................................... 22

11.1 General ............................................................................................................................................................. 22

11.2 Hydraulic pressure test .............................................................................................................................. 23

11.3 Leakproofness test ....................................................................................................................................... 23

12 Safety systems ................................................................................................................................................ 23

12.1 General ............................................................................................................................................................. 23

12.2 Emergency Shut-Down system (ESD) .................................................................................................... 24

13 General safety requirements .................................................................................................................... 24

Annex A (normative) Discharge rates for pressure relief valves — Discharge capacity ................. 25

Annex B (informative) Calculation of mountings of pressure vessel to the chassis .......................... 27

B.1 General ............................................................................................................................................................. 27

B.2 Mounting of pressure vessel to the chassis ......................................................................................... 28

B.2.1 Fixing rods ....................................................................................................................................................... 28

B.2.2 Bolts ................................................................................................................................................................... 28

B.2.3 Bracket welds ................................................................................................................................................. 28

B.2.4 Allowable stress ............................................................................................................................................ 28

B.2.5 Typical mounting .......................................................................................................................................... 29

B.3 Calculation of fixing rods ........................................................................................................................... 29

B.3.1 In the direction of travel ............................................................................................................................ 29

B.3.2 At right angles to the direction of travel .............................................................................................. 30

B.3.3 Vertically upwards ....................................................................................................................................... 30

B.4 Calculation of the bracket welds ............................................................................................................. 31

B.4.1 General ............................................................................................................................................................. 31

B.4.2 In the direction of travel ............................................................................................................................ 31

B.4.3 At right angles to the direction of travel .............................................................................................. 31

B.4.4 Vertically upwards ....................................................................................................................................... 31

---------------------- Page: 5 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)

B.5 Calculation of fixing bolts .......................................................................................................................... 32

B.5.1 General ............................................................................................................................................................. 32

B.5.2 In the direction of travel ............................................................................................................................ 32

B.5.3 At right angles to the direction of travel .............................................................................................. 32

B.5.4 Vertically upwards....................................................................................................................................... 33

Annex C (informative) Additional traffic safety measures ......................................................................... 34

Bibliography ................................................................................................................................................................. 35

---------------------- Page: 6 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)
European foreword

This document (prEN 12252:2021) has been prepared by Technical Committee CEN/TC 286 “LPG

equipment and accessories”, the secretariat of which is held by NSAI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12252:2014.
Compared with EN 12252:2014 the following significant changes apply:
— the term “drain valve” was added to Table 1;

— the requirement of a “dead-man” function for the Emergency-Shut-Down system was added (see

12.2.3);
— a new clause “Road tanker chassis” (see Clause 5) was added;

— new requirements for road tankers with remotely mounted discharge pump were added (see

7.1.3.4);
— introduction of overfill protection systems on the discharge side (see 8.2);
— introduction of filters and strainers (see 9.12);
— a new clause “Drain valves” (see 9.13) was added;

— clarification of specification for equipment of non-metallic materials (see 9.1.5);

— introduction of an additional Annex C on additional traffic safety measures;
— update of terms and definitions.
This document will be submitted for reference in
— the RID and/or
— the technical annexes of the ADR.

NOTE These regulations take precedence over any clause of this document. It is emphasized that RID/ADR are

being revised regularly at intervals of two years which may lead to temporary non-compliances with the clauses of

this document.
---------------------- Page: 7 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)
Introduction

This document 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. For CEN/TC 286 this is

covered in CEN/TS 16765 and this Technical Specification should be read in conjunction with this

document. This Technical Specification provides guidance on the environmental aspects to be considered

regarding equipment and accessories produced for the LPG industry and the following is addressed:

a) design;
b) manufacture;
c) packaging;
d) use and operation; and
e) disposal.

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 document that the execution of its provisions is entrusted to

appropriately qualified and experienced people.
All pressures are gauge pressures unless otherwise stated.

NOTE This document 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].

---------------------- Page: 8 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)
1 Scope

This document 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 document also

identifies additional equipment and accessories that can be used on road tankers carrying LPG.

This document 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

recognized by the competent authority, provided that the minimum requirements of section 6.8.2 of ADR

[9] are complied with.

This document does not apply to “tank-containers” or “battery-vehicles” used for the transport of LPG.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

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

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: Electric

welded and submerged arc welded 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
---------------------- Page: 9 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)

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, Industrial 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 14732:2013)

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)
---------------------- Page: 10 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
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
3.2
pressure vessel

assembly of the pressure 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
accessory

device 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 pressure 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: Referred to as fixed tanks (tank-vehicles) and demountable tanks in the ADR [9].

---------------------- Page: 11 ----------------------
oSIST prEN 12252:2021
prEN 12252:2021 (E)
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

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 to indicate when a predetermined

liquid level has been reached or surpassed
3.18
competent authority
authority or authorities or any other body or bodies
...