oSIST prEN 13175:2010

LPG Equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) tank valves and fittings

This European Standard specifies minimum requirements for the design and testing of valves, including appropriate fittings, which are connected to mobile or static LPG tanks above 150 litre water capacity. Pressure relief valves and their ancillary equipment,
contents gauges and automotive LPG components are outside the scope of this European Standard.
And,
the 3 ¼" ACME coupling, explore the possibility of the revision being:
- silent on its use;
- excluding its use;
- including its use, or
- developing a possible new thread type.

Flüssiggas-Geräte und -Ausrüstungsteile - Spezifikation und Prüfung von Ventilen und Ausrüstungsteilen von Behältern für Flüssiggas (LPG)

Diese Europäische Norm legt Mindestanforderungen für die Auslegung und Prüfung von Ventilen, einschließlich zugehöriger Ausrüstungsteile fest, die an mobilen oder ortsfesten Behältern für Flüssiggas (LPG, en: Liquefied Petroleum Gas) mit einem Fassungsraum über 150 l angebracht sind. Diese Europäische Norm gilt nicht für Sicherheitsventile und deren Zusatzausrüstung, Füllstandsanzeiger und Bauteile für LPG-Fahrzeuge.
Diese Europäische Norm gilt nicht für Raffinerien oder andere verfahrenstechnische Anlagen.

Equipements pour GPL et leurs accessoires - Spécifications et essais des équipements et accessoires des réservoirs pour gaz de pétrole liquéfié (GPL)

La présente Norme européenne définit les exigences minimales de conception et d’essais pour les équipements et leurs accessoires qui sont raccordés à des réservoirs fixes ou mobiles de GPL dont la capacité en eau est supérieure à 150 l. Les soupapes de sûreté et leurs équipements auxiliaires, les jauges de niveau et les composants pour véhicules GPL sont en dehors du domaine d’application de la présente Norme européenne.
La présente Norme européenne ne s'applique pas aux raffineries ou à d'autres usines de traitement.

Oprema in pribor za utekočinjeni naftni plin (UNP) - Specifikacija in preskušanje ventilov in fitingov za rezervoarje za utekočinjeni naftni plin (UNP)

General Information

• Status: Not Published
• Public Enquiry End Date: 19-Oct-2010
• ICS: 23.020.10 - Stationary containers and tanks
• ICS: 23.060.01 - Valves in general
• ICS: 75.180.01 - Equipment for petroleum and natural gas industries in general
• Technical Committee: TLP - Pressure vessels
• Current Stage: 98 - Abandoned project (Adopted Project)
• Start Date: 09-Sep-2013
• Due Date: 14-Sep-2013
• Completion Date: 09-Sep-2013
• 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
• Directive: 97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Mandate: M/086 - Mandate to CEN for standardization in the field of transport of dangerous goods
• Ref Project: FprEN 13175 - LPG Equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings

Relations

• Revised: SIST EN 13175:2003+A2:2007 - LPG equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) tank valves and fittings
• Effective Date: 08-Jun-2022
• Revised: SIST EN 13175:2003+A2:2007 - LPG equipment and accessories - Specification and testing for Liquefied Petroleum Gas (LPG) tank valves and fittings
• Effective Date: 01-Sep-2010

Overview

prEN 13175 (draft FprEN 13175) is a CEN European Standard that specifies minimum design and testing requirements for Liquefied Petroleum Gas (LPG) pressure vessel valves and fittings fitted to mobile or static LPG tanks with more than 150 litre water capacity. It updates and will supersede EN 13175:2003+A2:2007 and is intended for manufacturers, test houses and regulatory bodies. The standard excludes pressure relief valves, contents gauges and automotive LPG components and is not intended for refineries or process plants.

Key topics and technical requirements

This standard sets out comprehensive technical requirements and test regimes for LPG valves and fittings, including:

• Materials: requirements for metallic (including aluminium, zinc and brass alloys) and non‑metallic components, and rules for lubricants, sealants and adhesives.
• Design requirements: general design, seats and seals, springs, threads and flanges, plus device‑specific clauses (excess flow, non‑return, shut‑off, filler and auto‑stop filler valves, multipurpose valves, internal and vapour equalising valves).
• Couplings and special devices: normative Annex A on ACME connections, Annex D on dry disconnect couplings, and the addition of auto‑stop filler valve provisions.
• Testing of design: a full test matrix including over‑torque deformation, external leakage, seat leakage, residual flow, endurance, pressure strength, excess flow tests (air and water), weak section strength, stress cracking, vacuum and flow resistance tests.
• Production testing, marking and documentation: minimum production test requirements, marking rules and required documentation, plus an environmental checklist (Annex F).
• Regulatory relationship: informative Annex ZA maps the standard to Essential Requirements of EU Directive 97/23/EC.

Applications and users

prEN 13175 is practical for:

• Manufacturers of LPG tank valves, filler valves and fittings - to design and validate products to a harmonized European level.
• Independent test laboratories - to perform the prescribed design and production tests.
• Component specifiers, tank builders and OEMs - to select compliant valves, couplings and fittings for mobile and static tanks >150 L.
• Maintenance and inspection professionals - to assess conformity and serviceability.
• Regulators and certification bodies - for conformity assessment and harmonized safety expectations.

Keywords: LPG valves, LPG fittings, pressure vessel valves, prEN 13175, CEN, ACME coupling, dry disconnect coupling, auto‑stop filler valve, valve testing.

3 1/4" ACME coupling - revision options

Annex C addresses inspection of the 3 1/4" ACME coupling and includes periodic testing recommendations. Possible revision approaches under consideration include:

• Remain silent: no normative position; leave use governed by existing practice and national rules.
• Exclude its use: prohibit 3 1/4" ACME where deemed incompatible with safety or harmonization goals.
• Include its use: retain and harmonize dimensional and inspection requirements (as currently in Annex C).
• Develop a new thread type: introduce a new standardized thread/profile to replace or supplement ACME, improving interchangeability or safety. Stakeholders (manufacturers, users and national bodies) should weigh interchangeability, legacy equipment and safety/testing implications when choosing an approach.

Related standards

• EN 13175:2003+A2:2007 (to be superseded)
• Normative references cited (examples): EN 549, EN 751‑1, EN 751‑2
• EU Directive 97/23/EC (see Annex ZA)

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2010
2SUHPDLQSULERU]DXWHNRþLQMHQLQDIWQLSOLQ813=DKWHYHLQSUHVNXãDQMH
YHQWLORYLQSULNOMXþNRY]DSRVRGH]DXWHNRþLQMHQLQDIWQLSOLQ813
LPG Equipment and accessories - Specification and testing for Liquefied Petroleum Gas
(LPG) tank valves and fittings
Flüssiggas-Geräte und -Ausrüstungsteile - Spezifikation und Prüfung von Ventilen und
Ausrüstungsteilen von Behältern für Flüssiggas (LPG)
Equipements pour GPL et leurs accessoires - Spécifications et essais des équipements
et accessoires des réservoirs pour gaz de pétrole liquéfié (GPL)
Ta slovenski standard je istoveten z: prEN 13175
ICS:
23.020.10 1HSUHPLþQHSRVRGHLQ Stationary containers and
UH]HUYRDUML tanks
23.060.01 Ventili na splošno Valves in general
75.180.01 Oprema za industrijo nafte in Equipment for petroleum and
zemeljskega plina na splošno natural gas industries in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
prEN 13175
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2010
ICS 23.060.01 Will supersede EN 13175:2003+A2:2007
English Version
LPG Equipment and accessories - Specification and testing for
Liquefied Petroleum Gas (LPG) tank valves and fittings
Equipements pour GPL et leurs accessoires - Flüssiggas-Geräte und -Ausrüstungsteile - Spezifikation
Spécifications et essais des équipements et accessoires und Prüfung von Ventilen und Ausrüstungsteilen von
des réservoirs pour gaz de pétrole liquéfié (GPL) Behältern 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland 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

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13175:2010: E
worldwide for CEN national Members.

prEN 13175:2010 (E)
Contents Page
Foreword .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Terms and definitions .7
4 Operating conditions .9
5 Materials . 10
5.1 Environmental . 10
5.2 General . 10
5.3 Metallic materials . 10
5.4 Non-metallic components . 10
5.5 Lubricants, sealants and adhesives . 11
6 Design – general requirements . 11
6.1 General . 11
6.2 Seats and seals . 11
6.3 Springs . 12
6.4 Threads . 12
6.5 Flanges . 12
7 Design - specific requirements . 12
7.1 Excess flow valve . 12
7.2 Non-return valve . 12
7.3 Shut-off valves . 13
7.3.1 General . 13
7.3.2 Excess flow protection . 13
7.3.3 Service valve . 13
7.4 Filler valve . 14
7.5 Auto-stop filler valve . 14
7.5.1 General . 14
7.5.2 Performance: . 15
7.5.3 Float . 15
7.6 Occasional liquid withdrawal valve . 15
7.7 Internal valve . 15
7.8 Vapour equalising valve . 16
7.9 Multipurpose valve . 16
7.10 Breakaway coupling . 16
7.11 Dry Disconnect Couplings . 16
7.12 Pressure gauge . 16
7.13 Temperature gauge. 16
8 Testing of the design . 16
8.1 General . 16
8.2 Over torquing deformation test . 17
8.3 External leakage test . 17
8.4 Seat leakage test . 19
8.5 Residual flow test . 20
8.6 Endurance test . 20
8.7 Pressure strength test . 20
8.8 Excess flow test . 21
prEN 13175:2010 (E)
8.8.1 General . 21
8.8.2 Excess flow test with air . 21
8.8.3 Excess flow test with water . 22
8.8.4 Excess flow strength test . 22
8.9 Weak section strength test . 22
8.10 Stress cracking test . 22
8.10.1 General . 22
8.10.2 Mercurous nitrate immersion test . 23
8.10.3 Moist ammonia air stress cracking test . 23
8.11 Vacuum test . 23
8.12 Flow resistance test . 23
8.13 Auto-stop filler valve flow tests . 23
8.13.1 Flow tests . 23
8.13.2 Level tests . 23
8.14 Test report . 23
9 Production testing . 23
10 Marking . 24
11 Documentation . 24
Annex A (normative)  ACME connections . 25
Annex B (normative)  Special low temperature requirements for valves . 28
Annex C (informative) Inspection of 3 ¼" ACME Couplings . 29
C.1 Introduction . 29
C.2 Definitions . 29
C.3 Visual Examination . 29
C.4 Dimensional check . 30
Annex D (normative) Dry disconnect couplings. 32
Annex E (normative) Production testing and inspection . 36
Annex F (informative) Environmental checklist . 38
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 97/23/EC . 39
Bibliography . 40

prEN 13175:2010 (E)
Foreword
This document (prEN 13175:2010) has been prepared by Technical Committee CEN/TC 286 “Liquefied
petroleum gas 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 13175:2003+A2:2007.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive 97/23/EC.
For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of this
document.
The major changes to this revision include:
 The inclusion of aluminium alloys and zinc alloys
 Additional requirements for brass materials
 Change in requirements for non-metallic components, lubricants, sealants and adhesives
 The insertion of auto-stop filler valve, dry disconnect couplings requirements and the deletion of plug and
cap requirements.
 Additional requirements for periodic testing of 3 ¼" x 6 ACME threaded connections in Annex C
 Introduction of Annex D, dry disconnect couplings
 Introduction of the Annex F, Environmental checklist

prEN 13175:2010 (E)
Introduction
This European Standard calls for the use of substances and procedures that may be injurious to health and/or
the environment if adequate precautions are not taken. It refers only to technical suitability and does not
absolve the user from legal obligations at any stage.
Protection of the environment is a key political issue in Europe and elsewhere. Protection of the environment
is taken in a very broad sense. What is meant is the total life cycle aspects of, e.g. a product on the
environment, including expenditure of energy and during all phases from mining of raw materials, fabrication,
packaging, distribution, use, scrapping, recycling of materials, etc.
NOTE Annex F indicates which clauses in this standard 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
ISO 14000 series
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 This 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 may be beneficial
to refer to the leaflet “measurement uncertainty leaflet (SP INFO 2000 27 uncertainty pdf)”,

prEN 13175:2010 (E)
1 Scope
This European Standard specifies minimum requirements for the design and testing of valves, including
appropriate fittings, which are connected to mobile or static LPG tanks above 150 l water capacity. Pressure
relief valves and their ancillary equipment, contents gauges and automotive LPG components are outside the
scope of this European Standard.
This European Standard does not apply to refineries or other process plants.
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 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment.
EN 751 -1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot
water - Part 1: Anaerobic jointing compounds
EN 751-2, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot
water - Part 2: Non-hardening jointing compounds
EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot
water - Part 3: Unsintered PTFE tapes
EN 837-1, Pressure gauges – Part 1: Bourdon tube pressure gauges - Dimensions, metrology, requirements
and testing.
EN 1092–1, Flanges and their joints – Circular flanges for pipes, valves, fittings and accessories, PN
designated – Part 1: Steel flanges.
EN 1267, Valves – Test of flow resistance using water as test fluid.
EN 1503-1, Valves – Materials for bodies, bonnets and covers – Part 1: Steels specified in European
Standards.
EN 1503-2, Valves – Materials for bodies, bonnets and covers – Part 2: Steels other than those specified in
European Standards.
EN 1503-3, Valves – Materials for bodies, bonnets and covers – Part 3: Cast Irons specified in European
Standards.
EN 1503-4, Valves – Materials for bodies, bonnets and covers – Part 4: Copper alloys specified in European
Standards.
EN 563, Founding – Spheroidal graphite cast irons.
EN 983, Industrial valves – Steel ball valves.
EN 10270-3, Steel wire for mechanical springs – Part 3: Stainless spring steel wire.
EN 12164, Copper and copper alloys – Rod for free machining purposes.
prEN 13175:2010 (E)
EN 12165, Copper and copper alloys - Wrought and unwrought forging stock
prEN 12360, Industrial valves – Copper alloy globe valves.
EN 12420, Copper and copper alloys – Forgings.
EN 12516-1, Industrial valves – Shell design strength – Part 1: Tabulation method for steel valves.
EN 12516-2, Industrial valves – Shell design strength – Part 2: Calculation method for steel valves.
EN 12516-3, Valves – Shell design strength – Part 3: Experimental method.
CEN/TS 13547, Industrial valves – Copper alloy ball valves.
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 LPG tanks
EN 13906, Cylindrical helical springs made from round wire and bar – Calculation and design.
EN 15202, LPG equipment and accessories - Essential operational dimensions for LPG cylinder valve outlet
and associated equipment connections$
EN 50014, Electrical apparatus for potentially explosive atmospheres – General requirements.
EN ISO 11114-1, Transportable gas cylinders - Compatibility of cylinder and valve materials with gas contents
- Part 1: Metallic materials (ISO 11114-1:1997)
EN ISO 11114-2, Transportable gas cylinders - Compatibility of cylinder and valve materials with gas contents
- Part 2: Non-metallic materials (ISO 11114-2:2000)
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads – Part 1: Dimensions, tolerances
and designation.
ISO 301, Zinc alloy ingots intended for castings
ISO 2859-1, Sampling procedures for inspection by attributes – Part 1: Sampling schemes indexed by
acceptance quality limit (AQL) for lot-by-lot inspection.
ISO 6957, Copper alloys – Ammonia test for stress corrosion resistance.
ANSI/ASME B1.20.1 – 1983, Pipe threads, general purpose (inch) issued by American National Standards
Institute on 1983.
ASME B1.5 – 1990, ACME Screw Threads issued by American Society of Mechanical Engineers on 1990.
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply.
3.1
Liquefied Petroleum Gas (LPG)
mixture of predominantly butane or propane with traces of other hydrocarbon gases classified in accordance
with UN number 1965, hydrocarbon gases mixture, liquefied, NOS or UN number 1075, petroleum gases,
liquefied
prEN 13175:2010 (E)
NOTE 1 In some countries, UN numbers 1011 and 1978 may also be designated LPG.
3.2
self closing valve
normally closed valve that provides a leak tight seal and opens by the engagement of a special connector or
by fluid passing through it. It closes automatically upon removal of the connector or by stopping the fluid flow
3.3
sealing element
element used to provide internal leak tightness
3.4
maximum allowable pressure
maximum pressure for which the equipment is designed
3.5
internal leak tightness
resistance to leakage across the valve seal or other internal sealing components when the valve is closed
3.6
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
3.7
non return valve
valve designed to close automatically to restrict reverse flow
3.8
residual flow
allowable flow past the seat of an excess flow valve or a non return valve, when the valve is in the closed
position
3.9
shut-off valve
valve to provide a leak-tight seal which is operated either manually, remotely or is self-closing
3.10
filler valve
valve system for liquid fill service
3.11
occasional liquid withdrawal valve
normally blanked valve, used for occasional liquid withdrawal which is designed to be opened by the
engagement of a special connector valve
3.12
internal valve
valve which has its seal within the profile of the tank
3.13
vapour equalising valve
valve which permits vapour to flow in either direction in order to equalise vapour pressure between tanks
during liquid transfer, and which incorporates an excess flow valve and a self closing valve opened by a
special connector valve.
prEN 13175:2010 (E)
3.14
multipurpose valve
valve which incorporates two or more service functions and which meets the combined requirements of the
individual functions
3.15
breakaway coupling
coupling which separates at a predetermined section when required and each separated section contains a
self-closing shut-off valve, which seals automatically
3.16
test pressure
pressure at which the valve, fitting or component is tested
NOTE All pressures are gauge pressures unless otherwise stated.
3.17
plug
component which seals a female connection
3.18
cap
component which seals a male connection
3.19
fitting
pressure containing component fitted to an LPG pressure system
3.20
STP
Standard Temperature and Pressure [15,6 °C (288,7 K), 1,013 bar absolute (0,101 3 MPa absolute)]
3.21
service valve
valve for fluid off take which is manually operated to provide a leak-tight seal
3.22
filler valve with overfill protection device (OPD):
filler valve designed to automatically reduce the filling rate to a minimal flow when the tank level reaches a
predetermined amount.
4 Operating conditions
Valves and fittings designed in accordance with this standard shall be suitable for the following conditions:
 a minimum operating temperature of -20 °C. In service, temperatures below this can be encountered
during short periods, for example, when filling;
 for some parts of Europe and certain applications, temperatures lower than -20 °C can be encountered,
for these conditions the requirements of Annex B shall be met;
 the maximum operating temperature is 65 °C. The maximum allowable pressure for valves or fittings is
25 bar;
 the minimum pressure to which a valve or fitting is normally exposed is 0 bar. Vacuum conditions on the
valve, arising from butane at low temperature or evacuation of the tank may expose the valve or fitting to
a vacuum of 50 mbar absolute.
prEN 13175:2010 (E)
5 Materials
5.1 Environmental
The manufacturer shall endeavour to acquire materials and components from suppliers who have a declared
environmental policy, see EN ISO 14021, EN ISO 14024 and ISO 14025.
5.2 General
5.2.1 All materials in contact with LPG shall be physically and chemically compatible with LPG under all
the normal operating conditions for which the contents gauge is intended.
5.2.2 Materials for gauge components shall be selected to give adequate strength in service.
Consideration shall also be given to other modes of failure such as atmospheric corrosion, brass
dezincification, stress corrosion, impact or material failure.
5.2.3 Alternative materials to those listed in 5.3 are not precluded, providing they comply with a standard or
specification that ensures control of chemical and physical properties, and quality appropriate to the end use.
5.3 Metallic materials
5.3.1 Metallic materials for gauges shall be steel, stainless steel, copper alloys, aluminium alloys, zinc
alloys, or other suitable materials.
5.3.2 For pressure containing components steel and stainless steels shall comply with EN 1503-1 or
EN 1503-2, cast iron shall comply with EN 1503-3 and copper alloys shall comply with EN 1503-4.
5.3.3 Materials for steel flanges shall be in accordance with EN 1092-1.
5.3.4 Stainless steel for components shall contain not less than 16 % chromium, and not less than 7 %
nickel.
5.3.5 Springs shall be manufactured from stainless steel in accordance with EN 10270-3 or a material with
an equivalent resistance to corrosion.
5.3.6 Hot stamped brass shall be non-porous and suitable for machining or other processing. Leaded
brass shall be CW614N or CW617N in accordance with EN 12420 and EN 12165. Sand-cast brass shall not
be used. Cold drawn brass rods shall only be used for machining after adequate testing for internal cracking,
porosity or other inclusions and shall be heat treated if required. Components produced from stamping brass
shall not exhibit cold shuts also known as folds, or surface defects.
5.3.7 Components manufactured from hot stamped brass or contents gauge bodies made of drawn brass
or machined from brass rod shall be capable of withstanding, without cracking, the stress-cracking test.
5.3.8 Spheroidal graphite cast iron shall comply with EN 1563, with an elongation at fracture of more than
18 %. Other ductile irons or cast irons shall not be used.
5.3.9 ZnAl4 and ZnAl4Cu1 shall be in accordance with ISO 301.
5.3.10 Castings shall be free from inclusions and surface defects which could adversely affect the strength,
leak tightness or performance of the contents gauge.
5.3.11 For guidance on the choice of metallic materials, see EN ISO 11114-1.
5.4 Non-metallic components
5.4.1 For guidance on the choice of non-metallic materials, see EN ISO 11114-2.
prEN 13175:2010 (E)
5.4.2 All non-metallic materials in contact with LPG shall not distort, harden or adhere to the body or seat
face to such an extent as to impair the function of the valve.
All rubber materials shall also comply with the requirements of EN 549. The ozone test in EN 549 shall only
be carried out where gaskets/seals are exposed to atmosphere.
5.4.3 The buoyancy of flotation devices shall not be affected by the LPG.
5.5 Lubricants, sealants and adhesives
Where used on threads and seals; lubricants, sealants, and adhesives shall be compatible with LPG and not
interfere with the operation of the contents gauge. Sealants shall comply with EN 751 -1, EN 751-2 or
EN 751-3.
6 Design – general requirements
6.1 General
6.1.1 All valves and fittings shall be capable of withstanding the tests specified in Table 1 where
appropriate.
6.1.2 Moving parts shall have sufficient clearance to ensure freedom of movement under all normal
conditions of service. Where necessary, means of guidance shall be provided to ensure correct seating or
sealing.
6.1.3 All components vital to the function of a valve or fitting shall be secured to prevent disassembly
during normal operation.
6.1.4 Valves and fittings shall be designed to ensure external and internal leak tightness, and its function
shall not be affected, as a result of vibration during transportation.
6.1.5 The design shall take account of the use of dissimilar materials, e.g. electrochemical corrosion or
material expansion.
6.1.6 Electrical equipment, when used in an integral part of a valve or fitting, shall meet the requirements
of EN 50014 where appropriate.
6.1.7 Valves shall have their flow resistance determined using water as a test fluid
6.1.8 Possible stress corrosion shall be eliminated by either design or heat treatment.
NOTE The design should take account of the following:
 Minimising the use of raw materials
 Minimising the environmental impact of in-service maintenance and end of life disposal
 Efficient packaging of finished product
6.2 Seats and seals
6.2.1 Valves and fittings shall be so designed that they can be installed without damaging non-metallic
seats or seals.
6.2.2 Sealing may be achieved by either elastomeric or other non-metallic material. When a metal to metal
closure is used, the residual flow shall meet the requirements of 8.5.
prEN 13175:2010 (E)
6.2.3 The sealing element ensuring internal leak tightness shall be attached or otherwise assembled such
that it will not become dislocated under service conditions. The means to secure the sealing element shall not
rely solely on adhesive.
6.3 Springs
Springs shall be designed in accordance with EN 13906.
6.4 Threads
6.4.1 Taper threaded tank connections shall comply with ANSI/ASME B1.20.1 - 1983. Thread sizes shall
not exceed DN 80.
6.4.2 Where taper threads are used, the design shall ensure that over-torquing shall not impede the
correct operation of the valve or fitting, see 0.
6.4.3 Taper threaded sections of a body designed for a tank connection shall be constructed with
wrenching flats.
6.4.4 All threads other than taper threaded tank connections shall be in accordance with a European
Standard (EN) or an International Standards (ISO), or shall be ACME threads in accordance with Annex A or
ANSI/ASME B1.20.1 - 1983. Where the design includes 3-¼" x 6 ACME threads, periodic inspection
requirements are shown in Annex C.
6.4.5 To avoid mismatching with ANSI/ASME B1.20.1 – 1983 threads, ISO 7-1 shall not be used.
6.5 Flanges
Flanges shall comply with EN 1092-1.
7 Design - specific requirements
7.1 Excess flow valve
7.1.1 Excess flow valves shall be designed so that when closed the flow past the seat to allow for
reduction of differential pressure across the valve, shall not exceed that of an opening of 1,77 mm cross
sectional area.
7.1.2 Excess flow valves shall operate at a flow-rate of not more than 10 % above, nor less than 20 %
below the rated closing flow capacity specified and it shall close automatically at a pressure differential across
the valve of not more than 1,4 bar.
7.1.3 The connection to the tank shall not affect the function of the valve or its rated flow.
NOTE Copper alloy excess flow valves manufactured in accordance with prEN 12328 are suitable.
7.2 Non-return valve
The connection to the tank shall not affect the operation of the non-return valve.
prEN 13175:2010 (E)
7.3 Shut-off valves
7.3.1 General
Shut off valves shall be of the ball valve, globe valve types or shall be a service valve. Ball valves shall be in
accordance with EN 1983 or CEN/TS 13547 and globe valves shall be in accordance with prEN 12360,
EN 13709 or EN 13789. A service valve shall meet the requirements of 7.3.3.
7.3.2 Excess flow protection
Valves with a minimum cross section of LPG passage through the valve, greater than 7 mm² (equivalent to a
diameter of 3 mm) for liquid phase withdrawal, shall be protected by an excess flow valve.
Valves with a minimum cross section of LPG passage through the valve, greater than the equivalent cross
sectional area of 50 mm² diameter (equivalent to a diameter of 8 mm) for vapour phase withdrawal, shall be
protected by an excess flow valve.
7.3.3 Service valve
7.3.3.1 Valve operating mechanism
The valve operating mechanism includes a hand-wheel.
The valve operating mechanism shall be designed in such a way that it remains captive, and it achieves a
direct contact with the valve body in the case of absence of the sealing element. The valve shall be designed
in such a way that the valve operating mechanism cannot be removed during normal use and without showing
tamper evidence.
Under normal use the valve shall operate without difficulty even after prolonged use and shall satisfy the
requirements of 8.6 with the closing torque not exceeding 3 N⋅m.
The sealing element, to ensure internal leak tightness, shall be attached or otherwise assembled such that it
will not become dislocated under service conditions. The means to secure the sealing element shall not rely
solely on cement or adhesive.
All valves shall close when turned clockwise and open when turned anti-clockwise. It is recommended that
the valve operating mechanism should be visibly marked with a portion of circle terminating in two arrows.
One arrow marked “–“ and the other arrow marked “+”, to indicate the result of the rotation as detailed in
Figure 1.
Figure 1 — Hand-wheel marking
7.3.3.2 Valve body
If the valve body is made of more than one part, precautions shall be taken to ensure that there can be no
unintentional dismantling. Disassembly shall require specialised equipment.
7.3.3.3 Sealing mechanism
The mechanism shall ensure internal leak tightness.
prEN 13175:2010 (E)
7.3.3.4 Operating torque
After the endurance test in accordance with 8.6, the operating torque shall not exceed 3 N⋅m during the
service valve life.
7.4 Filler valve
7.4.1 The filler valve shall be either a:
 manually, or remotely operated shut-off valve in combination with a non-return valve, or
 double non-return valve, at least one of which meets the requirements of 8.4, or
 system that provides an equivalent level of safety.
7.4.2 Where supplied as an assembled unit, the filler valve shall meet the following criteria:
 the non-return valve components shall meet the requirements of 7.2;
 where liquid can be trapped, means shall be provided to relieve excess pressure;
 where the body is made of two or more components, it shall not be possible to disassemble the
components with a torque of less than 80 N⋅m.
7.4.3 The fill connection shall be provided with a leak tight cap or blind flange. When the fill connection is
provided with a soft-seated non-return valve in combination with a shut-off valve, a leak tight cap shall not be
required. Consideration shall be given to providing dust protection.
NOTE 1 For typical filler valve inlet connections see Annex A.
NOTE 2 Where filler valve is used as a dry break coupling, the essential dimensions for a two inch and three inch
connections are shown in Annex D
NOTE 3 Plugs and caps can be provided with a locking mechanism to discourage unauthorised interference.
7.4.4 Where the connecting seal is retained in the body of the filler valve, the seal retaining groove shall be
provided with a vent hole in order to prevent the ejection of the seal on disconnection.
7.4.5 A weak section e.g. break-off grooves, or shear points, shall be included such as to leave the main
closure intact if it should be subjected to external damage. The bending force to fracture must be between
400 and 500 N⋅m.
7.5 Auto-stop filler valve
7.5.1 General
7.5.1.1 The auto stop filler valve shall be a double non-return valve meeting the requirements of 8.4. The
filling connection shall be 1-¾” ACME provided with a leak tight cap. The connecting seal shall be retained in
the body of the filler valve, the seal retaining groove shall be provided with a vent hole in order to prevent the
ejection of the seal on disconnection.
7.5.1.2 The valve may be provided with an extension for installation in buried tanks.
7.5.1.3 The valve shall include one or two weakness grooves:
prEN 13175:2010 (E)
 For valves without extension : A weak section e.g. break-off grooves, or shear points, shall be included
such as to leave the main closure intact if it should be subjected to external damage. The bending force
to fracture must be between 400 and 500 N⋅m.
 For valves with extension: There must be two weakness grooves, one below the ACME thread, the other
in the middle of the extension. They have to be such that the fracture by bending occurs at the upper
weakness groove with a bending force applied to the ACME thread between 400 and 500 N⋅m. The
weakness groove in the lower part must break with a bending force of between 550 and 750 N⋅m applied.
Regardless of the type of fracture, the lower check must remain operational, there shall be no deformation of
the connecting threads between the different parts, nor between the lower body and the tank. It shall also be
checked that there are no leaks on the threads.
7.5.2 Performance:
7.5.2.1 The device shall have a minimum filling rate greater or equal to 8 m /h (water) under a differential
pressure ∆P = 4 bar.
7.5.2.2 The device shall operate at a predetermined % volume level. The tolerance on filling shall be
+0% -3%. The stop must be gradual so as not to create a shock in the pipe-work upstream.
7.5.2.3 The maximum flow rate after the closure of the stop fill shall be less or equal to 50 l/h (water) with a
differential pressure ∆P = 1 bar.
7.5.3 Float
The float shall meet the requirements of EN 13799.
7.6 Occasional liquid withdrawal valve
7.6.1 An occasional liquid withdrawal valve shall incorporate an excess flow valve unless this is provided
by the special connector used to open the valve.
7.6.2 It shall be provided with a plug or cap to provide a leak-tight seal, see 8.3.
7.6.3 The plug or cap shall contain a vent to indicate leak tightness before the plug or cap is fully
disengaged.
7.6.4 The special connector shall be designed or located to ensure a sufficient engagement before
activating the self-closing element.
7.6.5 The joint between the special connector and the occasional liquid withdrawal valve shall be designed
to be leak-tight.
7.7 Internal valve
7.7.1 The internal valve shall incorporate one of the following systems:
 a self closing valve and an excess flow valve, when open;
 an automatic shut-off valve, actuated by LPG pump differential pressure that will provide a leak-tight seal
when the pump is not in operation;
 a self closing valve opened by hydraulic, pneumatic or mechanical means.
NOTE Consideration should be given to incorporating a thermally sensitive device to ensure the valve closes in the
event of fire.
prEN 13175:2010 (E)
7.7.2 A weak section e.g. break-off grooves or shear points, shall be provided to leave the main closure
intact if it should be subjected to external damage.
7.7.3 Where shear studs are provided to secure flanged valves, the stud weak section shall fail sacrificially
without causing damage that interferes with the satisfactory operation of the valve.
7.8 Vapour equalising valve
A weak section e.g. break-off grooves or shear points shall be included such as to leave the main closure
intact if it should be subjected to external damage. The bending force to fracture must be between 400 and
500 N⋅m.
7.9 Multipurpose valve
The design shall be such as to ensure that one function does not adversely affect other functions.
7.10 Breakaway coupling
The breaking strength of the coupling shall be suitable to ensure correct operation in the event of use and
shall be clearly defined by the manufacturer.
7.11 Dry Disconnect Couplings
The dry disconnect coupling shall conform to the dimensions in Annex D. The material specification for the
pressure related parts should be according to 5.2.4. For spring requirements see 5.2.5.
7.12 Pressure gauge
7.12.1 The pressure gauge shall conform to the appropriate requirement of this standard and to EN 837-1
and shall be resistant to the effects of the weather.
7.12.2 Where fluid shock or vibration are likely to be encountered, the design shall be of a type compatible
with these conditions.
7.12.3 The accuracy shall be in accordance with the requirements of EN 837-1.
7.12.4 Pressure gauges on tanks for butane service shall withstand a vacuum of at least 50 mbar absolute.
7.13 Temperature gauge
All types are permitted provided they are resistant to the effects of the weather.
8 Testing
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