ISO/DIS 4437-4:2026(en)

ISO/TC 138/SC 7

Secretariat: UNI

Date: 2025-11-19

Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves

Systèmes de canalisations en plastique pour la distribution des combustibles gazeux — Polyéthylène (PE) — Partie 4: Robinets

© ISO 2026

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of the requester.

ISO copyright office

CP 401 • Ch. de Blandonnet 8

CH-1214 Vernier, Geneva

Phone: +41 22 749 01 11

Email: copyright@iso.org

Website: www.iso.org

Published in Switzerland

Contents

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

ISO draws attention to the possibility that the implementation of this document may involve the use of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s) which may be required to implement this document. However, implementers are cautioned that this may not represent the latest information, which may be obtained from the patent database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the transport of fluids, Subcommittee SC 7, Valves and auxiliary equipment of plastics materials.

This third edition cancels and replaces the second edition (ISO 4437-4:2022), which has been technically revised.

The main changes are as follows:

— in the scope a NOTE has been added with examples of gaseous fuels as natural gas, methane, butane, propane, hydrogen, manufactured gas, biogas, and mixtures of these gases and the reference to ISO 4437 (all parts) for the colours;

— in 5.1 for PE compound for valves, reference has been made to PE 100-RC;

— editorial modifications are added in several clauses and in the Annex A and B;

— in Table 1 a new note explains that the test of leaktightness is suitable for all gaseous fuels.

A list of all parts in the ISO 4437 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

This document specifies the requirements for a piping system and its components made from polyethylene (PE) and intended to be used for the supply of gaseous fuels.

Requirements and test methods for material and components, other than valves, are specified in ISO/DIS 4437-1, ISO/DIS 4437-2 and ISO/DIS 4437-3.

Characteristics for fitness for purpose are covered in ISO/DIS 4437-5. ISO/CD TS4437-7 [^[1] gives guidance for assessment of conformity. Recommended practice for installation is given in ISO/TS 10839^[2].

This document covers the characteristics of valves.

Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 4: Valves

This document specifies the characteristics of valves made from polyethylene (PE) for piping systems in the field of the supply of gaseous fuels.

NOTE 1 For the purpose of this document the term gaseous fuels include for example natural gas, methane, butane, propane, hydrogen, manufactured gas, biogas, and mixtures of these gases.

It is applicable to unidirectional and bi-directional isolating valves with spigot ends or electrofusion sockets intended to be fused with PE pipes or fittings conforming to ISO/DIS 4437−2 and ISO/DIS 4437‑3 respectively.

Valves made from materials other than PE, designed for the supply of gaseous fuels conforming to the relevant standards can be used in PE piping systems according to ISO 4437 series, provided that they have PE connections for butt fusion or electrofusion ends, including integrated material transition joints, conforming to ISO/DIS 4437-3.

It also specifies the test parameters for the test methods referred to in this document.

In conjunction with parts 1, 2, 3 and 5 of the ISO/DIS 4437 series, it is applicable to PE valves, their joints and to joints with components of PE and other materials intended to be used under the following conditions:

a) a maximum operating pressure, MOP, up to and including 10 bar^[1] at a reference temperature of 20 °C for design purposes;

NOTE 1 For the purpose of this document and the references to ISO 8233, MOP is considered to be nominal pressure.

b) an operating temperature between −20 °C to 40 °C.

NOTE 2 For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in ISO 4437‑5.

ISO/DIS 4437 (all parts) covers a range of maximum operating pressures and gives requirements concerning colours.

It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.

This document covers valve bodies designed for connection with pipes with a nominal outside diameter d_n ≤ 400 mm.

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.

ISO 1133‑1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of thermoplastics — Part 1: Standard method

ISO 1167‑1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the resistance to internal pressure — Part 1: General method

ISO 1167‑4, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of the resistance to internal pressure — Part 4: Preparation of assemblies

ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions

ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method

ISO 8233, Thermoplastics valves — Torque — Test method

ISO 11357‑6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)

ISO 16010, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gaseous fuels and hydrocarbon fluids

ISO 17778, Plastics piping systems — Fittings, valves and ancillaries — Determination of gaseous flow rate/pressure drop relationships

ISO 18488, Polyethylene (PE) materials for piping systems — Determination of strain hardening modulus in relation to slow crack growth — Test method

ISO/DIS 4437‑1, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 1: General

ISO/DIS 4437‑2, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 2: Pipes

ISO/DIS 4437‑3, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings

ISO/DIS 4437‑5, Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 5: Fitness for purpose of the system

EN 1680, Plastics piping systems — Valves for polyethylene (PE) piping systems — Test method for leaktightness under and after bending applied to the operating mechanisms

EN 1704, Plastics piping systems — Thermoplastics valves — Test method for the integrity of a valve after temperature cycling under bending

EN 1705, Plastics piping systems — Thermoplastics valves — Test method for the integrity of a valve after an external blow

EN 12100, Plastics piping systems — Polyethylene (PE) valves — Test method for resistance to bending between supports

EN 12119, Plastics piping systems — Polyethylene (PE) valves — Test method for resistance to thermal cycling

For the purposes of this document, the terms and definitions given in ISO 4437-1, EN 736-1,^[3] EN 736-2^[4] and the following apply.

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

— ISO Online browsing platform: available at https://www.iso.org/obp

— IEC Electropedia: available at https://www.electropedia.org/

3.1.1

external leaktightness

leaktightness of the valve body enveloping the space containing the gas, with respect to the atmosphere

3.1.2

internal leaktightness

leaktightness between the inlet and the outlet of the valve, with the valve in the closed position

3.1.3

leakage

emission of gas from a valve body, or any component of a valve

3.1.4

valve body

main part of a valve which consists of an operating stop system and contains the obturator, seat(s), stem(s) or shaft(s) and packing seals, and provides the terminal ends for connection to the PE pipe/fittings as applicable

3.1.5

operating device

part of a valve for connection with the operating key which allows the opening and the closing of the valve

3.2.1

isolating valve

valve intended for use only in the closed or fully open position

[SOURCE: EN 736‑1:2018]

3.2.2

full bore valve

valve with a flow section equal to or greater than 80 % of the section corresponding to the nominal inside diameter of the body end port

[SOURCE: EN 736-3:2008, 3.3.1 – modified: Note has been omitted]^[5]

3.2.3

clearway valve

valve designed to have an unobstructed flow way, which allows for the passage of a theoretical sphere with a diameter that is not less than the nominal inside diameter of the body end port

[SOURCE: EN 736-3:2008, 3.3.1 – modified: Note has been omitted]^[5]

3.2.4

reduced bore valve

valve with a flow section equal to or greater than 36 % of the section corresponding to the nominal inside diameter of the body end port and which does not correspond to the full bore valve

[SOURCE: EN 736-3:2008, 3.3.1 – modified: Note has been omitted]^[5]

For the purposes of this document, the symbols and abbreviated terms given in ISO/DIS 4437-1 apply and the following:

The stress-bearing PE parts of injection moulded valve components, for example the main body of the valve, shall only be made from virgin material conforming to ISO/DIS 4437-1.

The stress bearing PE parts of valves made from pipe shall be made from pipe conforming to ISO/DIS 4437-2, except for the geometrical characteristics.

Other materials may be used for non-stress-bearing parts.

A valve can only be designated as a PE 100-RC valve if:

— the stress bearing part is produced from PE 100-RC materials which fulfil the requirements of ISO/DIS 4437-1, Tables 1 and 2, and are declared as PE 100-RC by the raw material producer;

and

— it fulfils the requirements of Table 1 of this document for PE 100-RC.

All components shall conform to the relevant ISO standard(s). Alternative standards may be applied in cases where the suitable ISO standard(s) do not exist. In all cases, fitness for purpose of the components shall be demonstrated.

The materials and the constituent elements used in making the valve (including elastomers, greases and any metal parts as may be used) shall be as resistant to the external and internal environments as the other elements of the piping system, and shall have an expected lifetime under the following conditions at least equal to that of the PE pipes conforming to ISO/DIS 4437-2, with which they are intended to be used:

a) during storage;

b) under the effect of the gas conveyed therein;

c) with respect to the service environment and operating conditions.

The requirements for the level of material performance of non-polyethylene parts shall be at least as stringent as that of the PE compound for the piping system. Reworked materials shall not be used for stress-bearing polymeric parts.

Other materials used in valves in contact with the PE pipe shall not adversely affect pipe performance or initiate stress cracking.

The valve manufacturer shall ensure that any transition joint between polyethylene and non-polyethylene parts and the valve body fulfil the requirements of ISO/DIS 4437-3.

All metal parts susceptible to corrosion shall be adequately protected, providing this is necessary for the durability and function of the system.

When dissimilar metallic materials are used which can be in contact with moisture, steps shall be taken to avoid the possibility of galvanic corrosion.

Elastomeric seals shall conform to ISO 16010.

The temperature range is defined by the sealing materials product standard.

Other sealing materials are permitted, if proven suitable for gas supply systems.

Greases or lubricants shall not exude onto fusion areas and shall not affect the long-term performance of the valve materials.

Ancillary components of valves shall be assembled according to manufacturer’s procedures and any component used in the assembly shall not prevent conformity of the valve to this document.

When viewed without magnification, the internal and external surfaces of valves shall be smooth, clean and shall have no scoring, cavities or other surface defects to an extent that would prevent conformity to this document.

No component of the valve shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions or cracks to an extent that would prevent conformity of the valves to the requirements of this document.

The colour of the PE parts of valves shall be either black, yellow or orange.

The valve shall be designed to provide the fluid flow passageway and the body ends.

The pressure resistance of the valve shall be defined by the manufacturer according to the design SDR and material classification.

The valve body shall be such that it cannot be dismantled.

An operating stop system shall be provided at the fully open and closed positions.

PE spigot ends or electrofusion sockets shall conform to the requirements of ISO 4437-3.

The operating device shall be integral with or connected to the stem in such a way that disconnection is impossible without special equipment.

The valve shall close by turning the operating device clockwise. For a quarter-turn valve, the position of the obturator shall be clearly indicated on the top side of the operating device.

It is recommended that the position of the obturator be marked on the access point for a quarter turn valve.

Stops shall be provided at the fully open and closed positions.

The seals shall be mounted as to be resistant to normally occurring mechanical loads, see 5.2.3. Creep and cold flow effects shall be taken into account. Any mechanism that puts a loading on the seals shall be permanently locked. Line pressure shall not be used as the sole means of seal activation.

Each valve shall be characterized by its dimensions and associated end connections.

The dimensions of the valve shall be measured in accordance with ISO 3126 and rounded to the next 0,1 mm. In case of dispute, the measurement shall not be made less than 24 h after manufacture, and after being conditioned for at least 4 h at (23 ± 2) °C.

Additionally, for spigot end valves provided with temporary supports, perform dimensional measurement at least 1 h after removal of the supports.

Indirect measurement at the stage of production is allowed at shorter time periods providing evidence is shown of correlation.

The dimensions of spigot ends shall conform to ISO/DIS 4437-3, Table 3, up to and including d_n 400 mm.

The dimensions of electrofusion sockets shall conform to ISO/DIS 4437-3, Table 1, up to and including d_n 400 mm.

For a quarter-turn valve, the dimension of the operating devices shall be designed so it can be operated with a () mm square socket, (40 ± 2) mm depth.

NOTE For a multi-turn operated valve, attention is drawn to the requirements specified in ISO 5210^[6].

All tests shall be carried out on valves assembled with pipe conforming to ISO/DIS 4437-2 from the same SDR as the SDR of the valve ends, in accordance with the technical instructions of the manufacturer and taking into account the extreme conditions of utilization described in ISO/DIS 4437‑5.

NOTE The properties of an assembled valve depend on the properties of the pipes and the valve and on the conditions of their installation (i.e. geometry, temperature, type, method of conditioning, assembly and fusion procedures).

When tested in accordance with the test methods as specified in Table 1 using the indicated parameters, the valves shall have mechanical characteristics conforming to the requirements given in Table 1.

Unless otherwise specified by the applicable test method the conditioning temperature shall be 23 °C. The temperature tolerance shall be ±2 °C, or in accordance with Table 1.

Table 1 — Mechanical characteristics

Table 2 — Circumferential (hoop) stress at 80 °C and associated minimum test period

Key

1 striker

2 impact point

3 operating device

4 valve body

5 spigot or electrofusion ends

Figure 1 — Position of the test piece for the impact loading test

The manufacturer shall indicate in the technical documentation the value of the air flow rate for reduced bore valves. This value is determined according to ISO 17778 at pressure drop for d_n ≤ 63 mm of 0,5 mbar and d_n > 63 mm of 0,1 mbar on 1 test piece.

When tested in accordance with the test methods specified in Table 3 using the indicated parameters, the valves shall have physical characteristics conforming to the requirements given in Table 3.

Table 3 — Physical characteristics

When valves conforming to this document are assembled with each other or with components conforming to other parts of the ISO 4437 series, the joints shall conform to CD ISO 4437-5.

The manufacturer of the valves shall ensure the availability of a technical description (generally confidential) containing all relevant data necessary to prove the conformity of the valves to this part of ISO 4437. The file shall include all results of type-testing. It shall also include all data necessary to implement a traceability system where required.

The characteristic of the fluid flow shall be such that the manufacturer will declare the valve as full bore or

clearway, or reduced bore.

The technical file given by the manufacturer shall include at least the following information:

a) dimensional characteristics;

b) assembly and operating instructions;

c) service conditions (e.g. valve temperature limits);

d) fusion instructions for valves with electrofusion sockets (power requirements or fusion parameters with limits);

e) air flow rate value.

12.1.1 Unless otherwise stated in Table 4, the marking elements shall be printed or formed directly on the valve in such a way that after storage, weathering, handling and installation legibility is maintained during use of the valve.

NOTE The manufacturer is not responsible for marking being illegible due to actions caused during installation and use such as painting, scratching, covering of the components or using detergents on the components unless agreed or specified by the manufacturer.

12.1.2 Marking shall not initiate cracks or other types of defects which adversely influence the performance of the valve.

12.1.3 If printing is used, the colour of the printed information shall differ from the basic colour of the valve.

12.1.4 The size of the marking shall be such that it is legible without magnification.

12.1.5 There shall be no marking over the spigot length according to ISO 4437-3 —^[2], Table 3.

The marking of an ISO standard reference on a component requires conformance with all mandatory requirements of the standard, and that the component comes within the scope of standard.

The minimum required marking shall conform to Table 4.

Table 4 — Minimum required marking

NOTE ISO 12176‑4^[8] and ISO 12176‑5^[9] provide information for traceability data coding.

Valves conforming to this document, which are third-party certified by a certification body, may be marked accordingly.

The valves shall be packaged in bulk or individually protected where necessary in order to prevent deterioration and contamination. Whenever possible, they shall be placed in individual bags, in cardboard boxes or cartons.

It is recommended to protect the spigot ends, e.g. by external caps.

The cartons and/or individual bags shall bear at least one label with the manufacturer's name, type and dimensions of the valve, number of units in the box and any special storage conditions and storage time limits, if any

It is recommended to store valves in their original packing, until ready for installation.

1. 
   (normative)
   
   Determination of the leaktightness of seat(s) and packing
   1. General

This annex specifies the test method for verifying the leaktightness of the seat and packing of a valve and the valve body made from PE.

• 1. Test piece

The test piece shall be a complete valve with the open ends closed off by, for example, covers, plugs, flexible seals or end connectors.

The setting time of moulded or fusion-jointed components, as specified by the manufacturer, shall be completed before commencing conditioning.

• 1. Procedure
     1. Conditioning

The test piece shall be conditioned at (23 ± 2) °C.

• • 1. Internal leaktightness test (fully-closed valve)

Conduct the following procedure. In case of bi-directional valves, both sides of the valves shall be tested:

a) connect one end of the test piece to the pressure line and the other end(s) to a device capable of detecting leakage

b) fill the closed test piece with air or nitrogen at the specified temperature

c) close the valve obturator

d) raise the pressure progressively and smoothly in such a way that the test pressure specified in Table 1 is attained within 30 s

e) maintain the pressure and temperature for the length of time specified in this document

f) observe and record any signs of leakage

g) depressurize the test piece.

Valves with independent double seating (such as two-piece obturator or double-seated valves) can be tested by applying pressure between the seats, and each side of the closed valve checked for leakage.

• • 1. External leaktightness test (half-open valve)

Conduct the following procedure:

a) put the valve in half open position

b) connect one end of the test piece to the pressure supply and close the other end

c) fill the test piece with air or nitrogen at the specified temperature

d) raise the pressure progressively and smoothly in such a way that the test pressure specified in this document, is attained within 30 s

e) maintain the pressure and temperature for the length of time specified in this document

f) observe and record any signs of external leakage

g) depressurize the test piece.

• 1. Test report

The test report shall include the following information:

a) reference to this document and the test method, i.e. ISO 4437-4:202X, Annex A ;

b) full identification of the valve under test;

c) test pressure(s), applied to the test piece;

d) test duration;

e) results of internal and external leaktightness testing;

f) any conditions or incidents not detailed by this test method and which might have affected the results;

g) date of the test.

1. 
   (normative)
   
   Test method for leaktightness and ease of operation after tensile loading
   1. Apparatus

The apparatus is composed of at least the equipment given in clauses B.1.1, B.1.2 and B.1.3.

• • 1. Tensile test machine.

A device capable of applying to a test piece and maintaining for a specified time period, t, a tensile force corresponding to a specified longitudinal tensile stress, σ_x, in the walls of pipes joined to the valve, and then if relevant producing a specified rate of extension. The tensile testing machine shall be sufficiently powerful to allow tests to be carried out up to the yield point of the pipe.

• • 1. Grips or couplings

Means to enable the tensile test machine (B.1.1) to apply the appropriate force, directly or through intermediate fittings.

• • 1. Pressurizing equipment

An equipment to enable a specified internal pressure, p, to be applied via suitable connections to the test piece while it is subject to the tensile force.

• 1. Test piece

The test piece shall comprise the valve under test assembled in accordance with 8.1 between two PE pipes, each of the nominal outside diameter, d_n, and the SDR series with which the valve is designed to be used, and each pipe having a length of either 2d_n or 250 mm, whichever is the shorter.

• 1. Conditions

The valves shall be tested using the following conditions:

a) nominal longitudinal tensile stress, σ_x, in the connected pipe wall shall be 12 MPa for PE 100 or PE 100-RC, and 10 MPa for PE 80;

b) internal pressure, p, shall be 25 ± 5 mbar or (0,5 ± 0,1) bar, maintained for the specified time period, t, see d);

c) tensile force shall be calculated using the nominal pipe dimensions;

d) time period, t, for which the tensile force is maintained steady shall be 1 h;

e) rate of extension between the grips equal to (25 ± 1) mm/min.

• 1. Procedure

The valve shall be tested by closing the obturator in the normal manner while maintaining an ambient test temperature of (23 ± 2) °C.

The following steps shall be performed:

1) Apply the specified internal pressure p, for internal leaktightness assessment before tensile testing (Annex A). In case of bi-directional valves, apply pressure to both sides. Ensure that all relevant parts of the valve are subject to the pressure.

2) After completion of the leaktightness test, mount the test piece in the tensile testing machine. Apply an increasing force smoothly until the applicable longitudinal stress, σ_x, is induced in the walls of the pipes in the test assembly

3) Maintain the force for the specified time period t.

4) Continue the tensile test by applying the specified rate of extension until one of the valve spigots ends or one of the pipes yields.

NOTE Yield is defined as a visible necking and elongation or a decrease of the load during the tensile test.

5) Remove the tensile load and, without any intervening operation of the valve, submit the valve to torque testing in accordance with ISO 8233, and leaktightness testing of the seat and packing according to Annex A.

Yielded pipe test pieces can be removed in order to perform the torque and leaktightness tests. If necessary additional pipes to help the performing of tests can be fused to the remaining spigots ends.

• 1. Test report

The test report shall include the following information:

a) reference to this document and the test method, i.e. ISO 4437-4^[3], Annex B;

b) full identification of the valve under test;

c) dimensions of the pipes used in the test piece;

d) longitudinal tensile stress, σ_x;

e) tensile force applied to the test piece;

f) internal pressure, p, applied to the test piece;

g) time period, t, for which the tensile force was maintained;

h) results of torque testing in accordance with ISO 8233;

i) results of leaktightness testing in accordance with Annex A;

j) any conditions or incidents not detailed by this test method and which might have affected the results;

k) date of the test.

Bibliography

[1] ISO/CD TS 4437‑7, Plastics piping systems for the supply of gaseous fuels - Polyethylene (PE) - Part 7: Guidance for the assessment of conformity

[2] ISO/TS 10839, Polyethylene pipes and fittings for the supply of gaseous fuels — Code of practice for design, handling and installation

[3] EN 736‑1, Valves — Terminology — Part 1: Definition of types of valves

[4] EN 736‑2, Valves — Terminology — Part 2: Definition of components of valves

[5] EN 736‑3:2008, Valves — Terminology — Part 3: Definition of terms

[6] ISO 5210, Industrial valves — Multi-turn valve actuator attachments

[7] Technical considerations when testing hydrogen valves with air - By Ernst van der Stok -https://www.kiwa.com/4ab63c/globalassets/netherlands/themas/bestanden/whitepaper-technical-con-testing-with-air-for-hydrogen-applications.pdf

[8] ISO 12176‑4, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 4: Traceability coding

[9] ISO 12176‑5, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 5: Two-dimensional data coding of components and data exchange format for PE piping systems

1. 1 bar = 0,1 MPa =10⁵ Pa; 1 MPa = 1 N/mm². ↑

2. Under preparation ↑

3. Under preparation ↑