ISO 4437-3:2024
Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 35
- Дата публикации:
- 14 февраля 2024 г.
- Издание:
- ISO IS 4437 edition 2 version 1
- ICS:
- 75.200
This document specifies the characteristics of fusion fittings made from polyethylene (PE) as well as of mechanical fittings for piping systems in the field of the supply of gaseous fuels. It also specifies the test parameters for the test methods referred to in this document. In conjunction with ISO 4437-1, ISO 4437-2, ISO 4437-4 and ISO 4437-5, this document is applicable to PE pipes, fittings and valves, their joints, and 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; b) an operating temperature between −20 °C and 40 °C. For operating temperatures between 20 °C and 40 °C, derating coefficients are defined in ISO 4437-5. The ISO 4437 series 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 is applicable for fittings of the following types: — electrofusion socket fittings; — electrofusion saddle fittings; — spigot end fittings (for butt fusion using heated tools and electrofusion socket fusion); — socket fusion fittings; — mechanical fittings. NOTE 1 The fittings can be, for example, in the form of couplers, saddles, equal and reduced tees, reducers, elbows, bends or end caps. NOTE 2 Fabricated fittings are normally not used for gas applications except for larger dimensions or in the absence of other solutions. Guidance can be found in ISO 4427-3:2019, Annex B. [1] 1 bar = 0,1 MPa = 105 Pa; 1 MPa = 1 N/mm2.
Abstract
Overview
ISO 4437-3:2024 specifies the characteristics and test parameters for polyethylene (PE) fittings used in plastics piping systems for the supply of gaseous fuels. It covers both fusion fittings (electrofusion socket, electrofusion saddle, spigot end, socket fusion) and mechanical fittings, and is intended for systems designed up to a maximum operating pressure (MOP) of 10 bar (reference 20 °C) with an operating temperature range of −20 °C to 40 °C. The standard is part of the ISO 4437 series for PE gas distribution systems and defines material, geometrical, mechanical, physical and performance requirements for fittings.
Key topics and technical requirements
- Material requirements: PE compounds for fittings, inclusion of PE 100‑RC (enhanced slow crack growth resistance) and provisions for non‑PE components (metal parts, seals).
- Fitting types: Electrofusion socket fittings, electrofusion saddle fittings, spigot end fittings (for butt fusion and electrofusion), socket fusion fittings, and mechanical fittings (couplers, tees, reducers, elbows, end caps).
- Design & geometry: Dimensions, wall thicknesses, spigot and socket lengths, out‑of‑roundness limits and measurement methods for different fitting types.
- Mechanical & physical characteristics: Conditioning, tensile and pressure performance, requirements for modifications and factory‑made joints.
- Performance & testing: Test parameters and normative test methods (short‑term pressure tests, tensile tests for fitting/pipe assemblies) and performance verification for fitness‑for‑purpose.
- Electrical characteristics: Requirements relevant to electrofusion fittings and system compatibility.
- Marking & technical information: Minimum marking, fusion system recognition and delivery conditions to aid traceability and installation.
- Scope limits & selection: Derating coefficients for temperatures above 20 °C (see ISO 4437‑5), colour and pressure series selection responsibility lies with the purchaser/specifier.
Applications and who uses it
- Utility owners and gas distribution operators specifying PE fittings for low‑ and medium‑pressure gas networks.
- Manufacturers of PE fittings and electrofusion systems ensuring product compliance.
- Pipeline designers, installers and contractors implementing fusion and mechanical jointing methods.
- Testing laboratories and conformity assessment bodies performing required tests.
- Regulators and procurement teams referencing harmonized requirements for safety, performance and interchangeability.
Related standards
- ISO 4437-1, ISO 4437-2, ISO 4437-4, ISO 4437-5 (system materials, pipes, valves and fitness‑for‑purpose)
- ISO/TS 10839 (recommended practice for design, handling and installation)
- ISO 4427-3:2019 (guidance on fabricated fittings)
Keywords: ISO 4437-3:2024, polyethylene (PE) fittings, electrofusion fittings, mechanical fittings, plastics piping systems, gas supply, PE 100-RC, MOP 10 bar.
Технические детали
- Технический комитет
- ISO/TC 138/SC 4 - Plastics pipes and fittings for the supply of gaseous fuels
- SKU
- ISO 4437-3:2024
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