BS EN 1555-3-2021 PDF

Full title and description

STB BS EN 1555-3:2021 — Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings. This European Standard specifies the characteristics, test parameters and performance requirements for fusion (PE) and mechanical fittings intended for gas distribution piping systems.

Abstract

EN 1555-3:2021 defines material, geometric, mechanical and physical requirements and associated test methods for polyethylene fusion fittings and for mechanical fittings used in the supply of gaseous fuels. It is intended to be used together with other parts of EN 1555 (Parts 1, 2, 4 and 5) and references related test and installation standards. The document covers typical fitting types (electrofusion sockets and saddles, spigot end fittings for butt/electrofusion and mechanical couplers) and gives provisions for marking, technical files and delivery conditions.

General information

• Status: Current European standard (adopted nationally in CEN member bodies; available as BS EN where adopted by BSI).
• Publication date: 2021 (approved by CEN in 2021; national publications/adoptions issued mid‑2021 to late‑2021).
• Publisher: European Committee for Standardization (CEN); available via national standards bodies (e.g., BSI, NSAI, DIN).
• ICS / categories: Relevant ICS fields include gas supply systems and plastics piping — examples: 91.140.40; 83.140.30; 23.040.45.
• Edition / version: EN 1555-3:2021 (most recent edition published in 2021).
• Number of pages: 38 pages (typical published PDF length for EN 1555-3:2021 editions sold by national bodies).

Scope

EN 1555-3:2021 applies to polyethylene fusion fittings and mechanical fittings for piping systems intended for the supply of gaseous fuels when used together with Parts 1, 2, 4 and 5 of EN 1555. It is applicable for systems with a maximum operating pressure (MOP) up to and including 10 bar (reference temperature 20 °C) and for an operating temperature range typically from −20 °C to +40 °C; the standard also gives requirements for joints between PE components and components of other materials and specifies referenced test methods. The standard covers common fitting forms (couplers, tees, reducers, saddles, elbows, caps) and installation-relevant fitting types (electrofusion socket and saddle fittings, spigot end fittings for butt fusion and electrofusion, and mechanical fittings).

Key topics and requirements

• Material requirements — PE compound for stress-bearing parts must conform to EN 1555‑1; restrictions on use of reworked material for stress-bearing elements.
• Geometrical and dimensional characteristics — specified nominal dimensions, joint forms and allowable tolerances for fusion and mechanical fittings.
• Mechanical and physical properties — tensile, creep and short-term pressure test requirements for fittings and fitting/pipe assemblies.
• Performance limits — design MOP up to 10 bar at 20 °C and defined operating temperature range with applicable derating rules referenced to other parts of EN 1555.
• Types of fittings covered — electrofusion socket and saddle, spigot end (butt/electrofusion), and mechanical fittings (couplers, tees, reducers, elbows, saddles, caps).
• Compatibility and durability — requirements for non‑PE parts, sealing materials (reference to EN 682 for elastomeric seals), and corrosion protection for metal parts.
• Marking, technical file and delivery conditions — mandatory marking information, required technical documentation and packaging/delivery requirements.
• Referenced test methods and annexes — includes normative annexes for short-term pressure test and tensile tests for fitting/pipe assemblies.

Typical use and users

This standard is used by gas distribution utilities, piping system designers and engineers, fittings and component manufacturers, testing and certification bodies, conformity assessment organizations, installation contractors and national standards/regulatory authorities. It is used for product specification, type testing, product certification, procurement and to ensure interoperability and safety of PE gas distribution fittings.

Related standards

EN 1555 is a multi‑part system. Closely related documents include EN 1555‑1 (General), EN 1555‑2 (Pipes), EN 1555‑4 (Valves), EN 1555‑5 (Fitness for purpose / performance), and guidance/installation references such as EN 12007‑2 and CEN/TS 1555‑7; sealing materials are referenced to EN 682. EN 1555‑3:2021 replaces the earlier EN 1555‑3 editions (2010/2012 series).

Keywords

PE fittings; electrofusion; butt fusion; mechanical fittings; gas distribution; MOP 10 bar; EN 1555; piping systems; polyethylene; test methods; marking; durability.

FAQ

Q: What is this standard?

A: EN 1555-3:2021 is the part of the EN 1555 series that specifies requirements and test methods for polyethylene fusion fittings and mechanical fittings used in the supply of gaseous fuels.

Q: What does it cover?

A: It covers material requirements, geometry, mechanical and physical characteristics, performance criteria, test parameters (including short‑term pressure and tensile tests), marking and delivery conditions for PE and mechanical fittings used in gas distribution systems, for systems up to 10 bar MOP and in the common service temperature range.

Q: Who typically uses it?

A: Manufacturers of PE fittings, gas network operators, designers, testing and certification bodies, installers and procurement/specification teams use this standard to design, test, certify and specify fittings for gas distribution.

Q: Is it current or superseded?

A: EN 1555-3:2021 is the current edition published in 2021 and supersedes earlier editions (for example EN 1555‑3:2010 with A1:2012). National adoptions (BS EN, DIN EN, etc.) reflect the 2021 edition.

Q: Is it part of a series?

A: Yes — EN 1555 is a system standard in multiple parts: Part 1 (General), Part 2 (Pipes), Part 3 (Fittings), Part 4 (Valves) and Part 5 (Fitness for purpose), plus related technical specifications and guidance documents.

Q: What are the key keywords?

A: PE fittings, electrofusion, butt fusion, mechanical fittings, gas supply, MOP 10 bar, marking, test methods, EN 1555.