BS EN 1555-1:2021 pdf free download – Plastics piping systems for the supply of gaseous fuels一Polyethylene (PE) Part 1: General.
3.4.2
maximum operating pressure
MOP
maximum effective pressure of the fluid in the piping system, expressed in bar, which is allowed in continuous use
Note 1 to entry: It is expressed in bar and takes into account the physical and the mechanical characteristics of the components of a piping system and it is calculated using the following equation:
Note 2 to entry: Research on longterm performance prediction of PE water and gas distribution systems shows a possible service life of at least 100 years, see Bibliography liii, [121 and [13].
3.4.3
reference temperature
temperature for which the piping system is designed
Note 1 to entry: It is used as the base for further calculation when designing a piping system or parts of a piping system for operating temperatures different from the reference temperature.
3.5 Definitions related to joints
3.5.1
butt fusion joint using heated tool
joint made by heating the planed ends of pipes or spigot end fittings, the surfaces of which mate by holding them against a flat heating plate until the PE material reaches fusion temperature, removing the heating plate quickly and pushing the two softened ends against one another
3.5.2
fusion compatibility
ability of two similar or dissimilar polyethylene compounds to be fused together to form a joint which conforms to the performance requirements of this document
3.5.3
electrofusion joint
joint between a PE socket or saddle electrofusion fitting and pipe or fitting with spigot ends, made by heating the electrofusion fittings by the Joule effect of the heating element incorporated at their jointing surfaces, causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse
3.5.4
mechanical joint
joint made by assembling a PE pipe to another PE pipe, or any other element using a fitting that generally includes a compression part. to provide for pressure integrity. leaktightness and resistance to end loads
4 Symbols and abbreviations
4.1 Symbols
For the purposes of this document, the following symbols apply.
5 Material
5.1 Material of the components
The pipes, fittings and valves shall be made of polyethylene compound conforming to this document. This document includes materials classified PE 80 and PE 100.
In addition another type of PE 100 designated PE 100-RC with enhanced resistance to slow crack growth is included in this document, see Annex A for additional information.
The material described in this document is a compound which shall be supplied in the form of granules, suitable for the production of pipes complying with EN 1555-2, fittings complying with EN 1555-3, or valves complying with EN 1555-4.
5.2 Compound
5.2.1 Additives and pigments
The compound shall be made by the material producer by adding to the polyethylene base polymer only those additives, pigments (e.g. carbon black) necessary for the manufacture of pipes, fittings and valves conforming to EN 1555-2:2021, EN 1555-3:2021 or EN 1555-4:2021, as applicable, and for their fusibility, storage and use.
The carbon black used in the production of black compound shall have an average (primary) particle size of 10 nm to 25 nm.
All additives and pigments shall be uniformly dispersed.
5.2.2 Colour
The colour of the compound shall be yellow (PE 80), orange (PE 100 and PE 100-RC), or black (PE 80. PE 100 and PE 100-RC).
5.2.3 Characteristics
5.2.3.1 Characteristics of the compound in the form of granules
The compound in the form of granules used for the manufacture of pipes, fittings and valves shall have characteristics conforming to the requirements given in Table 1.