BS 1555-1:2021 pdf download – Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) Part 1: General 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. 5.3 Fusion compatibility 5.3.1 The compounds conforming to Table 1 shall be fusible. The compound manufacturer shall check that the requirement for the failure mode in a tensile test given in Table 2 is fulfilled for a butt fusion joint. The test sample shall be prepared by using the parameters specified in Annex A of ISO 11414:2009, at an ambient temperature of (23 ± 2) °C from pipes both manufactured from that compound. This shall be demonstrated by the compound manufacturer for each compound of his own product range. For 0,15 ≤ MFR < 0,20 compounds, fusion compatibility of pipes with diameter > 200 mm and wall thickness > 20 mm shall be investigated to confirm compatibility. If electrofusion is used, appropriate testing should be carried out to...
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