BS ISO 17885:2021 pdf download – Plastics piping systems — Mechanical fittings for pressure piping systems — Specifications 5.5 Lubricants and/or greases Lubricants and/or greases may be used to assist in joint assembly. The fitting manufacturer shall provide evidence that the lubricant and/or grease shall not have a deleterious effect on the performance of the component parts of the fitting likely to be in contact or of the connecting piping system. NOTE Requirements for GAS can be found in EN 377. 6 General characteristics 6.1 Appearance When viewed without magnification, the internal and external surfaces of fittings shall be smooth, clean and shall have no scoring, cavities and other surface defects to an extent that would prevent conformity to this document. No component of the fitting shall show any signs of damage, scratches, pitting, bubbles, blisters, inclusions or cracks to an extent that would prevent conformity of the fittings to the requirements of this document. 6.2 Colour The colour shall conform to the requirements given in the relevant product standards. For W applications, plastic body material other than black shall be tested in accordance with ISO 7686; the percentage of light which passes through the wall of the fitting shall be less than or equal to 0,2 %. 6.3 Weathering protection The fitting parts, which are exposed to and affected by weathering, shall be protected against weathering. 6.4 Threads Joints made pressure-tight by the mating of the threads shall conform to ISO 7-1 and fastening pipe threads to ISO 228-1. NOTE If an International Standard with the same content as ISO 7-1 exists, e.g. EN 10226-1 and EN 10226-2, conformance may alternatively be considered as acceptable. 6.5 Transition fittings to metal pipes Where a fitting is connected to a metal pipe, the joint shall fulfil at least the performance requirements of the plastic pipe systems. The fitting part connected to the metal pipe shall fulfil the dimensional requirements of the corresponding metal product standards. 6.6 Combined fittings Socket fusion ends, spigot ends, electrofusion sockets or others, when included in mechanical fittings, shall conform to the relevant product standards 6.7 Twisting The fitting shall not induce twisting of pipes during assembly. 7 Geometrical characteristics The mechanical fittings shall be manufactured with such dimensions and within such tolerances as will permit their use with pipes conforming to the corresponding product standard. Stiffeners are recommended for thin wall pipes (e.g. polyethylene pipes) for...
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