BS 8561:2021 pdf download – Specification for mechanical fittings for use in the repair, connection and renovation of pressurized water supply pipelines — Requirements and test methods

BS 8561:2021 pdf download.Specification for mechanical fittings for use in the repair, connection and renovation of pressurized water supply pipelines — Requirements and test methods 3.7wide tolerance coupling mechanical fitting capable of connecting a range of pipe materials and/or pipe dimensions providingconnection between two pipe spigot ends 3.8wide tolerance step coupling mechanical fitting capable of connecting a range of pipe materials and /or pipe dimensions providingconnection between two pipe spigot ends of different outside diameter 3.9dedicated flange adaptor mechanical fitting providing connection between a spigot and a flange NOTE For repair of existing water supply pipes, flange adapters are designed such that they can slide over thepipe spigot or have a setting gap to facilitate assembly. 3.10wide tolerance flange adaptor mechanical fitting capable of connecting a range of pipe materials and/or pipe dimensions providingconnection between a spigot and a flange NOTE For repair of existing water supply pipes, flange adapters are designed such that they can slide over thepipe spigot or have a setting gap to facilitate assembly. 3.11repair clamp mechanical fitting installed around a leaking pipe barrel to affect a seal on both local andcircumferential pipe defects 3.12joint encapsulation unit mechanical fitting installed around a leaking pipe joint that seals to both sections of pipe barrel eitherside of the joint forming a pressure-tight container to contain the leakage 3.13under pressure tee mechanical fitting installed on/around a pipe to create a branch connection usually terminating in aflange outlet NOTE1 The fitting, along with other equipment and fittings, facilitates a live connection to the pipe withoutinterruption to the supply flowing through it. NOTE 2 Under pressure tees may have full pipe surface contact sealing to accommodate the branch connection andalso any circumferential cracking which might occur. 3.14barrier pipe multi-layer pipe consisting of two polyethylene layers with an intervening aluminium barrier layerthat together provide the necessary strength and resistance to permeation 3.15nominal pressure (PN) numerical designation which is a convenient rounded number for reference purposes NOTEFor plastic piping systems conveying water, it corresponds to the maximum continuous operating pressure,expressed in bar, which can be sustained with water as 20 °C, based on the minimum design coefficient. 3.16pipe nominal size (DN) nominal size,related to the outside diameter3.17standard dimension ratio (SDR) numerical designation of a pipe series, which is a convenient round number, approximately equal tothe dimension ratio of the nominal outside diameter, DN, and the nominal wall thickness,EN 3.18end load resistance resistance to...