The Resistance of PE Water Pipeline Systems to Surge Pressure [PE]

Testing Specification Design # 1995 Edinburgh

The guldeUnes g h n in BS CP 312 :Pwt 2 : 1973 w e recommended to the UK toater industryfor the deslgn of polyethylene pfpeline systems to toke inin account the effects of tmnsient [surge) pressurejluctuatlons with respect to fatigue (ref.1). These guIdelInes we based on earlier experience wlth PVC-Usewer h i n g molns and are generally considered too conservativefor moreflexIble polgethylene systems. A group representing the IIK water industry induding a materlal supplier. product ~ ~ e rwid swater. oompanles wasjormed in 199i m discuss and Lnwstlgate thls apparent anomnly. With the aid of measurement on a number of in-service instdatfons known to experience surge pressures. a marlmum rate of change of pressure reaUsttmlly possible durlng a surge event was established. This rate of pressure change was used in high amplitude q d l c pressure tests carried out Ln the laboratory on notched pipe andfftWtg assemblies. Nofailures or dlscemible deterioration occured 01any ofthe products sutJ& to this repeated cydlc testing. designed to slrnulate the number of worst case eventsfeasible Ln theprojected lifetime. In conclusion it is conlffrmed that the current guidelines we indeed w y consenntlw and alternatlw remmmendations are proposed which should be applled to polyethylene pipe systems up to at least 180 mm diameter without delay.

Please note that the whole article content is available on PPCA website onlySource : 1995 Edinburgh


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