Verification of butt fusion weld quality in large diameter PE100 water pipes [PE]
# 1995 Edinburgh
The &ect of pipe wall thickness and welding parameters on the joint quality of bun fusion welded
PElOO water pipes has been investigated using notched Charpy impact testing and tensile testing.
The conventional U.K. Water Industry weld tensile test does not give a geometry independent
measurement of weld ductility but is influenced by pipe wall thickness. The thicker walled pipes give
weld ductility values apparently significantly lower than those of the thinner walled pipe welds.
By using Charpy impact testing a wide range of wall thicknesses have been investigated with a constant
specimen geometry. Impact testing has the added advantage that samples can be notched at selective
positions in the weld zone thereby yielding more information about the weld smchlre. Impact test
results confirm that a uniform weld quality can be maintained over the wall thickness range of 12 to
60mm found with these pipes.
A modified weld tensile test method has been developed which gives equivalent corresponding weld
ductility values for this wall thickness range veriiying the quality of welds in thick walled PElOO pipes
when produced using the new recommended welding procedures.
Please note that the whole article content is available on PPCA website only
Polyethylene (PE) based and metallic pipe systems have been assessed for
their ability to stop petrol migrating through the pipe wall, fitting or joint and
into water contained within the pipe. A quantitative test was devised that is
capable of distinguishing between the different pipe systems. Plain PE pipe...
The United Kingdom is the most highly developed PE pressure pipe market in the world.
Following pioneering work done in the USA and Germany, it was the UK that was first to
adopt PE on a large scale for gas, and then for water distribution. The 100% PE policy of
British Gas, and wide range of sizes used (at low...
Butt fusion welding is the most reliable and unobtrusive method of joining PE pipes
(and spigot fittings) of virtually any size-except perhaps the smallest where other methods
are usually preferred. It is the dominant method of jointing both medium and large pipe
sizes, but for different reasons. In medium pipe sizes...
An outline is given of the main processes employed for the manufacture of multilayered GRP pipes intended for the conveyancing of both water and contaminated fluids, where high strength and light weight lead to cost and/or transportation benefits. The analysis presented, which is based on Sanders’ thin shell theory...
Notched ring sections of extruded pipe and injection moulded fittings have been tested to induce brittle failure which can be described by LEFM theory. Failure times have been measured at a range of applied stress intensity factors for each material tested at 23~C. The influence of processing, batch/batch variation in...