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Long term failure of plastics pipes is governed by very slow crack propagation. Assessing pipe materials' resistance to this slow growth is time consuming and in the case of recent very tough medium density polyethylenes is difficult using constant load tests. It is shown that fatigue tests can achieve comparative results in an acceptable time scale and rank these materials in the same order as other longer term tests of real performance.
The fatigue method thus has potential for assessing very tough grades.
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Aliphatic polyketones are a family of polymers prepared by the polymerisation of olefins and carbon monoxide in a perfectly alternating sequence. BP Chemicals produces these materials using a proprietary palladium catalyst in a continuous polymerisation process.
They are crystalline thermoplastics which offer a unique...
The process of die-drawing has been investigated as a means of
producing oriented polyethylene pipe. Two materials, one homopolymer
and one copolymer, have been successfully drawn into pipe. When
compared with isotropic pipes the oriented products exhibit enhanced
mechanical and physical properties and produce a novel...
Pipework constructed in glassfibre composites is now used in many Process Industries. The design methods derived for these materials have shown that they exhibit characteristics not usually considered in general engineering design.
These concepts are briefly described together with their relevance in the overall...
The properties of HDPE pipe materials necessary to satisfy processing and performance requirements are considered. Methods of predicting pipe performance are discussed, and experimental data are presented to support the predictive technique.
High density polyethylene is now well established as one of the major...
The Paper considers some of the fundamental problems in the design of reinforced plastics, out lining the major engineering concepts which are applied when designing pipework, or plant in such materials. To be able to demonstrate the major differences between conventional materials and reinforced plastics, the...
