Pipes in Extreme Conditions # 1979 Brigthon
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 design of pipework systems where reference is made to the established analytical procedures used for metallic pipework.
Glassfibre reinforced plastics have gained wide acceptance in many Industries as engineering materials, and have probably shown their highest potential in the Chemical Plant Process Judustry where they generally have to exhibit both optimum chemical resistance and structural reliability.
since difierent forms of glass fibre reinforcements may have either isotropic or anisotropic properties, their use in a composite structure can often allow a degree of freedom of design rarely achieved with metallic materials.
However, in detail desipn analysis their use can show the deficiencies of conventional methods of analysis, since in the main these have been established for isotropic materials and to translate them for anisotropic properties often prohibitedly complicates any theory or calculation. Because of the effects of anisotropy often only field experience may provide data on which to postulate the possible performance of different combinations of reinforcement.
Author(s) : Gray, Powell, Bonner
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...
Author(s) : Selwood, Parson, Gray
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...
Author(s) : Gray, Frye
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...
Author(s) : Price, Gray
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...
Author(s) : Gray
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...