Abstract
A material having appropriate corrosion resistance does not always have the mechanical or other properties which enable it to be used in a particular application. While coatings are often an effective answer, their limited thickness and integrity are often not sufficient for long term utilisation of readily available or economically viable materials. One way of applying thick (several millimetres) corrosion resistant layers to pressure tubing, which has been developed extensively in the past decade, is to coextrude the inner alloy and outer corrosion resistant alloy. In this paper, the requirements of and experience with this technique (particularly in the CEGB), its advantages and limitations, and potential future developments are described.
MST/1076
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