Heat fusion is widely used to join PE gas distribution piping, in which a variety of PE materials is used. There is uncertainty about the appropriate joining conditions for materials for which manufacturers' guidelines are unavailable. If materials could be classified into groups by their crossfusion compatibility, those in any one group could be fused at one set of conditions. Furthermore, materials in different groups could be fused at a set of conditions determined by the two groups rather than the two materials. The physical properties of five materials most extensively used by New York Gas Group were obtained and analyzed and then classified into groups with similar properties, resulting in an example classification and suggesting that a methodology based on classifying the materials according to similarity of properties is possible and beneficial.
Appendixes contain descriptions of fusion procedures, and butt and saddle joint data.
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