ISO 16486-5:2021 ガス燃料供給用のプラスチック配管システム—融着接合と機械接合を備えた非可塑化ポリアミド（PA-U）配管システム—パート5：システムの目的への適合性 | ページ 6

3.1

electrofusion joint

joint between a PA-U electrofusion socket or saddle fitting and a pipe or a spigot end fitting

Note 1 to entry: The electrofusion fittings are heated by the Joule effect of the heating element incorporated at their jointing surfaces, causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse.

3.2

butt fusion joint

joint made by heating the planed ends of matching surfaces by holding them against a flat heating plate until the PA-U material reaches fusion temperature, quickly removing the heating plate and pushing the two softened ends against one another

Note 1 to entry: This definition refers to a butt fusion joint using a heating tool.

3.3

fusion compatibility

ability of two unplasticized polyamide materials of the same type to be fused together to form a joint which conforms to the performance requirements of this part of ISO 16486

3.4

transition fitting

factory-made fitting that makes a transition joint (3.5) between a unplasticized polyamide (PA-U) piping and a metallic pipe as described in ISO 16486-3

Note 1 to entry: The metallic parts of the fitting may be assembled to metallic pipes by screw threads, compression joints, welded or flanged connections. The fitting can allow for either a dismountable or permanently assembled joint. In some cases, the supporting ring may also act as a grip ring.

3.5

transition joint

joint at which two different piping materials (the PA-U and metal piping) are connected