ISO/TS 10839:2022 ガス燃料の供給のためのポリエチレンパイプおよびフィッティング—設計、取り扱い、および設置の実施基準 | ページ 5

3.1.1

butt fusion machine pressure

pressure indicated on the gauge or on a pressure display on a butt fusion machine, giving an indication of the interface force applied to the pipe and/or fitting ends

3.1.2

clearance

shortest distance between the outer limits of two objects

3.1.3

drag resistance

frictional resistance due to the weight of the length of pipe fixed in the moveable clamp at the point at which movement of the moveable clamp is initiated (peak drag), or the friction occurring during movement (dynamic drag)

3.1.4

electrofusion control unit

equipment implementing the output fusion parameters of voltage or current and time or energy to execute the fusion cycle as specified by the electrofusion fitting manufacturer

3.1.5

frictional losses in the butt fusion machine

force necessary to overcome friction in the whole mechanism of a butt fusion machine

3.1.6

fusion operator

person trained to carry out fusion jointing between polyethylene (PE) pipes and/or fittings

Note 1 to entry: Fusion jointing is based on a written procedure agreed by the pipeline operator

Note 2 to entry: The fusion operator is trained for one or more fusion–jointing procedures

3.1.7

interface force

force between the fusion surfaces of the pipe(s) and/or fitting(s) during the fusion cycle, as specified in the fusion diagram

3.1.8

operator

person authorized to build polyethylene (PE) systems from pipes and/or fittings, based on a written procedure agreed by the pipeline operator

3.1.9

overall service (design) coefficient

C

overall coefficient, with a value greater than 1, which takes into consideration service conditions as well as properties of the components of a piping system

3.1.10

pipeline operator

private or public organization authorized to design, construct and/or operate and maintain a gas supply system

3.1.11

soil cover

vertical distance between the top of a buried pipe and the normal surface after finishing work