ISO 15590-1:2018 石油および天然ガス産業—パイプライン輸送システム用の誘導ベンド、フィッティングおよびフランジ—パート1：誘導ベンド | ページ 6

3.1

arc

curved portion of a bend

3.2

as agreed

agreed upon by the manufacturer and purchaser, and specified in the purchase order

3.3

bend angle

amount of directional change through the bend

3.4

bend qualification test

qualification test that produces a bend in accordance with the MPS and demonstrates that bends that meet the specified requirements of this document can be produced

3.5

bend radius

distance from the centre of curvature to the centreline axis of the bent pipe

3.6

chord

line segment connecting start and stop points of the bend zone measured at the centreline axis

3.7

defect

imperfection of a size and/or population density greater than the acceptance criteria specified in this document

3.8

extrados

outer curved section of the bend arc

3.9

heat

batch of steel prepared in one steel-making operation

3.10

if agreed

as prescribed, or more stringent than is prescribed, if agreed upon by the manufacturer and the purchaser and specified in the purchase order

3.11

imperfection

discontinuity or irregularity in the product wall or on the product surface that is detectable by inspection methods outlined in this document

3.12

indication

evidence obtained by non-destructive inspection

3.13

induction bending

continuous bending process that utilizes induction heating to create a narrow, circumferential, heated band around the material being bent

3.14

inspection

activities, such as measuring, examining, testing, weighing or gauging one or more characteristics of a product and comparing the results of such activities with the specified requirements in order to determine conformity

3.15

intrados

inner curved section of the bend arc

3.16

lamination

internal metal separation that creates layers, generally parallel to the pipe/bend surface

3.17

manufacturer

firm, company, or corporation responsible for making and marking the product in accordance with the requirements of this document

3.18

manufacturing procedure specification

MPS

document that specifies the properties and description of the mother pipe, the bending procedure, the post-bending heat treatment equipment and cycle, the qualification bend testing results, the non-destructive testing procedures and the weld end bevel details used for the manufacture of the bends

3.19

mother pipe

straight section of pipe from which an induction bend is made

3.20

non-destructive inspection

inspection to reveal imperfections, using radiographic, ultrasonic or other methods specified in this document that do not involve disturbance, stressing or breaking of the materials

3.21

purchaser

party responsible for both the definition of requirements for a product order and for payment of that order

3.22

submerged-arc welding

SAW

welding process that produces melting and coalescence of metals by heating them with an arc or arcs between a bare metal consumable electrode or electrodes and the workpiece, wherein the arc and molten metal are shielded by a blanket of granular flux

3.23

service condition

condition of use that is specified by the purchaser in the purchase order

Note 1 to entry: In this document, the terms “sour service” and “offshore service” are service conditions.

3.24

strip/plate end weld

weld that joins strip or plate ends together

3.25

tangent

straight section at the end of an induction bend

3.26

transition zone

area of the start and stop points of induction heating, which includes material that extends from the unheated mother pipe to the material that has been heated to the full bending temperature

3.27

wall thinning

amount of reduction from the original wall thickness of the pipe to the wall thickness in the extrados after bending