ISO 15590-1:2024 低炭素エネルギーを含む石油およびガス産業 — パイプライン輸送システムの工場のベンド、継手およびフランジ — Part 1:誘導ベンド | ページ 5

3.1

arc

curved portion of a bend

3.2

bend angle

amount of directional change through the bend

3.3

bend qualification test

BQT

qualification test that produces a bend in accordance with the MPS (3.20) and demonstrates that bends that meet the specified requirements can be produced

Note 1 to entry: Clause 10 specifies requirements for bends.

3.4

bend radius

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

3.5

by agreement

agreed between the manufacturer (3.19) and the purchaser (3.23)

[SOURCE:ISO 15590-2:2021, 3.1]

3.6

chord

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

3.7

defect

imperfection (3.12) of a size and/or population density greater than the specified acceptance criteria

Note 1 to entry: 10.5 and Clause B.7 specify the acceptance criteria.

3.8

extrados

outer curved section of the bend arc (3.1)

3.9

global heating technology

induction bending (3.14) process in which the entire bend including arc (3.1) and tangent (3.27) sections is pushed through the induction heating coil and heated to the full bending temperature

3.10

heat

batch of steel prepared in one steel-making operation

3.11

if agreed

as prescribed, or more stringent than is prescribed, if achieved consensus by the manufacturer (3.19) and the purchaser (3.23) and specified in the purchase order

[SOURCE:ISO 24139-2:2023, 3.1.5]

3.12

imperfection

discontinuity or irregularity in the product wall or on the product surface that is detectable by inspection (3.15) methods outlined in this document

3.13

indication

evidence obtained by non-destructive inspection (3.22)

3.14

induction bending

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

3.15

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

3.16

intrados

inner curved section of the bend arc (3.1)

3.17

lamination

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

3.18

local heating technology

induction bending (3.14) process in which only the arc (3.1) of a bend is pushed through the induction heating coil and heated to the full bending temperature

3.19

manufacturer

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

Note 1 to entry: Clauses 9 and 10 specify requirements for manufacturers.

3.20

manufacturing procedure specification

MPS

document that specifies the properties and description of the mother pipe (3.21) , the bending procedure, the post-bending heat treatment equipment and cycle (if needed), the qualification bend testing results, the non-destructive testing procedures and the weld end bevel details used for the manufacture of the bends

3.21

mother pipe

straight section of pipe from which an induction bend is made

3.22

non-destructive inspection

inspection (3.15) to reveal imperfections (3.12) , using radiographic, ultrasonic or other methods specified in this document that do not involve disturbance, stressing or breaking of the materials

3.23

purchaser

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

3.24

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

[SOURCE:ISO 15590-4:2019, 3.22]

3.25

service condition

condition of use that is specified by the purchaser (3.23) in the purchase order

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

3.26

end weld

weld that joins strip or plate ends together

3.27

tangent

straight section at the end of an induction bend

3.28

transition zone

area of the start and stop points of induction heating, which includes material that extends from the unheated mother pipe (3.21) to the material that has been heated to the full bending temperature

3.29

wall thinning

amount of reduction from the original wall thickness of the pipe to the wall thickness in the extrados (3.8) after bending