ISO 15590-4:2019 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工場ベンド、フィッティングおよびフランジ—パート4：工場コールドベンド | ページ 6

3.1

arc

curved portion of a bend

3.2

agreed

agreed upon by the manufacturer (3.17) and purchaser (3.21) , and specified in the purchase order

3.3

bend angle

amount of directional change through the cold bend

3.4

bend qualification test

qualification test that produces a cold bend in accordance with the MPS (3.18) 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 (3.11) of a size and/or population density greater than specific acceptance criteria

Note 1 to entry: The specific acceptance criteria are specified in ISO 3183.

3.8

extrados

outer curved section of the arc (3.1)

3.9

heat

batch of steel prepared in one steel-making operation

3.10

if agreed

required to be as prescribed, or more stringent than is prescribed, if agreed upon by the manufacturer (3.17) and the purchaser (3.21) and specified in the purchase order

3.11

imperfection

discontinuity or irregularity in the product wall or on the product surface that is detectable through inspection methods

3.12

indication

evidence obtained by non-destructive inspection (3.20)

3.13

cold bending

controlled bending process using presses at room temperature

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 arc (3.1)

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

3.18

manufacturing procedure specification

MPS

document that specifies the properties and description of the mother pipe (3.19) , the cold bending procedure, the post- bending heat treatment equipment and cycle, if applicable, the qualification bend testing results, the non-destructive testing procedures and the weld end bevel details used for the manufacture of the cold bends

3.19

mother pipe

straight section of pipe from which a cold bend is made

3.20

non-destructive inspection

inspection (3.14) to reveal imperfections (3.11) , using radiographic, ultrasonic or other methods that do not involve disturbance, stressing or breaking of the materials

3.21

purchaser

party responsible for both the definition of the requirements for a product order and the 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(s) between a bare metal consumable electrode(s) and the workpiece, wherein the arc (3.1) and molten metal are shielded by a blanket of granular flux

3.23

service condition

condition of use that is specified by the purchaser (3.21) in the purchase order

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

3.24

strip end weld

weld that joins strip ends together

3.25

plate end weld

weld that joins plate ends together

3.26

tangent

straight section at the ends of a cold bend

3.27

wall thinning

amount of reduction from the actual wall thickness of the pipe to the wall thickness in the extrados (3.8) after cold bending (3.13)