ISO 14723:2009 石油および天然ガス産業—パイプライン輸送システム—海底パイプラインバルブ | ページ 6

4.1

ASME rating class

numerical pressure design class defined in ASME B16.34 and used for reference purposes

Note 1 to entry: The ASME rating class is designated by the word “Class” followed by a number.

[SOURCE:ISO 14313:2007, 4.1]

4.2

bi-directional valve

valve designed for blocking the fluid in both downstream and upstream directions

[SOURCE:ISO 14313:2007, 4.2]

4.3

bleed

drain or vent

[SOURCE:ISO 14313:2007, 4.3]

4.4

block valve

gate, plug or ball valve that blocks flow into the downstream conduit when in the closed position

Note 1 to entry: Valves are either single- or double-seated, bi-directional or uni-directional.

[SOURCE:ISO 14313:2007, 4.4]

4.5

breakaway thrust

breakaway torque

maximum thrust or torque required to operate a valve at maximum pressure differential

[SOURCE:ISO 14313:2007, 4.5]

4.6

by agreement

agreed between manufacturer and purchaser

[SOURCE:ISO 14313:2007, 4.6]

4.7

double-block-and-bleed valve

DBB

single valve with two seating surfaces that in the closed position provides a seal against pressure from both ends of the valve with a means of venting/bleeding the cavity between the seating surfaces

[SOURCE:ISO 14313:2007, 4.7]

4.8

double-isolation-and-bleed valve

DIB

single valve with two seating surfaces, each of which in the closed position provides a seal against pressure from a single source, with a means of venting/bleeding the cavity between the seating surfaces

Note 1 to entry: This feature can be provided in one direction or in both directions.

[SOURCE:ISO 14313:2007, 4.8]

4.9

drive train

all parts of a valve drive between the operator and the obturator, including the obturator but excluding the operator

[SOURCE:ISO 14313:2007, 4.9]

4.10

flow coefficient

K_v

volumetric flow rate of water at a temperature between 5 °C (40 °F) and 40 °C (104 °F) passing through a valve and resulting in a pressure loss of 0,2 MPa (1 bar, 14,7 psi)

Note 1 to entry:K_v is expressed in SI units of cubic metres per hour.

Note 2 to entry:K_v is related to the flow rate coefficient, C_v, expressed in USC units of US gallons per minute at 15,6 °C (60 °F) resulting in a 1 psi pressure drop as given by Equation (1):

(1)

[SOURCE:ISO 14313:2007, 4.10]

4.11

full-opening valve

valve with an unobstructed opening not smaller than the internal bore of the end connections

[SOURCE:ISO 14313:2007, 4.11]

4.12

handwheel

wheel consisting of a rim connected to a hub, for example by spokes, and used to operate manually a valve requiring multiple turns

[SOURCE:ISO 14313:2007, 4.12]

4.13

locking device

part or an arrangement of parts for securing a valve in the open and/or closed position

[SOURCE:ISO 14313:2007, 4.13]

4.14

manual actuator

manual operator

wrench (lever) or handwheel with or without a gearbox

[SOURCE:ISO 14313:2007, 4.14]

4.15

maximum pressure differential

MPD

maximum difference between the upstream and downstream pressure across the obturator at which the obturator may be operated

[SOURCE:ISO 14313:2007, 4.15]

4.16

nominal pipe size

NPS

numerical imperial designation of size, which is common to components in piping systems of any one size

Note 1 to entry: Nominal pipe size is designated by the abbreviation “NPS” followed by a number.

[SOURCE:ISO 14313:2007, 4.16]

4.17

nominal pressure class

PN

numerical pressure design class used for reference purposes

Note 1 to entry: Nominal pressure class is designated by the abbreviation “PN” followed by a number.

[SOURCE:ISO 14313:2007, 4.17]

4.18

nominal size

DN

numerical metric designation of size that is common to components in piping systems of any one size

Note 1 to entry: Nominal size is designated by the abbreviation “DN” followed by a number.

[SOURCE:ISO 14313:2007, 4.18]

4.19

obturator

closure member

part of a valve, such as a ball, clapper, disc, gate or plug that is positioned in the flow stream to permit or prevent flow

[SOURCE:ISO 14313:2007, 4.19]

4.20

operator

device (or assembly) for opening or closing a valve

[SOURCE:ISO 14313:2007, 4.20]

4.21

packing gland

component used to compress the stem packing

[SOURCE:ISO 14313:2007, 4.21]

4.22

piggability

capability of a valve to permit the unrestricted passage of a pig

[SOURCE:ISO 14313:2007, 4.23]

4.23

pipe pup

transition piece

piece(s) of pipe or forged material, welded to the valve to prevent valve-seal damage from girth welding, for matching of valve material to pipeline strength properties, or to provide a valve end matching the pipeline dimensions

4.24

position indicator

device to show the position of the valve obturator

[SOURCE:ISO 14313:2007, 4.22]

4.25

powered operator

powered actuator

electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and closing of the valve

[SOURCE:ISO 14313:2007, 4.24]

4.26

pressure cap

cap designed to contain internal pressure in the event of seal leakage or to prevent ingress due to hyperbaric pressure

Note 1 to entry: A pressure cap may also be used for protection; see 4.36.

4.27

pressure class

numerical pressure design class expressed in accordance with either the nominal pressure (PN) class or the ASME rating class

Note 1 to entry: In this International Standard, the pressure class is stated by the PN class, followed by the ASME rating class in parentheses.

[SOURCE:ISO 14313:2007, 4.25]

4.28

pressure-containing parts

parts whose failure to function as intended results in a release of contained fluid into the environment

[SOURCE:ISO 14313:2007, 4.26]

4.29

pressure-controlling parts

parts, such as seat and obturator, intended to prevent or permit the flow of fluids

[SOURCE:ISO 14313:2007, 4.27]

4.30

process-wetted parts

parts exposed directly to the pipeline fluid

[SOURCE:ISO 14313:2007, 4.28]

4.31

reduced-opening valve

valve with the opening through the obturator smaller than at the end connection(s)

[SOURCE:ISO 14313:2007, 4.29]

4.32

remote-operated vehicle

ROV

underwater vehicle operated remotely from a surface vessel or installation

4.33

seating surfaces

contact surfaces of the obturator and seat which ensure valve sealing

[SOURCE:ISO 14313:2007,4.30]

4.34

shaft

part of a check valve that connects the obturator to the operator and that can consist of one or more components

4.35

stem

part that connects the obturator to the operator and that can consist of one or more components

[SOURCE:ISO 14313:2007, 4.31]

4.36

stem/shaft protector

cover to protect valve parts from mechanical damage

Note 1 to entry: A pressure cap may also be used for protection.

4.37

support ribs or legs

metal structure that provides a stable footing when the valve is set on a fixed base

[SOURCE:ISO 14313:2007, 4.33]

4.38

through-conduit valve

valve with an unobstructed and continuous cylindrical opening

[SOURCE:ISO 14313:2007, 4.34]

4.39

uni-directional valve

valve designed for blocking the flow in one direction only

[SOURCE:ISO 14313:2007, 4.35]

4.40

unless otherwise agreed

unless the manufacturer and purchaser agree on a deviation

4.41

unless otherwise specified

unless the purchaser specifies otherwise