ISO 10524-2:2018 医療ガスで使用するための圧力調整器 — Part 2: マニホールドおよびライン圧力調整器 | ページ 6

3.1

closure pressure

P₄

stabilized outlet pressure, after cessation of the flow, from a pressure regulator( 3.15 ) when the flow has been set to standard discharge( 3.20 )

3.2

double-stage pipeline distribution system

pipeline distribution system in which gas is initially distributed from the supply system( 3.21 ) at a higher pressure than the nominal distribution pressure( 3.8 ), and is then reduced to the nominal distribution pressure by line pressure regulator(s)( 3.4 )

3.3

flow characteristic

variation of outlet pressure in relation to flow with the inlet pressure remaining constant

3.4

line pressure regulator

pressure regulator( 3.15 ) used in a double stage pipeline distribution system( 3.2 ) to reduce the nominal supply system pressure to the nominal distribution pressure( 3.8 )

3.5

manifold

device for connecting the outlet(s) of one or more cylinders or cylinder bundles of the same medical gas to a medical gas pipeline system( 3.7 )

3.6

manifold pressure regulator

pressure regulator (3.15) intended to be installed within source of supply (3.19) containing cylinders or cylinder bundles, or high pressure storage vessel(s)

3.7

medical gas pipeline system

complete system which comprises a supply system (3.21), a monitoring and alarm system, a pipeline distribution system with terminal units at the points where medical gases or vacuum may be required

3.8

nominal distribution pressure

pressure of gas which the medical gas pipeline system (3.7) is intended to deliver at the terminal units

3.9

nominal inlet pressure

P₁

upstream working pressure (3.24) specified by the manufacturer for which the pressure regulator (3.15) is intended to be used

3.10

nominal outlet pressure

P₂

pressure downstream of the pressure regulator (3.15) under flow conditions specified by the manufacturer

3.11

oxidizing gas

any gas or gas mixture more oxidizing than air, i.e. any gas or gas mixture that is able, at atmospheric pressure, to support the combustion more than a reference oxidizer consisting of 23,5 % oxygen in nitrogen

[SOURCE:ISO 10156:2017, 3.1.5, modified]

3.12

pre-set pressure regulator

pressure regulator (3.15) that is not provided with a means of operator adjustment of the outlet pressure

3.13

pressure characteristic

variation of the outlet pressure in relation to inlet pressure under constant flow conditions

3.14

pressure gauge

device that measures and indicates pressure

3.15

pressure regulator

device that reduces the inlet pressure and maintains the set outlet pressure within specified limits

3.16

pressure-relief device

device intended to relieve excess pressure at a pre-set value

3.17

single fault condition

condition in which a single means for protection against a safety hazard in equipment is defective or a single external abnormal condition is present

3.18

single-stage pipeline distribution system

pipeline distribution system in which gas is distributed from the supply system (3.19) at the nominal distribution pressure (3.8)

3.19

source of supply

portion of the supply system (3.19) with associated control equipment, which supplies the pipeline distribution system

3.20

standard discharge

Q₁

flow for which the pressure regulator (3.15) is designed to maintain a nominal outlet pressure,P₂ (3.10), at test inlet pressure , P₃ (3.22)

3.21

supply system

system that supplies the pipeline distribution system and which includes two or more sources of supply (3.19)

3.22

test inlet pressure

P₃

minimum inlet test pressure

3.23

test outlet pressure

P₅

highest or lowest value of the outlet pressure resulting from a variation in the inlet pressure between P₁ (3.9) and P₃ (3.22) at previously adjusted conditions P₁, P₂ (3.10), Q₁ (3.20)

3.24

working pressure

settled pressure of a compressed gas at a uniform reference temperature of 15 °C in a full gas cylinder

Note 1 to entry: This definition does not apply to liquefied gases (e.g. carbon dioxide) or dissolved gases (e.g. acetylene).