ISO 16111:2018 可搬型ガス貯蔵装置—可逆性金属水素化物に吸収された水素 | ページ 6

3.1

absorbed , adj.

taken and held through the formation of chemical bonds within the bulk of the material

3.2

burst pressure

highest pressure reached in an MH assembly during a burst test

3.3

design stress limit

total stress loading allowed on the shell wall

Note 1 to entry: In MH assemblies, the shell design takes into account the gas pressure plus other stresses, such as pressure exerted by expansion of the hydrogen absorbing alloy.

3.4

fuel cartridge

MH assembly, which stores hydrogen for use as a fuel in a fuel cell through a valve(s) that controls the discharge of fuel into the fuel cell

3.5

full flow capacity pressure

gas pressure at which the pressure relief device is fully open to have the maximum gas flow

3.6

hydrogen absorbing alloy

material capable of reacting with hydrogen gas to form a reversible metal hydride

3.7

internal component

structure, matrix, material or device contained within the shell (excluding hydrogen gas, hydrogen absorbing alloy and metal hydride)

Note 1 to entry: Internal components may be used for purposes such as heat transfer, preventing movement of the hydrogen absorbing alloy/metal hydride and/or to prevent excessive stress on the shell walls due to hydride expansion.

3.8

internal volume

water capacity of the shell

3.9

maximum developed pressure

MDP

highest gas gauge pressure developed internally to an MH assembly at rated capacity and equilibrium under normal service conditions or normal operating conditions, whichever is greater

Note 1 to entry: The MDP term was specifically selected for MH assemblies to avoid confusion with the maximum allowable working pressure (MAWP) and the service pressure used in other ISO International Standards.

3.10

metal hydride

solid material formed by reaction between hydrogen and hydrogen absorbing alloy

3.11

metal hydride assembly

MH assembly

single complete hydrogen storage system, including shell, metal hydride, pressure relief device (PRD), shut‑off valve, other appurtenances and internal components

Note 1 to entry: The MH assembly extends only to, and including, the first shut-off valve.

Note 2 to entry: A fuel cell cartridge is a type of MH assembly.

3.12

normal operating conditions

range of pressures, MH assembly external shell temperatures, hydrogen flow rates, hydrogen quality, etc., specified for all use and filling operations

3.13

normal service conditions

range of pressures and environmental temperatures, specified for transportation and storage conditions

3.14

pressure relief device

PRD

device intended to prevent the rupture of an MH assembly in the event of overpressure or exposure to fire

Note 1 to entry: A pressure relief device may be “pressure-activated”, set to activate at a certain pressure. Alternatively, a pressure relief device may be “thermally-activated”, set to activate at a certain temperature. A pressure relief device may also be both “pressure-activated” and “thermally-activated”.

3.15

pressure relief valve

PRV

reseatable pressure relief device (PRD)

3.16

rated capacity

maximum quantity of hydrogen deliverable under specified conditions

3.17

rated charging pressure

RCP

maximum pressure to be applied to the MH assembly for refilling

Note 1 to entry: The RCP is not necessarily equal to the equilibrium plateau pressure of the hydrogen absorbing alloy.

3.18

reversible metal hydride

metal hydride for which there exists an equilibrium condition where the hydrogen absorbing alloy, hydrogen gas and the metal hydride co-exist

Note 1 to entry: Changes in pressure or temperature will shift the equilibrium favouring the formation or decomposition of the metal hydride with respect to the hydrogen absorbing alloy and hydrogen gas.

3.19

rupture

structural failure of a shell resulting in the sudden release of stored energy

3.20

shell

enclosure of any shape (cylindrical, prismatic, cubic, etc.) designed to contain the hydrogen gas, metal hydride and other internal components of the MH assembly

Note 1 to entry: A shell may be a gas cylinder, a pressure vessel or other type of container.

3.21

stress level at MDP

sum of all the stresses on the shell wall caused by the metal hydride at rated capacity, hydrogen gas at MDP and any other applicable mechanical loadings

3.22

test pressure

required pressure applied during a pressure test for qualification