ISO 19078:2013 ガスボンベ—ボンベの設置の検査、および自動車の燃料としての天然ガスの船内貯蔵用の高圧ボンベの再認定 | ページ 6

3.1

abrasion

damage to an area of the cylinder or its installation equipment caused by scraping, wearing, vibration or rubbing away of the material by friction

Note 1 to entry: Abrasion can be the result of many cycles of something rubbing lightly on the surface of the cylinder or its installation equipment, or due to a few cycles, perhaps only one, of heavy rubbing.

3.2

impact

blow to the surface of the cylinder that can significantly damage and/or indent the surface (e.g. cutting, gouging)

Note 1 to entry: Impact can also induce such damage as delaminations, which are not readily apparent through visual examination.

3.3

component

parts that are used directly in conjunction with the installation of the fuel container to include the cylinder, valve, pressure relief device (PRD), vent and mounting

3.4

condemned

cylinder or piece of its installation equipment no longer fit for service and for which repair is not allowed

3.5

crazing

hairline cracking of the resin, giving it an opaque, frosty appearance

3.6

cut

damage caused by a sharp object coming into contact with the cylinder's surface

3.7

delamination

form of composite damage, in which a separation develops between layers of the composite

3.8

destroyed

cylinder or piece of its installation equipment in a state that makes it physically unusable for its purpose

3.9

dome

curved end portion of the cylinder

3.10

external coating

surface treatment applied to the cylinder for environmental protection and/or improved appearance

3.11

gas tight housing

enclosure fitted at any potential leakage points (e.g. cylinder/valve connection or PRD) to collect and vent any leaked gas to outside the vehicle

3.12

helical

winding in the longitudinal and circumferential direction on both the cylindrical and dome regions of the cylinder

Note 1 to entry: The strands of reinforcing fibres are oriented at an angle to the longitudinal axis of the cylinder.

3.13

hoop direction

hoop pattern

winding along the cylindrical portion of the cylinder

Note 1 to entry: The strands of reinforcing fibres are oriented at an angle of nearly 90 degrees to the longitudinal axis of the cylinder.

3.14

inspection body

organization that performs the visual inspection of compressed natural gas (CNG) cylinders used in natural gas vehicles (NGVs)

3.15

inspector

individual who is authorized by an inspection body to perform the visual inspection

3.16

inspection mark

stamp, label or tag placed by an inspector on the cylinder indicating acceptance of the cylinder

3.17

Level 1 damage/condition

minor damage that can occur during normal use

Note 1 to entry: Such damage normally has no adverse effects on the safety of the cylinder and its continued use. Scratched paint or nicks that have no appreciable depth in metal, or similar damage in the composite cylinder paint or resin where there are no visible frayed fibres, are considered to be of this level of damage.

Note 2 to entry: See Table 1.

3.18

Level 2 damage/condition

damage that is more severe than Level 1, but where after repair the cylinder is authorized to return to service, or based upon the recommendations of the manufacturer may be classified as Level 1 or Level 3

Note 1 to entry: See 7.4.3 and Table 1.

3.19

Level 3 damage/condition

damage that requires a cylinder be condemned

Note 1 to entry: A Level 3 condition is such that the cylinder must be rendered unfit for continued service and cannot be repaired.

Note 2 to entry: See Table 1.

3.20

liner

internal container of the cylinder, which sometimes carries pressure, that prevents leakage of gas through the composite cylinder structure

3.21

manufacturer

cylinder maker, unless otherwise stated

3.22

marking

information permanently applied to an item (e.g. stamping and permanent labelling)

3.23

mounting brackets and/or straps

devices used to secure cylinders in a vehicle

3.24

overpressurization

pressurization of the cylinder, which at 15 °C results in a settled pressure that is higher than the working pressure marked on the cylinder, or pressurization of a cylinder to a pressure that is above 26 MPa independent of temperature conditions (for a 20 MPa working pressure cylinder)

3.25

pressure relief device

PRD

device that releases the contained gas in specific emergency conditions in accordance with ISO 15500-13

3.26

reinforcing fibres

continuous fibrous strands in the composite, such as carbon, aramid, glass or combinations thereof, which withstand loads caused by pressurization

3.27

rejected cylinder or installation equipment

cylinder or its installation equipment that needs to be removed from service, i.e. disassembled from the vehicle

Note 1 to entry: For Level 2 damage, the cylinder is evaluated further before repairing or condemning. For Level 3 damage, the cylinder or equipment is subsequently condemned.

3.28

repair

action, including rework, to return a cylinder to an acceptable Level 1 condition

3.29

resin

material that is used to bind and hold the fibres in place

3.30

working pressure

settled pressure, at a uniform temperature of 15 °C

3.31

stress corrosion cracking

SCC

phenomenon resulting in a split or rift in the materials, caused by a combination of load and aggressive environment

Note 1 to entry: Such cracks in composite materials are typically sharply defined and can appear as a family of cracks or as a single crack.

3.32

valve

device installed in one of the threaded openings of the cylinder used to allow gas flow into or from the cylinder

Note 1 to entry: A manual valve is turned on or off with a handle. A solenoid valve is turned on or off automatically. Some solenoid valves can be operated manually with special tools.

3.33

vent line

high-pressure line used to conduct gas from a PRD to a location outside the vehicle, where gas can be discharged safely