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Division 3.11 Modifications

Original text. Later amendments are not shown.

Modifications may be approved in accordance with the reduced test programme specified in Table IV.3.11. Any major changes that are not covered by Table IV.3.11. shall be subjected to full approval testing.

Table IV.3.11.

Approval testing of modifications

Only when thickness change is proportional to diameter or pressure change.

A hydrogen cycle test is not required if the stresses in the neck are equal to the original or reduced by the design change (e.g. Reducing the diameter of internal threads, or changing the boss length), the liner to boss interface is not affected, and the original materials are used for boss, liner, and seals.

Any deviation from the parameters in the appendix to the information document as set out in Part 1 to Annex II is considered to be a change in manufacturing process.

Explanatory notes: for example: ‘2, 3’ indicates that a test is required for type 2 and 3 containers only.

Type of test
Materials sections 4.1.1.-4.1.8., as applicableHydrogen compatibility section 4.1.7.Burst section 4.2.1.Ambient temp. pressure cycling section 4.2.2.Lbb Performance section 4.2.3.Bonfire section 4.2.4.Penetration section 4.2.5.Chemical exposure section 4.2.6.Composite flaw tolerance section 4.2.7.Acc. Stress rupture – section 4.2.8.Impact damage test section 4.2.10.Permeation (section 4.2.12.) Boss torque (section 4.2.13.) Hydrogen cycling (section 4.2.14.)
Fibre manufacturer2, 3, 42, 3, 42, 3, 42, 3, 43, 4
Metallic container or liner material1, 2, 31, 2, 31, 2, 31, 2, 31, 21, 2, 31, 2, 31, 2, 32, 32, 33
Plastic liner material4444
Fibre material2, 3, 42, 3, 42, 3, 42, 3, 42, 3, 42, 3, 42, 3, 42, 3, 42, 3, 43, 4
Resin material2, 3, 42, 3, 42, 3, 42, 3, 43, 4
Diameter change ≤ 20 %1, 2, 3, 41, 2, 3, 4
Diameter change >20 %1, 2, 3, 41, 2, 3, 41, 2, 3, 41, 2, 3, 42, 3, 43, 4
Length change ≤ 50 %1, 2, 3, 4—
Length change > 50 %1, 2, 3, 41, 2, 3, 41, 2, 3, 43, 4
Nominal working pressure change ≤ 20 %f1 1, 2, 3, 41, 2, 3, 4
Nominal working pressure change > 20 % 1, 2, 3, 41, 2, 3, 41, 2, 3, 41, 2, 3, 41, 2, 3, 4
Dome shape1, 2, 3, 41, 2, 3, 44
Opening size1, 2, 3, 41, 2, 3, 4
Coating change2, 3, 42, 3, 4
End boss design4f2
Change in manufacturing processf3 1, 2, 3, 41, 2, 3, 4
Fire protection system1, 2, 3, 4

Annotations

Footnotes

f1

Only when thickness change is proportional to diameter or pressure change.

f2

A hydrogen cycle test is not required if the stresses in the neck are equal to the original or reduced by the design change (e.g. Reducing the diameter of internal threads, or changing the boss length), the liner to boss interface is not affected, and the original materials are used for boss, liner, and seals.

f3

Any deviation from the parameters in the appendix to the information document as set out in Part 1 to Annex II is considered to be a change in manufacturing process.