For pressure vessels fabricated from metallic materials and connected to a line source of pressure, what are the proof and ultimate load requirements according to CS-25 Appendix L?

The proof load is 3.0 PL or 1.5 PL, and the ultimate load is 4.0 PL or 2.0 PL. The lower values are conditional upon justification by a fatigue endurance test.

What is the strength value for rigid pipes and ducts under proof conditions according to CS-25 Appendix L?

The strength value for rigid pipes and ducts under proof conditions is 1.5 PW.

What is the strength value for flexible hoses under proof conditions according to CS-25 Appendix L?

The strength value for flexible hoses under proof conditions is 2.0 PW.

Appendix L

Q: According to CS-25 Appendix L, what are the minimum acceptable conditions for storage, handling, and inspection of all pressure vessels?

The minimum acceptable conditions for storage, handling, and inspection are to be defined in the appropriate manual. See CS 25.1529.

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Appendix L

ED Decision 2005/006/R

Element of System	Strength Value	Remarks
Rigid pipes and ducts Couplings Flexible hoses Return line elements	1·5 P_W 1·5 P_W 2·0 P_W –	3·0 P_W 3·0 P_W 4·0 P_W 1·5 P_f	P_f The maximum pressure applied during failure conditions.
Components other than pipes, couplings, ducts or pressure vessels	1·5 P_W	2·0 P_W
Pressure vessels fabricated from metallic materials. (For non-metallic materials see CS 25.1436(b)(7)) Pressure vessels connected to a line source of pressure Pressure vessels not connected to a line source of pressure, e.g. emergency vessels inflated from a ground source	3·0 P_L or 1·5 P_L	4·0 P_L or 2·0 P_L	The lower values are conditional upon justification by a fatigue endurance test from which a permissible fatigue life is declared, and upon the ultimate load test being made on the test specimen used for the fatigue life test. The lower values are conditional upon justification by a life endurance test of a suitably factored permissible number of inflation/deflation cycles, including temperature fluctuation results in a significant pressure variation, and upon the ultimate load test being made on the test specimen used for the life endurance test. For all pressure vessels: (1) The minimum acceptable conditions for storage, handling and inspection are to be defined in the appropriate manual. See CS 25.1529. (2) The proof factor is to be sustained for at least three minutes. (3) The ultimate factor is to be sustained for at least one minute. The factor having been achieved, the pressure vessel may be isolated from the pressure source for the remaining portion of the test period.
2·5 P_L or 1·5 P_L	3·0 P_Lor 2·0 P_L

Element of System

Strength Value

Remarks

Proof

Ultimate

Rigid pipes and ducts

Couplings

Flexible hoses

Return line elements

1·5 P_W

2·0 P_W

–

3·0 P_W

4·0 P_W

1·5 P_f

P_f The maximum pressure applied during failure conditions.

Components other than pipes, couplings, ducts or pressure vessels

1·5 P_W

2·0 P_W

Pressure vessels fabricated from metallic materials.

(For non-metallic materials see CS 25.1436(b)(7))

Pressure vessels connected to a line source of pressure

Pressure vessels not connected to a line source of pressure, e.g.

emergency vessels inflated from a ground source

3·0 P_L or

1·5 P_L

4·0 P_L or

2·0 P_L

The lower values are conditional upon justification by a fatigue endurance test from which a permissible fatigue life is declared, and upon the ultimate load test being made on the test specimen used for the fatigue life test.

The lower values are conditional upon justification by a life endurance test of a suitably factored permissible number of inflation/deflation cycles, including temperature fluctuation results in a significant pressure variation, and upon the ultimate load test being made on the test specimen used for the life endurance test.

For all pressure vessels:

(1) The minimum acceptable conditions for storage, handling and inspection are to be defined in the appropriate manual. See CS 25.1529.

(2) The proof factor is to be sustained for at least three minutes.

(3) The ultimate factor is to be sustained for at least one minute. The factor having been achieved, the pressure vessel may be isolated from the pressure source for the remaining portion of the test period.

2·5 P_L or

1·5 P_L

3·0 P_Lor

2·0 P_L

[Amdt 25/1]

Details

Source-Title: Appendix L View latest amendments

Erulesid: ERULES-1963177438-9406 Compare versions

Domain: Initial airworthiness

Amendedby: Amendment 1

Applicabilitydate: 12 December, 2005

Entryintoforcedate: 12 December, 2005

Regulatorysource: ED Decision 2005/006/R Navigate

Regulatorysubject: CS-25

Typeofcontent: CS (Certification specification)

Origin: EASA

Category: EAR