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MIL-PRF-24758 Conduit Systems, Flexible, WeatherproofThis specification covers the performance requirements for weatherproof flexible conduit systems \(see 6.3.12\) for use primarily in exposed areas \(see 6.3.10\) on U.S. Navy ships, to shield against electromagnetic \(EM\) radiation from own-ship transmitters and emissions external to the ship, electromagnetic pulse \(EMP\) \(see 6.3.8\) events, and to minimize corrosion \(see 6.3.6\) while being field repairable to reduce maintenance.

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MIL-PRF-24758A(SH)

TABLE II. First article inspection - Continued.

Resistance to flame-

3.7.7

4.7.7

propagation

Acid gas emission

3.7.8

4.7.8

Shock

3.7.9

4.7.9

Weatherproofing

3.8

4.8

External corrosion

3.9

4.9

Corrosion and polluting

3.9.1

4.9.1

materials

Solar radiation

3.9.2

4.9.2

EM signal attenuation

3.10

4.10

Marking

3.11

4.11

Flexible conduit markings

3.11.1

4.11

Conduit fittings markings

3.11.2

4.11

4.3 Conformance inspection. Conformance inspection shall include the examination of 4.4 and the tests

listed in Table III.

Conditions for testing. Testing of the conduit and conduit fittings shall be as specified in IEC 60614-1

4.3.1

and IEC 61035-1 and the following if not specified:

Unless otherwise specified, the tests shall be carried out at an ambient temperature of 68�5 �F

(20�5 �C).

Unless otherwise specified, each test shall be made on three new samples. Certain tests, such as the

checking of dimensions, clearly does not affect a change in the property of the samples, and therefore

these samples shall be considered as new samples and can be used for further tests.

The atmosphere shall have a relative humidity of 45 to 75%.

Environmental tests may be combined when cost effective and approved by the procuring activity.

TABLE III. Conformance inspection.

Test

Requirement Paragraph

Verification Paragraph

Flexible conduit size

3.5.1

4.5.1

Conduit fitting size

3.5.2

4.5.2

Tensile strength

3.7.4

4.7.4

Marking

3.11

4.11

4.4 Examination. Each conduit, end fitting, and adapter shall be examined for compliance with the

requirements specified in 3.6 through 3.11.2. Any redesign or modification of the contractor's standard product to

comply with specified requirements, or any necessary redesign or modification following failure to meet the

specified requirements, shall receive particular attention for adequacy and suitability. This element of inspection

shall encompass all visual examinations and dimensional measurements. Noncompliance with any specified

requirement or presence of one or more defects preventing or lessening maximum efficiency shall constitute cause

for rejection.