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MIL-PRF-24755 Fans, Vaneaxial, High Pressure, Naval ShipboardThis specification covers high pressure vaneaxial fans used in collective protective systems for Naval shipboard ventilation systems.

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MIL-PRF-24755B(SH)

TABLE IV. Test agenda.

Applicability of Test to Fan Type

Tests

Requirements

Verification

First Article

Conformance

Periodic

Performance

3.19

4.7.1

All

Aerodynamic stall

3.19.2

4.7.2

All

Airborne noise

4.7.3

First production

By measurement

3.19.3

4.7.3.1

unit

By ear

3.19.3

4.7.3.5

All

All 1/

Casing sound

3.19.3

4.7.3.4

power

Balance

3.10.2

4.7.4

All

First production

Vibration

3.10.2

4.7.4.1

unit

All 1/

Casing tightness

Speed

All

Type A, first

Shock

3.10.1

4.7.7

production unit

First production

Motor heat

3.18.1

4.7.8

unit

First production

Bearing temperature

3.18.1

4.7.9

unit

All 1/

Nonmagnetic

3.2.4

4.9

First production

Maintainability

3.9

4.10

unit

NOTE:

Test is required only when specified (see 6.2).

4.6 Material and dimensional examination.

4.6.1 Cast impeller and casing. Test samples shall be inspected for chemical content and mechanical properties

in accordance with ASTM B26/B26M. Cast impellers can use materials not specified by ASTM B26/B26M if

approved by NAVSEA. Repairs of cast impeller are not permitted. Cast casings may be repaired by welding or

impregnation if completed in accordance with NAVSEA Technical Publication S9074-AR-GIB-010/278.

4.6.2 Fabricated steel casing. Steel casings shall be visually examined for defects. Cracks in the radius of spun

flanges or in the welds of welded flanges may be repaired by welding, after proper preparation, provided that

radiographic inspection of the repaired areas is performed. Wall thickness shall be measured on at least 10 percent

of the casings.

4.6.3 Machined impeller. Machined aluminum impellers shall use 6061-T6 Grade in accordance with ASTM

B221, or an alternate material if approved by NAVSEA.

4.7 Tests. Tests shall be as specified in 4.7.1 through 4.7.10 (see Appendix B).

4.7.1 Performance. Performance tests shall be conducted in accordance with ANSI/AMCA 210. Any of the

test stands that utilize nozzles as a flow measuring device and associated instrumentation may be used.