MIL-DTL-24402F(SH)
3.7.1.1 Selector valve positions. On duplex filter assemblies, the three positions of the selector valve shall be
clearly marked to indicate the filtration circuit selected.
3.7.1.2 Ports. Inlet and outlet ports shall be clearly and permanently marked "IN" and "OUT," respectively.
Drain and vent ports shall be clearly and permanently marked "DRAIN" and "VENT," respectively.
3.7.1.3 Filter bowls. The threaded filter bowls shall be clearly and permanently marked "Hand Tighten Only."
3.7.1.4 Aluminum components. Pressure-containing aluminum components of the filter assemblies shall be
permanently marked with the alloy and temper of the aluminum. Military standard hardware and aluminum parts
internal to the filter assembly are exempt from this marking requirement.
3.7.2 Differential pressure indicator. Each differential pressure indicator shall be clearly and permanently
identified by an attached identification plate containing the following information:
a.
Differential pressure indicator specification PIN (see the applicable specification sheet).
Manufacturer s part or drawing number.
b.
Manufacturer s name or trademark.
c.
3.7.3 Special marking. Each assembly shall incorporate appropriate caution or warning plates as necessary, to
assure lubrication and assembly procedures that will prevent galling of threads during element replacement.
3.8 Workmanship. Dimensions and tolerances shall be as specified herein and on the applicable specification
sheet. Unless otherwise specified (see 6.2), filter housings shall be free from visual cracks, machined surface
anomalies, alloy inclusions, discontinuities, and asperities.
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:
a.
Qualification inspection (see 4.2).
b.
Conformance inspection (see 4.3).
4.2 Qualification inspection. Qualification inspection shall be conducted at a laboratory acceptable to the
Naval Sea Systems Command (NAVSEA). Qualification inspection shall consist of the examination and tests
specified in table I. Tests shall be performed in the sequence shown in table I. Failure of any test shall be cause for
rejection.
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