MIL-DTL-24402F(SH)
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with
the applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern.
3.2 Qualification. The filter assemblies and differential pressure indicators furnished under this specification
shall be products that are authorized by the qualifying activity for listing on the applicable qualified products list
3.3 Filter elements. Filter elements for use in the filter assemblies furnished under this specification shall be in
accordance with SAE-J2321 and SAE-J2321/2 for Size B elements or SAE-J2321/3 for Size C elements (see the
applicable specification sheet).
3.4 Materials. Materials and coatings shall conform to the material requirements specified in MIL-STD-2193.
Where threaded connections are used between the filter bowl and housing, the thread design and materials shall be
selected to prevent galling. The bowl and head shall be constructed of dissimilar materials which do not gall when
in contact or of similar materials which have a hardness difference of not less than 45 Brinell points. Threads shall
not be plated or coated to achieve hardness difference.
3.4.1 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered,
environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the
material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous
life cycle costs.
3.4.2 Compatibility. Filter assemblies and differential pressure indicators shall be compatible with the fluids
identified in the compatibility requirements in MIL-STD-2193.
3.5 Construction. Unless otherwise specified (see 6.2), the design, parts, and construction of filter housings
and differential pressure indicators shall conform to the construction requirements specified herein, in
MIL-STD-2193, and in the applicable specification sheet. Plated socket head cap screws shall not be utilized.
3.5.1 Filter assemblies. Filter assemblies (filter element and housing) shall be of the full-flow type, with flow
through the filter element being from outside-in. Filter assemblies shall be constructed so that fluid entering the
filter housing cannot impinge directly upon the filter element medium. Filter assemblies shall prevent installation of
the filter element in a reverse orientation.
The filter assemblies shall permit the removal of the filter element within the element removal clearance
envelope shown on the applicable specification sheet, without disconnecting fittings or disturbing mountings. Filter
assemblies shall meet all requirements with the maximum element diameter permitted for the size element used in
the assembly.
3.5.1.1 Mounting. The equipment shall include provisions for solid mounting of the filter assemblies. The
mounting provisions shall meet the shock requirements of 3.6.1. The mounting shall withstand the wrench loads
required for making tube connections and replacing filter elements.
3.5.1.2 Components. The components comprising the filter assemblies, such as check valves, differential
pressure indicators, and relief valves, shall permit repair or replacement of the components without having to replace
the filter housing or manifold. Internal valves shall have replaceable seats.
3.5.1.3 Interchangeability. In no case shall parts be physically interchangeable or reversible unless such parts
are also interchangeable or reversible with regard to function, performance, and strength.
3.5.2 Filter housings. The filter housings shall meet the flow rates specified in the applicable specification
sheet. These flow rates are based on the use of fluid in accordance with MIL-PRF-17331.
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