MIL-PRF-52308J
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are classified
as follows:
a. First article inspection (see 4.2).
b. Conformance inspection (see 4.3).
4.2 First article inspection. The contractor shall furnish a minimum of 18 elements to
determine conformance to this specification (see 6.2). First article inspection shall be conducted
as specified in 4.5, Table I. Presence of one or more defects or failure of any examination or test
shall be cause for rejection.
4.3 Conformance inspection.
4.3.1 Lot. Unless otherwise specified (see 6.2), a lot shall consist of not more than 1,000
elements, identically produced by one shift during a single day.
4.3.2 Sampling. Sampling for examinations and tests shall consist of elements randomly
selected from production lots. The number of elements sampled per production lot shall be as
specified in the contract or order (see 6.2).
4.3.3 Inspection. Samples selected in accordance with 4.3.2 shall be examined and tested as
specified in 4.5, Table I. Presence of one or more defects or failure of any test shall be cause for
rejection, and for rejection of the lot represented by the sample.
4.4 Test conditions. The fuel flow rate shall be 20 gal/min (76 L/min) per element, 100 % of
rated flow per element.
4.4.1 Test facility. The test facility shall be in accordance with API 1581, section 4.2.1 Test
Apparatus. Testing shall be conducted by the Government using Government test facilities at a
site selected by the Government. Both single element and full-scale tests shall be conducted
using the military vessel configuration of concentric, vertical elements and separators. The
single element test vessel shall be a uniform standard, single element vessel constructed by the
Government. The full-scale test vessel shall be a military standard 50 GPM filter-separator
vessel, LIN H51915. The full-scale vessel, having four elements, shall be operated at 80 GPM,
or 100% of rated flow per element. Both the single element and full-scale test vessels may be
made available to the contractor upon request, for preliminary qualification testing. The facility
shall contain calibrated and certified measuring equipment.
4.4.2 Test fuel and additives. The category of test fuel used shall be in accordance with the
class of element (see 1.2 and 6.2), and shall be in accordance with API 1581, section 4.2.2 Test
Fuel. The additives used in the test fuel shall be in accordance with API 1581, section 4.2.4.2
Additive Package/Category M100 and M Fuels, for both class M and M100 elements. For class
M100 elements, the additives shall be added to the test fuel in accordance with API 1581, section
4.3.2.3.2 Additive Addition/Category M100 Fuel. For class M elements, the additives shall be
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