MIL-DTL-13531J
TABLE VI. Individual inspections.
Requirement
Inspection
Inspections
paragraph
paragraph
Visual inspection 1/
Hose assemblies (fittings) 1/
Proof pressure 2/
1/ 100 percent inspection unless an alternate sampling plan is
approved in writing by the qualifying activity.
2/ 100 percent inspection of bulk hose length and each hose
assembly.
4.6.2 Individual inspections sampling plan. Individual inspection tests specified in table VI shall be
performed on a production lot basis. All defective material shall be removed from the production lot and
shall not be supplied to this specification.
4.6.3 Sampling inspection. Sampling inspections shall consist of the inspections specified in table
VII and shall be made on test samples from production lots which have been subjected to and passed
the individual inspections (see table VI).
4.6.3.1 Sampling for bulk hose. Sampling for bulk hose shall be performed on each continuous run
under essentially continuous conditions. Samples shall be selected at a rate of 1 sample for each full or
partial increment of 750 feet (228.60 m) of hose produced in the continuous run, up to a maximum of 2
samples (for continuous runs greater than 1,500 feet (457.20 m)), 2 samples shall be selected, but they
shall be representative of the entire production run). Sampling tests for length change and burst shall be
performed in the listed order on each sample as applicable.
4.6.3.2 Hose assemblies. For hose assemblies, the inspection lot shall be 8 samples tested for each
3000 assemblies produced (large lot option). At the option of the manufacturer, one sample may be
tested for each 375 assemblies produced (small lot option). If there has been some production, but the
number hose assemblies produced has not reached 375 for a specific size within three years, the
manufacture shall perform sampling tests on one hose assembly of that size unless documented
approval to not perform the tests has been obtained from the qualifying activity.
TABLE VII. Sampling inspections.
Requirement
Inspection
Sampling
Inspections
paragraph
paragraph
Length change1/
X
Burst pressure
X
1/ Length change is for bulk hose only.
4.6.4 Acceptance of conformance inspection data. Required conformance tests at the hose assembly
level that were already performed at the bulk hose level may be eliminated if documented approval has
been obtained from the qualifying activity.
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