MIL-DTL-27267 Hose, Cres Wire Reinforced, Polytetrafluoroethylene, 450 Degrees F, Medium PressureThis specification covers the requirements for a hose, CRES reinforced, polytetrafluoroethylene, 450┬░F, medium pressure \(see 3.5.1\).

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MIL-DTL-27267D

4.5 Conformance inspection.

4.5.1 Individual tests. Inspection of the product for delivery shall consist of subjecting each hose

length to the individual tests specified in table IX. Any item failing to meet the requirements of the

individual tests shall be immediately removed from the lot.

TABLE IX. Individual inspection.

Requirement

Test method

Requirement

paragraph

Paragraph

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Examination of product

Proof pressure

4.5.2 Sampling tests. The following inspections and tests shall be performed in the order indicated

on two samples, one consisting of eight hose assemblies with straight fittings at each end and the

second consisting of 4 lengths of hose, selected at random from each inspection lot. The inspection lot

shall consist of approximately, but not more than, 3000 hose assemblies, all of one size manufactured

under essentially the same conditions, but not necessarily during one continuous run. One hose

assembly tested from each lot of 375 hose assemblies is also permitted. The first sample (8 hose

assemblies) shall be subjected to tests in the following sequence.

a. Internal cleanliness (see 3.5.3.17 and 4.6.3.17).

b. Leakage tests (see 3.5.3.11 and 4.6.3.11).

c. Room temperature burst pressure test (see 3.5.3.6 and 4.6.3.6).

The second sample (4 hose lengths) shall be subjected to tests in the following sequence:

d. Braid flare-Type B only (see 3.5.3.1 and 4.6.3.1)

e. Specific gravity tests (apparent and relative) (see 3.5.2.4 and 4.6.2.3)

NOTE: Production lot records may be used to verify conformance to specific gravity tests if the

PTFE tube being used is an established production item.

4.5.2.1 Nonconformance of sampling tests. If one or more defects are found in the inspection

sample, both the qualifying and inspection activities shall be immediately notified and the production lot

shall be rejected and not be supplied to this specification. Acceptance and shipment of the product shall

be discontinued until corrective action, acceptable to the qualifying activity, has been taken. The

corrective measures shall be performed on the materials or processes, or both, as warranted, and on all

products considered subjected to the same failure. Once the corrective action has been completed,

either the specific sampling test in which the original sample failed or all sampling tests may be required

to be repeated on additional samples, at the option of the qualifying activity. However, final acceptance

shall be withheld until testing has shown that the corrective action was successful. In the event of a

failure after re-inspection, information concerning the failure and the corrective action taken shall be

furnished to both the qualifying and inspection activities.

4.5.3 Periodic Control Tests. The following inspections and tests shall be performed as indicated on

eight hose assemblies manufactured from bulk hose lengths selected at random from each inspection lot.

The inspection lot shall consist of not more than 20,000 feet of hose, all of one size, manufactured under

essentially the same conditions but not necessarily during one continuous run. Two hose assemblies

manufactured and tested from each lot of 5000 feet of hose is also permitted.