MIL-DTL-29210E
and the temperature at 369F min - 406F max (187C min - 208C max). In addition, "V" steam
strainer shall be installed at end of test manifold to trap rubber particles that may separate from
the hose tube. Clamp separate from the hose tube. Clamp test hose horizontally between two
steam manifolds and subject it to steam at 200 psig (1.4 MPa (gauge)), 388F (198C) for
periods of 23.5 hours, until a total time of 1,500 hours has elapsed.
c. At the end of each steaming period (not more than 23.5 hours), the pressure shall be released in
order that pressure be returned to atmospheric conditions within a time of 1 minute or less. Care
shall be taken to ensure that condensation will not be drained from the hose. The hose shall
remain at atmospheric conditions for not less than 30 minutes, after which the steam pressure
shall again be raised to 200 psig (1.4 MPa (gauge)) and held another 23.5 hours during the
steaming period. The above cycle shall be repeated until the hose has been subjected to 1,500
hours of steam pressure.
d. Upon completion of 1,500 hours of steaming, the hose shall be removed from the test apparatus
and the outer and inner tube surfaces shall be examined (see 4.7.2.4 (a)) for signs of damage.
Except for indentation resulting from clamping, any flaking, peeling, blistering, cracking, or
popcorning of the cover or tube shall be cause for rejection.
e. If the hose passes the above visual examination, the hose shall be cooled to 70F 5F (21C
3C). The hose shall then be bent in a 180-degree arc around a 20-inch (508 mm) mandrel. The
outer cover of the hose shall have no visual signs of cracking.
f. The length of hose shall be subjected to the burst test specified in 4.7.2.5.
4.7.2.5 Burst resistance (see 3.5.2). The hose sample shall be subjected to the hydrostatic straight
bursting test as specified in ASTM D380. Water shall be used as the test media. Any suitable coupling
other than those specified in 3.4.3 may be used for this test. Failure of the hose at a pressure below the
2500 psig (17 MPa (gauge)) burst pressure specified in 3.5.2 shall be cause for rejection.
4.7.3 Metal liner tests (see 3.2.1 and 3.4.2). The metal liner shall be subjected to the tests specified
4.7.3.1 Inside diameter (see 3.4). The inside diameter of the metal liner shall be measured in
accordance with ASTM D380 and meet the requirements of 3.4.
4.7.3.2 Thickness (see 3.4). The thickness of the metal liner shall be measured in accordance with
ASTM D380 and meet the requirements of 3.4.
4.7.3.3 Chemical composition (see 3.4.2). The chemical composition of the metal liner shall be
determined in accordance with ASTM A751. Failure to comply with the applicable composition specified
in 3.4.2 shall be cause for rejection of the lot.
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