MIL-DTL-27536C
4.6.5 Vibration. The coupling shall be assembled as specified in 4.4.3
and the nut tightened to rated torque. Perform the vibration test in
accordance with MIL-STD-810 method number 514.3, category 5. The high and low
temperature portions of the tests shall be accomplished at the applicable high
and low temperature values specified in table III. The vibration spectrum is
to be extended to 2000 cycles per second at constant 10G acceleration. Omit
the cycling test.
TABLE III.
Temperature for vibration test.
Rated temperature range
Low temperature
High temperature
-65° to 800°F
800°F
"1/"
-450° to 250°F
-320°F
"1/"
-320° to 1200°F
-320°F
1200°F
1/ Where no low or high temperature tests are required the time of testing at
room temperature shall be extended an equivalent amount of time.
4.6.5.1 Leakage test (type L - redundant safety latch only). In a
pneumatic system tubing joint pressurized to 120 psi, with the manufacturer's
recommended seal and with the T-bolt torqued within the specified limits, no
leakage shall be allowed. With the V-band coupling restrained only by the
secondary safety latch, the air leakage test shall not exceed 0.25 pound per
minute per inch of tube size at any pressure up to 120 psi. This test shall
be performed with the joint pressurized and primary latch failure simulated by
cutting the normally torqued T-bolt or pulling a socket wrench off a split nut
to test for engagement of the secondary latch and retention of the flanges.
No deformation or malfunction of the secondary latch shall occur.
4.6.6 Life test. The coupling shall be assembled at rated torque over
test flanges rigidly attached to suitable extensions. Apply 80 percent of
rated bending load in alternate directions for a total of 100000 cycles. Rate
of cycling shall be 60-120 cycles per minute. Check torque. At the
conclusion of this test disassemble and examine coupling. Any evidence of
failure shall be cause for rejection. The assembly shall be rotated 90
degrees in the test fixture each 25000 cycles without loosening or tightening
the joint.
4.6.7 Ultimate load test. The couplings shall be assembled as specified
in 4.6.2. Apply 150 percent rated torque. Hold at this torque for 48 hours,
and, while at this torque, apply 150 percent rated load. Any evidence of
separation or rupture shall be cause for rejection.
5.
PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall
be as specified in the contract order (see 6.2). When actual packaging of
materiel is to be performed by DoD personnel, these personnel need to contact
the responsible packaging activity to ascertain requisite packaging
requirements. Packaging requirements are maintained by the Inventory Control
Point's packaging activity within the Military Department or Defense Agency,
or within the Military Department's System Command. packaging data retrieval
is available from the managing Military Department's or Defense Agency's
automated packaging files, CD-ROM products, or by contacting the responsible
packaging activity.
6.
NOTES
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