MIL-DTL-27536C
4.5
Examinations.
4.5.1 Examination of product. The coupling shall be examined to determine
conformance with the requirements of this specification and the applicable
detail specification sheet with respect to material, workmanship, dimensions,
finish, and identification marking.
4.6
Test methods.
4.6.1 Assembly and torque deformation. The coupling shall be installed on
a mandrel and the nut tightened to rated torque. Any interference, binding,
galling, misalignment, or excessive deformation shall be cause for rejection.
4.6.2 Proof load. A test setup shall be arranged using test flanges
suitably instrumented and connected to hydraulic cylinders so as to measure
and apply axial load and deflection. Flanges shall be preset at a uniform
axial gap of 0.060-0.070 inch. The coupling shall then be installed and
tightened to pull the flanges together and reduce the axial gap. The
hydraulic cylinder pressure may be regulated prior to the final two turns of
the coupling latching device in order that the final two turns will bring the
coupling to rated torque at a flange gap of 0.001 to 0.010 inch. The axial
load shall then be recorded and this load shall be a minimum of 25 percent of
the rated axial load specified in the applicable MS standard. The hydraulic
cylinder pressure shall then be increased to apply rated axial load to the
coupling. The increase in flange gap shall be recorded. The load shall be
reduced to zero and the coupling removed and examined for signs of failure
(see 6.3.1).
4.6.3 Temperature shock test. The coupling shall be assembled over the
test flanges or mandrels of 4.4.2, and tightened to rated torque. The
assembly shall be subjected to the temperature shock test of MIL-STD-810,
Method 503.3, except that the initial and final temperatures shall be in
accordance with table II herein. At the conclusion of the third cycle, the
assembly shall be returned to room temperature, followed by visual examination
and check of nut torque. Minimum final torque shall be 25 percent of rated
torque.
TABLE II.
Temperature for shock test.
Coupling rated
Initial
Final
temperature range
temperature
temperature
-65° to +800°F
-65°F
800°
-320° to +1200°F
-320°F
1200°F
-450° to +250°F
250°F
-320°F
4.6.4 Salt spray. Salt spray tests shall be in accordance with salt spray
test of MIL-STD-810, method number 509.2 except equipment need not be
operated.
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