MIL-DTL-5513D
4.7.9 Pressure drop (see 3.4.8). Swivels when subjected to pressure drop shall meet the
requirements of 3.4.8. The following details shall apply:
a. The rated flow, as specified in table IV, shall be passed through the swivel joint and the
pressure drop determined by means of manometers, accurately calibrated pressure gages, or
other suitable means (see figure 6).
b. The pressure drop through any swivel joint shall not exceed 10 psig (69 KPa) for each 90-
degree bend in the joint.
Inches
mm
4
101.6
15
381.0
FIGURE 6. Pressure drop test set-up.
4.7.10 Cold temperature operation (see 3.4.9). Swivels when subjected to cold temperature operation
shall meet the requirements of 3.4.9. The following details shall apply:
a. While at room temperature, the swivel joint shall be filled with hydraulic fluid and pressurized to
5 to 10 psig.
b. The swivel joint shall then be cooled to a temperature of -65° to -70°F (-54° to -57°C) and held
at this temperature and pressure for a minimum of 24 hours.
c. At the end of the 24-hour period, torque to obtain swiveling motion shall be determined first at 5
to 10 psig and then at operating pressure.
d. The swiveling torque shall not exceed the values specified in table IV.
e. The joint shall then be swiveled for 25 cycles through the range specified in 4.7.7 at both 5 to
10 psig (35 to 69 KPa) and rated operating pressure.
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