MIL-DTL-5513D
4.7.2 Fluid immersion (see 3.4.1). All swivel joints containing nonmetallic seals or other nonmetallic
parts, other than AN or MS static seals with standard glands, when subjected to fluid immersion shall
meet the requirements of 3.4.1. The following details shall apply:
a. Swivels shall be immersed in the appropriate hydraulic fluid at the applicable temperature
required by table VIII for a period of 72 hours before being subjected to the first article
inspection.
b. There shall be no leakage, sticking, binding, or other malfunctioning of the joint after this
immersion.
TABLE VIII. Elevated temperature test requirements.
Swivel joint
Test temperature
type
I
158° to 162°F (70° to 72°C)
II
270° to 280°F (132° to 138°C)
III
440° to 460°F (227° to 238°C)
IV
270° to 280°F (132° to 138°C)
4.7.3 Proof pressure (see 3.4.2). Each swivel joint shall be subjected to the proof pressures as
a. For first article inspection test items (see 4.5), the test shall be conducted with the fluid at the
maximum rated temperature (table VIII).
b. The testing of conformance inspection items shall be conducted with fluid at room temperature.
c. The pressure shall be applied for not less than two minutes.
d. During this time, the joint shall be swiveled to four approximately equidistant positions through
its swiveling circle and the pressure shall be held for a minimum of 30 seconds at each position.
e. There shall be no evidence of leakage or other malfunctioning during this test.
4.7.4 Leakage at low pressure (see 3.4.3). Swivel joints shall be subjected to the leakage at low
pressures and shall meet the requirements of 3.4.3. The following details shall apply:
a. For first article inspection items, the test specified for proof pressure and leakage (see 4.7.3)
shall be used except that the pressure applied at maximum rated fluid temperature, for the two
minute period shall be 5 to 10 psi (34.5 to 69 KPa).
b. The tests for conformance inspection items shall also use the proof pressure and leakage test
(see 4.7.3) at room temperature, except air-under water shall be used in place of hydraulic fluid
and the pressure for the two minute period shall be 5 to 10 psi (35 to 69 KPa).
4.7.5 Reverse leakage (see 3.4.4). Swivel joints shall be subjected to reverse leakage and shall meet
the requirements of 3.4.4. The following details shall apply:
a. After plugging one of the ports of the swivel joint, a vacuum equivalent to 25 inches Hg (12.3
psi (86 KPa)) pressure differential shall be applied at the other port and held for a period of five
minutes.
b. During this five minute period, the plane joint shall be operated through 25 cycles with each half
cycle consisting of not less than 120° of rotation.
c. Variable axis swivels shall be rotated through a minimum 90 percent of their rated swivel
excursion through each half cycle.
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