MIL-STD-2193C(SH)
c. Return ports. At least 135 percent of the maximum calculated return line pressure considering maximum flow rates and minimum fluid temperatures. If a stop valve is installed in a return line, the requirements for pressure and cylinder ports shall also apply upstream of the stop valve and the proof pressure must be at least equal to that developed with full flow through any relief valve protecting the return line.
5.3.3.4 Burst pressure. The burst pressure shall be as specified in the component specification and shall not be less than 250 percent of the rated operating pressure. Components containing air or gas under pressure shall be subject to a burst pressure of at least 400 percent of the operating pressure. In addition, the minimum burst pressure shall not be less than 150 percent of the proof pressure. The component shall not rupture under this pressure. The pressure may be increased above that specified in order to secure data on actual rupture pressure. If required, this shall be the last test performed because of its destructive nature. Components that require different test pressures in different elements shall have these pressures applied either separately or simultaneously, whichever is the most critical. Components that are subject to pressure in the reverse direction such as check valves, shut-off valves, or accumulators, shall be pressurized in both directions, either separately or simultaneously, whichever is most adverse. The burst pressure test is not required if the specified component is subjected to the fatigue test specified in 5.3.6.
5.3.3.5 Leakage tests.
5.3.3.5.1 External leakage. During the course of all of the tests specified in this standard (with the exception of shock, endurance, and fatigue), external leakage, other than a slight wetting insufficient to form a drop through static seals, shall be cause for rejection. Where external, dynamic seals are utilized, permissible leakage past such seals shall be not greater than that specified in the applicable component specification. During shock and endurance testing, allowable leakage shall not exceed that specified in the component specification.
5.3.3.5.2 Internal leakage. Unless otherwise specified in the component specification, internal leakage tests shall be conducted by applying 0.35 bar (5 lb/in2), 50 percent of rated operating pressure, and operating pressure in the positions identified below:
a. Valves. Leakage tests shall be conducted for all positions in which the valve blocks flow. b. Cylinders, actuators. Leakage tests shall be conducted at the two end positions of travel.
c. Other components. Leakage tests shall be conducted with component held in the position most conducive to leakage.
5.3.3.5.3 Leakage measuring requirements. The leakage measurement shall begin within 2 minutes after the application of pressure and shall be measured for not less than 1 minute and no more than 10 minutes. The rates of leakage shall not exceed those specified in the component specification. Conformance (acceptance) tests for external leakage shall be conducted at rated operating pressures.
5.3.4 Extreme temperature functioning. When this test is specified in the applicable component specification, it shall be conducted as follows:
5.3.4.1 Low temperature. The component shall be connected to the rated operating pressure specified in the applicable component specification. Unless otherwise specified in the applicable component specification, this arrangement shall be maintained at a temperature not warmer than -28.8 °C (-20 °F) for 3 hours after the
temperature has stabilized at -28.8 °C (-20 °F). After this period, the component shall be actuated at least two times. Variation of actuating forces or regulation, as applicable, shall not exceed that specified in the component specification. The leakage tests in 5.3.3.5.1 and 5.3.3.5.2 shall be performed after each actuation to determine conformance to the requirements of the applicable component specification. Use of low viscosity fluids will be permitted during this test.
5.3.4.2 Intermediate temperature. Unless otherwise specified in the applicable component specification, immediately following the low temperature test (see 5.3.4.1), the test arrangement shall be warmed rapidly to 80 °C (176 °F). While the temperature is being raised, the component shall be actuated at maximum increments of 15 °C (59 °F) to determine satisfactory operation throughout the temperature range. These tests shall be performed without waiting for the temperature of the entire component to stabilize.
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