MIL-DTL-5886H
4.5.1.1 Dimensions. The cylinder shall be checked dimensionally to determine
conformance to Table IV and Figure 2.
4.5.2 Cleanliness. Cleaning shall be accomplished in accordance with SAE-ARP1176
(see 3.4.1).
4.5.3 Leakage. The cylinder shall be charged with a test gas (see 4.2.1) to a pressure of
500 psig. With this pressure maintained, the cylinder shall be submerged in water for 2 minutes.
All parts of the cylinder shall be covered with not less than 1 inch of water. Constraints
necessary to hold the cylinder in place shall not cover the welded seems of the pressure vessel.
Cylinders with two openings shall be tested after the SAE-AS4863 plug has been installed and
properly torqued. The cylinder shall pass the requirements specified (see 3.4.2). This test shall
not apply to cylinders greater than 2200 cubic inches.
4.5.4 Permanent volumetric expansion. The permanent volumetric expansion shall be
determined by hydrostatically testing the cylinder in a water jacket to a pressure of 750 psig for a
period of not less than 1 minute. The expansion shall be determined to an accuracy of 1 percent
or 0.1 of a cubic centimeter, and shall be recorded in cubic centimeters. The cylinder shall meet
the requirements specified (see 3.4.3).
4.5.5 Burst pressure. The cylinders shall be hydrostatically pressurized for 3 minutes to
within 95 percent of the pressure specified (see 3.4.4). Pressure shall be applied at the rate of
25,000 +10,000 psi per minute. The cylinders shall then be tested hydrostatically to destruction
and the bursting pressure recorded. The cylinders shall pass the requirements specified (see
3.4.4). At the supplier s option a cylinder tested for cyclic endurance (see 4.5.5.1) may be used
for this test.
4.5.5.1 Cyclic endurance. The setup for this test is identical to that used during the
burst test (see 4.5.5). The test cylinder shall be hydrostatically pressurized to the pressure
specified +50 psi (see 3.4.4). Pressure shall be applied at a rate of 25,000 +10,000 psi per
minute for 1000 cycles. The pressure shall drop below 50 psig each cycle. After completion
of this test, the cylinder shall then be subjected to the burst pressure test (see 4.5.5). The
cylinder shall pass the requirements (see 3.4.4.1).
4.5.6 Macrostructure (deep acid etch). Longitudinal sections from the cylinder, taken
from the burst cylinder (see 4.5.4), shall be etched in an aqueous solution containing 50 percent
0
0
hydrochloric acid by volume and maintained at a temperature of approximately 160 F (71 C) for
sufficient time to show the presence of defects. The sections shall then be visually examined by
a metallographist and shall pass the requirements specified (see 3.4.5).
4.5.7 Welding (radiographic inspection). The longitudinal and circumferential sections
of cylinders shall pass the inspection requirements of AWS D17.1. This shall be done prior to
the installation of any strapping which otherwise would cover the weld. The welds of each end
fitting (if required) and the welds used to attach reinforcing strapping shall not require
radiographic inspection. The welded sections shall pass the requirements specified (see 3.3.1).
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