MIL-DTL-22606D(SH)
4.3.3 Pressure tests.
4.3.3.1 Flask hydrostatic test. Each flask shall be tested to the hydrostatic test pressure specified in table I.
Testing shall be conducted using either the Dynamic Pressure Test in accordance with S9551-AM-MMM-010 or the
Water Jacket Method in accordance with CGA C-1. A deviation from a straight line on the Dynamic Pressure Test
graph shall constitute failure of the test. A permanent expansion exceeding 10 percent of the total volumetric
expansion during the Water Jacket test shall constitute failure of the test. Tap water shall be used for the hydrostatic
test. Neither the water nor the flask shall be heated. The test pressure shall be held at least 5 minutes before the
flask is visually inspected for compliance. Following the volumetric expansion inspection, each flask shall be
inspected for defects as specified in 4.3.4.2 and 4.3.4.3. Any flask that fails the hydrostatic test shall not be offered
for delivery.
4.3.3.2 Gas leakage test. Each fully assembled flask shall be pressurized with clean, dry air or nitrogen (as
defined by MIL-STD-1622) to the maximum allowable working pressure specified in 1.2.2. The test pressure shall
be held at least 5 minutes before the flask is inspected for compliance with 3.8. A leak test solution shall be applied
to all joints to detect leakage. For Service B and Service C flasks, the leak detection compound shall comply with
MIL-PRF-25567 or equal. Any flask that fails to comply with this test shall not be offered for delivery.
4.3.3.3 End plug hydrostatic test. Each end plug intended for use with flasks made to this specification shall be
pressurized, using clean water, to 8330+200/-0 psi. The test pressure shall be held at least 5 minutes before being
inspected for compliance with 3.4.2. Any end plug that fails to comply with this test shall not be offered for
delivery.
4.3.4 Nondestructive tests.
4.3.4.1 Weld inspection. Weld inspection shall be by magnetic particle (MT) examination in accordance with
T9074-AS-GIB-010/271. Liquid penetrant (PT) examination in accordance with T9074-AS-GIB-010/271 may be
substituted for MT where MT is impractical.
4.3.4.2 Flask magnetic particle inspection. Hemispherical ends and necks of each flask shall be subjected to
magnetic particle examination in accordance with T9074-AS-GIB-010/271. Flasks shall be visually inspected in
4.3.4.3 Flask ultrasonic inspection. Each flask shall be ultrasonically examined over 100 percent of the
external cylindrical section to a point 3 inches beyond the start of curvature of the integrally formed head, except
where prevented by welded attachments (i.e., lifting lugs, skirts, body rings, etc.). Ultrasonic examination shall be
conducted in accordance with T9074-AS-GIB-010/271 using shear wave testing in both the circumferential and
axial direction, and longitudinal wave testing.
4.3.4.3.1 Flask shear wave acceptance. Any flask having an indication greater than 100 percent of the
calibration level shall be rejected. Any flask having an indication of between 50 and 100 percent of the calibration
level, and over 3 inches in length shall be rejected unless approved by NAVSEA or the agency concerned. Other
ultrasonic indications over 25 percent of the calibration level shall be submitted for information to NAVSEA or the
agency concerned as part of the test report.
4.3.4.3.2 Flask longitudinal wave acceptance. Any flask showing a 100 percent loss of back reflection shall be
rejected. Flasks showing a loss of back reflection of between 50 and 100 percent, which is linearly disposed, and
which totals 6 inches or more in 12 inches of flask length, shall be rejected. Areas of flasks showing a loss of back
reflection between 50 and 100 percent, which are greater than 3 inches in length, shall be noted in the report. Any
discontinuity signal accompanied by a loss of back reflection greater than 25 percent shall be reported.
4.4 Retests.
4.4.1 Mechanical retesting. If specimens fail the tests specified in 4.3.2, the test specimens and lot it represents
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