MIL-DTL-22606D(SH)
3.5.4 End plugs. End plugs shall be free of oil, grit, products of machining, and other debris. End plugs shall
be rinsed with detergent trisodium phosphate in accordance with O-S-642, or a commercially acceptable cleaner,
until the ultraviolet light examination shows no oil contamination when tested as specified in 4.2.3.
3.6 Surface protection. Within 24 hours after cleaning and drying, the flasks shall be given internal and
external surface protection as follows. If flasks are to remain uncoated for 24 hours or more, then protection against
corrosion, such as nitrogen inerting, must be provided. Flask threaded areas shall be uncoated.
3.6.1 Interior. Unless otherwise specified (see 6.2), Service A flask interiors shall be coated with 0.004 to
0.005 inch dry film thickness (DFT) of epoxy-polyamide green primer in accordance with MIL-DTL-24441/29,
Type IV, Formula 150. When the coating is dry, Service A flask interior surfaces shall show no oil contamination
when inspected as specified in 4.2.3. Flasks which fail the test shall be recleaned (see 3.5), recoated, and
reexamined until the flask passes the oil-free test. Service B and Service C flask interiors shall be uncoated.
3.6.2 Exterior. Following successful completion of the gas test (see 3.8) and prior to final cleaning (see 3.9),
flask and end plug exterior surfaces shall be coated as specified herein. Unless otherwise specified (see 6.2), the
exterior surfaces of each fully assembled flask shall be coated with a 0.002 to 0.004 inch DFT of green primer in
accordance with MIL-DTL-24441/20, Type III, Formula 150. Heavier thicknesses at spray paint intersections and
areas of potential buildup, such as skirt attachments, are acceptable, but shall be kept to a minimum consistent with
normal coating procedures.
3.7 Assembly. Non-welded end plugs shall be assembled to the flask with O-rings, back-up rings, and
retaining bands (see figure 8); and shall be torqued to 250 to 400 foot-pounds. Seal welded plugs shall be torqued to
800±200 foot-pounds prior to seal welding. When assembling plugs to flasks, no gap shall exist between the plug
shoulder and the flask sealing surface. When inspected as specified in 4.3.4.1, completed seal welds shall meet the
acceptance criteria specified in 3.3.2.
3.7.1 Thread coating. Threads shall be lubricated with grease in accordance with MIL-PRF-27617, Type III.
3.8 Gas leakage. When pressurized in accordance with 4.3.3.2, the assembled flask shall exhibit no evidence of
leakage through any portion of the seal weld or end plug.
3.9 Cleanliness. Following coating of flask exteriors (see 3.6.2), the flasks shall be final cleaned to the
requirements specified herein. Unless otherwise specified (see 6.2), Service A flasks shall meet the cleanliness
requirements in MIL-STD-1622 for general applications. When specified (see 6.2), Service A flasks shall meet the
cleanliness requirements in MIL-STD-1330. Prior to cleaning to MIL-STD-1330, Service B and C flasks shall be
visually inspected for defects as specified in 4.2.1 and shall be oil-free when inspected as specified in 4.2.3. Service
B and Service C flasks shall meet the cleanliness requirements in MIL-STD-1330.
3.10 Inerting. Flasks shall be preserved as follows: after final cleaning (see 3.9), each flask shall be evacuated
to an absolute pressure of 3 to 8 inches mercury. From this partial vacuum, the flask shall be pressurized with
nitrogen to a pressure of 5 to 25 psig. Unless otherwise specified (see 6.2), Service A flasks shall use commercial
grade dry nitrogen. For Service A flasks cleaned to MIL-STD-1330 and all Service B and C flasks, flasks shall be
inerted with nitrogen in accordance with A-A-59155 Type I. The charging pressure shall be determined at the
ambient temperature when the flask is charged. A 10-micron filter (or finer) shall be used when pressurizing the
flasks with nitrogen. Inerting caps shall be installed as shown on figure 13.
3.10.1 Inerting for emergency shipment. In the event that a carrier will not accept emergency shipment of
pressurized flasks, the flasks shall be charged to 5 psig with nitrogen in accordance with 3.10 and the pressure bled
down to 0 psig to meet carrier requirements.
3.11 Marking for identification. Flasks and end plugs shall be permanently marked as specified in 3.11.1 or
3.11.2 as applicable.
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