MIL-STD-1411B
3.10 Condemned cylinders. Condemned cylinders will be forwarded to the Inventory Manager (IM) and Defense Reutilization and Marketing Office (DRMO), or as directed by contract for degrading and disposal. Condemned cylinders will include cylinders that are degraded by damage, corrosion, exposure to fire, cylinders specifically listed by government or industry standards as cylinders not in accordance with current DOT regulations, or cylinders that have failed hydrostatic testing or UE. Condemned cylinders also include the rejected cylinder that cannot be maintained or repaired and returned to useful service.
3.11 Cryogenic fluids. Cryogenic fluids are defined as permanent compressed gases that have been cooled below their boiling point (below -150 °F) and liquefied. Evaporation of the integral fluid and insulated containers maintain the stability of cryogenic fluids in storage. Examples are liquid oxygen, nitrogen, and argon.
3.12 Cylinder service pressure and proof pressure. The service pressure for each cylinder is permanently marked on the cylinder immediately following the DOT specification (DOT 3AA 2015 or DOT 4BA 240). For the purpose of this document, high-pressure cylinders are those with a marked service pressure of 900 psig or greater; low-pressure cylinders are those with a marked service pressure less than 900 psig. At manufacture, each cylinder is tested at its proof pressure. The service pressure is the maximum pressure for a given cylinder in normal gas service. The proof pressure is the pressure (5/3 x service pressure) at which a cylinder is hydrostatically tested. Low-pressure cylinders may be proof tested at two times the service pressure in accordance with the modified hydrostatic test method listed in 49 CFR 178.814. The working pressure of cylinders charged with permanent gasses will drop as the contents are released. Cylinders charged with liquefied gas will hold a constant working pressure related to the temperature and the vapor pressure for the specific liquefied gas as long as liquid remains in the cylinder.
3.13 Cylinders subjected to fire. Government cylinders subjected to fire are not returned to service, however, commercial cylinders neither over 0.25 percent carbon nor over 0.90
percent manganese need not be reheat-treated, but must pass hydrostatic retest. Acetylene cylinders neither over 0.25 percent carbon nor over 0.90 percent manganese are inspected for damage to the porous filler. If no damage is found in the shell and the porous filler is undamaged, the cylinder may be returned to service without reheat treatment or hydrostatic test. All other cylinders are reheat-treated, reconditioned, and tested in accordance with
49 CFR 173.34g before returning to gas service.
3.14 Department of Transportation (DOT). DOT is the federal agency responsible for the requirements of shipping hazardous materials, including compressed and liquefied gases. In this capacity, DOT maintains Title 49 of the Code of Federal Regulations (CFR), which covers most of the detailed shipping requirements for compressed gases. Additional regulations for air and sea shipments are included in Titles 14 and 46, respectively. Government cylinders are considered subject to the CFR by this standard, however, the CFR provides special allowance for emergency military shipments. Special privilege in no way relieves the military of certifying the safety of these shipments. The responsibility for 49 CFR, formerly maintained by the Interstate Commerce Commission, has been transferred to the Office of Hazardous Materials Safety, which is part of the Department of Transportation. Therefore, all ICC prefixes for cylinder specifications remain acceptable and all new cylinders will be marked with DOT prefixes
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