TM  5-4220-231-14&P g. REMINDER: For   Department of  Transportation (DOT)    specification and    exception, the   cylinder certification date    starts    when    the   manufacturer hydrostatically tests    a  cylinder     and    marks    that   date    as   the   date of  manufacture. The    time    between hydrostatic test    is  the   actual    time    elapsed from   the   date    on  the   cylinder. h.    STORE FLASKS    OUT   OF   THE   WEATHER. 3-35 Transportation Limitations. Due to    temperature restrictions of   the SDASS equipment and the necessity of  maintaining an   airtight system, the   following limitations and    conditions must be   observed during transportation. a. Do   not   use a  forklift   to   move subassemblies under any   circumstances. b. DASS racks must be   lashed together when stacked for   transportation in  any    mode. c.   Local    state and   federal regulations will  be  followed when    the    SDASS is transported by   air,  rail,   water or   ground modes. d. All  subassemblies will   be   properly secured during shipment by  any    mode to  avoid shifting which could    cause damage to  the    equipment. e.   After   transporting the   SDASS check all  connectors, fittings, pipes, gages, valves, etc.   for  looseness or  damage IAW  PMCS tables "Before" checks. Tighten and/or repair as   required. 3-36 Depreservation Of  The    High    Pressure Composite Air  Flasks. a. To   return the    air   flasks to   service after storage, vent the   flasks of  the    fry  nitrogen. b.   Check the   technical manual for  the   system and    perform any   maintenance that    is  required according to  the    Preventive Maintenance Checks and    Services section. c. Pressurize the   flasks with   diver's air,   from    an   authorized source, to  approximately 100   psi. d. Vent    the   flasks to  0   psi,   to  purge them of  any    remaining nitrogen. e. Pressurize the    flasks with   diver's air,  from    an   authorized source, to  a  minimum of  600   psi   up  to  the maximum pressure of  5000 psi. f.   Take an   air   purity sample. If the    sample meets purity    standards in  NAVSEA    0994-LP-001 -9110 (US    Navy Diving    Manual Volume 1),   the system is   ready for   diving. If the sample does not    meet purity standards, inspect the   flasks according to  the    instructions in  the   technical manual. Change 3 3-51/(3-52 blank)