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Test -cont
Coupling Pull-out Test.-cont

TM-5-4220-226-14P MK12 Surface Supported Diving System (SSDS) (NSN 4220-01-097-5674) Manual
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TM 5-4220-226-14&P 6-5.  Umbilical Maintenance-continued. (g)  Lay specimen out straight on a flat surface. (h)    Observe  pressure  gage;  increase  hydrostatic  pressure  SLOWLY  until  specimen  bursts;  secure hydrostatic pressure. NOTE Minimum acceptable burst pressure is 2400 psi. If  specimen  fails  burst  test,  each  hose  bearing  the  same date is to be removed from diving service. If specimen passes burst test, each hose from the same lot and  the  unburst  tested  section  of  specimen  hose  may  be continued in service until the next annual testing period. (i)  Remove specimen from hydrostatic pressure source. (j)  Remove pressure gage. (k)  Reinstall coupling and new clamps on unburst tested specimen hose if specimen passes burst test. 1  Roughen cut end of hose with sandpaper. 2  Coat roughened end surfaces with rubber cement. 3    Seal  end  surfaces  with  Neoprene  or  polymarized  rubber  washer  (1-inch  OD  x  1/2-inch  ID  x 1/16-inch thick or 3/4-inch OD x 3/8-inch ID x 1/16-inch thick) as required. 4  Install coupling.  If lubrication is required use water only. 5  Install three clamps on MIL-W-2845 hose, three clamps on 3/8-inch hose equally spaced along shank.    Clamps  shall  be  tightened  until  the  clamp  depressses  the  hose  so  that  daylight appears when a straight edge is held along the outside surface of the hose. 6  Perform coupling pull-out test. (3)  Coupling Pull-out Test. WARNING Hydrostatic  testing  is  potentially  dangerous  due  to  the  high pressures involved and unpredictable results. Clear    area    before    conducting    test    to    avoid    injury    to personnel. Ensure    all    air    has    been    removed    from    hose    before conducting test. 6-4









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