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
