 |
|||
|
Page Title:
Hydrostatic Pressure test (breech mechanism) |
|
||
| ||||||||||
|
|  MIL-T-82570A(OS)
*
4.4.4.24 A C02 bottle of sufficient volume to cool the thermoswitches for
the performance of the dielectric strength test, the barrel heater resistance
test, and the heater circuits operating-current test.
*
4.4.4.25 A 125 plus or minus 2 vdc power supply with a 2.7 plus or minus
0.1 k ohm series resistor.
*
4.4.4.26 Pressure fitting adapter (NAVSEA Dwg 3245120).
*
4.4.4.27 Nitrogen bottle of sufficient volume to purge the breech mech-
anism air flasks.
*
4.4.4.28 A 0.024 plus or minus 0.0005 inch diameter orifice for the high
pressure air source of 4.4.4.30
4.4.5 Test procedures. The following tests shall be performed:
WARNING
When working with high pressure air or electrical
apparatus, observe all safety precautions (see 3.2.8).
*
4.4.5.1 Hydrostatic Pressure test (breech mechanism). With the breech
mechanisms removed from the tube assembly, remove Pressure Gage 1623922 and
insert a standard l/8-pipe plug in the void. The breech mechanisms shall
be filled with water and pressurized to 4500 plus 20 minus O psig. This
pressure shall be maintained for 10 minutes minimum without failure of any
part. At the completion of this test reduce the pressure to zero, drain
the breech mechanism and purge with dry nitrogen. Reinstall Pressure Gage
1623922.
*
4.4.5.2 Pneumatic system pressure drop test. This test shall be per-
formed on each barrel of the torpedo tube assembly. Remove the breech
mechanism and securing mechanism from the barrel. Secure the nipple attached
to the manifold and piping assembly to a shutoff valve or other suitable
blanking device. Adjust the air source to 2000 plus O minus 20 psig and
attach it through a 0.024 plus or minus 0.0005 inch diameter orifice to the
barrel pneumatic system using a Pressure Fitting Adapter (NAVSEA Dwg 3245120).
Actuate the firing solenoid valve and allow the pneumatic system line pressure
to stabilize. The pressure as measured on the barrel side of the orifice
shall stabilize at 1350 psig minimum. Repeat this test with the securing
mechanism installed in the barrel. The pressure in the pneumatic system
shall then stabilize at 750 psig minimum. At the conclusion of this test
there shall be no deformation or failure of any part of the pneumatic system.
14
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals