Gasmizer Manual - Submarine Manufacturing and Products Ltd

March 09
8.9 Fault Finding
8.9.1 Fault Finding GASMIZER System
Symptom:
Cause:
Remedy:
Symptom:
Cause:
Remedy:
Exhaust hose pressure above BPR value but booster suction is at correct
value and no gas flow through reprocessing unit.
Float valve in reprocessing unit closed.
Close Reprocessing unit inlet valve and open vent valve at the bottom of
the float valve and Filter 1 until the float can be heard to drop and all the
water is removed from the float chamber and filter 1. Also, check receiver
1 and receiver 2 for water. Close drain valve and open exhaust return
valve VERY SLOWLY otherwise the float will be blown to the top of the
chamber and the same problem will recur.
Booster discharge pressure very high and no flow through reprocessing
unit. Volume tank supply pressure well below booster discharge pressure.
Both scrubber canisters turned off so that there is no route through the
system for the gas.
Place one scrubber canister on line.
8.9.2 Fault Finding GASMIZER Bell Equipment
Symptom: Diver loses suction at the Helmet Exhaust valve and finds difficulty
exhaling: Diver goes “Open Circuit”.
Cause (A): Suction dropping due to booster having stopped.
Remedy: Start booster.
Cause (B): SAECO valve shut, closing off exhaust circuit. Bellman should check pin
at top.
Remedy: Ensure that diver has adequate supply pressure 10 bar (145 psi)
minimum from the bell panel. Check whether bellman has turned diver’s
supply gas off.
Cause (C): Bellman may have shut diver exhaust manifold valve on the bell water
trap.
Remedy: Open valve.
Cause (D): Hull valve 8 may have been closed by mistake.
Remedy: Open hull valve 8.
Cause (E): Diver tracking pneumo not following the diver and diver working above
bell. (If Used)
Remedy: Adjust diver tracking pneumo to give a bleed of approximately 0.4 litres
per minute.
Cause (F): BPR loader in the bell not set up properly. See table’s 8.6.
Remedy: Bellman closes valve 5 on the exhaust and sets up as on bell pre-dive
checks.
Cause (G): Bell umbilical and external water trap filled with water.
OM002 Rev 5 Page 94 of 168 Chap 8