Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
Gasmizer Manual - Submarine Manufacturing and Products Ltd
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March 2009<br />
Remedy: Diving may be continued by backing off very slightly on BPR loader in dive<br />
control. Set up to 1 bar below recommended value. Drain umbilical <strong>and</strong><br />
water trap at the end of the bell run <strong>and</strong> check for lose fittings on the<br />
outside of the bell. Ensure that the divers helmet <strong>and</strong> mask are in good<br />
condition <strong>and</strong> not leaking water <strong>and</strong> the oral nasal properly fitted to lower<br />
exhaust connectors. Most importantly, bellman must always drain lower<br />
part of the internal water trap when filled with water.<br />
Symptom: Pressure increase in the system volume tank when make-up regulator is<br />
not flowing.<br />
Cause (A): Diver using st<strong>and</strong>by onboard gas instead of umbilical supply in the bell.<br />
Remedy: Diver put on umbilical supply.<br />
Cause (B): St<strong>and</strong>by going down as umbilical supply <strong>and</strong> coming back up the exhaust<br />
hose to the volume tank.<br />
Remedy: Regulate st<strong>and</strong>by gas below make up regulator pressure.<br />
Symptom: Gas escaping from the bell into the exhaust circuit <strong>and</strong> the bellman has to<br />
blow down regularly to prevent water coming up the bell trunking.<br />
Cause (A): Scrubbing valve 3 open.<br />
Remedy: Close valve 3.<br />
Cause (B): Water trap drain valve 7 open with isolation valve 6 pushed in.<br />
Remedy: Close valve 7.<br />
Cause (C): Leaks at inward relieving valves on umbilical fitting below valve 5.<br />
Remedy: Remove caps <strong>and</strong> check for gas being sucked into valves. Also check that<br />
relief valves on top of water trap are not relieving inwards by removing the<br />
caps.<br />
Cause (D): Valve 9 opened too far.<br />
Remedy: Set valve 9 as per bell check-off sheet.<br />
Cause (E): O-rings on isolation valve damaged or water trap large O-rings leaking.<br />
Remedy: Replace damaged O-rings.<br />
Cause (F): Hose to helmet not being dived disconnected, <strong>and</strong> valve 5 knocked open.<br />
Remedy: Close valve.<br />
Symptom: A great deal of gas being used for the dive but the diver assures the<br />
supervisor that he is on closed circuit <strong>and</strong> losing very few bubbles at this<br />
helmet.<br />
Cause (A): Diver tracking pneumo flow set far too high.<br />
Remedy: Set to correct flow in the bell of 0.4 litres/min. maximum. When the diver<br />
leaves the bell there should be one bubble every 10-20 seconds at the<br />
tracking pneumo end on his umbilical.<br />
Cause (B): Loose fittings on the outside of the bell or the inside of the bell losing gas.<br />
Remedy: Tighten up all fittings.<br />
Chap 8 Page 95 of 168 OM002 Rev 5