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 />
4.3.4 The negative pressure gauge indicates the pressure in both the water trap <strong>and</strong> the<br />
divers umbilical. The overpressure relief valve is set to lift at 30 psi (2 bar). Typically, it would<br />
protect the water trap in the event that all valves were closed <strong>and</strong> the bell was being<br />
depressurised.<br />
4.3.5 The negative pressure relief valve is set to lift at 3.5 bar (-50 psi). This could occur if<br />
the bell BPR was improperly loaded or the bell was being pressurised with valves to the water<br />
trap closed.<br />
4.4 Back Pressure Regulator<br />
4.4.1 The function of the back pressure regulator is to control the pressure in the diver’s<br />
umbilical to give a minimum breathing resistance. Essentially, it consists of two slotted sealing<br />
faces enclosed by a rubber boot. This assembly is housed inside a sealed pressure chamber<br />
into which a reference pressure may be applied. The operation of the system is described in the<br />
diagrams overleaf.<br />
Chap 4 Page 25 of 168 OM002 Rev 5
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