JFD Divex SLS Mk IV, Operation And Maintenance Manual

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OM131 29
P1939-OM-131 R11 Chapter 2
The two hot water systems utilised for diver heating are as follows:
1. Primary Gas Heating (Ultrajewel 601)
The diver’s primary gas heating system utilises the DSI Heating Shroud Kit. This flows hot water
over the Helmet side-block assembly, the bent tube assembly and the Ultraflow 601 regulator body.
The supply of hot water is taken via a splitter block and requires a flow of 2 to 6 lpm of hot water
(taken from the suit supply of 10 to 30 lpm). The Divex splitter block automatically provides sufficient
flow to the diver’s suit and the hot water shroud (assuming sufficient hot water is supplied from the
vessel supply - NPD requirements state '30 lpm shall be provided at the diver’s hot water
connection').
2. CO
2
Scrubber Heating (SLS Mk IV)
The flow from the splitter block to the primary gas heater shroud is first passed through an outer
annulus surrounding SLS System’s CO
2
scrubber canister. No additional hot water is required for
the SLS System. With the CO
2
scrubber pre-heated, the carbon dioxide absorption will start
immediately upon system actuation. The exothermic reaction of sodalime will then generate
sufficient heat to maintain the gas temperature with the diver’s hot water supply cut off. This is one
of the main benefits of using the SLS System. Even with the diver’s hot water supply cut off, warm
gas is still provided, helping to maintain his core body temperature.