Product category:
Gas atmospheres and generation
News Release from: Witt Gas Techniques | Subject: MG50-2ME+SOA for diving gas
Edited by the Processingtalk Editorial
Team on 01 September 2006
Gas mixer for use on N Sea diving
support vessel
An electronic gas mixer has been ordered for use on the new diving/construction support vessel DSV Bibby Sapphire, to mix oxygen and heliox gases, for divers working at up to 300 meters
A specially designed electronic gas mixer has been ordered by Bibby Offshore from Witt Gas Techniques, the Warrington based gas safety, control, mixing and analysis equipment supplier, for use on their new diving/construction support vessel DSV Bibby Sapphire This gas mixer is a stationary system that will be used to mix oxygen with heliox, the breathing gas made from oxygen and helium, used by deep sea divers working at depths up to 300 meters
This article was originally published on Processingtalk on 17 Mar 2003 at 8.00am (UK)
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It will mix the correct percentage (user defined) of oxygen and heliox for the required depth; the deeper the depth the less oxygen is required in the gas.
It has a better than +/-1% absolute mixing precision.
It has two gas inlets, one of which is oxygen and the other heliox.
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From the inlets it mixes the heliox with the required oxygen content.
It has a built in oxygen gas analyser to monitor the oxygen levels in the mixture, whilst pressure switches monitor the gas supply pressure.
A touch screen control is used to input the required mixture compositions.
From the mixer the gas goes to a compressor and onto the storage tubes for use by the divers.
DSV Bibby Sapphire operates in the North Sea and worldwide.
The vessel deploys divers to depths between the surface and 300 meters.
The deeper the depth the divers are deployed to, more decompression is required.
The vessel operates a diving technique to maximise the working time of the divers, which involves them living at a pressure equivalent to the water pressure at which they are working.
The divers live in a 15 man saturation dive chamber on board the vessel and transfer at the same pressure to a diving bell, which is then deployed to the working depth.
The divers can operate at this depth for periods up to eight hours.
They return to the bell, which returns to the surface and they transfer back to the chamber and continue to live at this pressure.
This pattern is repeated until the job is complete or they have reached the time limit imposed for this cycle, which is 28 days including decompression.
A storage pressure of 11 bars absolute at 100 metres working depth would require a decompression of approximately 5 days.
The 94 metre long DSV Bibby Sapphire is fitted with a DP class 2 dynamic positioning system and has a transit speed of 15 knots.
It also includes a heavy lift crane, 850sq.m working deck space, a helideck, fire fighting capability and accommodation for up to 197 persons.
Carl Long, General Manager, Witt Gas Techniques said: "Our gas mixers are used in a wide variety of industries ranging from food production to welding.
This particular gas mixer is a derivative from a mixer (MG50-2ME+SOA) used to supply high purity (synthetic) air in hospitals, so it is designed to be very reliable and it has a number of built-in safety features, including an optical alarm being triggered if the inlet pressure is too low, when the system automatically shuts down.
We have previously supplied mixers for professional diving, with one of our mixers being used on Calypso, Jacques Cousteau's research vessel.".
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