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DSAT Gas Blender October 15, 2009

Posted by Chris Sullivan in Training.
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I just took this course. The manual was well laid out and the exam was reasonably difficult but not too tough ( got 98%, after changing one answer from right to wrong). In addition to the classroom  stuff we took apart some tanks, cleaned  and inspected  them, reassembled, and filled them with Nitrox. There was nothing too surprising  except on 2 of the tanks there were hydrocarbon deposits showing up under the UV light on the threads. Fortunately my tank was free of them.

The course covers air station system design for oxygen rich environments, O2 cleaning, gas mixing, trimix, and various other components and represents a combination of several courses from other agencies (most separate trimix blending from nitrox) so is a good value. To become an instructor for this course after taking it, one either needs to take a special  instructor course, or do 50 mixes to +/- 1% and apply after a 6 month waiting period, in addition to being an open water instructor, of course.

My tank valve was a different design to the others.  Larger, more parts, metric sizes, and so on.  It’s a DIN valve vs. the usual yoke valves that on the store’s rental tanks.

The course also covers blending trimix, and comes with the DSAT gas mixing calculator, which makes the determination of how much of each gas to blend trivial. It doesn’t adjust for molecular size and intermolecular forces by using Van Der Waals equations or other esoteric methods so at higher pressures it would be  a little bit off for Trimix.

I think, though, that in practice it’s difficult for any low volume operation to follow all the  recommended practices 100%. With an O2 clean VIP running around $30 retail, it  would really be difficult to go through the  full procedure  economically. That’s where the experience of having practical methods to maintain a safe system really count.

When I get my card I’ll update  my bio on this blog.

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1. Blending Trimix « Chronicle of an older diver - October 25, 2009

[…] Nitrox, SCUBA, Scuba Diving, Scuba Training, Technical Diving, Trimix trackback As described in a prior post, I recently took the DSAT Gas Blender course which includes Trimix blending. No formulas were […]

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