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To: gasdive@sy*.di*.oz*.au*
Subject: Re: mixing your own + gas purity
From: chris@de*.de*.co*.uk* (Chris Hellas)
Cc: techdiver@opal.com
Date: Mon, 24 Apr 1995 17:02:56 GMT

Hi Jason

The following minimum purity standards are accepted by the Dept of Energy,
Association of Diving Contractors and the Norwegian Petroleum Directorate.

Specification for Oxygen + Helium

Diving Grade Helium >99.97% pure
Diving Grade Oxygen >99.50% pure

Contaminant             Oxygen         Helium
___________             ------         ------
Nitrogen                1000 ppm       200 ppm
Oxygen                    -             50 ppm
Carbon Dioxide            10 ppm        10 ppm
Carbon Monoxide            1 ppm         1 ppm
Neon                      10 ppm        10 ppm
Argon                   4000 ppm        25 ppm
Hydrogen                  10 ppm        10 ppm
Methane                   25 ppm         5 ppm
Other Hydrocarbons         3 ppm         1 ppm
Moisture                  25 ppm        25 ppm

Oil mist should not exceed 1mg/cubic metre

Hope this info is some use 

Regards

Chris


Chris@de*.de*.co*.uk*

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