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From: "Gerrit Conradie" <CONRADIE@fi*.su*.ac*.za*>
Organization: University of Stellenbosch
To: techdiver@terra.net
Date: Thu, 2 May 1996 12:47:32 GMT+200
Subject: Nitrox blending (was CLEANING&..)
Will somebody please amuse me by giving me some details on how the
"continuous blending method" for filling a cylinder with nitrox works?

I've just started an ANDI course (I like the instructor, can't care
about the agency), and it seems the author of the manual is quite
vehemently against the partial pressure filling method.  The reasons
I can understand, "how do you know whether a cylinder is O2 clean".
I can have my cylinder cleaned, and then just fill it with my own
compressor without anybody the wiser.

The way I see a "continuous blending method" is to make a "Y" split
in the line coming from the air compressor and an O2 cylinder, where
you can just control the flow of O2 to mix constantly with the air
from the cylinder.  With such a method you'll only need to ensure
that a certain small part of your system is clean, not the customer's.
Right, wrong?  How difficult is it to set up such a system?

On a related note, how do you O2 clean a cylinder?  Can't be that
difficult and I'd like to know how much I'm going to be ripped off
for a clean.

Thanx
- Gerrit

 ******************************************************************
 G Conradie  [\]                         Phone: +27 21 808 4452 (W)
 Dept. E & E Engineering                        +27 21 887 0880 (H)
 University of Stellenbosch              Fax:   +27 21 808 4981 (W)
 Stellenbosch, 7600                 Url: http://www.sun.ac.za/
 South Africa                       Email: conradie@fi*.su*.ac*.za*
                    " Just do it "
 ******************************************************************

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