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Hi Chris,
I was lurking on the techdiver listserver & picked up the thread on O2
filling with air from an 'oily' compressor. Several Liverpool University
divers
are going on Kevin Gurr's nitrox course in a couple of weeks...so all may
become
clear then, however in the meantime I have several questions you may be able to
help with...
On Thu, 13 Apr 1995 10:15:23 GMT Chris Hellas wrote:
> The problem is not just the speed of O2 decant. Agreed, with slow
fill rates the adiabetic compression
> is low, but the potentia danger lies in using std HP air compressor. Over a
period of time contaminant build
> up will start to become an issue in an O2 clean system. We always double
filter. This is not so difficult in the
> field, since portable additinal filters are readily available to supplement
the one fitted to any compressor
> you are using. As far as safety improvements for using dirty tanks and oily
air - don't use either!.
To get hold of high O2 % nitrox for deco may be difficult & expensive
for us in Liverpool. At present we can buy Nitrox_1 or Nitrox_2 if we trek
1+1/2 hours up to Blackpool (who want us to leave our cylinders there & come
back for them the next day !!) or we can go to Chester..3/4 hour away. In
either case they charge #7 /fill for 'standard' nitrox fills, ie Nitrox 1 or 2,
but they want #10 or #12 for 'custom' high % nitrox fills. Getting our deco
bottles filled with high % O2 nitrox seems a high cost both in terms of time &
money.
An alternative is to get in several O2 cylinders, an O2 analyser & some
decanting hoses & mix our own nitrox. I had assumed however that this route
also involved the high cost purchase of an 'oil-free' compressor. I have now
recently become aware of the possibility of using our existing 'oily'
Bauer compressor and adding an efficient oil removal filter to the end of the
line. Your posting reaffirms this possibility. Some questions we need to
consider :
What are the costs of the filter (purchase and running costs) ?
Are there any disadvantages ?
How do you know that the filter is working ?
How many hours do you get out of one filter ?
How easy is it to refill the filter (cartridge or loose filter
material) ?
Do you have the address of a supplier of such a filter in England ?
Regards, Steve M.
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* Senior Lecturer, * *
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