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There is a filter that only starts working if the pressure is above 2000 psi which removes carbon monoxide. In most compressors, the pistons are bathed in compressor oil. Sometimes this ignites. The filter is designed to catch any CO. There are other filters for oil, CO2, and other contaminates present in the intake air. Most of the raw oil is caught in the first filter and there are generally six more filter components that catch everything else. When boosting, there are generally no such filter arrangements, but then they would only be necessary if there were some combustible material present, and generally one can assume that these materials are not in gas supplied by a gas vendor. However, this is all a "mute" point. Most oxygen boosting regimens are for situations like CCR's where a small oxygen supply tanks is used, as in the MK 16, where strict protocols are mandated for using high oxygen pressures both in the machine and the boosters. It is totally unnecessary in open circuit applications, and basically dumb. You can add oxygen and boost the inert helium with no special considerations, and you certainly do not need to jack one bottle of oxygen up for deco, as was explained by Miss Porceddu in her post. Actually for new divers and people who are taking "tech" courses who should not be, the agency solution is to add air on top of the oxygen or banked nitrox on top of oxygen to make more volume in some ridiculous mix such as "80/20" or "70/30" to make for more gas for hoovering newbies or so that neophytes who can not control their buoyancy ( but are taking high level "tech" courses anyway so the agency can make a buck) do not flail all over the place and tox themselves. Then comes the bright idea of boosting the oxygen to some ridiculous pressure to get more time, usually to accommodate some asinine unnecessarily long deco program or dive computer. I run 2000 psi in an aluminum 30 for ocean, and lp steel 15 litre Faber bottles for cave, but aluminum 80's are fine for that as well. .. ----- Original Message ----- From: <stuart.morrison@sw*.co*.uk*> To: <pina3@be*.ne*> Cc: <techdiver@aquanaut.com> Sent: Thursday, January 25, 2001 4:34 AM Subject: RE: postings > >In a compressor environment > > you have a > > filter to take out carbon monoxide > > Don't you mean hydrocarbons? > > > > Visit our web site at www.scott-wilson.com > > Privilege and Confidentiality Notice. > This e-mail and any attachments to it are intended only for the party > to whom they are addressed. They may contain privileged and/or > confidential information. If you have received this transmission in > error, please notify the sender immediately and delete any digital > copies and destroy any paper copies. > Thank you. > > > Scott Wilson Scotland Ltd > Registered in Scotland No. 48951, > Registered Office: 6 Park Circus, Glasgow, G3 6AX. UK. > > > ________________________________________________________________________ > This message has been checked for all known viruses, by Star Internet, > delivered through the MessageLabs Virus Control Centre. > For further information visit: > http://www.star.net.uk/stats.asp > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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