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This is a multi-part message in MIME format. ------=_NextPart_000_0004_01BF39D7.07A578E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit There's an interesting FAQ on this subject on the AEROX site (An aviation oxygen equipment supplier) http://www.avweb.com/sponsors/aerox/oxygen.html According to this FAQ: "Both USP Oxygen and Aviators Breathing Oxygen require assays to confirm that there are no harmful contaminants. The assays for these two types are virtually identical, and both are acceptable for aircraft use. (Reference: Aviation Safety, August 1, 1994, "Staying Safe on Oxygen" by Doug Ritter and Larry Putnam, M.D" It further states: "In the U.S., there are four types of oxygen: reagent, welding, medical (USP), and aviators breathing oxygen (ABO). We will deal only with the latter three types. They are produced cryogenically and differ only according to the assay required. Of most interest to pilots is the "old wives tale" that medical oxygen contains moisture. The fact is that all three types of oxygen (welding, medical and ABO) are at least 99.5% pure and usually exceed that standard. The Compressed Gas Association (CGA) stipulates that medical oxygen must have a dewpoint of not higher than -60F, but goes on to say that "typical analysis by volume" is -75F and liquid oxygen is typically -95F. Aviators oxygen is required to have a dewpoint no higher than -82F. In theory, there could be a difference, but in practice there is none." Also, apparently pilots have the same trouble getting USP oxygen and have to play some of the same games that divers do with gas suppliers. It's interesting reading. ------------------ Regards, Kent Lind Juneau, Alaska ------=_NextPart_000_0004_01BF39D7.07A578E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD W3 HTML//EN"> <HTML> <HEAD> <META content=3D"text/html; charset=3Diso-8859-1" = http-equiv=3DContent-Type> <META content=3D'"MSHTML 4.72.3110.7"' name=3DGENERATOR> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT color=3D#000000>There's an interesting FAQ on this subject on = the AEROX=20 site (An aviation oxygen equipment supplier)</FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000><A=20 href=3D"http://www.avweb.com/sponsors/aerox/oxygen.html">http://www.avweb= ..com/sponsors/aerox/oxygen.html</A></FONT></DIV> <DIV><FONT color=3D#000000><BR>According to this FAQ: = </FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000>"Both USP Oxygen and Aviators Breathing = Oxygen=20 require assays to confirm that there are no harmful contaminants. The = assays for=20 these two types are virtually identical, and both are acceptable for = aircraft=20 use. (Reference: Aviation Safety, August 1, 1994, "Staying Safe on=20 Oxygen" by Doug Ritter and Larry Putnam, M.D"</FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000><BR>It further states:</FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000>"In the U.S., there are four types of = oxygen:=20 reagent, welding, medical (USP), and aviators breathing oxygen (ABO). We = will=20 deal only with the latter three types. They are produced cryogenically = and=20 differ only according to the assay required. Of most interest to pilots = is the=20 "old wives tale" that medical oxygen contains moisture. The = fact is=20 that all three types of oxygen (welding, medical and ABO) are at least = 99.5%=20 pure and usually exceed that standard. The Compressed Gas Association = (CGA)=20 stipulates that medical oxygen must have a dewpoint of not higher than = -60F, but=20 goes on to say that "typical analysis by volume" is -75F and = liquid=20 oxygen is typically -95F. Aviators oxygen is required to have a dewpoint = no=20 higher than -82F. In theory, there could be a difference, but in = practice there=20 is none."</FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000>Also, apparently pilots have the same trouble = getting=20 USP oxygen and have to play some of the same games that divers do with = gas=20 suppliers. It's interesting reading.</FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000>------------------<BR>Regards,</FONT></DIV> <DIV><FONT color=3D#000000></FONT> </DIV> <DIV><FONT color=3D#000000>Kent Lind<BR>Juneau, = Alaska</FONT></DIV></BODY></HTML> ------=_NextPart_000_0004_01BF39D7.07A578E0-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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