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While we are discussing the steel vs. aluminum issue... What happens to LP steels that are sometimes over-pressurized (ie 2240 tanks pumped to 3000) How does metal fatigue enter the picture? Thanks, Randy Z. ~~~~~~NEVER LET THE FACTS GET IN THE WAY OF A GOOD STORY!~~~~~~ (313) 39-02922 FAX (313) 845-5383 Pager (810) 890-3665 FoMoCo Vehicle Operations Maufacturing Engineer---Powertrain 1999 F-150, F-250, SVE, EXPEDITION and NAVIGATOR trucks. *** Forwarding note from I2361250--IBMMAIL 03/13/97 11:19 *** Date: Thu, 13 Mar 1997 08:12:15 -0500 To: Bob Favorite <rwfavorite@uc*.ed*>, techdiver@aquanaut.com From: Art Greenberg <artg@ec*.ne*> Subject: Re: Steel vs. Aluminum for O2 Cylinders At 06:21 PM 3/12/97 -0800, Bob Favorite wrote: > As far as steel vs. Al for O2 the increased O2 content can cause >rusting and the rusting uses up the O2 resulting in decreased pO2. Al >will stop rusting once a surface layer of oxidation has formed but this is >not true for steel it will continue to rust until all the metal present is >oxidized. Bob, An interesting point, which raises questions: - Is there a rule of thumb (or anything more precise than that) that says how long a steel cylinder can be used for O2 service? (IOW, what's the expected lifetime in O2 service vs. expected lifetime in air or other low PPO2 service?) - Does this imply that steel cylinders used for O2 should be inspected more frequently than once per year? - Since the rate of oxidation is related to PPO2, would it be wise to drain down and fill steel cylinders used for O2 service with OCA or any other suitable low PPO2 mix when not in use for a while? - Does the way aluminum behaves imply that it's a bad idea to tumble aluminum cylinders used for O2 service? =Art= -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'. ---- End of mail text Additional SMTP headers from original mail item follow: Received: from bighorn.terra.net by ibmmail.COM (IBM VM SMTP V2R3) with TCP; Thu, 13 Mar 97 11:19:07 EST Received: (mail@lo*) by bighorn.terra.net (8.7.6/jr2.10) id IAA01609; Thu, 13 Mar 1997 08:13:58 -0500 Precedence: bulk Errors-To: owner-techdiver@aquanaut.com Received: from bighorn.terra.net (root@lo*) by bighorn.terra.net (8.7.6/jr2.10) with EXEC id IAA01485; Thu, 13 Mar 1997 08:12:23 -0500 Received: from mail.eclipse.net (root@ma*.ec*.ne* [207.207.192.13]) by bighorn.terra.net (8.7.6/jr2.10) with ESMTP id IAA01481; Thu, 13 Mar 1997 08:12:21 -0500 Received: from pralix (pralix.sarnoff.com [130.33.10.112]) by mail.eclipse.net (8.7.4/8.7.3) with SMTP id IAA29739; Thu, 13 Mar 1997 08:12:16 -0500 (EST) Message-Id: <2.2.32.19970313131215.008f45bc@ma*.ec*.ne*> X-Sender: artg@ma*.ec*.ne* X-Mailer: Windows Eudora Pro Version 2.2 (32) Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send list subscription requests to `techdiver-request@aquanaut.com'.
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