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I have been using stainless steel fittings and needle flow valves for at least 7 to 8 years with high pressure O2 mixing (up to 3500 psi.). Recently I was helping a friend put together O2/mixing transfer whip. This heated discussion broke out about stainless steel vs high pressure O2 (3500 psi) The problem I am having is, it is very hard to find 4000 psi service needle flow control valves, restrictors or fittings made from brass 360. Most of them are 3000 psi service. I personally don�t like to take the fittings or the valves to their maximum working pressure every time I use them. Especially when failure means game over and lights out. Although it is more expensive, the advantage I found with stainless is that working pressures are much higher than brass (5000 to 6000 psi), don�t rust or corrode, and can be easily obtained such as McMaster. I can�t find any supplier who deals with high-pressure brass 360 (3500 psi and up). If any of you know such supplier, I would greatly appreciate the contact information. The issue of stainless steel not being compatible with hp-O2. I am not sure. Since I have only used stainless steel fittings and valves for years I don�t see any problem with it. Due to stainless steels higher working pressure ratings I think it is safe to use stainless. If O2 flow is controlled at the fill tank side before the fill whip via good quality needle flow control valve along with restrictor valve, I think adiabatic compression could be minimized. I am not suggesting this is right or wrong way. I just wanted to know what larger population is doing. I would appreciate any thoughts in this issue. Thanks! Ken >From: "Bill Johnson" <sigxbill@sc*.co*> >Reply-To: <sigxbill@sc*.co*> >To: <techdiver@aquanaut.com> >Subject: Re: Stainless Steel vs HP O2 >Date: Tue, 31 Oct 2000 11:29:10 -0500 > > >Stainless Steel is less than optimal with HP O2 because the burning >threshold per ASTM G124 for 316 stainless is only 500 psia. Brass 360 on >the other hand has a threshold of >10,000 psia. Given that fill whips, etc >experience much adiabatic compression (one of several great ignition >sources), use brass. > >Regards, > >Bill > > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.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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