RE: [PSUBS-MAILIST] Valve Advice

I agree that needle valves are standard fare with Oxygen but I am interested to know if there are any standards or legislation, references to this in ABS rules, G/L etc. Can anyone point me to chapter and verse in this matter.

Perhaps this could be put into the safety recommendations on the P-subs technical notes. Hugh

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Smyth, Alec
Sent: Thursday, 5 January 2012 8:34 a.m.
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Valve Advice

I agree with Vance, if I had ball valves for blowing the MBTs, where I have the needle valves now, it would probably work just fine. The one case in which you can't use a ball valve, however, is with HP oxygen. Even the hull shutoff for O2 has to be a needle valve. The reason is that a ball valve starts and stops the flow quite suddenly, and the pressure bang can trigger an oxygen fire.

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of vbra676539@aol.com
Sent: Wednesday, January 04, 2012 1:14 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Valve Advice

We used ball valves throughout, save for cabin oxygen. You can control flow quite easily with a ball valve (for the MBTs, for instance) and the good news is that you will have a smaller inventory of spares to deal with. Same with my subs at home. Whitey ball valves. Rebuildable and, in any case, virtually indestructible.

Vance

-----Original Message-----
From: Smyth, Alec <Alec.Smyth@compuware.com>
To: personal_submersibles <personal_submersibles@psubs.org>
Sent: Wed, Jan 4, 2012 7:27 am
Subject: RE: [PSUBS-MAILIST] Valve Advice

Hi James,

I use 1/4" Swagelok valves for the HP lines. Ball valves for the hull stops, needle valves for control.

Thanks,

Alec

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From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of James Frankland
Sent: Wednesday, January 04, 2012 12:17 PM
To: personal_submersibles@psubs.org; member-forum@psubs.org
Subject: [PSUBS-MAILIST] Valve Advice

Hi All,

Does anyone have any advice as to what type of valves i should use for the high pressure air control?

I have all my hull stop valves and vent valves sorted, these are just the last few. Plans call for Diaphragm valves.

But, my system will be 3000psi, not the 150 ish George used.

I believe Alec uses needle valves?

Im not sure what to get. Needle? Diaphragm? Ball?

The system is going to be more or less as per the plans but 3000psi and with double tanks fitted.

Any advice as to what other people have used much appreciated.

Kind Regards

James

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