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Re: [PSUBS-MAILIST] Request identification of pressure air tanks.
minimum temp for use at 4000 psi is 4 degrees Fahrenheit
It is working pressure not test. The Test pressure, and safety factor (and
thus destruction pressure) depends on what they were manufactured for and
thus what section of the code they fall under. Also intended service would
affect the corrosion allowance and thus have a great impact on the safety
factor. 4000 would be very conservative though.
Be careful what NPT fitting you get. Most are only 160 psi. You can get
5000, 7500, & 10,000 psi ones though.
Jay.
Warren Greenway
<opensourcesub@yahoo.com> To: personal_submersibles@psubs.org
Sent by: cc:
owner-personal_submersible Subject: Re: [PSUBS-MAILIST] Request identification of pressure air tanks.
s@psubs.org
24/10/2003 09:20 AM
Please respond to
personal_submersibles
I wouldn't worry about them being foreign tanks as
long as they are from the US or UK. The first set of
markings tells the maximum pressure, including a small
safety margin, at a given temperature. MOWT isn't on
the tanks I've seen. The other markings are
manufacturer numbers for tracking the tank. They
include date and sequential number. What size is the
thread? They usually have a 1/2" or 3/4" NPT on USA
tanks of that size for drainage. An NPT plug or valve
generally seals the hole. You should be able to buy
any
pipe/valve/plugs/adapters you might need from
www.mcmaster.com
Warren.
--- Carsten Standfuss <MerlinSub@t-online.de> wrote:
> Hi submadmans - I have a request.
>
> I can purchase two douzend units of second hand
> pressure air or gas
> storage tanks from a scrap place - and they look
> like new. Unfortunatly
> the are from foreign country - probably England or
> US.
>
> They have the size of our 50 Liter tanks and labeled
> as :
>
> MAW 4000 PSI APP 220 F/3 AT 200°
> MOWT 4° AT 4000 PSI
> MAN FR N ° 4842/2/28/98
> build 1998
>
> The have one valve on the top and a tread hole on
> the bottom.
>
> I realize that 4000 PSI is about 275 atmosphere
> (bar) but is this the
> work, test or destroy pressure ? What means all the
> other marks ?
> The tread hole to drainage (?) the bottles is very
> unusual here - is
> there a standard plug available ? Any help welcome.
>
> We have the first snow of the year today here and I
> make a quick picture
> of my sub. It should be at the Moki files.
> http://www.prismnet.com/~moki/subfiles.html
>
> Best regards Carsten
>
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