|
I just checked with a guy who works on regulators for a
living where I live and has all the bells and whistles for testing and he said
that most 1st stage regs are set to around 140 psi over bottom and and you
go deeper, that number increases a bit. I am building a K-350 and was dealing
with having to use HP air to blow the tanks at max depth but found out that the
1st stage always adjusts to 140 PSI over bottom + -. (this only applies if
the 1st stage is outside the sub)
Rick
Sent: Wednesday, December 28, 2011 7:05 AM
Subject: Re: [PSUBS-MAILIST] Msg For Dan H
hmm, ok. Good idea. Should be easy
enough to do. I'll dump it into a water test tank as well for extra safety
and hide out of the way. I'll test it as soon as the piping arrives.
Strange that George only calls for 150psi
pressure. I thought it was higher than that. Thats only just
enough to blow mains at full diving depth. Oh well, mine will be
3000psi.
James
I'd fill
that tank with water and test it to 125% or so (at a
distance, mind you). It's probably plenty strong enough, but better to know in
advance.
Vance
Sent: Wed, Dec 28, 2011 6:03 am Subject: Re: [PSUBS-MAILIST]
Msg For Dan H
Hi Vance,
Yes, understood. They have a chart at Swagelok that tells you what
wall thickness to use for the OD of the pipe and the pressure you want.
i have the standard VBT design, i was going to use 1/2" SS tube for that
part as per the plans (as its the vent as well) but at the correct thickness
for 3000psi. Then use thinner piping for the rest of it, again at the
correct thickness for 3000psi. Do you think that wont work now?
The through hull to the tank is sched 80, tank is as standard but with sched
80 air inlet pipe.
Thanks
James
On 28 December 2011 15:37, <vbra676539@aol.com> wrote:
James,
The original Kittredge design called for 135-150 psi
system pressure and used 3/8" and 1/2" tubing to account for lower flow
rates. If you are using a high pressure system, 1/4" SS tubing will do
nicely. That said, you can't mix and match. Captain K's copper tubing system
and VBT design are not strong enough for 3000 psi.
Vance
-----Original
Message----- From: James Frankland < jamesf@guernseysubmarine.com> To:
personal_submersibles < personal_submersibles@psubs.org> Sent: Wed, Dec 28,
2011 5:28 am Subject: [PSUBS-MAILIST] Msg For Dan H
Hi Dan,
Couldnt find your email so had to send this to the whole group.
Can you tell me what size piping you used for the HP air. The
smaller diameter one. Looks like 3/8ths as per the plans? With
0.032 wall?
Many thanks
James
|