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Re: [PSUBS-MAILIST] Pipe System Confirmation.
James, SCUBA regulators employ a pinhole orifice in the first stage
upstream of the HP port(s), in order to prevent the catastrophic loss of
breathing gas in the event of a pressure gauge or HP hose / fitting
failure, since the only purpose of HP in a SC system is to allow
pressure monitoring. The available flow is minimal unless you
purposefully modify the regulator to create a larger flow path.
Sean
On 2012-03-13 10:40, James Frankland wrote:
Hi All.
1. Does everyone else keep getting spam messages from Scott Waters?
2. I have finalised my HP air system. Ive probably made a meal out
of something relativly simple but i havent ever built a HP system like
this before so have had to figure it all out.
The system will be designed to route as per K350 design but use
swagelok fittings and run at higher pressure. The system is designed
to opperate at a max pressure of 1000 psi but will run normally at
lower. Most of the system will be 1/4 inch pipe, with just the
variable tank inlet\vent part 1/2 Inch.
The limitation on the design is the worcester ptfe sealed ball valves
which have a maximum working pressure of 1000psi (69bar).
I have 2 last questions.
1. I have decided to use worchester ball valves (466TSE ptfe sealed)
instead of the diaphragm valves or even needle valves. Do you think
this will be ok?
2. Does anyone have any suggestions for the thickness for my 300bar
manifold.
I am going to make a 4300psi (300bar) stainless manifold to accept the
tanks.
The manifold will have 2 x standard scuba quick release high pressure
hose fittings. Like you would use for a BCD or gauge off your 1st
stage. This means i can run 2 tanks to the system but be able to get
them on and off easily and quickly.
There will be a 300 bar gauge attached to the top of the manifold to
measure manifold inlet pressure, a manual relief valve off another
port and then the outlet which will go to a 300bar - 70bar pressure
reducing regulator with inline gauge to measure system pressure.
Emile says that the HP port on a normal 1st stage does not give a lot
of flow, so i am going to just run it and see if its enough. If not,
i can pipe the manifold directly to the tanks.
The idea with this is that 1, the 2 x tanks can come off easily and 2,
i have adjustable high pressure outlet.
Sorry, after all that, the question is. Any suggestions for thickness
of the manifold to hold at 300 bar? I think i might go to my local
dive shop and measure the thickness of their filling station
manifolds. hmm, good idea.
Thanks as always,
regards
James
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