[PSUBS-MAILIST] Pressure Test

[james cottrell via Personal_Submersibles]

Hank,
Do you know if EE can fabricate your hull from EN26 steel? The hull that Ron A. had fabricated was only 2.5" thick and went full ocean depth with plenty of safety factor. Using the same grade steel in a thickness designed for only 13,000 ft might save a lot of weight.
Greg C

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Monday, June 26, 2017 7:54 AM
 Subject: Re: [PSUBS-MAILIST] Pressure Test
   
Alan,That really turned out nice, how did you mould the polyurethane? that stuff sticks like mad. I would leave the white gasket, it looks fine.  Either the gasket thickness is not even or the seat is not perfectly matched to the Lenz. 

    On Sunday, June 25, 2017 10:30 PM, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
 

 Pressure tested my light to 1000 psi for an hour using the water blaster 
& no leaks! I didn't have a pressure relief valve in the system as I do with
my air pressure set up & it was a pain getting the chamber lid off. I had
thought the water blaster would have leaked a bit of pressure but it didn't.
The sealing system for the wires was a 3 layered process; encapsulating the
wires in the epoxy, then coating the insulation for an inch up from where they came 
out of  the epoxy, & over the epoxy with a 2 part heat activated pvc glue that 
they use on inflatable boats. This glue worked a lot better on the pvc insulation
than several others I tried like E61000 (supposed to be better than shoe goo),
3M 5200 & polyurethane.
Over this, to tidy it up & act as a cable support, I moulded polyurethane.
In the attached photos the white ptfe gasket that the lens sits on looks wet
but it is just the compression of the lens against the gasket. I don't like this
from a cosmetic point & may change it. The 2 objects with the light are the
male mould for the polyurethane cable support & the silicone mould for the 
same.
Alan


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