[PSUBS-MAILIST] Pressure Test

[Alan via Personal_Submersibles]

Thanks Hank,
the silicone mold fits over the wire & clamps down on to the back
for pouring, & not much will stick to the silicone. For the through
hull end I'll need to split the mold.
Alan

Sent from my iPad

> On 26/06/2017, at 11:48 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 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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