[PSUBS-MAILIST] Viewports - steel or stainless

[André Eriksen via Personal_Submersibles]

Vance,

Thank you very much for a good answer! I can now order steel for the
viewports with peace in my mind.

Have a good one! :-)

Best Regards
André

2015-08-06 18:07 GMT+02:00 via Personal_Submersibles <
personal_submersibles at psubs.org>:

> Not to be confused with vacuum grease, which we used as the lubricant on
> viewports and supporting mating surfaces. That's the stuff that is designed
> to help seal pressure and/or vacuum systems. Dow Corning makes it, among
> others.
> Vance
>
>
> -----Original Message-----
> From: via Personal_Submersibles <personal_submersibles at psubs.org>
> To: personal_submersibles <personal_submersibles at psubs.org>
> Sent: Thu, Aug 6, 2015 11:47 am
> Subject: Re: [PSUBS-MAILIST] Viewports - steel or stainless
>
>
> We used to use a synthetic based product with inorganic thickeners that
> had good temperature and high pressure resistance. It resists water washout
> and provides excellent rust protection. Looking today on the net, I think
> maybe Crystal Blue Grease might be the stuff. It was blue, true enough. And
> about forty bucks a pound back in the day. But man, does it work!
> Vance
>
> -----Original Message-----
> From: Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org>
>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Sent: Thu, Aug 6, 2015 10:27 am
> Subject: Re: [PSUBS-MAILIST] Viewports - steel or stainless
>
> Hi Vance,
>                       I assumed all grease was non-soluble ,  where would
> one find this type of grease?
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: via Personal_Submersibles < personal_submersibles at psubs.org>
> To: personal_submersibles at psubs.org
> Subject: Re: [PSUBS-MAILIST] Viewports - steel or stainless
> Date: Thu, 6 Aug 2015 07:38:11 -0400
>
> Andre,
> Steel will be fine with the maintenance you suggest. Be sure to use a
> non-soluble grease. And the good news is that SS bolts won't gall as a rule
> in high carbon steel. As proof, I offer the Perry subs, which have without
> a doubt done more dives in salt water than all other submersibles put
> together. And every one of them has hull matched steel inserts for viewport
> and penetration plates. We painted everything, sanded the mating surfaces
> smooth, and went on about our business. No problem. Even those shiny hatch
> mating surfaces you see in the pictures or Perry boats are A537 or A516Gr70
> steel with monel cladding, rather than the softer and more damage prone
> stainless. Plus, stainless can have stress corrosion problems in oxygen
> starved atmospheres, and takes a lot of experience to use effectively.
> Vance
>
>
> -----Original Message-----
> From: André Eriksen via Personal_Submersibles <
> personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion <
> personal_submersibles at psubs.org>
> Sent: Thu, Aug 6, 2015 6:27 am
> Subject: [PSUBS-MAILIST] Viewports - steel or stainless
>
> Hi,
>
> Is steel or stainless mostly used for viewports?
> Have you had any problems with rust in the threads when using steel and
> diving in saltwater?
>
> I would imagine filling the threads with grease, and inspecting them on a
> regular basis should be fine.
>
> Was hoping I could go with steel, as I can get them cut out from the same
> plate as the frontdome seat.
>
>
> Thanks,
> André
>
>
>
>
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-- 
Med Vennlig Hilsen / Regards
*André Eriksen*
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