[PSUBS-MAILIST] Viewports - steel or stainless

[Sean T. Stevenson via Personal_Submersibles]

https://parts.cat.com/wcs-static/pdfs/PEHJ0264.pdf

Sean


On August 6, 2015 9:27:10 AM CDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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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