[PSUBS-MAILIST] Viewports - steel or stainless

Thu Aug 6 12:07:58 EDT 2015

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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