[PSUBS-MAILIST] Viewports - steel or stainless

[via Personal_Submersibles]

Andre,
One more thing. As an old shop rat, I will tell you that the biggest enemy of a good paint job is the sharp edge. Paint will necessarily thin there and on the rough spots and you will get rust pretty quickly. Take your time during fabrication. Break all the edges, including the bolt holes. Make sure there is no serious porosity on any weld surfaces. Then sandblast to white metal, clean, clean, clean the surface, and use a good multi-coat paint treatment. These days, probably not vinyl, like we used. But a good zinc undercoat, then high build epoxy topped with polyurethane will make a very tough and long lasting surface.
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 7:40 am
Subject: Re: [PSUBS-MAILIST] Viewports - steel or stainless


 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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