[PSUBS-MAILIST] Tap instead of weld

[james cottrell via Personal_Submersibles]

Jon, 
Crack propagation might be a problem with a threaded hole in a pressure hull but I think you could use a tapered insert with no problem as long as the insert were strong enough to compensate for the hole. Poly-carbonate inserts have been approved as a repair plug for acrylic hulls and it is basically the same idea.
Greg

      From: Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, August 18, 2017 9:51 AM
 Subject: [PSUBS-MAILIST] Tap instead of weld
   

On a thicker hull, installing a small penetrator (1/4 male NPT), is 
there any structural reason why one could not just drill a tap such a 
fitting instead of welding it?


Jon

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