[PSUBS-MAILIST] cabin pressure

[hank pronk via Personal_Submersibles]

 Brian,I used to have a hatch leak before I fixed the problem, it was more annoying than anything.  I would be real surprised if yours leaks based on your design.   Hank
    On Tuesday, April 3, 2018, 8:48:50 PM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  
 
 Hi All,          I did an experiment today with my hatch because I'm trying to get a handle on the sealing capability of my hatch.  My hatch dogs are on a wheel that I turn to secure them, they are only a friction progressive seal, where the dogs push the hatch down tight from the underneath the rim of the hatch rim.  I'm concerned that if I were lingering right at where the water level meets the hatch ring that there might not be enough pressure to seal and I would have a leak.  I also wanted to see my cabin pressure gauge move as well so I brought a scuba tank inside the cabin to build up pressure inside.  I used some ratchet straps to secure the hatch from the inside and was able to build up some positive pressure inside the cabin.  Then I tried just holding onto the hatch closure wheel with my weight to see if I could get a pressure increase that way, which I did.  Do you experienced submariners ever have an initial leak at the hatch before there is sufficient pressure to seal?  It would be nice to do a negative pressure like Nuytco does but I can't figure out how to do that while I'm inside the sub. Brian   _______________________________________________
Personal_Submersibles mailing list
Personal_Submersibles at psubs.org
http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20180404/5bb259a3/attachment.html>