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Into the 4th test session now, tested down to 50 feet, no leaks. Seal compression and bolt loosening has not been an issue yet. First victim has been a video camera.

True. I'm used to internal pressures, seeing compressed gaskets, got to get that out of my head. But, I also don't want further compression of the seal from the water pressure to let the bolts get loose, since the bolts will also be used to attach handles, legs, lights etc. I think there's...

Initial test in the sink OK, no leaks. Must experiment next with bolt preload, gasket material doesn't compress that easily. I tightened the bolts until the gaskets were visibly compressed, which bent the corners of the end caps. Might not need that much pressure. Ends of the hull cylinder...

An update: I've got all the materials cut and ready for assembly and testing. Changed the end caps to hexagonal and put stainless rods through each corner, still using 1/2" Lexan. Gasket will be .070 neoprene, the 1/4" one was unneccessarily thick. The 1/4" wall, 6" OD cast acrylic tube for...

Yes, I'm looking at cast acrylic tube with a 1/4" wall. No doubt stronger and clear too. Thanks for your input.

Sure, see what you think. The end caps will be 1/2" lexan, 6 1/4" square. The body will be 6" OD plastic drain pipe, 1/8" wall thickness, 7" long. I was planning on cutting the sealing washer myself out of 1/4" neoprene, 50 duro. The bolts go through the corners of the lexan, end cap to end...

OK. So I'm basically limited by the strength of the materials, ie crush depth. Either way, I'll still need a good bit of testing before I put anything expensive inside of it.

The water pressure at 100 feet is 58 lbs/sq in. So why wouldn't I match that pressure with the pressure the bolts put on the seal. The seal bearing area between the cylinder (1/4 in wall thickness) and end cap is about 4.7 sq in. Multiplied by 58 and that's 272 lbs. So I torque the bolts to...

We'll be diving to a max of 100 feet, so I believe that's around 45 lbs/sq in.

I'm building an enclosure for some electronic equipment to take it underwater. Nothing complicated, a 6" cylinder with flat end caps bolted over a neoprene gasket. Is there any rule for calculating the the amount of clamping force needed on the enclosure seals to keep out the water? For...