Hydraulic Collapse Pressure (aka crush depth)
Hydraulic Collapse Pressure (aka crush depth)
(OP)
I am trying to design some enclosures for equipment I intend to locate on or near the sea floor at a depth of about 1300 feet. I need to figure out how best to design these enclosures so that they do not implode due the the high ambient pressure. My question is, is there a good reference on the internet, or in a book where this type of design information could be found. Thanks.
Oceanman
Oceanman





RE: Hydraulic Collapse Pressure (aka crush depth)
RE: Hydraulic Collapse Pressure (aka crush depth)
RE: Hydraulic Collapse Pressure (aka crush depth)
IHS has it in their online spec service too [ http://www.ihserc.com/ expensive, but worth it if you need a lot of MIL specs or ASME specs]
RE: Hydraulic Collapse Pressure (aka crush depth)
RE: Hydraulic Collapse Pressure (aka crush depth)
RE: Hydraulic Collapse Pressure (aka crush depth)
RE: Hydraulic Collapse Pressure (aka crush depth)
RE: Hydraulic Collapse Pressure (aka crush depth)
nothing in your note on the radius you are looking at? Are you sure you want to go for a ring stiffened cylinder?
The section in BS5500 applicable to external pressure is about 20 pages (based on Bill Kendricks work at ARE/NCRE) search for Kendrick and you should get something pretty quick. There is an option of using empirical design curves for pc1-7 etc or you can do the calcs and see what you get by analysis Bresse/Bryant.... There are also (though somewhat dated) some Class society rules for submersibles LR and ABS, may be others. Classically there is interframe buckling and overall collapse and you need to anlyse up to at least mode six. Current thinking is that there is no dicretisation between IF and overall but that the two interact.
At the end of the day i would say that how much you want to spend on the design is liable to drive you. If the application is going to be static then make it simple and use a large gammaI and gammaC on both the cylinder and domes.
RE: Hydraulic Collapse Pressure (aka crush depth)
Oceanman
RE: Hydraulic Collapse Pressure (aka crush depth)
Can you completely fill the enclosure with a dielectric liquid? This might allow you to simplify the design. If there is no pressure differential between the inside and the outside of the enclosure the structural loads are much less and leakage is less of a problem as well.
If this is impractical, look into using FEA tools to do a buckling analysis as has already been mentioned.
Sounds like fun
Colin
RE: Hydraulic Collapse Pressure (aka crush depth)
Oceanman