[PSUBS-MAILIST] G.L. summary Design Loads

[jimtoddpsub at aol.com]

Hi Alan,

If I understand the requirements correctly, then for designed maximum operating depths of 320 feet and the 340 feet respectively the test depths would be as follows:
320' x 1.4 = 448' test depth
340' x 1.25 = 425' test depth

And the designed collapse depths would be:
320' x 2.4 = 768' collapse
340' x 2.0 = 680' collapse

Therefore if my designed operating depth is near the lower limit of a bracket, increasing the stated operating depth enough to push it into a deeper bracket would actually lessen the requirements for test depth and collapse.  Do I understand correctly?

Thanks,
Jim


-----Original Message-----
From: Alan James <alanlindsayjames at yahoo.com>
To: psubs.org <personal_submersibles at psubs.org>
Sent: Thu, Dec 5, 2013 9:27 pm
Subject: [PSUBS-MAILIST] G.L. summary Design Loads



This section is a summary of loads to be considered when
designing your submersible.
A load plan is to be submitted for the pressure hull, external loads
& internal loads. Section 4 F, table 4.2 has a summary of 35 relevant loads 
& the tests required. The tightness tests (leak test by pulling a vacuum) are 
at .2 bar below atmospheric pressure.
The relationship of the nominal diving pressure ( maximum operating depth )
the test pressure & collapse diving pressure, are dependent on the depth 
you build for. For instance, down to a depth of 165 ft the test depth is 1.7
times operating depth, & the designed collapse depth should be 3.2 x the
maximum operating depth. Down to 330 ft it is 1.4 & 2.4 Down to 660 ft it is 
1.25 & 2.
Section 4 F, table 4.2 has a summary of 35 relevant loads & the tests
required. The tightness tests (leak test by pulling a vacuum) are at .2 bar
below atmospheric pressure.
Alan




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