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

[Jon Wallace]

Jim,

Yes, there's certainly a point in all brackets where it would behoove 
the owner to bump up the nominal dive depth (operating depth) to take 
advantage of lower ratios.  I believe ABS uses a static 1.25 ratio for 
all vessels regardless of operating depth. GL would appear to be more 
conservative than ABS in this category.

Jon


On 12/6/2013 6:03 AM, jimtoddpsub at aol.com wrote:
> 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
>

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