Re: [PSUBS-MAILIST] Design depth

[JimToddPsub@aol.com]

Jon,

 

Correct me if I'm wrong, but I think we're talking about two different things, one of which I did not reference.  I was referring to sea tests of a manned vessel when I referred to the US navy standard of 2/3 of design depth.

 

I think you were referring to the hull pressure test (unmanned) which often is conducted in a pressure chamber.  It's been a couple of months since I've reviewed that and I'm now a bit fuzzy on it.  At that time I was able to locate several facilities with the capability to test my hull including measuring compression.  I also took a cursory look at the effect of temperature on the hull.

 

Thanks for the correction.

 

Jim

 

In a message dated 12/9/2010 10:16:30 P.M. Central Standard Time, jonw@psubs.org writes:

Jim,

I recommend you target 600 feet as your test depth, assuming you have such water depth available to you.  If you test to 400 feet, that would become your "rated" depth and you would still want to impose a safety margin.  If you assigned a safety margin of 2x for the rated depth it would put your maximum operating depth at 200 feet.

Jon


On 12/9/2010 10:42 PM, JimToddPsub@aol.com wrote:

Hi, Alan,

 

In my mind I had picked up "design to twice the operating depth." I plan to test to 2/3 of the design depth (US Navy standard) which is the same thing as 133% of the operating depth.  Therefore:

 

Operating Depth    300'

Test Depth            400'

Design Depth        600'

 

Those numbers might change slightly during the design process, but the proportional relationships should stay the same.