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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.
Jim
In a message dated 12/9/2010 8:13:19 P.M. Central Standard Time,
alanjames@xtra.co.nz writes:
Hi Jim,
I remembered the discussion but forgot the details.
I used to hear all the time on Psubs that you test your sub to
twice your maximum
operating depth, unmanned, for an hour. This might not be a bad rule for
home builders
who aren't going through a certification inspection process; & may be
using blown domes
with their inherent stresses & weaknesses. Also there is the aging
process that must weaken
the hull, that should be accounted for. I'm still looking at making my
hull out of
fiberglass & there's a bigger margin of error required for that
material.
Alan
----- Original Message -----
Sent: Friday, December 10, 2010 12:31
PM
Subject: Re: [PSUBS-MAILIST] Design
depth
Alan,
My design depth is 600 ft. Operating depth is 300
ft. Therefore required test depth would be 375 ft. Failure depth
must be slightly deeper than 600 ft.
What test depth would you consider to be best based on the
above? I would have thought 400 ft. which isn't much more than
the standard. We had an online discussion of this in early
October. I'll forward my last post which includes the comments of
others.
Thanks,
Jim
In a message dated 12/9/2010 2:45:05 P.M. Central Standard Time,
alanjames@xtra.co.nz writes:
Thanks,
that's a lot smaller margin than I thought, or would
be happy with myself.
Alan
----- Original Message -----
From:
"Jon Wallace" <jonw@psubs.org>
To:
<personal_submersibles@psubs.org>
Sent: Friday, December 10, 2010
2:25 AM
Subject: Re: [PSUBS-MAILIST] Design depth
>
> I believe for certification ABS requires the sub to be tested to
25%
> above its maximum operating depth. So if your max op
depth is 100 feet
> they would require it to pass testing at 125
feet.
>
> On 12/9/2010 2:44 AM, Alan James wrote:
>>
Does ABS or ASME state what your operational depth should be in
>> relation to your crush depth?
>> & if so is this
different for the view ports.
>> I've read with fiberglass there
is a 4x safety factor where human life
>> is
concerned.
>> Alan
>
>
>
>
>
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