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Re: [PSUBS-MAILIST] Design depth
Just to expand on the test depth a little.
600m unmanned test depth.
375m manned test depth.
Or:
Operational depth = X
Unmanned test depth = 2 * X
Manned test depth = 1.25 * X
-----Original Message-----
>From: irox <irox@ix.netcom.com>
>Sent: Dec 10, 2010 12:50 PM
>To: personal_submersibles@psubs.org, personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] Design depth
>
>
>Just for another data point, mine:
>
>Predicted hull failure depth: 3400m
>Planned Operational depth: 300m
>Planned test depth: 600m
>
>This is of course subject to change, the two biggest factors
>being out of round of the hull and funds available for tests.
>I could potentially save a lot of money by halving the
>operational depth.
>
>Ian.
>
>
>-----Original Message-----
>
>From: JimToddPsub@aol.com
>
>Sent: Dec 9, 2010 7:42 PM
>
>To: personal_submersibles@psubs.org
>
>Subject: Re: [PSUBS-MAILIST] Design depth
>
>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 -----
> From:
> JimToddPsub@aol.com
> To: personal_submersibles@psubs.org
>
> 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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