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RE: [PSUBS-MAILIST] Flooded Stability.
Hi Jon, That 11.100 was only a test rig that he did to arrive at STCP for domes not what he recommended. OK if you have plenty of room. Yes to that for the working load of the bolts but you are best to determine what bolts you are going to use. SS or Monel or Titanium or such. Then look up the UTS (ultimate tensile) or get from the supplier. Then you use the minor diameter to get the bolt area under stress.
And should be able to work it out.
If you need any extra I can send you an excel sheet.
Regards,
Hugh
-----Original Message-----
From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Jon Wallace
Sent: Monday, 29 March 2010 2:29 p.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Flooded Stability.
Hugh,
Thanks for the reference. I also see that in Stachiw Figure 11.100 it
shows 1/2 inch bolts. In regards to the safety factor for the bolts,
how is that calculated? Is it determined by calculating the total area
pressure on the spherical segment, dividing by total number of bolts and
then multiplying by 4?
Jon
Hugh Fulton wrote:
> Jon, I did not find any reference to it in PVHO or ABS but it was in Stachiw p452 11.2.4.2 Attachment. The minimum internal design pressure for windows retaining rings is 5 psig PVHO-1 2-2.11.6 and bolts safety factor of 4 using UTS. Regards, Hugh
>
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