Re: [PSUBS-MAILIST] Flooded Stability.

[Jon Wallace <jonw@psubs.org>]

Hugh,

Do you have a reference to the ABS language?  I haven't looked at them 
in a couple months but I thought the relief valve was for equalizing 
pressure manually similar to what we had to do with DeepWorker when we 
came back to the surface, and not that there was some automatic relief 
valve at a specific pressure level.  While a hatch could certainly "pop" 
with enough differential pressure internally/externally when it was 
opened, it's hard for me to imagine how a hatch would pop on its own 
upon surfacing if it is properly secured.

Jon



Hugh Fulton wrote:
> I was just reading the ABS rules and it says that if you have a 
> cylinder of air or oxy inside that if it is totally released the 
> internal pressure should not be greater than 15 psi.  Also if you had 
> an air leak then the internal pressure could rise so that when you hit 
> the surface the hatch could pop before you vent the MBTs.  You also 
> have to have a relief valve with an isolating valve wired open.  What 
> do you set the relief valve at.  Also the name plate on the vessel 
> must show maximum external pressure and maximum internal pressure.  
> This would also be required to determine the number of bolts holding 
> the viewports in.  Hugh




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