[PSUBS-MAILIST] Fwd: G.L. summary Pressure Hull

[Alan]

Sending the message below, again.
I didn't receive it, sorry if I'm dubbling up.
> 
> Joe,
> I was thinking it may be something like a cable attached to
> the latching handle, so that when you pulled down on the handle
> It opened the pressure relief valve. There would need to be a 
> spring inserted in the length of cable.
> Alan
> 
> Sent from my iPad
> 
> On 12/12/2013, at 3:53 AM, Joe Perkel <josephperkel at yahoo.com> wrote:
> 
>> 
>> Alan
>> 
>> No definitive answer but we can postulate that both sensing and actuation are involved. 
>> 
>> On sensing, differential pressure on either side of the hatch is translated to a impulse to actuation.
>> 
>> On actuation, a method of locking out the operator from physically un-dogging the hatch, is the only way to meet the standard as per your O.P.
>> 
>> Joe
>> 
>> Sent from Yahoo Mail for iPad
>> 
>> From: hank pronk <hanker_20032000 at yahoo.ca>; 
>> To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
>> Subject: Re: [PSUBS-MAILIST] G.L. summary Pressure Hull 
>> Sent: Wed, Dec 11, 2013 2:36:26 PM 
>> 
>> Alan,
>> Is this equalization from overpressure inside the hull? or external pressure.  
>> Hank 
>> 
>> 
>> On Wednesday, December 11, 2013 1:23:21 AM, Alan <alanlindsayjames at yahoo.com> wrote:
>> Can anyone enlighten me on what sought of mechanism
>> is used that renders the opening of the hatch possible only after
>> equalisation, as per G.L. Requirements?
>> Thanks
>> Alan
>> 
>> Sent from my iPad
>> 
>> On 11/12/2013, at 3:01 PM, Alan James <alanlindsayjames at yahoo.com> wrote:
>> 
>>> Hi,
>>> I'm not covering much in this section because if I started on construction
>>> regulations, I would just be duplicating what was printed.
>>> G.L. wants you to have manufacturer certificates for every non structural screw.
>>> Any company you contract to do your welding has to have their facilities, personal
>>> & supervision approved by G.L..
>>> Some points of interest are.... hatches need to be opened from both sides, they need
>>> to be able to be secured open, they need to be designed in a way that opening of the
>>> hatch is only possible after equalization. Two measures are required to guarantee that
>>> the hatches are closed & secured before diving; one measure is to be visibly noticeable.
>>> Mechanical measures for stopping a banging of the hatch is required.
>>> Any external through hulls are to be protected against damage by appendages or covers.
>>> If you are doing calculations on a computer you have to prove that the program is suitable.
>>> Alan
>>> _______________________________________________
>>> Personal_Submersibles mailing list
>>> Personal_Submersibles at psubs.org
>>> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>> 
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>> 
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