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

[Alan]

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
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> 
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