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

[hank pronk]

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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