[PSUBS-MAILIST] Hatch Closure Mechanism

[T Novak via Personal_Submersibles]

Just to add a complication to the project, you will need to have the vent accessible by someone on the outside too,  in case the sub has surfaced but the operator is incapacitated.

Tim

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Alan via Personal_Submersibles
Sent: Saturday, December 30, 2017 12:51 PM
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] Hatch Closure Mechanism

 

Thanks Hank,

will have to think on this one. I want to let a novice dive my sub, so

the system needs to be bullet proof.

If I have some sort of lock mechanism I would need to be able to bypass

it if I needed to escape at depth. The pressure at depth would be apposing 

the manual operation of the overpressure valve. You could flood the sub first

but normally the hatch is un-dogged prior to the hull equalizing.

Cheers Alan

 



Sent from my iPad


On 31/12/2017, at 1:49 AM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote:

Alan,

You could have a lock that prevents the hatch mechanism from opening that is activated by turning the hatch vent.  I always vent before I one the hatch anyways.

Hank

 

On Friday, December 29, 2017, 11:09:03 PM MST, Alan via Personal_Submersibles <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org> > wrote: 

 

 

Just doing some evening reading of the GL rules & noticed this rule about hatches....

"the closing mechanism is to be designed in such a way that opening of

the hatch is only possible after pressure equalisation" 

I am wondering what options there are for achieving this.

Has anyone had experience of the hatch opening with explosive force due

to internal over-pressure not being equalised.

Alan 

 

Sent from my iPad

 

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