[PSUBS-MAILIST] hatch pin

[Sean T. Stevenson via Personal_Submersibles]

Well, I guess technically that's "means for securing"...

Sean


On March 23, 2016 10:35:05 AM MDT, Brian Cox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>I seem to remember in some of those old WWII movies ( run silent, run
>deep) where the are diving ( dive, dive) and they have a line on the
>inside of the hatch that one guy is hanging on, to hold it down,,
>presumably until pressure builds up on the outside so it is secured by
>the pressure alone.  Then maybe they worry about securing the hatch
>dogs .   Of course they were in a bit of a panic in those situations .
>
> 
>
>Brian 
>
>--- personal_submersibles at psubs.org wrote:
>
>From: "Sean T. Stevenson via Personal_Submersibles"
><personal_submersibles at psubs.org>
>To: Personal Submersibles General Discussion
><personal_submersibles at psubs.org>
>Subject: Re: [PSUBS-MAILIST] hatch pin
>Date: Tue, 22 Mar 2016 22:49:59 -0600
>
>I know that this particular rule is often voluntarily disregarded by
>hobbyists, but just FYI:
>
>ABS Rules for Building and Classing Underwater Vehicles, Systems and
>Hyperbaric Facilities (2016)
>Section 11 (Submersibles)
>Subsection 5 (Access Hatches)
>
>5.3 (Operation):
>
>"All hatches are to be operable from both internal and external sides. 
>Hatches should be designed to seat with pressure.  Hatches that unseat
>with pressure will be considered based on the application of the unit. 
>The means for opening and closing of hatches should permit operation by
>a single person under all anticipated operating and emergency
>conditions.  Hatches are to have means for securing in the open and
>closed positions.  Means are to be available to ensure that hatches are
>clear of water before opening.  All hatches are to be considered when
>evaluating the surface stability of the submersible.  See subsection
>11/31."
>
>5.5 (Pressure Equalization):
>
>"Means are to be provided for equalizing pressure on each side of a
>hatch prior to hatch opening.  As an alternative, an absolute pressure
>indicator with means of adjusting the internal pressure on either side
>may be provided."
>
>
>Technically, to be in compliance you need to be able to cinch it down
>from the outside too.  Gets to be a complicated mechanism though.
>
>Sean
>
>
>On 2016-03-22 22:07, Brian Cox via Personal_Submersibles wrote:
>
>Hank, can you cinch it down from the inside ,  obviously you would have
>to be inside at the time, but you might be able to determine if it is
>where you want it.
>
> 
>
>Brian
>
>
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>
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