Re: [PSUBS-MAILIST] Perry lockout

Brent, That was the point. Perry didn't use double acting hatches. The DLOs had single lock hatches mounted inboard, one between the DLO and crew compartments, 1 exit hatch on a trunk through the diver ballast tanks and pressure hull, and on 1202, another hatch right aft for access to the motor room (1 atm). External pressure was managed with the hatch on the end of the outside end of the exit/transfer trunk. We had a medical lock which was a tube about 8" in diameter with a hatch on each end to pass small items in and out (better to have called it a coffee cup lock). A TRANSFER LOCK, however, is something else again, and we had them on the ship, not the submarine. The sub mated directly to a transfer trunk, with access to the chambers. The chambers themselves had transfer locks so that a person could lock in (a doctor, for instance, or a replacement diver if someone had to be decomped and brought out). Are you thinking about having this kind of thing onboard your submarine? I've got photos buried at present, but should be able to find you something eventually.

I'm interested in the locking ring hatch (LRH) for a number of different applications. I believe I've come up with a economical way of building my own LRH's. When I get the CAD work done I'll post it. The first item I wish to put a LRH on is a small one person 2 ATM hyperbaric chamber with the hatch opening towards the outside. The second item would be a Kraka sized sub with a diver access hatch that can open into the pressure hull, instead of down and into the water like the one Kraka has currently. The type used on Kraka is easier to manufacture and looks like it works very nicely, but I was just looking at the differences. The bottom access hatch in Carsten's diver lockout (DLO) has a different design then the Russian type I've seen. The pic I've seen of it was when it was not totally finished so I don't know if he added a gear system to rotate the hatch about it's center point by having the gears attached to the hatches head and hinge towards the outer area of the head. It looked like the main hatch area was to be turned by hand, but if that's the case I don't know how they would get a tight seal. Also with that style I would guess that you would need to grease up the O-ring so as the hatch head was rotated into the O-ring it would slide.

The third project I'm designing is a Carstenesque sized sub with a DLO much like what the Euronaut currently has. I don't know what his DLO can handle in the way of internal pressure but it looks very strong. He's using a two hatch system for the DLO between the 1 ATM main crew compartment area and the DLO. I was thinking that if I used the LRH type I wouldn't need the double door set up on my DLO.

Do you have any close up pictures or mechanical drawings of the hatches used on the Perry submersibles? Do you know what amount of pressure can be safely handled on either side of the Perry sub's double action hatch's?

Regards

Brent

From: vbra676539@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Perry lockout
Date: Fri, 26 Jan 2007 21:57:32 -0500

Brent,

I'm not sure why you'd need a double acting hatch between the DLO and a 1 atm. section of the boat. On a military sub, they use that kind of hatch to separate sections of the sub in case of flooding. They will hold from either side, yes, but why would you want that in a psub? Maybe you are thinking Carstenesque in size, a BIG psub, and if so, we're talking apples and oranges here, as I was thinking of a small one. If you have a sub big enough for duplicate controls and flooded your crew compartment, but were able to scramble into the DLO, then you could theoretically surface the boat. The JSLs, for instance, have ballast controls in the DLO, and require a trained tech back there on every dive, so that if the pilot becomes disabled, he can blow the tanks. I'm shooting in the dark here, until I figure out the whys on your design.

Vance

Vance

************************************************************************ ************************************************************************ ************************************************************************ The personal submersibles mailing list complies with the US Federal CAN-SPAM Act of 2003. Your email address appears in our database because either you, or someone you know, requested you receive messages from our organization. If you want to be removed from this mailing list simply click on the link below or send a blank email message to: removeme-personal_submersibles@psubs.org Removal of your email address from this mailing list occurs by an automated process and should be complete within five minutes of our server receiving your request. PSUBS.ORG PO Box 53 Weare, NH 03281 603-529-1100 ************************************************************************ ************************************************************************ ************************************************************************