Re: [PSUBS-MAILIST] Perry lockout

Vance, I see I got a little confused with your quote of "All the Perry boats had dual hatches with two pivoting dogs (tapered)." I'm not visualizing that statement into mechanical form. Some times a little smack on the back of the head will do the trick with me. :)' Coffee cup lock, I like that. I'm familiar with medical locks since I worked on one for my Great Uncles 2 ATM hyperbaric chamber. Here is a pic of the inside medical lock door on his chamber before it was finished. There are four temporary white clamps holding the door shut.

http://www.frappr.com/?a=viewphoto&id=2384531&pid=3826538&myphotos=1

Yes I know that door is serious over kill for a 2 ATM chamber but if you knew my Great Uncle Clyde you would understand. If a 2"x 6" stud would do he would use a 6" X 12" beam. Here is a pic of the outside of the chamber, showing the outside of the medical lock, but before the outside door was installed. I would of used a outward opening locking ring hatch for this door.

http://www.frappr.com/?a=viewphoto&id=2384531&pid=3826537

My thoughts on the need for hyperbaric chambers to decompress divers is a little different. I would like my DLO to be the decompression chamber. If it's designed to take the internal pressure when the sub is at the surface, and it has a coffee cup lock, as well as controls in the crew compartment for a doctor or other to operate, you could treat a diver with out a regular on board chamber or if you don't even have a support ship at all. I was also thinking about making the crew area be able to withstand the same internal pressure that the DLO can handle, and so you could use it as a transfer lock. That of course requires design changes in the exit hatches into LRH's, view ports, electronics, etc., etc..

I had at least wanted the crew area to be able to be a 2 ATM hyperbaric chamber for general health reasons, but a higher PSI rating would require allot more thought. If the DLO is in the bow of my submarine, much like in the Euronaut, then I was thinking that the whole bow section which is mostly the DLO could be designed to release from the main sub hull and act as an escape pod in case of a serious problem(s) with the rest of the boat. Also if hatches in the DLO could be placed in the port and starboard walls, as well as the ceiling that you could escape the DLO as a diver regardless of how the sub lay on the bottom of the ocean, lake, or river. That's if your not to deep of course. Better yet if the top hatch in the ceiling is able to receive a international locking skirt from a DSRV or a PSUB of your own making, you could escape the DLO dry as well as use the set-up as a transfer chamber if the smaller PSUB was designed to take that amount of internal pressure.

What can I say, I'm a submarine half full of the good smoke, kind of guy.

Regards Brent

From: vbra676539@aol.com
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Perry lockout
Date: Sat, 27 Jan 2007 08:51:11 -0500

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.

Vance

-----Original Message-----
From: brenthartwig@hotmail.com
To: personal_submersibles@psubs.org
Sent: Sat, 27 Jan 2007 3:27 AM
Subject: Re: [PSUBS-MAILIST] Perry lockout

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

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