cannister desing

**jmurba** · 26th May 2007, 20:32

Hi all,

after a couple of years spent working on a descent oxymeter to pilot my ccr dolphin I am going to built my own Rebreather....
My problem is that I haven't got a clue of how to design the cannister.....
I'd like to use a cylinder shaped cannister, like an original kiss one.
but how to chose the right, length,height,diameter to make an efficient cannister ?

help (((-:

regards

jean mi

GKAM · 26th May 2007, 20:56

Hi jean mi,

Take a look here: References and you will find some very good USN reference documents on scrubber design.

/GKAM

gibbogeo · 26th May 2007, 23:18

Quote: (Originally Posted by jmurba)

My problem is that I haven't got a clue of how to design the cannister.....

May i suggest a thought that i have from longtime?

I am too lazy to do it by myself (and i don't have access to a lathe machine), but i always have been wondering about a radial scrubber mate with two concentrical "johnson screen" properly choosen.

They are made in SS 316 and have a very high "void/wall" ratio.

Maybe they can be an useful hint.

Only my idea.

**jmurba** · 27th May 2007, 05:29

Quote: (Originally Posted by gibbogeo)

May i suggest a thought that i have from longtime?

I am too lazy to do it by myself (and i don't have access to a lathe machine), but i always have been wondering about a radial scrubber mate with two concentrical "johnson screen" properly choosen.

They are made in SS 316 and have a very high "void/wall" ratio.

Maybe they can be an useful hint.

Only my idea.

Hi,

what is a johnson screen ?

regards

jean mi

Captain Randy · 27th May 2007, 05:49

Quote: (Originally Posted by jmurba)

Hi all,

after a couple of years spent working on a descent oxymeter to pilot my ccr dolphin I am going to built my own Rebreather....
My problem is that I haven't got a clue of how to design the cannister.....
I'd like to use a cylinder shaped cannister, like an original kiss one.
but how to chose the right, length,height,diameter to make an efficient cannister ?

help (((-:

regards

jean mi

I decided the best route was an extendaire canister. Consentrate on the plumbing and overall layout on you first go round.

Randy

gibbogeo · 27th May 2007, 10:35

Quote: (Originally Posted by jmurba)

what is a johnson screen ?

JohnsonScreens A Century of Screening Solutions

It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it.

I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant.

Two of the, concentrical, can be a good solution for containing the sodalime, i think.

Look at this, with the correct dimension i thin it can be interesting:

JohnsonScreens Continuous Slot-Pre-Pack

And they are in france...

paulraymaekers · 27th May 2007, 10:49

Quote: (Originally Posted by gibbogeo)

JohnsonScreens A Century of Screening Solutions

It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it.

I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant.

Two of the, concentrical, can be a good solution for containing the sodalime, i think.

Look at this, with the correct dimension i thin it can be interesting:

JohnsonScreens Continuous Slot-Pre-Pack

And they are in france...

hello, have you asked what price they ask

and you will still have to add a mesh, if not you will breath grains of sorb,

(also weight is an issue!)

paul

Tautaz · 27th May 2007, 14:20

Maybe a better idea to ask a "chaudronnier" man who solder iron and metals to make some kind of screen a la Johnson

you won't pay the brand name

Quote: (Originally Posted by gibbogeo)

JohnsonScreens A Century of Screening Solutions

It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it.

I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant.

Two of the, concentrical, can be a good solution for containing the sodalime, i think.

Look at this, with the correct dimension i thin it can be interesting:

JohnsonScreens Continuous Slot-Pre-Pack

And they are in france...

gibbogeo · 27th May 2007, 16:57

Quote: (Originally Posted by paulraymaekers)

hello, have you asked what price they ask

and you will still have to add a mesh, if not you will breath grains of sorb,

(also weight is an issue!)

paul

I know they are not so cheap, but i think the idea of the rod with a wire aroun d t make a continuous slot is worth to be seen.

Also the dimension of the opening can be as small as 0.1 mm.

The weight can be an issue in the standard scrren for water well, yes, but in a scrubber it should not support heavy weight, so it can be made with thin wires and i think this can result quite light.

The only big problem, i think, should be the cost of them.

**jmurba** · 27th May 2007, 17:21

Quote: (Originally Posted by gibbogeo)

JohnsonScreens A Century of Screening Solutions

It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it.

I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant.

Two of the, concentrical, can be a good solution for containing the sodalime, i think.

Look at this, with the correct dimension i thin it can be interesting:

JohnsonScreens Continuous Slot-Pre-Pack

And they are in france...

heu in fact my problem is not to built a cannister my problem is to design one ....

26th May 2007, 20:32	#1 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	cannister desing Hi all, after a couple of years spent working on a descent oxymeter to pilot my ccr dolphin I am going to built my own Rebreather.... My problem is that I haven't got a clue of how to design the cannister..... I'd like to use a cylinder shaped cannister, like an original kiss one. but how to chose the right, length,height,diameter to make an efficient cannister ? help (((-: regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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26th May 2007, 20:56	#2 (permalink)
GKAM digital nomad Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: May 2005 Location: Greece Posts: 254	Re: cannister desing Hi jean mi, Take a look here: References and you will find some very good USN reference documents on scrubber design. /GKAM __________________ Stay #
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26th May 2007, 23:18	#3 (permalink)
gibbogeo Gilberto Bonaga, Italy Current Rebreather/s: Classic Kiss Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Sep 2005 Location: italy Posts: 332	Re: cannister desing Quote: (Originally Posted by jmurba) My problem is that I haven't got a clue of how to design the cannister..... May i suggest a thought that i have from longtime? I am too lazy to do it by myself (and i don't have access to a lathe machine), but i always have been wondering about a radial scrubber mate with two concentrical "johnson screen" properly choosen. They are made in SS 316 and have a very high "void/wall" ratio. Maybe they can be an useful hint. Only my idea.
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27th May 2007, 05:29	#4 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: cannister desing Quote: (Originally Posted by gibbogeo) May i suggest a thought that i have from longtime? I am too lazy to do it by myself (and i don't have access to a lathe machine), but i always have been wondering about a radial scrubber mate with two concentrical "johnson screen" properly choosen. They are made in SS 316 and have a very high "void/wall" ratio. Maybe they can be an useful hint. Only my idea. Hi, what is a johnson screen ? regards jean mi __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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27th May 2007, 05:49	#5 (permalink)
Captain Randy New Member Current Rebreather/s: Dolphin Ray Other Rebreather/s: Dolphin Ray Join Date: Dec 2005 Location: Houston, Texas Posts: 45	Re: cannister desing Quote: (Originally Posted by jmurba) Hi all, after a couple of years spent working on a descent oxymeter to pilot my ccr dolphin I am going to built my own Rebreather.... My problem is that I haven't got a clue of how to design the cannister..... I'd like to use a cylinder shaped cannister, like an original kiss one. but how to chose the right, length,height,diameter to make an efficient cannister ? help (((-: regards jean mi I decided the best route was an extendaire canister. Consentrate on the plumbing and overall layout on you first go round. Randy
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27th May 2007, 10:35	#6 (permalink)
gibbogeo Gilberto Bonaga, Italy Current Rebreather/s: Classic Kiss Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Sep 2005 Location: italy Posts: 332	Re: cannister desing Quote: (Originally Posted by jmurba) what is a johnson screen ? JohnsonScreens A Century of Screening Solutions It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it. I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant. Two of the, concentrical, can be a good solution for containing the sodalime, i think. Look at this, with the correct dimension i thin it can be interesting: JohnsonScreens Continuous Slot-Pre-Pack And they are in france...
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27th May 2007, 10:49	#7 (permalink)
paulraymaekers rEvo's daddy Current Rebreather/s: rEvo Other CCR Home Build Other Rebreather/s: rEvo Other CCR Home Build Join Date: May 2005 Location: belgium Posts: 1,638	Re: cannister desing Quote: (Originally Posted by gibbogeo) JohnsonScreens A Century of Screening Solutions It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it. I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant. Two of the, concentrical, can be a good solution for containing the sodalime, i think. Look at this, with the correct dimension i thin it can be interesting: JohnsonScreens Continuous Slot-Pre-Pack And they are in france... hello, have you asked what price they ask and you will still have to add a mesh, if not you will breath grains of sorb, (also weight is an issue!) paul __________________ www.rEvo-rebreathers.com .... the earth is flat, Elvis is alive, and radial scrubbers give longer dwell time than axials...
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27th May 2007, 14:20	#8 (permalink)
Tautaz New Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Jan 2007 Location: Colomiers France Posts: 79	Re: cannister desing Maybe a better idea to ask a "chaudronnier" man who solder iron and metals to make some kind of screen a la Johnson you won't pay the brand name Quote: (Originally Posted by gibbogeo) JohnsonScreens A Century of Screening Solutions It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it. I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant. Two of the, concentrical, can be a good solution for containing the sodalime, i think. Look at this, with the correct dimension i thin it can be interesting: JohnsonScreens Continuous Slot-Pre-Pack And they are in france...
(Offline)

27th May 2007, 16:57	#9 (permalink)
gibbogeo Gilberto Bonaga, Italy Current Rebreather/s: Classic Kiss Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Sep 2005 Location: italy Posts: 332	Re: cannister desing Quote: (Originally Posted by paulraymaekers) hello, have you asked what price they ask and you will still have to add a mesh, if not you will breath grains of sorb, (also weight is an issue!) paul I know they are not so cheap, but i think the idea of the rod with a wire aroun d t make a continuous slot is worth to be seen. Also the dimension of the opening can be as small as 0.1 mm. The weight can be an issue in the standard scrren for water well, yes, but in a scrubber it should not support heavy weight, so it can be made with thin wires and i think this can result quite light. The only big problem, i think, should be the cost of them.
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27th May 2007, 17:21	#10 (permalink)
jmurba wet bear Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: May 2006 Location: cannes france Posts: 920	Re: cannister desing Quote: (Originally Posted by gibbogeo) JohnsonScreens A Century of Screening Solutions It is a kind of a screen (i think is "crepine" in french) made with rods and a continuous wire around it. I used t in making water wells in Africa, it have a very high ratio "hole/wall" and it is quite resistant. Two of the, concentrical, can be a good solution for containing the sodalime, i think. Look at this, with the correct dimension i thin it can be interesting: JohnsonScreens Continuous Slot-Pre-Pack And they are in france... heu in fact my problem is not to built a cannister my problem is to design one .... __________________ when will I be able to think about something else then spending hours underwater, when will I be normal ? http://web.mac.com/jmurba/Site_2/home.html http://web.mac.com/jmurba/Site_3/home.html
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