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Author Topic:   Gas cylinder size?
Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 05-31-2005 08:30 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
I just got a Millermatic 135 MIG welder and I need to get a shilding gas cylinder. I want a tank big enough to last for a few jobs. I'll be welding mostly subframe connectors, roll cages, maybe some body work. Stuff like that. Maybe not too big a cylinder so the unit remains somewhat portable. What size do you recommend? What size do you use? Since i'll be welding mild steel, I want 25% CO2/75% Argon, right? Thanks!

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SteveLaRiviere
Administrator

Posts: 45869
From: Saco, Maine
Registered: May 99

posted 05-31-2005 09:05 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I just told the guy at the welding supply store what I was doing and asked for C25 and he pulled out the cylinder I needed. I was under the impression that there was only one size. Mine is about 30" tall.

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'70 Mustang Mach 1 351C 4V/FMX/3.25 Open
'70 Mustang Convertible 250 I6/3 speed/2.79 Open
'72 Mustang Sprint Hardtop 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip

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Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 05-31-2005 09:29 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
So is that a 40 ft^3 cylinder?

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senzstang
Gearhead

Posts: 335
From: perry, oh, usa
Registered: May 2002

posted 06-01-2005 08:20 AM     Click Here to See the Profile for senzstang   Click Here to Email senzstang     Edit/Delete Message   Reply w/Quote
If you are using the preset flowmeter that used to be standard with that set up, a 20 cf cylinder will give you approximately 35-45 minutes of weld trigger time. That is not much. I would go for at least a 40cf cylinder and would consider an 80 cf if the cost wasnt too much more. An 80cf cyl is about 3 feet high.
You should consider the cost of refilling. Small cylinders typically cost almost as much to fill as a med cyl.
Just keep in mind that the smaller you go, the more you will need to refill. Just like propane, you rarely run out when the welding shop is open!
Phil

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Robert K
Gearhead

Posts: 706
From: Nashville, TN
Registered: Apr 2000

posted 06-01-2005 08:30 AM     Click Here to See the Profile for Robert K   Click Here to Email Robert K     Edit/Delete Message   Reply w/Quote
I've got the one that Steve mentioned. It's about 30" high. It's the largest cylinder you can get without out renting (at least around here anyway). You won't be sorry you got the larger cylinder. I started out with the small one and was always out of gas.
You're going to love the Millermatic ! I've got the 130 and have had it for about 9 years and it's worked flawlessly.

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67convertible 289/auto
65fastback 302/4sp

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 06-01-2005 03:47 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
The gas cylinder on mine is around 4ft tall. I believe it holds around 120 cubic feet of gas... I double check the size later... but it lasts forever. I usually only have to refill it once every three years or so. Bottle rent is $85 for five years, which comes out to $17/yr. Refills only cost 20-some bucks.

I like the big bottle. Of course, it sits on a cart with the welder.

Good Luck!

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

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Kyle
Gearhead

Posts: 430
From: Sumner, WA
Registered: Dec 2001

posted 06-01-2005 04:05 PM     Click Here to See the Profile for Kyle   Click Here to Email Kyle     Edit/Delete Message   Reply w/Quote
I called my local Praxair welding shop, and they said I can get a 40ft^3 cylinder (2ft tall) for $120, and it costs about $24 to refill when necessary. Or, I can get a 90ft^3 cylinder (3ft tall) for $160, and it costs about $34 to refill. So, I think i'll get the larger cylinder for the extra $40. Over twice the capacity, and only an extra $10 to fill, sounds like a good deal to me.

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n2oMike
Gearhead

Posts: 2831
From: Spencer, WV
Registered: Jan 2001

posted 06-01-2005 08:07 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote
Mine is 48" tall to the top of the cap and is 7" in diameter. It is sold as a 'DEY' cylinder Linde, and the capacity is 124 cubic feet. As I said above, it lasts a VERY long time.

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Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220

[This message has been edited by n2oMike (edited 06-01-2005).]

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