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Old 07-15-2008, 06:36 AM   #1 (permalink)
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2 x 2 exemption code

Well it is a long known thing that any tank under 2" in diameter and 2 feet in length is exempt from hydrotesting. Now for months i have been trying to find it in writing on a real manufacturer website or DOT site. I see it all over PB sites, but those aren't "legit" ya know. You can't contend someone not wanting to fill a tank by saying, "PBN said it is ok." So after much searching, and numerous emails to the DOT (none of which were ever answered), i finally found my answer...

Requalification of Aluminum Cylinders

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Technical Support Document
Requalification (retesting) of Aluminum Cylinders
July 1, 2008
The requalification of cylinders was formally known as the retesting of cylinders. Requalification is done to ensure that a cylinder is still acceptable to continue to be used as a pressure vessel to transport hazardous material. DOT requalifying of a cylinder and the marking thereof are to be performed by an approved DOT requalification facility that has been issued a DOT Requalifiaction Identification Number (RIN). The requirements for the requalifying of DOT cylinders in the US are identified in Title 49 of the Code Of Federal Regulations (CFR) in part 180, "Continuing Qualification and Maintenance Of Packaging" and any applicable DOT exemption.

The requalifying requirements of any cylinder are specific to the DOT specification and/or exemption to which the cylinder was manufactured. The DOT specification and/or exemption number are stamped on the crown of the cylinder. Cylinders manufactured by Catalina Cylinders are marked with "M4002" on the crown of the cylinders. Cylinders manufactured by Catalina Cylinders Cliff Impact Division are marked with "CLIFFDIV" on the crown of the cylinder.

The most basic of the retesting requirements for cylinders manufactured by Catalina Cylinders and Catalina Cylinders Cliff Impact Division are identified below.
DOT-3AL Cylinders (Catalina Cylinders and Catalina Cylinders Cliff Impact Division)
Requalifying required every five (5) years. Requalifying of a cylinder is to be performed five (5) years after the original manufacturing hydrostatic test date stamped on the crown of the cylinder. In section 180.205 it states that a cylinder that is filled before the retest date may remain in service until it is emptied of its charge. In other words, a cylinder that currently has a charge when the 5 year retest date occurs does not have to be drained of its charge and retested. The charge can be used and the cylinder retested after the charge has been used.
The requalifying specified in part 180 consists of an internal inspection and hydrostatic retesting of the cylinder at a pressure equivalent to 5/3 the service pressure of the cylinder.
Catalina Cylinders and Catalina Cylinders Cliff Impact Division are not a requalifiers of cylinders to the general public. If you go to this website, http://hazmat.dot.gov/sp_app/approvals/hyd...o_retesters.htm, you will find a complete list of DOT approved retesters throughout the country.
There are a few companies that have DOT exemptions to requalify cylinders by Ultrasonic Examination (UE) of the cylinders instead of visually inspecting and hydrostatically retesting the cylinders. In some cases there are benefits to this type of requalifying.
DOT-3AL Cylinders "2 by 2 rule" (Catalina Cylinders Cliff Impact Division only)
Requalification not required per the note under table 1 in 49CFR part 180.205. The note reads, "Any cylinder not exceeding two (2) inches in outside diameter and less than two (2) feet in length is exempt from volumetric expansion testing."
DOT-39 Cylinders (Catalina Cylinders Cliff Impact Division only)
These are non-refillable cylinders and do not require requalifying..
E-7737 (Aluminum DOT-3E) Cylinders (Catalina Cylinders Cliff Impact Division only)
Requalifying is not required.
Eddy current inspection of the threads in 6061 aluminum cylinders is not required by the DOT and is not mandated as necessary by Catalina Cylinders. Cylinders manufactured by Catalina Cylinders and Catalina Cylinders Cliff Impact Division have only been manufactured from aluminum alloy 6061, not aluminum alloy 6351, and do not require any special testing or inspection of the neck, threads or shoulder of the cylinders.

All cylinders that have been successfully requalified will have the date of the retest (month and year) stamped in the crown of the cylinder with the RIN of the DOT approved requalification facility stamped between the month and year of the retest date.

If you have any questions with regards to the requalifying of cylinders manufactured by Catalina Cylinders or Cliff Impact please do not hesitate in contacting us directly.



So yeah, go to that page and print that up. Then if you get questions about not filling the tanks due to hydro, have seen it happen multiple times, you have this. I am tempted to find the exact paragraph it lists in that piece there, but after months of searching, i am happy enough with this for today. Maybe tonight i will find the exact paragraph in the DOT codes.
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Old 07-15-2008, 10:35 AM   #2 (permalink)
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There isn't really a specific paragraph. If you look up the info: table 1 in 49CFR part 180.205, you find a chart.

But the problem is that the local field still doesnt have to fill the tank, regardless.

When I filled tanks, I'd see lots of old 7 and 10oz tanks, where the owner would demand I follow the 2x2 rule. If in good shape, I would, but if scratched, gouged, sanded, chipped, etc, I would still not fill it. There are lots of 20 year old 7oz tanks in paintball. The 2x2 rule does not automatically make them safe, and the local field should still be doing a quick visual on every tank.
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Old 07-15-2008, 10:42 AM   #3 (permalink)
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Oh i totally agree. If the tank looks like trash, don't fill it. I would never say you have to fill every tank. I am all about safety. I am just posting this becase i have seen many fields decline to fill brand new, like pristine looking 3.5 oz tanks before because of their hydro code and them not believing that they never needed hydro. At a few fields in fact. Just trying to be informative.
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Old 07-15-2008, 11:01 AM   #4 (permalink)
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As policy the local shop I sometimes work at, and the associated field will not fill any tank out of date regardless of that rule.
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Old 07-15-2008, 11:01 AM   #5 (permalink)
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Old 07-16-2008, 10:58 PM   #6 (permalink)
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Quote:
Originally Posted by punkncat View Post
As policy the local shop I sometimes work at, and the associated field will not fill any tank out of date regardless of that rule.
What, are they trying to sell more tanks?.........

Do you guys get any complaints from people with Co2 tanks?
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Old 06-04-2013, 12:20 PM   #7 (permalink)
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In Canada, the 2x2 rule is not applicable.
However, if a tank holds less than 1 litre, it does not require testing.
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Old 06-04-2013, 12:29 PM   #8 (permalink)
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Quote:
Originally Posted by vv0mp View Post
In Canada, the 2x2 rule is not applicable.
However, if a tank holds less than 1 litre, it does not require testing.
Wouldn't a 2x2 tank be less than 1L?

Last edited by ta2maki; 06-04-2013 at 01:30 PM.
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Old 06-04-2013, 01:28 PM   #9 (permalink)
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Quote:
Originally Posted by punkncat View Post
As policy the local shop I sometimes work at, and the associated field will not fill any tank out of date regardless of that rule.
Not cool.
I have had S.C. Village give me crap about hydro dates. they claim there are no five year hydros. I rarely go there anymore...
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Old 06-04-2013, 02:14 PM   #10 (permalink)
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Quote:
Originally Posted by ta2maki View Post
Wouldn't a 2x2 tank be less than 1L?
Yes, but so are a lot of other larger tanks. A 20 oz CO2 tank for instance holds less than 1 liter, as well as a 48 c.i. HPA tank.
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