Recertifying nitrous bottles?
#2854885
12/03/20 06:23 PM
12/03/20 06:23 PM
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Joined: Apr 2006
Posts: 4,220 West Plains, MO
DrCharles
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I have two 10 lb nitrous bottles (from NOS) that appear to be in perfect condition but way out of date. One I bought new in the mid-90's, filled a few times, and haven't used since then. Anyway I'll need to get them DOT-recertified before filling. I believe the stamp is good for five years. There does not seem to be any place in southern Missouri to get it done, though. Local welding gas place doesn't. One speed shop in Springfield (still 2 hrs away) sells N2O but doesn't recertify. They might have to go to St. Louis (3.5-4 hour drive from here!)... Any thoughts?
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Re: Recertifying nitrous bottles?
[Re: 70HemiGTX]
#2854908
12/03/20 07:34 PM
12/03/20 07:34 PM
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DrCharles
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Thanks. We do have one of those companies... a few years ago, I took an old empty CO2 extinguisher to them to pressure-test the bottle (only). That's all I asked for, not to certify it as an extinguisher or guarantee it for use. They did nothing for 2 weeks, then said "the valve was leaking so they couldn't test the bottle" but they'd be glad to sell me a valve for $95 and then test it (and charge more). Haven't been inclined to do any more business with them. But I might have to grit my teeth and give them a call...
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2855214
12/04/20 01:12 PM
12/04/20 01:12 PM
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DrCharles
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On FABO someone sent me a link to Marmic Fire & Safety which has multiple locations, the closest of which is Mtn. Home AR (40 miles away). $38.50 plus tax to hydrotest each bottle, will take about a week Next step will be finding a place that refills nitrous bottles, but one step at a time. I'm still dialing in my QFT 950, anyway
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2855215
12/04/20 01:18 PM
12/04/20 01:18 PM
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Thanks for the hints, I'll try those. You wouldn't think there would be much call for scuba diving here in BFE, Missouri... but Norfork Lake is only 50 miles away and people do dive in it. There are actually two listings in my otherwise waterless town of 12,000... go figure Also we do have a Coca-Cola distributor. I'll ask them too. The medical supply houses may or may not be helpful (ditto the local hospital). It's a matter of finding the right person to ask. NOT the $8/hr receptionist. I live in St. Louis. I got my PADI dive certification at Lake Norfork in 1973. Fun times, camping at Buzzards Roost campground. Back then Hway 101 still had a ferry crossing the lake. Long gone, replaced by a bridge. Is the Scuba-Doo dive shop in Mountain Home still open?
Last edited by 318 Stroker; 12/04/20 02:12 PM.
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2855630
12/05/20 11:42 AM
12/05/20 11:42 AM
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A gas supplier should be able to do it. When they get bottles out of date, they need to test certify and re-stamp them before re-filling. Many welding suppliers are not re-fillers, they just buy from the local AirGas or Linde distributor. The hydrostatic test doesn't take that long itself, but after removing the valve from the bottle, it is filled with water and left to sit about a day for the temperature to stabilize. After testing, they need to sit up-side down about a day to dry, unless they hook up a vacuum to the bottle. I did that as a summer job at AirGas back around 1985. Very few tanks failed, but a few if the split a wall, I'd get drenched from all the water spraying out of the test chamber. The test measured water displacement in the test chamber as the bottle is pressurized to see how much the bottle expands under pressure.
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2855657
12/05/20 12:23 PM
12/05/20 12:23 PM
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Look at the date of manufacturer stamped on the bottle. If it's too old, the testing site might not even test the bottle because of risk of bursting. Chances are your bottles will pass the test, but won't won't be recertified because the bottles are past their lifespan. But, the lifespan of the bottle depends on the material the bottled is made from. Some bottles have an unlimited lifespan. These are things to think about. Here is a link about testing nitrous bottles http://nitroustech.com/crown-markings/
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Re: Recertifying nitrous bottles?
[Re: GMP440]
#2855678
12/05/20 12:58 PM
12/05/20 12:58 PM
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Look at the date of manufacturer stamped on the bottle. If it's too old, the testing site might not even test the bottle because of risk of bursting. Chances are your bottles will pass the test, but won't won't be recertified because the bottles are past their lifespan. But, the lifespan of the bottle depends on the material the bottled is made from. Some bottles have an unlimited lifespan. These are things to think about. Here is a link about testing nitrous bottles http://nitroustech.com/crown-markings/ Reminds me of the time we had to recert all the fire bottle on the destroyer I was on. Some of them were war booty and had past testing stamps with the Nazi eagle and swastika on them. Weird feeling, especially when you consider that the ship I was on wasn't even commissioned till more than 30 years after WWII ended, As for the bursting concern, they are tested hydraulically and inside a burst proof container just to minimize that issue, any bottle can potentially burst under test.
Last edited by Sniper; 12/05/20 01:01 PM.
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Re: Recertifying nitrous bottles?
[Re: GMP440]
#2855679
12/05/20 12:58 PM
12/05/20 12:58 PM
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DrCharles
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Thanks for the info! I'm familiar with the mechanics of the hydrostatic test. Already consulted with the Marmic rep who did not anticipate a problem with my mid' 90's stamp dates. From the link you provided: "most nitrous bottles whose DOT numbers begin with 3ALM are required to be tested every 5 years, with an unlimited lifespan." So I should be OK there. My local Airgas would only order me a 50 lb bottle of nitrous, and didn't seem to be interested in hydrotesting my existing tanks. Anyway I'll post back once I get the test results
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2855715
12/05/20 02:13 PM
12/05/20 02:13 PM
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Thanks for the info! I'm familiar with the mechanics of the hydrostatic test. Already consulted with the Marmic rep who did not anticipate a problem with my mid' 90's stamp dates. From the link you provided: "most nitrous bottles whose DOT numbers begin with 3ALM are required to be tested every 5 years, with an unlimited lifespan." So I should be OK there. My local Airgas would only order me a 50 lb bottle of nitrous, and didn't seem to be interested in hydrotesting my existing tanks. Anyway I'll post back once I get the test results So Airgas only wanted to get you new tanks, but wouldn't refill your existing tanks? Take a look anyway for the codes to confirm. Your's probably has the 3ALM. Maybe talk to some races and see where they get their tanks filled.
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Re: Recertifying nitrous bottles?
[Re: Sniper]
#2855929
12/06/20 10:06 AM
12/06/20 10:06 AM
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Look at the date of manufacturer stamped on the bottle. If it's too old, the testing site might not even test the bottle because of risk of bursting. Chances are your bottles will pass the test, but won't won't be recertified because the bottles are past their lifespan. But, the lifespan of the bottle depends on the material the bottled is made from. Some bottles have an unlimited lifespan. These are things to think about. Here is a link about testing nitrous bottles http://nitroustech.com/crown-markings/ Reminds me of the time we had to recert all the fire bottle on the destroyer I was on. Some of them were war booty and had past testing stamps with the Nazi eagle and swastika on them. Weird feeling, especially when you consider that the ship I was on wasn't even commissioned till more than 30 years after WWII ended, As for the bursting concern, they are tested hydraulically and inside a burst proof container just to minimize that issue, any bottle can potentially burst under test. I just had this discussion with my gas supplier. He said that there are still oxygen cylinders in the system dating back to the early 1900's that were manufactured in Germany and have the swastika and Eagle. According to him they entered the market following WWI.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2856949
12/08/20 09:45 AM
12/08/20 09:45 AM
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Joined: Jan 2003
Posts: 13,357 Marion, South Carolina [><]
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Most places around here are in the $6.50 per pound range. It is a lot higher than it used to be. I get 73 lb mother bottles for around $235 and fill my own.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Recertifying nitrous bottles?
[Re: an8sec70cuda]
#2856992
12/08/20 11:21 AM
12/08/20 11:21 AM
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Joined: Dec 2013
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The two places I get it sell it for $5 per lb.
I'm planning on a mother bottle to fill my own bottles next season.
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Recertifying nitrous bottles?
[Re: DrCharles]
#2857056
12/08/20 01:27 PM
12/08/20 01:27 PM
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Thanks. I found a place in Mtn. Home (where I had the bottles recertified) that will fill them for $6.50/lb. They'll even go pick them up from the fire service place I don't expect to be using it enough to justify having a mother bottle, since I'm on the street with street tires. Another 100-150 hp would just blow them off worse Time for Drag Radials!
'63 Dodge 330 11.19 @ 121 mph Pump gas, n/a, through the mufflers on street tires with 3.54's. 3,600 lbs. 10.01 @ 133mph with a 250 shot of nitrous an a splash of race gas. 1.36 60 ft. 3,700 lbs.
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Re: Recertifying nitrous bottles?
[Re: GY3]
#2859612
12/13/20 10:18 PM
12/13/20 10:18 PM
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DrCharles
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Looks like I got ripped off. I weighed the spare bottle, clearly marked on the original NOS label as 24 lb, 12 oz (when full with 10 lb). On my digital postal scale it only weighs 21 lb 10 oz! So there's only 7 lb in it. The one in the car is 24 lb 4 oz, so he "only" shorted me half a pound on that one. Guess who's getting a call tomorrow... And the credit card company if he doesn't have the right answers. At a minimum I'm doing a chargeback for 3.5 lb at 6.50/lb, and maybe more if he pissed me off. Doesn't ANYONE do the job they're getting paid for any more??
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