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Author Topic: Three 500 cc Tanks  (Read 357 times)

rsterne

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Three 500 cc Tanks
« on: June 23, 2017, 04:23:31 PM »
I just received my 300 bar, 500 cc tank from AliExpress today.... I'm very impressed, with both the tank, and the service.... I already had two other 500 cc tanks, so I thought you would be interested in how they compare....



On the bottom is a 3000 psi tank, which weighs 1 lb. 10 oz.... In the middle is the new CF 300 bar (4350 psi), which weighs 1 lb. 5 oz.... On the top is a tank from England, rated at 250 bar (3625 psi), which weighs 1 lb. 13 oz.... The tanks are all sitting level at the bottom, so you can see the difference in length on the left side of the photo.... The 3000 psi tank has 5/8"-18 NF threads, while the other two use 18mm x 1.5mm threads.... They are all 60mm diameter....

Bob



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rsterne

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Re: Three 500 cc Tanks
« Reply #1 on: June 23, 2017, 06:34:36 PM »
I have already had an email about them not complying with the DOT and TC markings, which I would agree is the case.... You probably can't get them filled in the USA or Canada.... I purchased the tank for my own use, after checking on the design spec. which is GB-28053-2011.... That is a very detailed technical specification, but here was the part I was concerned with, for my own peace of mind....

Quote
5.2.2 Design of gas cylinders
5.2.2.1 hydrostatic test pressure shall be nominal 5/3 times the working pressure.
5.2.2.2 minimum burst pressure shall be 3.4 times the nominal working pressure.
5.2.2.3 cylinder design life of 15 years.

I am not recommending that anyone else purchase one, and I would expect you can't get it filled it you do.... but for my purposes I am satisfied that they will work just fine.... My gun will be equipped with a 5K burst disc, which is way under the test pressure, and still only about 1/3 of the burst pressure.... There is a difference between complying with marking requirements, and a safe product, IMO.... and yes, I am willing to bet my life on it.... within the parameters specified....

Bob
« Last Edit: June 23, 2017, 07:21:44 PM by rsterne »
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Monkeydad1969

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Re: Three 500 cc Tanks
« Reply #2 on: June 24, 2017, 06:05:38 AM »
Thanks for the info, Bob.

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