Quote:
Originally Posted by rhagfo
I thought recertification was only good for 5 years, unless hydro
tested.
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Quote:
Originally Posted by WDPatterson
They're not Scuba tanks. They're propane tanks. Propane is a completely different thing. Go to your local propane dealer, or get online. It's easily findable, and it has nothing to do with 5 years and scuba tank ratings.
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Well not entirely, one of the 12 year recertifications requires Volumetric Expansion test. While not true "Hyrdo Testing" it does involve the displacement of water.
Described as;
The most intensive method of requalification is the Volumetric Expansion test, a pressure test to determine a cylinder’s total and permanent expansion at a given pressure.
The volumetric expansion test is conducted using the water jacket or direct expansion methods:
(1) Water jacket method is a volumetric expansion test to determine a cylinder’s total and permanent expansion by measuring the difference between the volume of water the cylinder externally displaces at test pressure, and the volume of water the cylinder externally displaces at ambient pressure.
(2) Direct expansion method means a volumetric expansion test to calculate a cylinder’s total and permanent expansion by measuring the amount of water forced into a cylinder at test pressure, adjusted for the compressibility of water, as a means of determining the expansion.
Recertification done by Volumetric Expansion is good for 12 years.
https://paracogas.com/blog/propane-c...tion-explained
https://www.phmsa.dot.gov/sites/phms...pane_en_v3.pdf
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