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Is there a special requirement to have a recovery tank at 400psi for all refrigerant
The empty weight of a 100 cubic foot steel SCUBA tank is approximately 33lbs.
30 lb
Yes. Not sure on the exact weights (as it depends on size of tank and pressure of the gas) but you can tell a definite weight difference between an empty and full tank because the compressed air does have a weight
If the tank is actually filled to the brim (tanks never are) the water would weigh 8.35lbs x 30gallons which is 250.5 lbs. To obtain an accurate total weight you would have to add in the weight of the sand/gravel substrate, and the rocks (decore) and the weight of the empty tank. Then you would subtract the weight of the top 1 inch or so that is always left empty.
8,900 pounds....empty diesel fuel tank
empty?
a typical steel "30 pound" liquid propane tank weighs about 25-28 pounds empty. propane tank markings (on collar) propane weighs about 4.125 pounds per gallon and a "30 pound tank" will hold about 7.5 gallons so a full tank will weigh about 55 pounds or so. Typical recertification stamp: MM XXX YY E MM -> 2 digit recertification month XXX ->3 character Re-qualifier's registration number YY -> 2 digit recertification year E ->States the cylinder has been externally examined WC -> Water capacity of the cylinder. TW -> Tare weight of the cylinder (what the tank weighs empty) ICC, DOT, BTE, CTC or TC -> Specification number eg. TC4BA240 10 89 -> Date of manufacture (October. 1989)
the tank may explode
Something not everyone takes into account is that every molecule has a weight, even the molecules that make up air. It may not be noticeable, but it's definitely present. So if by "empty tank" you mean "a tank containing no molecules", and it were compared to a tank filled with air, or "a tank containing at least one molecule", then you can see that a tank filled with air will weigh more than an empty tank (although the difference may be very very small).
All propane cylinders will have a TW stamped in the valve protection ring. The tare weight or TW is the weight of the cylinder empty. TW 18 would be a 18 pound empty cylinder. If you weigh a TW 18 cylinder on a bathroom scale, and it weighs 28 pounds there would be 10 pounds of propane remaining in the cylinder.
old refrigerant is a gas and needs to be pumped out or removed via vacuum with the proper machine which deposits it into the same type of tank that new refrigerant is contained in because of pressure. evacuating refrigerant into the air is dangerous and if inhaled is poisonous to people. not to mention illegal if in California. You could try one of those conversion kits from r12 to r134 hooking up the hoses may allow refrigerant to flow into an empty refrigerant btl.