tank

Dacor (Luxfer) aluminum 80cf tank with Thermo Pro DIN/Yoke valve, including DIN insert. Recently hydro’d (December 2015), visually inspected, and oxygen cleaned (tank and valve). Local pickup only from Long Island City, NY, 11109; PM me if interested. This tank has served me well over the...

I have two questions about tanks: 1) Someone told me, it is not good to store cylinders fully pressurized for prolonged periods, as afterwards they may fail to pass the hydrostatic tests. Is that true? How serious? What would be then an acceptable pressure? 2) Why was I taught in the courses...

I'm sure this must have been covered before but I can't find it. What holds more air, a 10 litre 300 bar or a 12 litre 232 bar? Currently have a 15 litre 232 and it's killing me! Too heavy and not enough air left for a second dive so it gets wasted. Oh, and I'm not the tallest of people. Most...