View attachment 88966
Sir this is my setup , i live in India , cylinder with water volume about 3.1 liters or maximum 3.5 liters . this is the cylinder i bought from welding shop . aluminium cylinder , originally designed for oxygen , the welding store said it could be used for nitrogen , checked in the cylinder manufacturer website it says the same , so bought the empty cylinder filled with nitrogen , first time had to empty the cylinder as i had to relocate to another city . so my next attempts started in last six months , the cylinder was full empty i opened the valve without attaching the regulator . could air from outside entered the cylinder ? then i went and refilled the cylinder with welding nitrogen , planned a day proceeded , i took breath for 5 minutes from the cylinder , i was monitoring with pulse oxymeter the oxygen level wasnt dropping . i emptied the cylinder and went and refilled the cylinder from another vendor , same case i felt nothing even after inserting the vinyl tubing in to my nose and breathing directly from it at 20l / min the blood oxy level wasnt dropping , at 20 l/min the cylinder refilled at 2000 psi was able to supply gas for 18-20 minutes . the regulators are cheap and everything is cheap in the picture , this is the maximum i could afford . what am i doing wrong , is it the purity of nitrogen gas to be blamed , or if it the previous volume of air that existed in the cylinder before refill that to be blamed , i do not understand the science behind it , i could probably never afford a hand helpd nitrogen purity meter which costs like 200 to 300 usdollars .