Increasing the pressure is usually done through uing a compressor which pumps gas in to the cylinder and this increases the pressure.
The pressure will increase
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The only two ways that come to mind are a temperature increase in the tank, or an increase in pressure in any feed lines supplying the tank.
well you can control the pressure of it but by level, that depends on how much oxygen is in the tank. the easiest way to change the pressure of oxygen can be by heating or cooling the tank.
decrease the temperature or increase the volume
When "bleeding" an oxygen tank, you are releasing excess pressure stored in the regulator, not the tank itself. If the excess pressure remains, it can damage the regulator, and the guage needle can get stuck, giving an inaccurate reading of how much oxygen remains in the tank.
In general any pressurized gas container is "empty" when the pressure inside is equal to ambient air pressure. There is still gas in the container, but not enough pressure to expell the gas. Medical oxygen tanks should never be allowed to go below 200psi. The tank is considered empty at this point and should be replaced.
-170 degrees
Depends how big the tank is, the pressure in it, the temperature, etc.
A pressure foot is used to measure air pressure inside a tank. This means that every square foot of the tank, there is a pound of pressure.
A damaged coil built inside the oxygen tank sparked inside the tank and caused the explosion