Issue of residual pressure in gas cylinders
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Is there a **standard** for the residual pressure that should remain in a gas cylinder after use? How much pressure is considered safe? Acetylene, oxygen, hydrogen, inert gases, etc. – results available online
Safety measures must be implemented in strict accordance with relevant specifications and standards... A residual pressure of 0.05 MPa must remain inside the bottle
0.05, this is the requirement.
Previously, a certain residual pressure should remain in the gas cylinder after use, such as 0.05 MPa. But now gas cylinder filling companies basically don’t bother with this anymore; the cylinders taken back are evacuated before being refilled.
For specific details, refer to clause 6.7 on safety regulations for cylinders and gas use in the Technical Regulations for Safety Inspection of Gas Cylinders (TSG R0006-2014): For compressed gases and dissolved acetylene gases, the residual pressure must be no less than 0.05 MPa； Liquefied gases, cryogenic liquefied gases, and cryogenic liquid gas cylinders must be filled to a level of not less than 0.5%-1% of the specified filling capacity ；
I learned it, but I really hadn’t noticed before – we only stop when there’s no air left
Why can’t it be used and stopped only when it’s gone? What’s the risk in stopping once it’s used up?