The pressure gauge on a full acetylene cylinder should indicate approximately how many psig?

The pressure gauge on a full acetylene cylinder typically indicates around 250 psig. Acetylene is a gas that can become unstable at pressures above 15 psig, which is why it is stored in a cylinder that is filled with a solvent (usually acetone or dimethylformamide) to dissolve the acetylene and stabilize it.

The full cylinder pressure is maintained at a level that ensures safety while allowing for proper use during welding and cutting operations. When the cylinder is full, the gauge reading reflects the higher internal pressure due to the dissolved gas and the pressurization of the solvent. This standard gauge reading indicates that the cylinder is at capacity and ready for usage within safe operating parameters. Carrying out tasks like welding with acetylene requires this specific pressure level to ensure the delivery of gas while maintaining safety standards.