What is the maximum output pressure from a first stage regulator?

The maximum output pressure from a first stage regulator is 10.0 psi. This is because first stage regulators are designed to reduce high inlet pressures from the gas supply system down to a manageable level for further regulation. Typically, the first stage regulator outputs pressure measured in psi, and for many common systems, this output level is standardized at 10.0 psi. It is crucial for safe operation to maintain this regulated output pressure to prevent over-pressurization of downstream components.

In the context of gas regulation, the other options present either incorrect values or units that are not applicable. For instance, a pressure measurement of 11.0" w.c. refers to water column inches, which is typically associated with low-pressure systems rather than standard output from a first stage regulator. The use of "psi" without any value lacks specificity, while 15.0 psi exceeds the commonly accepted maximum output for a first stage regulator.