Gas Fitter Practice Test

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

1. 11.0" w.c.

2. psi

3. 10.0 psi

4. 15.0 psi

The correct answer is: 10.0 psi

The maximum output pressure from a first stage regulator is typically designed to reduce the incoming gas pressure to a lower and manageable level suitable for further regulation. In the context of natural gas systems, a first stage regulator generally reduces the pressure to a range that ensures safety and proper operation of downstream appliances or second stage regulators. The correct answer, 10.0 psi, is commonly recognized as an acceptable maximum output for residential applications involving natural gas systems. This limit helps to ensure that gas appliances receive a safe and consistent pressure that enables them to function efficiently while preventing potential overpressurization. In contrast, other values listed, such as 11.0" w.c., are more representative of measurement units that might apply to specific applications rather than a maximum output of a first stage regulator, thus making them unsuitable for this question. Similarly, while pressures may exist beyond 10.0 psi in industrial systems, 15.0 psi would typically exceed the typical operational range for a first stage regulator in standard gas distribution systems.