After the first-stage regulator, the intermediate pressure is approximately:

After the first-stage regulator, the intermediate pressure is approximately:

• A. 4-8 psi
• B. 14-16 psi
• C. 45-50 psi
• D. 60-70 psi

Answer: (C)

After the first-stage regulator, gas is brought from highly variable cylinder or pipeline pressure down to a stable intermediate pressure that the rest of the machine uses. That intermediate pressure is kept around 45–50 psi. This level is high enough to drive the downstream regulators and flowmeter system, yet well below the incoming supply pressures. The other options are outside this typical band: 4–8 psi and 14–16 psi are too low for the intermediate stage, and 60–70 psi would exceed the usual supply pressure the regulator is designed to drop from. Therefore, about 45–50 psi is the standard intermediate pressure.

After the first-stage regulator, gas is brought from highly variable cylinder or pipeline pressure down to a stable intermediate pressure that the rest of the machine uses. That intermediate pressure is kept around 45–50 psi. This level is high enough to drive the downstream regulators and flowmeter system, yet well below the incoming supply pressures. The other options are outside this typical band: 4–8 psi and 14–16 psi are too low for the intermediate stage, and 60–70 psi would exceed the usual supply pressure the regulator is designed to drop from. Therefore, about 45–50 psi is the standard intermediate pressure.