What is the rated pressure of the steam main referenced in the desuperheater branch line question?

What is the rated pressure of the steam main referenced in the desuperheater branch line question?

• A. 600 psi
• B. 150 psi
• C. 900 psi
• D. 1200 psi

Answer: (A)

Pressure rating of the steam main sets the limit for everything fed from it. A desuperheater branch line is tied directly into that main, so it must be designed to handle the same pressure as the main supply. In this scenario, the steam main feeding the desuperheater branch is specified at 600 psi, so the branch line and desuperheater components are rated for that pressure. The other pressures wouldn’t match the system’s actual main pressure and would either under- or over-design the piping and valves. Therefore, the rated pressure is 600 psi.

Pressure rating of the steam main sets the limit for everything fed from it. A desuperheater branch line is tied directly into that main, so it must be designed to handle the same pressure as the main supply. In this scenario, the steam main feeding the desuperheater branch is specified at 600 psi, so the branch line and desuperheater components are rated for that pressure. The other pressures wouldn’t match the system’s actual main pressure and would either under- or over-design the piping and valves. Therefore, the rated pressure is 600 psi.