For boilers over 300 psi, the blow-off vessel must withstand at least how many psi?

For boilers over 300 psi, the blow-off vessel must withstand at least how many psi?

• A. One hundred psi
• B. Two hundred psi
• C. Three hundred psi
• D. Five hundred psi

Answer: (A)

When dealing with high-pressure boilers, the blow-off vessel must be able to absorb the pressure of the blowdown and any resulting surge without failing. That means its maximum allowable working pressure should exceed the boiler’s operating pressure to provide a safety margin. For boilers over 300 psi, the minimum rating for the blow-off vessel is 500 psi. A vessel rated at 100, 200, or even 300 psi would not provide enough margin for the higher boiler pressures and potential surges, making it unsafe. So the 500 psi requirement ensures the vessel can safely handle the worst-case blowdown conditions.

When dealing with high-pressure boilers, the blow-off vessel must be able to absorb the pressure of the blowdown and any resulting surge without failing. That means its maximum allowable working pressure should exceed the boiler’s operating pressure to provide a safety margin. For boilers over 300 psi, the minimum rating for the blow-off vessel is 500 psi. A vessel rated at 100, 200, or even 300 psi would not provide enough margin for the higher boiler pressures and potential surges, making it unsafe. So the 500 psi requirement ensures the vessel can safely handle the worst-case blowdown conditions.