What is the maximum PSI for single-suction pumps?

What is the maximum PSI for single-suction pumps?

• A. 200
• B. 300
• C. 100
• D. 400

Answer: (A)

The main idea is that single-suction centrifugal pumps have a practical pressure limit set by their mechanical design. They’re built to handle a certain amount of axial thrust, bearing loads, and seal stresses, all of which increase with higher discharge pressures. For common distribution-service units, that limit is around 200 psi. Pushing beyond this can shorten seal life, raise wear on bearings, and exceed the pump’s casing and impeller stresses. When higher pressures are needed, you’d use a double-suction pump or stage pumps in series, rather than forcing a single-suction unit to operate above its rating. That’s why 200 psi is the correct maximum. Higher values would require a different pump configuration, and a value like 100 psi would underutilize typical single-suction capabilities.

The main idea is that single-suction centrifugal pumps have a practical pressure limit set by their mechanical design. They’re built to handle a certain amount of axial thrust, bearing loads, and seal stresses, all of which increase with higher discharge pressures. For common distribution-service units, that limit is around 200 psi. Pushing beyond this can shorten seal life, raise wear on bearings, and exceed the pump’s casing and impeller stresses. When higher pressures are needed, you’d use a double-suction pump or stage pumps in series, rather than forcing a single-suction unit to operate above its rating. That’s why 200 psi is the correct maximum. Higher values would require a different pump configuration, and a value like 100 psi would underutilize typical single-suction capabilities.