What steps would you take to troubleshoot a low suction pressure reading while drafting?

What steps would you take to troubleshoot a low suction pressure reading while drafting?

• A. Increase discharge pressure and open all downstream valves.
• B. Ignore the reading and continue drafting.
• C. Close the intake valve and observe.
• D. Inspect suction lines for leaks or air pockets, ensure the intake strainer is clear, verify priming equipment; re-prime and bleed as needed.

Answer: (D)

When you’re seeing low suction pressure while drafting, the core goal is to restore the pump’s prime and eliminate air or obstructions in the suction path. The best steps are to inspect suction lines for leaks or air pockets, ensure the intake strainer is clear, verify that the priming equipment is working, and then re-prime and bleed as needed. Leaks or air pockets let air be drawn into the line, collapsing the effective suction; a dirty or clogged intake strainer restricts flow and lowers pressure; priming equipment that isn’t functioning prevents establishing a proper prime. Re-priming and bleeding removes trapped air and re-establishes a solid prime, bringing suction pressure back up to normal. Increasing discharge pressure and opening all downstream valves doesn’t fix the underlying suction problem and can cause cavitation or other issues. Ignoring the reading is unsafe and can damage the pump. Closing the intake valve would stop suction altogether and doesn’t diagnose or fix the issue.

When you’re seeing low suction pressure while drafting, the core goal is to restore the pump’s prime and eliminate air or obstructions in the suction path. The best steps are to inspect suction lines for leaks or air pockets, ensure the intake strainer is clear, verify that the priming equipment is working, and then re-prime and bleed as needed. Leaks or air pockets let air be drawn into the line, collapsing the effective suction; a dirty or clogged intake strainer restricts flow and lowers pressure; priming equipment that isn’t functioning prevents establishing a proper prime. Re-priming and bleeding removes trapped air and re-establishes a solid prime, bringing suction pressure back up to normal.

Increasing discharge pressure and opening all downstream valves doesn’t fix the underlying suction problem and can cause cavitation or other issues. Ignoring the reading is unsafe and can damage the pump. Closing the intake valve would stop suction altogether and doesn’t diagnose or fix the issue.