P-201 running but header pressure is low

Inspect

• Ask the operator what changed3 minhint
• Read the HMI alarm banner2 min
• Read the HMI trend and alarm history5 minhint
• Check what work has been done on this skid4 minhint
• Check the day tank level3 min
• Check the suction valve position4 minhint
• Check the discharge control valve and bypass4 minhint
• Listen to the pump and feel for vibration3 minhint
• Remove the guard and inspect the coupling8 minrequires zero energy
• Open the pump and inspect the internals45 minrequires zero energy
• Inspect the motor5 min
• Isolate and open the suction strainer20 minrequires zero energy

Measure

• Read header pressure on the HMI2 min
• Read the local gauge at the header4 minhint
• Read header flow3 minhint
• Measure suction pressure at the pump6 minhint
• Read the strainer differential gauge3 min
• Measure motor current on all three phases7 minhint
• Read the VFD status and fault log4 min
• Compare the VFD speed reference against its output5 minhint
• Check the PLC speed command5 min
• Check the PLC analog input from the transmitter6 minhint
• Measure incoming line voltage6 min

Operate

• Bump the motor and check rotation direction6 minhint

Safety

• Apply lockout/tagout and verify zero energy9 minhint
• Remove lockout and restore power5 min

Repair

• Open the suction valve fully and confirm the stem5 min
• Clean the strainer basket and reassemble25 minrequires zero energy
• Close and chain the manual bypass valve4 min
• Swap two motor leads at the drive to correct rotation20 minrequires zero energy
• Replace the header pressure transmitter30 min
• Replace the spacer coupling40 minrequires zero energy
• Replace the pump impeller and wear ring120 minrequires zero energy
• Correct the speed reference scaling in the PLC12 min

Verify

• Run the pump at duty and confirm pressure and flow8 minhint