A standby pump can show a run signal and still deliver too little water. The repair is ready for handover when it can meet its duty under a controlled test and the site’s protections are available.
Follow the site work sequence
- Coordinate. Operations and maintenance agree on the outage, treatment continuity, permit, and responsible people.
- Isolate and verify. Authorized staff apply the site’s hazardous-energy procedure and verify isolation and stored-energy control. A stop command provides only operating status. Treat tank and pit access under the site’s confined-space program.
- Restore and test. Authorized staff clear the work area, restore safeguards, and follow the approved return-to-service test. Record the before and after readings and the operations handover.
One pump, two readings
ET-01’s example test band is 76–84 m³/h at approximately 22 m head. Pump P-102B gives 52 m³/h at 22 m before the work, so it is recorded as unavailable for that duty. After an authorized correction to a suction restriction, it gives 79 m³/h at the same head. That meets the example flow criterion. The team verifies the remaining conditions and protections before the responsible person signs off.
Further reading · OSHA technical reference on hazardous-energy control
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