What does the service report say?
The report is not a receipt. It is the only place where the pump’s condition is documented in writing, and it is therefore what the next technician, your building owner, and your insurance company will read.
Each checkpoint is assigned one of four statuses:
- Checked and in order – the item has been reviewed with no comments
- Not applicable —the item does not exist or cannot be checked on the model in question, e.g., a sealed oil chamber
- Replaced – the part was replaced during the visit
- Error – something has been detected that requires action
In addition, the report includes the pump’s master data, measured values, photos from the inspection, as well as the date and signature.
The value does not lie in any single report. It lies in the series of reports. A pump whose insulation resistance has steadily decreased over three inspections presents a different problem than a pump whose readings remain stable—and this can only be determined if the reports are comparable.
Does the pump always have to be removed?
During a full service inspection: yes. The impeller, wear rings, pump housing, cable gland, and lifting chain cannot be inspected while the pump is submerged in the fluid.
However, it is possible to arrange for lighter inspections between the full inspections, during which operation, controls, levels, and alarms are checked without hoisting the pump out of the water. This is a less expensive and faster inspection, and for some systems, this combination makes sense: ongoing inspections throughout the year and one thorough annual inspection during which the pump is removed.
But the two should not be confused. An inspection identifies operational faults. A maintenance check identifies wear and tear. If an inspection is chosen simply because it is the easiest option, the wear and tear will not be detected until capacity is lost.
The scope and frequency should be determined based on:
- Pump Type and Installation
- The fluid the pump handles
- Operating Hours and Load
- The Consequences of a System Outage
- Past Problems and Repairs
- Your own documentation requirements
What makes dry-mounted pumps different?
The discussion above focuses on submersible pumps in wells or pumping stations, as this is the most common configuration in wastewater and drainage systems.
If the pump is a dry-mounted wastewater pump, a centrifugal pump on a foundation, or a process pump, the items regarding the guide tube, base plate, and lifting chain do not apply. Instead, other items are added: alignment between the motor and the pump, the condition of the coupling, bearings and bearing temperature, shaft seal or stuffing box, vibration level, and the condition of the suction line and any foot valve.
The logic is the same: functional testing first, mechanical inspection, then electrical and control systems, and documentation last.
How often should inspections be performed?
The interval is determined based on the medium, operating hours, and how critical the pump is—not based on a standard template. An annual service inspection is a common starting point, but it is just a starting point, not a definitive answer.
Clean water and light wastewater, moderate operation
In this case, an annual inspection is typically sufficient. The important thing is that it is actually carried out and that the report can be compared with last year’s.
Wastewater high in fat or high in fiber
Deposits and clogging determine the service interval. In this case, the inspection is just as much about removing buildup as it is about measuring the wear on the pump.
Slurry, sand, and abrasive media
Wear on the impeller and wear rings occurs significantly faster. It is typically in this area that more frequent maintenance pays for itself directly in terms of energy consumption and capacity.
Continuous operation or critical function
Operating hours provide a better basis than the calendar. In the case of critical operations, the interval should also be considered in light of whether a backup pump is available or whether access to a loaner pump is possible.
Facility with surveillance
If the pump is connected to level sensors, alarms, and SRO, maintenance can shift from being schedule-based to condition-based. Inspections don’t disappear—but they can be scheduled based on what the data shows, rather than on when the last inspection was performed.
