SUBMERSIBLE BOREHOLE PUMP TESTING IN KENYA
PRO-LOGIC TECHNOLOGIES LIMITED | CALL 0723763173
Submersible borehole pump testing is an important technical procedure for assessing the operation, water delivery, electrical condition and overall performance of a borehole pumping system. Whether you have installed a new submersible pump, replaced an old pump, experienced reduced water flow or need to investigate recurring breakdowns, appropriate testing helps establish the condition of the equipment and determine the next steps.
Pro-Logic Technologies Limited provides technical assistance for borehole pumping-system assessments, pump performance testing enquiries, troubleshooting and maintenance planning in Kenya. Our focus is helping customers understand the relationship between the borehole, submersible pump, electrical control equipment and water distribution system.
A borehole pump may appear to operate normally while delivering less water than expected. In other cases, the motor may fail to start, the electrical protection may trip, the storage tank may take too long to fill or the pump may stop during prolonged operation. These symptoms can arise from different causes, including electrical faults, mechanical wear, excessive pumping head, groundwater limitations and delivery pipe restrictions.
A structured assessment helps distinguish between these possibilities and reduces the risk of replacing equipment unnecessarily.
For enquiries about submersible borehole pump testing, contact Pro-Logic Technologies Limited on 0723763173.
Website: https://prologictecnologies.co.ke
1. What Is Submersible Borehole Pump Testing?
Submersible borehole pump testing is the process of examining how a pump and its associated installation perform under specified operating conditions. A submersible pump is installed below the water level and pushes water through a delivery pipe to the surface or another required delivery point.
Unlike a surface-mounted pump, a submersible pump operates within the borehole or another submerged installation. This arrangement makes it particularly suitable for deep groundwater applications, but it also means that diagnosing faults can require measurements from the surface and, in some circumstances, inspection of the equipment after removal.
A proper assessment considers more than whether the motor starts. It may include measurements of discharge rate, delivery pressure, pumping water level, voltage, current, operating duration and the behaviour of the control system.
The appropriate tests depend on the reason for the investigation.
For example, testing a newly installed pump may focus on commissioning, electrical protection, flow rate and delivery pressure. Investigating a pump that repeatedly trips may require a more detailed electrical assessment. A borehole that has experienced declining water production may require both pump performance testing and a separate groundwater-yield investigation.
The distinction is important because a pump can be mechanically sound while the borehole produces insufficient water. Similarly, a borehole may contain adequate groundwater while a damaged pump or restricted pipe prevents sufficient delivery.
2. Why Is Submersible Borehole Pump Testing Important?
Confirming correct pump operation
Testing establishes whether the pump starts, runs and delivers water under the conditions expected for the installation.
The measured discharge can be compared with the manufacturer's performance curve at the relevant total dynamic head. This comparison helps determine whether the pump is operating within its intended range.
The rated flow printed on a pump is not necessarily the flow that will be delivered at every installation. Actual performance depends on the pump design, water level, delivery elevation, pipe losses and pressure requirements.
Identifying electrical problems
Submersible pumps depend on an appropriate electrical supply, correctly sized cables and suitable motor-control equipment.
Electrical faults can cause failure to start, overheating, repeated tripping, unstable operation or damage to motor windings.
Depending on the system, testing may include supply voltage, current, phase conditions, insulation resistance and control-panel operation. These measurements must be interpreted using the motor specifications and appropriate testing procedures.
Detecting reduced water production
A decline in discharge may indicate pump wear, a blocked intake, pipe restrictions, leakage, an unsuitable operating point or a change in groundwater conditions.
Comparing current readings with previous measurements can help identify whether performance has deteriorated.
Where groundwater availability is suspected, the assessment should include water-level measurements and consideration of the borehole's response to pumping.
Reducing unnecessary pump replacement
Replacing a submersible pump without identifying the actual fault may not solve the problem.
For example, a pump that appears weak may be operating against excessive head, supplying water through a restricted pipe or drawing from a borehole whose water level has fallen.
Testing helps determine whether the next step should involve electrical repairs, pump servicing, pipework correction, changes to operating conditions or replacement equipment.
Improving reliability
Homes, farms, institutions and commercial properties may depend on borehole water for daily operations.
Maintaining records of flow, pressure, water levels and electrical readings helps establish a baseline against which future performance can be compared.
These records support preventive maintenance and can reveal changes before a minor fault develops into a major interruption.
3. Understanding the Main Components of a Submersible Pump System
To understand pump testing, it is useful to identify the major components and their functions.
The submersible pump assembly
The pump assembly moves water from the borehole into the delivery pipe. Many borehole pumps use multiple stages, with impellers and diffusers arranged to generate the pressure needed to lift water through the system.
The design and materials vary according to the pump model and application.
Internal wear, damaged components, debris or operating outside the manufacturer's recommended range may affect performance. The exact diagnosis depends on the pump design and measured operating conditions.
The electric motor
The motor drives the pump assembly. It must operate within its specified electrical and thermal limits.
Motor problems may involve damaged windings, insulation deterioration, bearing-related issues in applicable designs or damage associated with prolonged abnormal operation.
Electrical measurements can indicate that a motor requires further investigation, but a single reading rarely establishes the exact internal failure.
The power cable
The cable supplies electricity to the submerged motor. It must be suitable for the voltage, current, installation depth and operating environment.
Cable damage, poor joints or deteriorated insulation can create electrical faults and may contribute to motor failure.
Testing should be performed using appropriate instruments and procedures, with the equipment safely isolated.
The delivery pipe
The delivery pipe carries water from the pump to the surface and onward to the storage or distribution system.
Its diameter, length, fittings and condition affect hydraulic losses. Leaks, blockages and restricted valves may reduce the amount of water reaching the delivery point.
The control panel
The control panel provides starting, stopping and protection functions. Depending on the installation, it may contain a motor starter, contactors, overload protection, monitoring equipment, level controls or a variable-frequency drive.
A faulty control panel can prevent a sound pump from starting or cause the motor to stop unexpectedly.
Water-level protection
Low-water or dry-running protection can stop a pump when water availability becomes insufficient or when the system detects conditions associated with unsafe operation.
The protection arrangement must be appropriate for the installation. Repeated activation should be investigated rather than bypassed.
Storage and distribution equipment
The pump may supply a storage tank, pressure vessel, irrigation network or direct distribution system.
Faults in these components can affect pressure, cycling and the apparent performance of the pump. The full installation should therefore be considered during diagnosis.
4. Initial Inspection Before Testing
A structured inspection helps identify obvious problems before detailed measurements are taken.
The technician should establish the reason for the test and gather information about the pump's history.
Useful information includes the pump model, motor rating, installation depth, borehole depth, delivery pipe dimensions, expected flow rate, control-panel configuration and any previous test reports.
The inspection should also consider whether the system has undergone recent repairs or modifications.
Review the installation records
Pump selection should be supported by information about the intended discharge, total dynamic head and borehole yield.
If the available records are incomplete, the technician may need to obtain measurements before deciding whether the pump is suitable.
Inspect accessible equipment
The accessible parts of the installation may be checked for loose connections, damaged cables, leakage, corrosion, unusual noise and signs of overheating.
The control panel should be assessed against the pump manufacturer's documentation.
Confirm the operating requirements
The technician should establish the required water demand and delivery conditions.
A domestic borehole supplying a storage tank has different requirements from an irrigation installation supplying multiple distribution lines.
Understanding the intended use helps determine which measurements matter most.
5. Electrical Testing of Submersible Borehole Pumps
Electrical testing helps determine whether the supply, cable, motor and control equipment operate within the required limits.
Because the equipment may be connected to mains electricity, these checks should be carried out by a qualified technician using suitable instruments and safe isolation procedures.
Supply voltage
Supply voltage should be measured at appropriate points and compared with the motor's nameplate and manufacturer specifications.
Voltage outside the permitted range may affect motor operation, heating and performance.
A voltage problem may originate in the incoming supply, cable sizing, connections or other parts of the installation.
Motor current
Operating current provides useful information about the electrical load on the motor.
The reading should be compared with the rated current and interpreted alongside the pump's operating conditions.
High current may be associated with overload, mechanical problems, unsuitable operating conditions or electrical faults. Low current may also require investigation, depending on the motor and hydraulic load.
Current alone does not identify a particular failed component.
Phase conditions
Three-phase installations require appropriate phase conditions and motor protection.
Phase loss, incorrect connections or supply imbalance can cause abnormal motor operation and overheating.
The control panel and supply should be assessed according to the applicable electrical requirements and manufacturer instructions.
Insulation resistance
Insulation-resistance testing may help assess the condition of motor and cable insulation.
The equipment must be disconnected and prepared correctly before the test. Electronic controls, sensors and other components must be handled in accordance with their specifications because inappropriate test voltages can damage them.
A low insulation-resistance reading requires interpretation based on the circuit configuration, test conditions and manufacturer requirements.
Cable continuity and connections
Where appropriate, continuity testing can help identify an open conductor or defective connection.
The cable and joints should also be inspected for physical damage and signs of deterioration.
Any repair must maintain suitable insulation, mechanical protection and environmental sealing.
Control-panel testing
The control panel should be checked for correct operation of the starter, contactors, overload protection and any installed monitoring devices.
The control sequence should be compared with the wiring diagram.
Repeated tripping should prompt investigation of the reason for the trip. Protection settings must not be increased arbitrarily or bypassed to keep the motor running.
6. Hydraulic Testing of Submersible Pumps
Hydraulic testing assesses the movement of water through the pump and delivery system.
The main measurements usually include discharge, pressure and, where relevant, pumping water level.
Measuring discharge
Discharge is the quantity of water delivered per unit of time.
It may be expressed in litres per second or cubic metres per hour.
A suitable flow meter or another appropriate calibrated method can be used to measure discharge. The method should be appropriate for the flow range and installation.
Measurements should be recorded together with the operating conditions so that changes can be interpreted.
Measuring delivery pressure
Pressure measurement helps establish whether the system supplies water at the required pressure.
The location of the pressure measurement matters. Pressure measured near the pump outlet may differ from pressure measured at a distant delivery point because of elevation changes, friction losses and other system characteristics.
Pressure should be interpreted alongside discharge rather than in isolation.
Measuring pumping water level
Where appropriate, the water level is measured during operation.
The difference between the static water level and pumping water level is known as drawdown.
A falling water level can increase the head against which the pump operates. If the water level approaches the pump intake or the system's safe operating limit, low-water protection may activate.
Monitoring operating stability
The technician should observe whether discharge and pressure remain reasonably stable under the selected conditions.
Changes may indicate varying groundwater availability, a control-system problem, a restriction or another issue requiring investigation.
The length of the observation period should be suitable for the objective of the test.
7. Understanding Total Dynamic Head
Total dynamic head is one of the most important considerations when testing and selecting a borehole pump.
It represents the total energy per unit weight that the pump must provide to move water through the system.
In a typical installation, the calculation considers the elevation difference between the pumping water level and the delivery point, the required pressure at the destination, and the friction losses in pipes and fittings.
The relevant pumping water level is particularly important. Using the total borehole depth as though it were the actual pumping lift can result in an incorrect calculation.
Static lift and pumping lift
The static water level is measured before pumping begins, after sufficient recovery where possible.
The pumping water level is measured while the pump operates.
The pumping lift may be greater than the static lift because the water level can fall during pumping.
For pump selection and performance assessment, the actual operating conditions must be considered.
Friction losses
Water moving through pipes loses energy because of friction and changes in direction.
Pipe diameter, pipe length, flow rate, fittings and valve configuration all influence these losses.
An installation with undersized or restricted pipework may deliver less water than expected even when the pump is in good condition.
Required delivery pressure
If the water must reach an elevated tank or a distribution network requiring a specified pressure, the pump must provide sufficient head to meet that requirement.
The pump should be selected using the relevant performance curve and the total system requirements.
8. Comparing Measured Performance with the Pump Curve
A pump performance curve describes the relationship between discharge and head for a particular pump under specified conditions.
The curve helps determine the expected operating point for the installation.
A pump's nominal flow rate should not be treated as a guaranteed discharge at every head.
What a lower-than-expected flow rate may indicate
Possible explanations include excessive head, restrictions, leakage, internal wear, an incorrect pump model or insufficient groundwater availability.
The technician should compare the measured operating point with the manufacturer's curve and assess the rest of the system.
Why the operating point matters
A pump is designed to operate within a specified performance range.
Operating far outside the recommended range can affect efficiency, stability and equipment life.
Correcting the problem may require changing the operating conditions, repairing restrictions or selecting a more suitable pump.
Why manufacturer specifications matter
Pump models differ in impeller design, stage count, motor rating, permitted operating range and construction.
The correct specifications should be obtained for the exact model whenever possible.
Generic voltage, current or flow figures should not be used as universal acceptance limits.
9. Submersible Pump Testing After Installation
Testing after installation helps establish whether the equipment and associated systems operate as intended.
The process should include a review of the installation records, inspection of accessible components and suitable operational measurements.
Confirm the pump model and rating
The installed pump should be compared with the documented selection.
The model, motor rating and intended operating range should be verified against the requirements of the borehole.
Check the delivery arrangement
The delivery pipe, valves and accessible connections should be inspected for leaks or restrictions.
Any changes to pipe diameter, route or fittings should be considered when interpreting the measured flow.
Confirm protection arrangements
Where fitted, low-water protection, overload protection and other safety devices should be checked according to the manufacturer's instructions.
Record the initial performance
The commissioning record should include the measurements taken, operating conditions, any adjustments and outstanding issues.
These values become a reference for future maintenance.
10. Testing a Submersible Pump That Fails to Start
A pump that fails to start may have a fault in the power supply, cable, control panel, motor or protection system.
The diagnosis should begin with the external electrical and control arrangements before assuming that the submerged pump must be removed.
Check the reported symptoms
Determine whether the pump is completely unresponsive, whether a breaker trips immediately, whether a contactor operates, or whether a controller displays a fault.
These observations help narrow the possible causes.
Check the supply and control sequence
A qualified technician should verify the incoming supply and the control panel's operation.
The measurements should follow the wiring diagram and equipment specifications.
Investigate protection activation
A protection device may be responding to an actual fault rather than failing itself.
The reason for activation must be identified before resetting the system repeatedly.
Determine whether removal is necessary
If external electrical and control checks indicate a fault in the submerged motor or pump assembly, further testing or removal may be required.
Removal should be performed using appropriate lifting equipment and safe procedures.
11. Testing a Pump That Runs but Delivers No Water
A running motor does not prove that the pump is delivering water correctly.
Possible causes include a blocked delivery line, a damaged pump assembly, an unavailable water supply at the intake or an installation problem.
Confirm the water level
If the pumping water level has fallen too far, the pump may not have sufficient water available for normal operation.
The condition should be investigated using suitable water-level measurements.
Inspect the delivery line
Accessible pipework, valves and connections should be checked for leakage or obstruction.
A leak below ground or within the borehole may require more detailed investigation.
Review pump selection
The pump may be unsuitable for the actual head and delivery requirements.
The manufacturer's performance curve should be reviewed against the operating conditions.
Avoid prolonged abnormal operation
A pump operating without adequate water or under unsuitable conditions may be damaged.
Follow the manufacturer's operating instructions and stop the system if required by its protection arrangements.
12. Testing a Submersible Pump with Low Water Flow
Low flow is a common reason for investigating a borehole pumping system.
The cause may be mechanical, electrical, hydraulic or groundwater-related.
Establish the actual discharge
Measure the current flow rate and compare it with previous records and the expected operating point.
A reliable baseline makes it easier to identify changes.
Check the pumping water level
If the water level falls significantly during pumping, the borehole may be unable to sustain the selected pumping rate under the tested conditions.
A separate yield assessment may be necessary.
Examine the pump and pipework
If groundwater availability appears adequate, investigate possible pump wear, restrictions, leakage and excessive head.
Review the control settings
In installations with adjustable controls, the operating settings should be checked against the pump and motor specifications.
Changes should be made only when supported by the equipment documentation and measurements.
13. Testing for Submersible Pump Overheating
Overheating may result from electrical problems, unsuitable operating conditions, inadequate cooling or internal damage.
The exact causes depend on the motor design and installation.
Possible contributing factors
These may include excessive current, abnormal voltage, unsuitable duty, repeated starting, inadequate cooling conditions or a mechanical fault.
Measurements and inspection
Electrical readings should be compared with the motor rating. The installation should also be reviewed against the manufacturer's cooling and operating requirements.
If the pump repeatedly overheats or activates thermal protection, it should not be forced to continue operating.
Corrective action
The corrective action depends on the findings and may involve electrical repairs, correcting operating conditions, servicing or replacement of damaged components.
14. Testing Submersible Pump Control Panels
The control panel is responsible for managing the operation of the pumping system.
Depending on its design, it may include a motor starter, contactors, overload relays, level controls, pressure switches, timers, monitoring equipment or a variable-frequency drive.
Motor starter and contactors
These components control the connection of the motor to the electrical supply.
Their condition should be checked according to the equipment specifications and applicable safety procedures.
Overload protection
Overload protection should be configured to match the motor rating and manufacturer's requirements.
A repeated overload trip requires investigation rather than an arbitrary increase in the setting.
Level controls
Level controls may stop the pump when water availability becomes insufficient or when a specified level is reached.
Their operation should be checked against the system's design.
Pressure controls
Pressure switches and other pressure-control devices may govern pump starting and stopping in relevant installations.
Incorrect settings or defective components can cause unstable operation.
Variable-frequency drives
Where a drive is installed, diagnosis may involve reviewing fault codes, configuration, operating frequency, current and other recorded parameters.
Drive settings should be checked against the motor and pump requirements. Incorrect adjustment can cause poor performance or equipment stress.
15. Testing Submersible Pump Cables
Submersible pump cables operate in demanding conditions and must be suitable for the electrical load and installation environment.
Cable-related faults can cause the pump to stop, trip protection or fail insulation-resistance checks.
Visual inspection
Accessible cable sections and connections should be examined for physical damage, poor joints and signs of overheating.
Submerged connections require appropriate construction and sealing.
Continuity testing
Where appropriate, continuity measurements can identify an open conductor.
The circuit must be isolated and prepared correctly before testing.
Insulation testing
Insulation-resistance testing can help assess insulation condition when performed using the correct procedure and instrument.
Sensitive electronics must be disconnected or protected according to the manufacturer's instructions.
Cable sizing and voltage drop
Cable size should be appropriate for the motor current, voltage, cable length and installation requirements.
Excessive voltage drop can affect motor operation. The design should be reviewed when the measured voltage at the motor differs significantly from the expected value.
16. Testing Submersible Pump Motors
Motor testing helps assess the electrical condition of the motor and its suitability for continued operation.
The exact procedure depends on the motor type and manufacturer's instructions.
Review the motor nameplate
The nameplate provides essential information such as rated voltage, current, power and other operating specifications.
These details should be used when interpreting measurements.
Compare current readings
Measured operating current should be assessed against the rating and operating conditions.
An abnormal reading may indicate overload, electrical problems or a change in hydraulic loading.
Assess insulation condition
Appropriate insulation-resistance testing can provide information about the condition of the electrical insulation.
Results must be interpreted in context and compared with the applicable specifications.
Consider internal damage
If measurements and symptoms suggest an internal motor fault, further specialist inspection may be necessary.
Repairability depends on the motor design, damage and availability of suitable components.
17. Borehole Pump Testing and Groundwater Availability
The pump and the groundwater source work together, but they are not the same thing.
A pump can only deliver water that is available under the prevailing borehole and aquifer conditions.
If the pumping rate exceeds the sustainable supply under the tested conditions, the water level may fall excessively and the system may activate low-water protection.
Static water level
The static water level provides a baseline before pumping.
It can vary with seasonal groundwater conditions and other influences.
Pumping water level
The pumping water level is measured during operation.
Its change relative to the static level provides the drawdown.
Recovery
After pumping stops, the water level may recover towards its pre-pumping level.
Recovery measurements help assess groundwater response and should be interpreted alongside discharge and pumping duration.
Sustainable operating rate
A sustainable operating rate cannot be determined reliably from a single brief observation alone. It requires appropriate interpretation of pumping measurements and the hydrogeological conditions.
Where necessary, a dedicated groundwater-yield investigation should be undertaken.
18. Step-Drawdown Testing for Borehole Pumps
A step-drawdown test examines how the borehole responds to progressively different pumping rates.
It can help establish how drawdown changes as discharge increases and provide information for selecting an appropriate operating rate.
Planning the test
The test should be designed around the borehole's characteristics, intended use and applicable technical requirements.
The equipment and measurement methods should be suitable for the expected discharge and water-level range.
Recording the results
At each step, the discharge and water level are recorded at appropriate intervals.
The observations help establish the relationship between pumping rate and drawdown.
Interpreting the findings
The results should be interpreted by a suitably qualified professional using the relevant hydrogeological information.
The highest short-term flow rate should not automatically be treated as the recommended continuous operating rate.
19. Constant-Rate Pumping Tests
A constant-rate pumping test maintains a controlled discharge while the water level is monitored over time.
This type of test helps evaluate borehole and aquifer response under the selected conditions.
Purpose of the test
The test can help assess drawdown behaviour, changes over time and the suitability of a proposed pumping rate.
Importance of consistent measurements
Discharge and water levels should be measured and recorded accurately throughout the test.
Changes in the pumping rate or other conditions should be documented because they affect interpretation.
Test duration
The appropriate duration depends on the investigation's objectives, hydrogeological setting and applicable requirements.
A short operational test should not be presented as equivalent to a properly designed constant-rate test.
20. Recovery Testing After Pumping
Recovery testing records the rise in water level after pumping stops.
The observations provide additional information about how the borehole responds after groundwater withdrawal.
Why recovery matters
Recovery measurements can help identify changes in borehole behaviour and complement pumping-test results.
What slow recovery may indicate
Slow recovery can be associated with aquifer characteristics, the preceding pumping conditions or changes in groundwater availability.
It does not, by itself, prove that the pump is damaged or that the borehole has failed.
Interpreting the measurements
Recovery data should be considered alongside pumping duration, discharge, drawdown and historical records.
Further hydrogeological assessment may be appropriate if the findings indicate a significant change.
21. Testing Submersible Pumps for Residential Water Supply
Residential boreholes often supply houses, apartments, gated communities and other developments.
The pumping system may fill storage tanks or supply a pressure-distribution network.
Assessing daily water demand
The expected demand depends on the number of occupants, water-use habits and available storage.
Testing helps establish whether the pump and borehole can meet the intended requirements under the relevant operating conditions.
Evaluating tank-filling performance
Tank-filling time can provide a useful operational observation, but it should be interpreted alongside the tank's usable capacity and actual measured discharge.
A long filling time may be associated with low flow, leakage, excessive head or limited groundwater availability.
Pressure and distribution
If the installation supplies multiple outlets, the assessment should consider the required pressure and the losses in the distribution network.
Planning maintenance
Recording operating readings provides a reference for future checks.
Changes in flow, pressure or electrical behaviour can prompt timely investigation.
22. Testing Submersible Pumps for Irrigation
Irrigation systems may require particular flow rates and pressures depending on the crop, irrigation method and distribution arrangement.
Matching pump output to irrigation demand
The measured flow and pressure should be compared with the irrigation system's requirements.
Checking pipework and valves
Restrictions, leakage and incorrect valve arrangements may affect the delivered flow.
Considering seasonal groundwater conditions
Groundwater availability can change, so the pumping rate should be reviewed where water levels or discharge change significantly.
Avoiding excessive pumping
A pump should not withdraw water faster than the borehole can sustainably supply under the relevant conditions.
Where groundwater availability is the limiting factor, changing the pump alone will not solve the problem.
23. Testing Submersible Pumps for Commercial and Industrial Use
Commercial and industrial facilities may use borehole water for sanitation, cleaning, processing, cooling or other activities.
The appropriate testing programme depends on the importance of the supply and the operating requirements of the site.
Assessing operating duty
The pump's expected operating hours, starting frequency, required flow and delivery pressure should be reviewed.
Checking system reliability
Performance records help establish whether the pump is operating consistently.
Repeated trips, abnormal current or declining flow should be investigated promptly.
Maintaining operational records
Records should include pump specifications, test results, repairs and relevant operating conditions.
These records support maintenance planning and help identify recurring faults.
24. Common Mistakes During Submersible Pump Testing
Incorrect testing can lead to misleading conclusions or damage to equipment.
Assuming that a running motor means the pump is healthy
A running motor may still be connected to a damaged pump assembly or an obstructed delivery system.
Discharge and pressure must be evaluated.
Using borehole depth as the only pump-selection measurement
Total borehole depth does not equal the pumping lift. The pumping water level and delivery requirements are essential.
Ignoring electrical specifications
Measurements should be compared with the exact motor rating and manufacturer's requirements.
Generic limits may be inappropriate for a particular model.
Repeatedly resetting protection devices
Repeated tripping indicates that a fault may be present. The underlying cause should be investigated before operation continues.
Increasing pump capacity without testing yield
A larger pump cannot create additional groundwater and may worsen drawdown.
Treating one measurement as a complete diagnosis
A single pressure, current or flow reading rarely identifies the entire problem.
Measurements should be interpreted together with the installation details and observed symptoms.
25. Preparing for a Professional Submersible Pump Assessment
Preparing the relevant information can help the technician plan an appropriate test.
Useful details include:
- Borehole location.
- Borehole depth and construction records, if available.
- Pump make and model.
- Motor voltage, power and rated current.
- Pump installation depth.
- Delivery pipe diameter and approximate length.
- Storage tank capacity and intended use.
- Current discharge and pressure, if known.
- Description of the fault.
- Previous repair and maintenance records.
If some records are missing, the initial assessment can establish what further measurements are needed.
26. How Testing Supports Pump Maintenance Planning
Testing provides information that can guide maintenance decisions.
If discharge and pressure remain within the expected operating range and electrical measurements are satisfactory, routine monitoring may be appropriate.
If measurements show a decline in performance, further investigation may be required.
The response should be proportionate to the findings. Not every abnormal reading requires immediate pump replacement, but unexplained deterioration should not be ignored.
Maintaining a baseline
The original commissioning readings provide a reference for future comparisons.
Recording changes
Changes in flow, pressure, water level or current may indicate a developing problem.
Scheduling further inspection
The frequency of follow-up checks should reflect the system's operating conditions, maintenance history and importance of the water supply.
27. Safety During Submersible Pump Testing
Submersible pump testing involves electrical equipment, water, heavy lifting and potentially pressurised pipework. Safe procedures are essential.
Electrical isolation
Before working on wiring, the control panel or pump connections, the equipment must be isolated and verified safe using appropriate procedures.
Qualified personnel
Live electrical measurements and internal motor tests should be carried out by suitably qualified technicians.
Safe lifting
Submersible pumps and long pipe assemblies may be heavy. Removal requires appropriate lifting equipment, secure handling and suitable procedures.
Pressure safety
Before opening relevant pipework, isolate the system and release pressure using the appropriate procedure.
Environmental protection
Testing discharge should be directed safely to a suitable location without causing erosion, flooding or damage.
Manufacturer requirements
The pump's installation and testing instructions should be followed throughout the assessment.
28. When Is Pump Removal Necessary?
Not every fault requires removal of the submerged pump.
External checks may identify a problem with the power supply, control panel, accessible pipework or operating conditions.
Removal may be necessary when evidence indicates internal pump or motor damage, a submerged cable fault or another problem that cannot be adequately diagnosed from the surface.
The decision should be based on the symptoms, measurements, installation records and cost of further investigation.
Before removal, the technician should plan for safe lifting, handling, inspection and reinstallation.
29. Repair or Replace a Submersible Borehole Pump?
The decision depends on the pump's condition, the type of fault, compatible parts availability, repair cost and expected reliability.
When repair may be suitable
Repair may be reasonable when the fault is limited to a serviceable component or when the pump remains in otherwise suitable condition.
When replacement may be preferable
Replacement may be appropriate when the assembly is extensively damaged, suitable parts are unavailable or the repair is uneconomical.
Reassess pump selection
Before replacing the pump, confirm that the replacement is appropriate for the borehole's sustainable yield and total dynamic head.
A replacement with a different rating may change the operating point and should be selected using the manufacturer's performance data.
30. Frequently Asked Questions About Submersible Borehole Pump Testing
What is submersible borehole pump testing?
It is the assessment of a submerged pumping system using appropriate measurements of discharge, pressure, electrical behaviour and, where relevant, water levels.
Why is testing necessary after installation?
Testing helps verify that the pump and associated controls operate correctly and that the delivered water meets the installation's requirements.
Can testing identify a damaged motor?
Electrical measurements may indicate a motor problem, but additional tests and inspection may be required to confirm the exact fault.
Why does my submersible pump deliver less water than expected?
Possible causes include pump wear, excessive head, pipe restrictions, leakage, electrical problems or insufficient groundwater availability.
Can a pump operate while the borehole has insufficient yield?
Yes. A pump may initially run while the water level declines. Appropriate low-water protection and monitoring can help reduce the risk of damage.
Is submersible pump testing the same as borehole yield testing?
No. Pump testing focuses on the equipment and its operating conditions. Yield testing examines the borehole's response to groundwater withdrawal. Both may be needed.
How can I tell whether the pump or borehole is causing low flow?
Measure discharge and pressure, assess electrical performance and monitor the pumping water level. The combined findings help distinguish equipment faults from groundwater limitations.
Can testing reduce pump failures?
Testing can identify abnormal operating conditions and support preventive maintenance. It cannot eliminate every failure, but it can improve fault detection and maintenance planning.
How often should a submersible pump be tested?
The frequency depends on the system's duty, condition, water demand and maintenance history. Testing is particularly useful after installation, significant repairs or changes in performance.
How do I arrange submersible borehole pump testing in Kenya?
Contact Pro-Logic Technologies Limited on 0723763173 or visit https://prologictecnologies.co.ke to discuss your installation and testing requirements.
31. Contact Pro-Logic Technologies Limited
A reliable borehole pumping system depends on appropriate equipment selection, correct installation, suitable electrical protection and regular performance assessment.
Submersible borehole pump testing helps establish whether the equipment is delivering the required water, operating within its specifications and responding appropriately to the borehole's conditions.
For enquiries about submersible pump testing, pumping-system performance assessment and fault diagnosis, contact:
Company: Pro-Logic Technologies Limited
Phone: 0723763173
Website: https://prologictecnologies.co.ke
Discuss your borehole pump's symptoms, installation details and water-supply requirements with Pro-Logic Technologies Limited to determine the appropriate next steps.
A properly planned assessment helps you make informed decisions about maintenance, repair, pump selection and reliable water delivery.