65QV-SP Vertical Sump Slurry Pump Test Case

The test case presented in this article is a 65QV-SP vertical sump slurry pump manufactured by Shijiazhuang Minerals Equipment Co., Ltd.

The main information shown on the performance test report is:

A key point in this report is that the test medium was water.

This means that the test was a clean-water performance test, rather than a test using actual mineral slurry.

Clean-water testing is useful for evaluating the basic hydraulic performance of a slurry pump under controlled conditions. However, the results should not be interpreted as identical to the pump's performance when handling a specific slurry.

Why Is Clean Water Used for Slurry Pump Performance Testing?

Clean water is commonly used for pump performance testing because its physical properties are relatively stable and easy to control.

A clean-water test can be used to evaluate basic pump characteristics, including:

• Head at different flow rates
• Power consumption
• Hydraulic efficiency
• The relationship between flow and head
• The general shape of the pump performance curve

For a slurry pump, these measurements provide useful information about the pump's basic hydraulic performance.

However:

A clean-water performance test is not the same as an actual slurry-duty test.

Actual slurry may contain solid particles and have different specific gravity, particle size distribution, concentration, and rheological properties. These factors can affect pump performance, power requirements, wear, and operating conditions.

Therefore, slurry pump selection should always consider the actual slurry characteristics and required system conditions.

What Parameters Are Measured During the 65QV-SP Test?

The 65QV-SP performance test recorded multiple operating points.

Representative data from the report include:

The data show a typical centrifugal pump performance trend:

As flow rate increases, head decreases, while efficiency increases within the tested operating range.

The test points provide the basis for plotting the pump's performance curves.

How to Understand Slurry Pump Flow Rate and Head

Flow Rate

Flow rate indicates the volume of liquid that the pump can move per unit of time.

It is commonly expressed in:

m³/h

In the 65QV-SP test, the measured flow points ranged from zero to approximately 60 m³/h.

Flow rate is one of the most important parameters when selecting a slurry pump because the pump must provide the required capacity at the operating point.

Head

Pump head represents the energy supplied to the fluid by the pump and is commonly expressed in meters.

In the 65QV-SP test:

• Head was approximately 15 m at the low-flow condition.
• Head gradually decreased as flow increased.
• At a flow rate of approximately 60 m³/h, the measured head was about 10.96 m.

This decrease in head as flow increases is a typical characteristic of a centrifugal pump.

Therefore, pump selection should not be based only on a maximum head value. The required flow and corresponding head should be considered together.

What Is Slurry Pump Efficiency?

Pump efficiency indicates how effectively the input power is converted into hydraulic energy delivered to the fluid.

In simple terms:

Higher efficiency generally means that a greater proportion of the input energy is converted into useful fluid energy under the same operating conditions.

Pump efficiency is influenced by many factors, including:

• Hydraulic design
• Impeller geometry
• Pump casing design
• Flow rate
• Rotational speed
• Pump wear
• Fluid properties

In the 65QV-SP clean-water test, efficiency increased as flow increased within the tested range, reaching approximately 36.3% at the highest reported test point.

However, pump efficiency should always be evaluated together with the corresponding flow rate, head, and speed rather than considered as an isolated number.

What Is a Slurry Pump Performance Curve?

A slurry pump performance curve shows how the pump's operating parameters change as flow rate changes.

The most commonly used curves include the following.

Q-H Curve: Flow vs. Head

The Q-H curve shows the relationship between flow rate and pump head.

For a centrifugal pump, the general trend is:

Flow increases → Head decreases

This curve is particularly important when determining whether a pump can provide the required head at the required flow rate.

Q-η Curve: Flow vs. Efficiency

The Q-η curve shows how pump efficiency changes with flow rate.

A pump normally operates more efficiently within a certain operating range. Therefore, the required duty point should be evaluated against the pump's performance curve rather than selecting a pump based on flow or head alone.

Flow-Power Curve

The power curve shows how the pump's power requirement changes with operating conditions.

Power information is important when selecting the motor and checking whether the drive system has sufficient capacity for the intended operating conditions.

How Is a Slurry Pump Performance Test Report Evaluated?

A performance test report normally provides both the measured test data and the specified requirements.

The test report may include items such as:

• Required flow
• Required head
• Required efficiency
• Measured flow
• Measured head
• Measured efficiency
• Operating speed
• Power consumption
• Test result

The actual test data can then be compared with the specified requirements and applicable acceptance criteria.

For the 65QV-SP test shown in this case, the report gives the final result as:

Test Result: Qualified

This indicates that the test was accepted according to the applicable test requirements and acceptance criteria shown in the report.

The specific acceptance criteria should always be considered when interpreting a test result rather than judging performance from a single parameter alone.

How Are Performance Curves Generated From Test Data?

A pump performance curve is based on multiple measured operating points rather than a single test value.

The general process can be summarized as:

Adjust operating condition → Measure flow and pressure → Record speed and power → Calculate head and efficiency → Collect multiple data points → Generate performance curves

For the 65QV-SP test, multiple flow conditions were tested from approximately zero to 60 m³/h.

The measured data were then used to establish the corresponding performance relationships between flow, head, efficiency, and power.

This is why a complete performance test report normally contains multiple test points rather than only one flow and head value.

Why Is a Slurry Pump Performance Test Report Important?

A performance test report provides documented information about the pump's tested operating characteristics.

For customers, it can help answer several practical questions.

1. What operating range was tested?

The report shows the flow points used during the test and the corresponding head and power values.

2. How does pump performance change with flow?

The performance curve provides a visual representation of the relationship between flow, head, efficiency, and power.

3. What was the test condition?

The test medium and other test conditions are recorded in the report.

For this 65QV-SP case:

Test Medium: Water

This clearly indicates that the reported performance data were obtained during a clean-water test.

4. Was the test accepted?

The report records the final test result:

Qualified

This provides documented evidence of the test outcome.

How Does CNSME Conduct Slurry Pump Performance Testing?

For slurry pumps manufactured by Shijiazhuang Minerals Equipment Co., Ltd., clean-water performance testing can be arranged according to customer requirements.

Not every pump is necessarily tested before delivery. When a customer requires performance verification, the pump can be tested at the company's test station using clean water.

During testing, operating parameters can be monitored and recorded, including:

• Flow rate
• Pressure
• Speed
• Power
• Current
• Efficiency

After testing, a corresponding performance test report can be provided, and performance curves can be generated from the recorded test data.

This provides an additional method of verifying pump performance as part of the overall manufacturing and quality-control process.

Pump Quality Control Starts Before Performance Testing

Performance testing is only one part of slurry pump quality control.

The final performance of a slurry pump is influenced by multiple manufacturing processes, including:

Casting → Machining → Component Inspection → Assembly → Dynamic Balancing → Performance Verification

Key components such as the impeller, liners, front and back liner plates, shaft, and pump casing can have a direct impact on the hydraulic performance, mechanical reliability, and service life of the pump.

Therefore, performance testing should be considered as one part of an integrated manufacturing and quality-control process rather than the only method of evaluating pump quality.