Common Dosing-Pump Problems and Troubleshooting Guide

Overview

Troubleshoot dosing pump problems including no flow, low flow, leakage, pulsation, air lock, cavitation, valve blockage and loss of pressure.

Common Dosing-Pump Problems and Troubleshooting Guide is an important engineering topic because poor selection can increase downtime, chemical use, maintenance cost and process instability.

Table of Contents

• Pump Runs but Delivers No Flow
• Low Flow
• Loss of Prime
• Excessive Pulsation
• Leakage
• Abnormal Noise
• Overpressure
• Crystallization
• Inaccurate Flow
• Troubleshooting Method
• Practical Checklist
• Frequently Asked Questions

Pump Runs but Delivers No Flow

Check tank level, priming, suction valve, air lock, closed valves and wrong rotation.

For final selection, use actual minimum, normal and maximum operating conditions rather than one average value. Many site problems occur because start-up, low level, final concentration or maximum pressure was not checked.

Low Flow

Inspect suction restrictions, viscosity, valve wear, pressure and stroke setting.

Any engineering assumption should be stated clearly in the technical offer so that the buyer and supplier can verify suitability before fabrication.

Loss of Prime

Air leaks, gas release, suction lift and low tank level are common causes.

Installation, operation and maintenance also affect performance. Correctly selected equipment may still fail when piping, support, alignment, liquid level or control philosophy differs from the design basis.

Excessive Pulsation

Check dampener sizing, back pressure, pipe supports and stroke speed.

For final selection, use actual minimum, normal and maximum operating conditions rather than one average value. Many site problems occur because start-up, low level, final concentration or maximum pressure was not checked.

Leakage

Identify whether leakage comes from fittings, packing, diaphragm, valves or relief piping.

Any engineering assumption should be stated clearly in the technical offer so that the buyer and supplier can verify suitability before fabrication.

Abnormal Noise

Investigate cavitation, check-valve chatter, bearings, misalignment and blocked discharge.

Installation, operation and maintenance also affect performance. Correctly selected equipment may still fail when piping, support, alignment, liquid level or control philosophy differs from the design basis.

Overpressure

A closed valve or blocked injection point can cause rapid pressure rise.

For final selection, use actual minimum, normal and maximum operating conditions rather than one average value. Many site problems occur because start-up, low level, final concentration or maximum pressure was not checked.

Crystallization

Some chemicals dry or crystallize in valves and tubing. Flushing may be required.

Any engineering assumption should be stated clearly in the technical offer so that the buyer and supplier can verify suitability before fabrication.

Inaccurate Flow

Calibrate at actual pressure and inspect valves and suction conditions.

Installation, operation and maintenance also affect performance. Correctly selected equipment may still fail when piping, support, alignment, liquid level or control philosophy differs from the design basis.

Troubleshooting Method

Change one condition at a time and record flow, pressure, stroke, speed and chemical condition.

For final selection, use actual minimum, normal and maximum operating conditions rather than one average value. Many site problems occur because start-up, low level, final concentration or maximum pressure was not checked.

Practical Checklist

• Define the exact process objective.
• Confirm minimum, normal and maximum conditions.
• Verify material compatibility.
• Check flow, pressure, torque or power as applicable.
• Include safety devices, alarms and interlocks.
• Request drawings, datasheets and assumptions.
• Verify actual performance during commissioning.

Why Work With Premix Technologies?

Premix Technologies manufactures industrial agitators, dosing pumps and complete chemical dosing systems for water treatment, chemicals, pharmaceuticals, food processing, oil and gas, mining and other process industries.

Explore our industrial agitators, dosing pumps and chemical dosing systems, or contact Premix Technologies.

Frequently Asked Questions

Can equipment be selected only from capacity?

No. Process properties, pressure, geometry, materials and operating range must also be checked.

Why are maximum conditions important?

Equipment may perform correctly at normal conditions but fail at peak pressure, maximum viscosity or low level.

Should the supplier state design assumptions?

Yes. Clear assumptions reduce technical risk and make review easier.

Is oversizing always safer?

No. Oversizing can reduce controllability, increase loading or waste energy.

Why is calibration or commissioning verification required?

Actual site conditions may differ from preliminary data, so final performance should be confirmed.