Chemical Dosing Pump Selection

The selection of a chemical dosing pump is critical for process safety, efficiency, and chemical savings. The correct pump delivers the right amount of chemical and extends equipment life.

1. Selection Criteria

1.1 Flow Rate and Capacity

• The chemical quantity (L/h, mL/min) to be dispensed by the pump must be determined.
• Flow rate requirements are calculated based on process volume and chemical concentration.

1.2 Pressure Requirement

• Pipeline pressure and resistance in the system must be considered.
• Pressure drops and pipe length affect pump selection.

1.3 Chemical Compatibility

• Pump material and diaphragm/tubing compatibility must be chosen according to the chemical type (e.g., PTFE, PVDF, stainless steel).
• Correct material is vital for abrasive or corrosive chemicals.

1.4 Dosing Accuracy

• A precise pump capable of accurate dosing even in small quantities should be selected.
• In industrial applications, a ±1% error tolerance is considered ideal.

1.5 Control and Automation Compatibility

• The pump must be able to integrate with manual or automatic control systems (PLC/SCADA).
• It should be checked if the flow rate can be adjusted remotely.

1.6 Mechanical Structure and Ease of Maintenance

• Easy diaphragm replacement and hose maintenance should be provided.
• The pump's durability and service life must be considered.

1.7 Safety and Certification

• Priority is given if there are FDA, ATEX, or CE certifications for the food, pharmaceutical, or chemical industries.
• There must be a safe design with a low risk of leakage.

2. Selection Steps

1. Determine process needs: Which chemical, in what quantity, and at what pressure will be used?
2. Calculate flow rate and pressure: Calculate the required flow rate in L/h or mL/min and the system pressure.
3. Check material compatibility: Select pump diaphragm, valve, and housing materials suitable for the chemical's properties.
4. Choose pump type: Is a diaphragm, piston, or peristaltic pump suitable for the need?
5. Accuracy and automation: Determine the process's control and automation requirements.
6. Safety and certification: Check compliance with industry-specific standards.
7. Maintenance and operating cost: Evaluate ease of service and long-term cost.

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