Dosing Pump Flow Rate Calculation

Dosing pump flow rate is the amount of liquid delivered into the system by the pump within a specific period. Calculating the flow rate is a critical step to ensure accurate chemical dosing and process control.

1. Required Information

• Pump operating time (t) → seconds (s), minutes (min) or hours (h)
• Volume of liquid discharged from the pump (V) → liters (L) or milliliters (mL)
• Target flow rate unit → L/h, L/min, g/h (depending on liquid density)

2. Flow Rate Calculation Method

Step 1: Measuring Pump Output

• Operate the pump for a specific period (e.g., 1 minute).
• Weigh or measure the liquid discharged from the pump (you can use a measuring cup).

Step 2: Calculating the Flow Rate

• Formula:

$$\text{Flow Rate (L/h)} = \frac{\text{Measured Volume (L)}}{\text{Operating Time (h)}}$$

• Example Calculation:
  The pump delivered 0.5 L of liquid in 1 minute.

$$\text{Operating time (h)} = 1 \text{ minute} = \frac{1}{60} \text{ hour}$$ $$\text{Flow Rate} = \frac{0,5 \text{ L}}{1/60 \text{ h}} = 0,5 \times 60 = 30 \text{ L/h}$$

Step 3: Adjust if Necessary

• Use the flow rate adjustment knob or software parameter on the pump.
• Measure again to ensure it matches the target flow rate.

3. Important Notes

• Pump hoses and valves must be fully open, with no blockages.
• If measuring with chemicals, PPE and safety precautions must be used.
• Pump flow rate can be affected by factors such as system pressure, hose length, and viscosity.
• Regular flow rate measurement is important for accurate dosing and process stability.

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