When operating a dosing system, there are several important factors to consider in order to ensure optimal performance and safety. Here are key points to keep in mind:
A. **Dosing Pressure** – Maintaining the correct pressure is crucial for accurate dosing. Too much or too little pressure can lead to inefficiency or damage.
B. **Stroke Frequency** – Adjusting the stroke frequency allows for precise control over the dosing rate, especially in applications requiring variable flow rates.
C. **Suction Height** – The pump's ability to draw liquid from a source depends on the suction height. This must be within the pump’s capabilities to avoid cavitation or failure.
D. **Altitude** – At higher altitudes, atmospheric pressure decreases, which can affect the pump’s suction performance. Proper adjustments may be necessary.
E. **Corrosive Chemicals** – If the system handles corrosive substances, it’s essential to use compatible materials and ensure proper sealing to prevent leaks and equipment degradation.
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When the metering pump outlet is at atmospheric pressure, improving repeat measurement accuracy is essential. One effective solution is to install a backpressure valve at the end of the line. While installing a valve spring on the discharge valve can help, the most significant improvement comes from using a properly sized backpressure valve.
**How to adjust the back pressure valve?**
1. Always ensure that the pressure does not exceed the maximum working pressure of the metering pump.
2. When the suction side of the dosing pump has pressure, the discharge side should be at least 1 bar higher than the suction side to maintain stable operation.
**How to choose the right pulse damper volume?**
To reduce 90% of pulsation, calculate the minimum required volume of the pulsation damper by multiplying the metering capacity (in ml) per stroke by 26. This ensures smoother flow and more consistent dosing.
**How to set the pressure relief valve?**
The pressure relief valve should be set within the rated working pressure range of the metering pump. It must never exceed the maximum allowable pressure. For example, if the pump’s maximum working pressure is 3 bar, the relief valve should be set at or below 3 bar. This prevents over-pressurization, which is a common cause of pump failure.
**What is the maximum allowable forward pressure when using ProMinent® metering pumps?**
For ProMinent® Alpha metering pumps, the forward pressure should not exceed 1 bar above the pump’s discharge pressure. Exceeding this limit can cause operational issues and damage to the pump.
**If the delivered liquid is not water, how to calculate the suction height?**
To determine the effective suction height for non-water liquids, divide the pump’s nominal aspiration height by the specific gravity of the liquid. This adjustment accounts for differences in density and ensures proper pump performance.
**Under what circumstances should self-priming suction be used?**
Self-priming suction is suitable in the following situations:
1. When measuring volatile liquids.
2. When handling high-volume or high-proportion liquids.
3. When higher stroke frequencies are needed.
4. When the pump is operating in high-altitude areas.
5. When large tanks are involved and self-priming is not feasible.
By understanding these factors and applying the right techniques, you can significantly improve the efficiency, accuracy, and longevity of your dosing system.
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