Diaphragm Pump Performance and Selection Criteria
Diaphragm pumps, also known as membrane pumps, are positive displacement pumps designed to transport fluids such as water, chemical mixtures and other high viscosity materials. These pumps are used in process industries such as petrochemical, oil and gas, and pharmaceuticals because of their versatile design, reliable performance and significant cost savings.
To ensure optimal performance and efficiency, it is essential to select the right diaphragm pump for the specific application. Diaphragm pumps are available in a wide range of sizes and configurations, and each is designed to meet specific requirements. The primary selection criteria include:
1. Flow Rate: The flow rate determines how quickly a diaphragm pump can transfer a liquid. The flow rate is determined by the pumps design, size, and operating parameters.
2. Pressure: Pressure plays a key role in diaphragm pump performance. Increasing the pressure applied to the pump increases the flow rate, but can decrease the efficiency. It is important to choose a pump that can handle the desired pressure.
3. Type of Liquid: Diaphragm pumps work best with low-viscosity liquids, such as water and other non-volatile fluids. If the application requires the handling of high-viscosity liquids, it is important to select a diaphragm pump specifically designed for this purpose.
4. Temperature: It is important to select a diaphragm pump that is designed to handle the maximum temperature of the application. This ensures that the pump will not overheat or be subject to premature wear and tear.
5. Duty Cycle: A diaphragm pump’s duty cycle is the amount of time the pump can run without suffering damage or excessive wear.
In addition to these selection criteria, it is important to consider the specific requirements of the application. The most important factors are the pressure, flow rate and type of liquid that will be handled. Depending on the application, it may be necessary to look for pumps with particular features such as higher pressure ranges, improved corrosion resistance or increased safety features such as air-lock detectors, shut-off valves and pressure relief valves against inadvertent over-pressurization.
A properly selected diaphragm pump can provide significant performance advantages, such as improved efficiency, higher pressure capabilities and extended duty cycles. In addition, diaphragm pumps are often more reliable than other pump designs, reducing the likelihood of costly downtime due to maintenance or repairs. With careful selection and proper maintenance, these pumps can provide reliable operation for years.
