Safety Relief Valve
Sizing & Selecting the Right Chemical Metering Pump
In 2016 we will start a series of articles which address the very important issue of how to size, select, install and use a metering pump properly. As we all know, chemical metering pump applications are sometimes very complex and require planning and preparation from early on to ensure a successful installation. This series of articles are divided into the following eight sections:
1. Planning: Before we even start with sizing the pump, it is important to plan the application. We take into consideration various things such as the chemical, its physical and chemical properties, storage tank and its location, day use tank and its location relative to the pump and more especially its suction port, the injection quill and its distance from the pump, electrical power requirement etc.
2. Sizing: Here we start with the flow requirements and how much back pressure we encounter in the injection process. We also take into consideration the physical properties such as viscosity and density, and compensate for it. Dosage variation demands are also very important considerations.
3. Selecting the right pump: This is where you understand the different choices you have in types and brands of pumps and how to differentiate between them. We will also discuss life cycle cost versus purchase price of a pump.
4. Selecting the right material: Most chemicals are corrosive in nature and they require selection of material that is resistant to chemical attack. Knowing the exact chemical, its temperature and concentration is critical in selecting the right material.
5. Configuration: Do you want a leak detection system? Is the environment filled with flammable gasses or liquids in which case? What type of connections do you need for suction and discharge piping? These are the questions which will be addressed in this […]
