SELECTION AND CARE OF PUMPS

摘要

Since the pump is the heart of the filtration system, it must have the ability to deliver and maintain the desired flow rate and pressure as the dirt builds up on the filter medium. Proper pump and seal selection is critical and requires the following considerations: 1. Flow rate required (tank turnovers per hour in gph) 2. Location (in or out-of-tank) 3. Discharge head and distance 4. Filter medium and pressure drop 5. Solution corrosivity 6. Solution temperature. All construction materials must be compatible with the solution being pumped. In some cases, it is advisable to specify a construction material that will corrode slowly within tolerable limits if the material of ideal chemical resistance is too costly. In addition to the initial investment, careful consideration must be paid to the costs of pump operation, down time, parts, and labor. One should also consider, for each application, the relative advantages and disadvantages of the various styles.