![]() In wastewater and sewer applications, the “peak flow” needs to be able to be pumped by the lift station even if it never happens. This requirement is something called “peaking factor,” and it describes the maximum flow rate that could potentially ever need to be pumped. The efficiency reasons have to do with a typical design requirement for pumping wastewater. The best answer is that there are efficiency and redundancy reasons for using two pumps over one. The first question you might have about a duplex pump station is why two pumps are necessary. Duplex configurations are often the best engineering solution for wastewater applications. Pump stations can also be designed as simplex, triplex, and up to pentaplex configurations, all depending on how many pumps are required to meet the flow requirements. A duplex configuration means that there are two pumps in the system. The duplex pump configuration is one of the most common configurations in a pump station design, and it provides owners with several benefits. Generally, if the numbers are relatively close, going to the next size larger unit is highly recommended.Romtec Utilities designs, engineers, manufactures, and supplies all types of pumping systems for a wide variety of applications. The Total Dynamic Head that your pump must overcome has be lower than that shut off number in order for the pump to work correctly. The pumps are listed on our website as having a shut off at a certain feet of head. If you do not know the TDH for your application, our technicians will be able to calculate it for you simply knowing the vertical lift and the run distance. ![]() These two figures put together are what we call Total Dynamic Head (TDH). This number is figured by calculating the vertical lift (static head) along with pipe friction loss using the size of pipe, length of run, and flow rate of the pump. Head Pressure is simply the force that the pump must overcome to be able to push the water to its destination. If you can answer these questions, then choosing a submersible pump will be a piece of cake! HEAD PRESSURE EXPLAINED What kind of flow rates will the pump need to handle? (Roughly how many GPM do you expect to run through the pump at MAX capacity)? What kind of head pressure will the pump be pushing against? (The numbers you need to know is how high vertically the pump needs to push the water and the length of the horizontal run.) To make a decision on which size of effluent pump will work best for any certain application there are a few questions you will need to know the answer to: Effluent pumps can be used as sump pumps, but we would not recommend using a sump pump in an effluent pump application. Sump pumps are only designed to handle solids up to ¼’’ in diameter. This drainage water is typically clear and has little to no solids in it. Sump pumps are used to remove drainage water that has accumulated in a sump basin, commonly found in the basement or crawlspace of homes. Sewage ejector pump normally have a 2’’ or 3’’ discharge. They are designed to handle large solids up to 2’’ in diameter. These pumps are installed in a lift station that pumps raw sewage from a house or office to the septic tank or city sewer. Sewage Ejector Pumps are designed to handle raw sewage. Effluent pumps will normally have an 1-1/2’’ or 2’’ discharge. Because the septic tank or aerobic system has eliminated most of the solids, effluent pumps are only designed to handle small solids up to ¾’’ in diameter. These pumps are usually installed in a lift station after a septic tank or aerobic treatment system and will pump to a secondary treatment system such a drain field. EFFLUENT PUMPS - vs - SEWAGE EJECTOR PUMPS - vs - SUMP PUMPSĮffluent pumps are designed to handle treated wastewater with minimal solids. Submersible Effluent Pumps are designed to pump treated wastewater from a septic tank or aerobic treatment system to a drain field, sand filter, mound system, or any other type of secondary treatment system.
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