The lead float is the float that runs whichever pump happens to be called on for at that cycle. The stop float is the float that turns off whichever pump was called on to run. There are some systems that do use four floats, separating the lag and the alarm function. The alternating control panel is typically operated by three control float switches: stop float, lead float, and lag/alarm float. If one pump needs to be serviced, the system remains automatic by utilizing the lag pump. In wastewater and sewer applications, the peak flow needs to be able to be pumped by the lift station even if it never occurs.Īn alternator controlling the duplex system allows the pumps to cycle between starts, resulting in even wear on the pumps. The duplex design is often referred to as lead/lag systems because the standby pump (lag) is activated as demand exceeds the capacity of the lead pump or if the lead pump were simply to fail.įor example, a typical design requirement for pumping wastewater is that a single pump will discharge more than the peak inflow. The duplex pump system is one of the most common configurations in a pump station design, providing efficiency and redundancy. Duplex systems are also used in large volume stormwater pump stations, as well as when redundancy is desired. Please visit our sponsor [ Edited 1 times.In Wisconsin, duplex pump systems are required by code in commercial buildings when there are three or more water closets or more than 20DFU’s draining into a sewage basin. Since 1995 (3 years before Google started) has been THE best plumbing supplier on the web. Now if we want to use your oversize figures and they are oversized I would say dig up the yard and install a 3" pipe to the city line that will drop you back down to the 1/2 horsepower 266 - 268 series pumping 90.68gpm with a total dynamic head of 9.82' Plugging in your figures would require the use of the Zoeller 292 which will pump 86.35 GPM at a total dynamic head of 21.45' Repair your leaking Plumbing fixtures ASAP [ This slow drip will waste 7+ gallons of water per day.Īt the actual 3' lift 80' run with 2" plastic pipe with 2 90 degree elbows, check valve, and a gate valve.ġ/2 horsepower Zoeller 266, 287, and 268 models will pump 67.07 GPM with a total Dynamic Head of 12.79'Ĥ/10 horsepower Zoeller 264 will pump 55.59 GPM with a total dynamic head of 10.6'Ĥ/10 horsepower Zoeller 211 will pump 54.28 GPM with a total dynamic head of 10.37 "The society which scorns excellence in Plumbing as a humble activity and tolerates shoddiness in philosophy because it is anĮxalted activity will have neither good Plumbing nor good philosophy: neither its pipes nor its theories will hold water.". Around here, Zoeller and Little Giant are mainly used for residential ejector systems. I'd suggest hiring another Plumber that is more familiar with sewage ejector systems.Īs for that particular brand, never heard of it. Houses that rely solely on a pumping system to handle waste discharge should have a duplex system installed with an alarm to alert you when there is a problem with the system. Sewage is! I would appreciate any advice you may have. My plumber doesn't seem to know about them.Ĭost is not an issue for me. ![]() ![]() I am also wondering about a duplex system - which I saw mentioned on this forum. But I am wondering if I should buy the same pump or whether there is something better and more reliable. I am planning to buy a spare pump and store it in the garage for when the next failure occurs. We don't put anything more exotic than toilet paper into the sewage system so are a bit puzzled as to why this is happening. The pumps were all Myers SRM4 and the plumber tells me that he puts these in frequently and has typically seen them last for 5-10 years. In a year and a half, we have had to have 2 pumps replaced - one by the builder and one on our own by a plumber. ![]() Therefore, the house was built with a sewage grinder/pump which serves the whole house. I live in a new 4 bedroom, 3 1/2 bath home which sits about 2 feet below street level and the house sewers are slightly below the level at which they would flow out via gravity.
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