Reduced end-user confidence and reluctance to pay for the frequent unclogs and repairs, since the end user feels that the service company may not be up to the task of finding a long-term solution.Cost of pump overhaul after possibly running partially clogged and without lubrication to the lower sleeve bearing.Disposal of the items removed from the clogged pump.Cost of pump removal, unclogging and reinstallation.Exposure of service personnel to unknown and potentially life-threatening pathogens.When dealing with a problematic sewage ejector installation that experiences clogs every few months (or worse, every few weeks), some factors to consider are: Use a grinder/cutter/shredder pump-This may be the best option since, by design, these pumps will reduce sewage solids to a fine slurry that can be easily pumped out without causing clogs or other problems.ĭealing with sewage is a nasty business, so the desire to minimize human exposure has always been a prevalent factor when selecting sewage handling equipment.A macerator will only shred and, therefore, cannot replace a pump. Install a macerator-Macerators can be effective against solids, but usually cannot be easily installed if the facility was not designed for them.They often clog when a large number of disposable items enter the pump in rapid succession, especially if some of these items are long and fibrous. However, it is not an ideal solution, because even the more aggressive chopper pumps do not reduce the size of the solids enough to prevent subsequent clogging. Use a submersible chopper pump-This is a good option and extends the time between clogs.This also works for a while, but the clogging is only delayed, not avoided, since large stringy items enter the pump anyway. Use a carbide-tip impeller-An impeller with carbide tips would cut the solids against stationary hard edges on the suction casing.Install a recessed vortex impeller-This usually alleviates the problem temporarily, but when a mop head or a similar bulky item goes through the pump, it will usually get stuck at the check valve.The more proactive managers and maintenance engineers have chosen other options: Many just choose to live with the problem. Property managers and maintenance engineers have been faced with frequent and expensive service calls to unclog these ejector pumps. However, for high traffic areas, the story is different. ![]() These ejector pumps have been and are still doing a great job in many low-traffic, well-maintained installations. A control panel with the aid of floats would turn the pumps on and off at pre-set levels, alternate their operating cycles and sound a high-level alarm if required. The pumps would typically be suspended from a plate covering the top of the pit and positioned so that the suction port rests 12 to 18 inches from the bottom of the pit. A typical installation could comprise a round pit about 4 feet to 6 feet in diameter and possibly 6 feet to 8 feet deep. For the most part, the job of evacuating sewage from a collection pit in the basement of a hospital, hotel or high-rise building has been given to a 4-inch or 6-inch solid handling sewage ejector pumping system with motors and stands above ground. The challenge of pumping these items from a sewage collection pit, where they invariably end up, into the main sewer line has become a critical problem. The variety and popularity of personal disposable items has drastically increased in recent years.
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