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Sewage Ejectors Below Grade (ground) Bathrooms Nearly all residential plumbing systems rely on the force of gravity to supply incoming water and to provide for the discharge of waste. But there are times when gravity will not do the job. Occasionally, a fixture needs to be installed below the nearest available sewer or septic line, and the waste from the drain must be lifted to the level of the main drain. An ejector pump must be installed to accomplish this. Ejector pumps are required where wastewater cannot flow to its destination by means of gravity at a velocity of at least 2 feet per second. Types These systems are generally rated to a maximum temperature of 180 degrees F, which means that boiling water should not be poured down the drain. Sizing for commercial or industrial applications involves complex formulas, and a professional engineer should design these installations. In most cases, a licensed master plumber should be qualified to design a residential system. There are 3 ways to size a sewage pump. Each method is based on peak flow: The Fixture unit calculation estimates usage demands of a typical plumbing fixture(s). This method is suitable for residential and small commercial applications. The Population method is used when designing large-scale municipal sewage systems. In each case, the design must also consider total dynamic head, the highest vertical point, and the size of the basin provided. Regardless of peak flow requirement for a given application, the pump must always be able to provide a minimum velocity of 2 feet per second through the line.
Submersible Wastewater Pumps
Some cutting of concrete will be involved in basement through-the-slab installations, and this will add to the cost as well as the difficulty of installation. Basins are fabricated from fiberglass, cast iron or heavy-duty high-density polyethylene plastic. Cast iron models come with lids of the same material, while polyethylene and fiberglass models have a lid that is molded from high-density structural foam, sealed with pressure sensitive foam gaskets. Nearly all residential models are pre-drilled with inlet holes and a Schedule 40 PVC hub adapter that receives standard 4" Schedule 40 PVC or ABS sewer pipe. Most residential pumps have standard 2" NPT discharge outlets, with 3" discharge optional on some units. Our most popular model is the Zoeller model 266 (shown above). As drainage pipes flow into the basin, the fluid level rises and triggers the float switch which then engages the pump and lifts the sewage up through a check valve into your regular drain line, much the same as in a sump pump. The water cools the motor naturally, adding to its life span. Field service is simple and sure. And submersible manufacturers report that fewer than one-half of one percent of the pumps they ship are returned for replacement..
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