The LEMCO DRAWDOWN WELL SEAL protects the submersible pump by keeping it submerged in water and preventing it from sucking air. The airtight Lemco Seal helps prevent motor burnout by forcing the submersible pump to draw from the aquifer below, instead of lowering the static water level above the pump.
During dry spells, when the static water level lowers naturally, cavitation and pump failure can result. Wells made in fine sand are especially vulnerable to drawdown. Even when there seems to be plenty of water, a fine screen can restrict water flow and increase drawdown.
Because the seal is airtight, it accounts for a negative pressure or suction, which allows for increased well production. Therefore, we recommend mounting the seal on, or as close to the pump as possible to take maximum advantage of suction.
In the illustration, the submersible pump is submerged in water, pumping normally, unaffected by the amount of drawdown outside the well (where the water level has dropped below the pump inlet). To use an analogy, it's like sucking on a straw to raise the level of the liquid above the glass. The same holds true for the Lemco Seal which takes advantage of suction to raise the water level and keep the pump submerged in water. This makes the Lemco Seal ideal for preventing drawdown and increasing well production in low water level and slow producing wells.