Industrial submersible slurry pump with patented slurry seal sysetm Lawrence Pumps Inc. Series 5100

	"7" Lines of Defense Against Mechanical Seal Failure

1	Slurry Mechanical Seal Effectively isolating the electric motor from the abrasive pumpage is one of the key ways of extending the operating life of a submersible pump. LPI has successfully done this with the development of a simple, rugged, cartridge slurry seal. The seal employs smooth contoured part geometry, hard seal faces, and pusher springs located outside the process stream to avoid the erosive and sometimes corrosive attack of the pumpage.
2	Pressurized Seal Oil Chamber (Top) Preventing solids migration into the seal faces is key to improving seal life. With LPI's pressurized oil chamber, the seal faces are constantly cooled and lubricated by the clean barrier oil. The lower pressure pumpage is unable to enter and erode the seal faces. Oil chamber pressure is maintained by an integral pressurized reservoir mounted on the motor housing.
3	Limited Shaft Deflection For mechanical seals to operate successfully, shaft movement must be minimized. The Series 5100 submersible pumps have been built with a shaft stiffness ratio (L3/D4) of less than 30 to minimize shaft deflection. The shaft is supported by anti-friction bearings having an average life of over 5 years.
4	Vented Seal Chamber Controlling seal face temperature is a key factor in optimizing seal life for the LPI Series 5100. Vapor and slurry are continuously drawn off the top of the lower seal chamber. This continuous venting prevents a vapor pocket from forming and ensures a constant stream of cool compatible barrier fluid over the seal faces.
5	Conditioned Oil Chamber (Top) The oil chamber is epoxy coated to maintain oil cleanliness and provide corrosion protection. This coating prevents iron oxide from forming and causing premature seal failure.
6	Vented Oil Chamber Proper cooling and lubrication of the upper seal requires that the oil level in the chamber be maintained above the seal faces. LPI's exclusive oil vent/bleed system is designed to minimize the vapor trapped at the top of the oil chamber, maintaining a maximum the oil level. Thermal oil expansion is accommodated by the pressurized reservoir mounted integrally with the pump.
7	Expeller (Top) Lower seal performance and life will be adversely affected if solids are allowed to pack the lower seal chamber. LPI's external expeller, mounted at the bottom of the seal chamber, is designed to deflect the heavier, larger particles that would otherwise pack the lower seal chamber and vent line.
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