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Labyrinth seal: A non-contacting seal utilizing a tortured path for the escape of the fluid. Utilizes a series of pressure drops to reduce the leakage.



Ladder Bumpers: Rubber caps or inserts which protect the pool plaster or vinyl liner from the sharp steel ends of the ladder.



Ladder, Deck: A ladder for deck access from outside the pool, spa or hot tub.



Ladder, Double Access: A ladder that straddles the pool wall of an aboveground pool and provides pool ingress and egress.



Ladder, Limited Access: Any ladder with provision for making entry inaccessible when a pool, spa or hot tube is not in use (i.e., swing-up, slide-up or equivalent).



Lag Float: A panel float that activates an alarm in a simplex system or the alarm and lag pump in duplex systems.



Laminar: A distinct flow regime that occurs at low Reynolds number (Re < 2000). It is characterized by particles in successive layers moving past one another in a well behaved manner.



Leach Field - A subsurface land area with relatively permeable soil designed to receive pretreated wastewater from a septic tank or intermediate treatment unit. The soil further treats the wastewater by filtration, absorption, and microbiological degradation before the water is discharged to ground water.



Lead Float - A panel float that activates a pump in a simplex system or the lead pump in a duplex system.



Laminar: A distinct flow regime that occurs at low Reynolds number (Re < 2000). It is characterized by particles in successive layers moving past one another in a well behaved manner.



Laminar-1-: Non-turbulent fluid flow. Associated with fluid dynamics and designs of fluid tubing and pipelines.



Laminations: Slotted stampings or punchings of thin (0.018"-0.026") electrical grade steels, stacked and joined together that contain the motor windings and form the magnetic "circuit" of a motor.



Langelier Index: Also called the Saturation Index, Mr. Langelier devised a system to determine water balance by assigning values to levels of pH, Total Alkalinity, Calcium Hardness and water Temperature. When all parameters are in balance, the water will neither be corrosive or scaling. The formula is "SI = pH + TF + CF + AF - 12.1."



Langelier Saturation Index: A calculated number used to predict the calcium carbonate (CaCO3) stability of a water; whether a water will precipitate, dissolve, or be in equilibrium with, calcium carbonate. It is sometimes erroneously assumed that any water that tends to dissolve calcium carbonate is automatically corrosive. Langelier saturation index = Ph- pH, where pH = actual pH of the water, and pH, = pH at which the water having the same alkalinity and calcium content is just saturated with calcium carbonate.



Lantern Ring: A device used to supply lubricant to packing. Usually located in the middle of the packing ring set.



Large Volume Plastic Pumps: These pumps utilize (PSC) motor sealed in a Stainless Steel Housing, which in turn, is surrounded by a plastic case. The PCS motor allows these pumps to use less energy than other pumps of similar flow capacity a permanent split capacitor. The motor also produces less heat ; therefore, the pump does not require oil internally. These pumps are ideal for use in waterfall and stream applications, found in water gardens.



Lateral line & Sprinkler pipe:  The lines down-stream of the sprinkler valve.



Laterals: Elongated, capped plastic nipples at the bottom of a sand filter which are slotted to allow for water passage while keeping the sand in the filter tank.



Laws Of Nature: If you want something, you have to pay for it.



Leach Field: A subsurface land area with relatively permeable soil designed to receive pretreated wastewater from a septic tank or intermediate treatment unit. The soil further treats the wastewater by filtration, absorption, and microbiological degradation before the water is discharged to ground water.



Leaching: The process by which soluble materials in the soil, such as salts, nutrients, pesticide chemicals or contaminants, are washed into a lower layer of soil or are dissolved and carried away by water.



Lead Float: A panel float that activates a pump in a simplex system or the lead pump in a duplex system.



Lead-Acid Battery: A type of secondary battery which uses a positive electrode of lead oxide, a negative electrode of metallic lead and an electrolyte of sulphuric acid (in either liquid or gel form). First developed in 1859 by French physician Gaston Planté.



Lentic waters: Ponds or lakes (standing water).



Levee: A natural or man-made earthen barrier along the edge of a stream, lake, or river. Land alongside rivers can be protected from flooding by levees.



Lift (Suction Lift): Occurs when the liquid source is lower than the pump. The pumping action creates a partial vacuum and atmospheric pressure forces liquid up to the pump. The theoretical limit of suction lift is 34 feet for water at sea level, but in practical applications it is 25 feet or less, depending on the pump style.



Lift (Suction Lift)-1-: Liquid source is lower than the pump. Pumping action creates a partial vacuum and atmospheric pressure forces liquid up to pump. Theoretical limit of suction lift is 34 feet, practical limit is 25 feet or less, depending on pump type and elevation above sea level.



Lift: Associated with the suction side of a pump.



Lift-Out Guide Rail System: A device used to move heavier pumps up and down in a pit or basin.



Ligand: An atom, ion, or molecule that generally donates one or more of its electrons through a coordinate covalent bond to, or shares its electrons through a covalent bond with, one or more central atoms or ions.



Light Niche: The recess in the side of the pool to take an underwater light. Also the can containing the light, cord, etc., which goes in the recess.



Lignin: A polysaccharide found in the cell walls of plants; a breakdown product of decaying vegetation, which may be present in surface water supplies.



Li-ion Battery: The lithium-ion battery is a secondary battery, which uses anegative electrode of lithium-cobalt dioxide and a positive electrode of carbon (coke or graphite), with an electrolyte of a lithium salt dissolved in an organic solvent.



Line bearings: Position the rotor or shaft radially. Normally of the sleeve type.



Linear pressure drop: A straight-line pressure drop across the lapped seal faces. Seldom happens.



Liner, Expandable: A liner that is constructed of a material that has the capability of stretching into a greater depth of irregular shape other than the original construction dimensions.



Liner, Hooper: The liner that is used to obtain greater depth by geometrical pattern construction on the liner bottom or floor to fit a predetermined size and shape.



Liner: A membrane that acts as a container for the water.



Lip Seal: A flexible ring (usually rubber or similar material) with the inner edge held closely against the rotating shaft by a spring.



Liquid End: A series of impellers and diffusers stacked together and mated to an electric motor to form a submersible pump.



Liquid Horsepower: The energy added by the spinning impeller.



Lithium-Manganese Battery: A type of primary cell or battery which uses manganese dioxide and carbon as the positive electrode, lithium metal foil as the negative electrode and lithium perchlorate dissolved in propylene carbonate as the electrolyte. Often called simply ‘lithium cells’, they offer very high energy storage density.



Livestock water use: Water used for livestock watering, feed lots, dairy operations, fish farming, and other on-farm needs.



Load-1-: An area where electrical energy is used or consumed (converted). Load is what is doing the work we want: a light bulb, power saw, or pump motor.



Load-2-: An electric device which consumes energy, placing a load on the source.



Load-3-: The device that converts electricity into another form of energy, such as heat, light, or motion. The load uses the current in a circuit to perform work.



Lobe pump: A positive displacement pump. Primarily used in food applications because they handle solids without damaging them. Lobes are driven by external timing gears as a result the lobes do not make contact. Liquid travels around the interior of the casing in the pockets between the lobes and the casing, meshing of the lobes forces liquid through the outlet port under pressure. They also offer continuous and intermittent reversible flows and can operate dry for brief periods of time. Typical applications are in following industries: food, pharmaceuticals, paper & pulp, beverages, chemical and biotechnology.



Locked Rotor Amps (L.R.A.): Line current drawn by a motor at starting or when nameplate voltage is applied and the rotor is not rotating (locked).



Locked Rotor Time or Stall Time: Time in seconds that a motor can withstand locked rotor (stalled) current without damage.



Locked Rotor Torque (L.R.T.): Starting Torque or Breakaway Torque -- The torque developed by the motor when starting or when stalled (rotor blocked).



Lopes or Loping: A condition where a diesel engine fires rapidly at top dead center (tdc), so piston, rod, and crank accelerate rapidly. As the piston moves away from the combustion, it slows down until it reaches tdc and fires again. Then it accelerates and repeats the cycle. A diesel engine requires the use of a rubber coupling.



Low NPSH pump: A pump designed for application with a low N.P.S.H. available, usually has an inducer. See inducer.



Low Water Suction: An influent fitting, typically low on the wall in the deep end of a vinyl liner pool. It is a cheaper alternative to a main drain.



Lower Distribution System (Underdrain): Those devices used in the bottom of a permanent medium filter to collect the water during the filtering and to distribute the water during the backwashing.



Low-Pressure Pipe LPP Distribution Systems: A private sewage system that requires a pump. An Effluent Pump lifts a predetermined volume of collected septic overflow and distributes it throughout the absorption area at a uniform pressure. The advantage of flexibility in locating the absorption field is inherent. In addition, the uniform distribution minimizes plugging and is significantly more effective in hard soils and high water tables. LPP distribution fields may be smaller in area than those used in other types of septic systems. Absorption fields can be located on sloping ground or on uneven terrain that would be unsuitable for gravity flow systems.



Lubricant: Any fluid that will maintain a film thickness of one micron or more at its operating temperature and load.