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I.D.: Inside diameter.



I.S.O.: International standards organization. Sets pump and seal standards for the metric community.



ID Run Failure: The correct information about the motor was not entered into the PID.



Impedance Protected: A non-mechanical method of preventing motor overheating. The motor coil is designed to "impede" excess current, resulting in a stabilized motor temperature.



Impeller eye: That area of the centrifugal pump that channels fluid into the vane area of the impeller. The diameter of the eye will control how much fluid can get into the pump at a given flow rate without causing excessive pressure drop and cavitation. The velocity within the eye will control the NPSHR. 



Impeller eye-1-: The center of the impeller or the point where fluid enters the impeller.



Impeller shroud: The plates located on one or both sides of the impeller vanes. Prevents solids from penetrating behind the vanes.



Impeller vane: Located between the eye and the discharge side of the impeller. Directs the flow of the liquid to the outside diameter of the impeller.



Impeller: A disk with multiple vanes. It is attached to the pump engine or motor and is used to create the centrifugal force necessary for moving water through the pump casing.



Impeller-1-:   Attaches to the end of the shaft to impart energy to the fluid being pumped. Available in open, semi- open and closed designs.



Impeller-2-: The bladed member of the rotating assembly of the pump which applies the principal force to the liquid being pumped.



Impeller-3-: The rotating element of a pump which imparts movement and pressure to a fluid.



Impeller-4-: The rotating vanes of a centrifugal pump; its action creates the flow of water. The impeller is shaft driven by an electric motor.



Impeller-5-: The moving element in a pump that drives the fluid. A rotating disk with a set of vanes coupled to the engine or drive shaft that produces centrifugal force within the pump casing of a centrifugal pump. The impeller is the rotating element of a pump which imparts movement and pressure to a fluid.



Impeller-6-: The rotating element of a pump which consists of a disk with curved vanes. The impeller imparts movement and pressure to the fluid. The impeller consists of a back plate, vanes and for closed impellers a front plate or shroud. It may be equipped with wear rings, back vanes and balancing holes.



Impermeable layer: A layer of solid material, such as rock or clay, which does not allow water to pass through.



Inducer:  A small axial flow vane that attaches to the impeller of a centrifugal pump to increase the N.P.S.H. available.



Inducer-1-:  An inducer is a device attached to the impeller eye that is usually shaped like a screw that helps increase the pressure at the impeller vane entrance and make viscous or liquids with high solids pumpable. It can also be used to reduce the NPSHR.



Induction Motor: An induction motor is an alternating current motor in which the primary winding on one member (usually the stator) is connected to the power source and a secondary winding or a squirrel-cage secondary winding on the other member (usually the rotor) carries the induced current. There is no physical electrical connection to the secondary winding, its current is induced.



Induction motor-1-: The most common type used in industry. Has a slippage of 2 to 5 percent compared to synchronous motors.



Industrial water use: Water used for industrial purposes in such industries as steel, chemical, paper, and petroleum refining. Nationally, water for industrial uses comes mainly (80%) from self-supplied sources, such as a local wells or withdrawal points in a river, but some water comes from public-supplied sources, such as the county/city water department.



Infiltration: flow of water from the land surface into the subsurface.



Influent: The inflow or entering water to a filter or other device.



Influent: The water coming into and up to the impeller from the suction lines. These pipes are under vacuum pressure.



Injection well: Refers to a well constructed for the purpose of injecting treated wastewater directly into the ground. Wastewater is generally forced (pumped) into the well for dispersal or storage into a designated aquifer. Injection wells are generally drilled into aquifers that don't deliver drinking water, unused aquifers, or below freshwater levels.



Injector: An assembly containing a nozzle and venturi which is used to draw water from a well in conjunction with a centrifugal pump. Same as injector. Same as ejector.



Inlet/Intake: Refers to the opening through which water enters the pump head.



Inlet: The fitting through which the filtered water passes to the pool (filtered water inlet), or the fitting through which raw water passes to the pool (raw water inlet).



In-Line Pump: A pond  pump which operates in open air, by connecting tubing to the inlet and discharge outlet.



Inline pump: Mounted in the piping. No base plate or alignment required.



In-Line: A pond pump which operates in open air, by connecting tubing to the inlet and discharge outlet.



Inorganic Contaminants: Mineral-based compounds such as metals, nitrates, and asbestos. These contaminants are naturally-occurring in some water, but can also get into water through farming, chemical manufacturing, and other human activities. EPA has set legal limits on 15 inorganic contaminants.



Inrush Current: See Locked Rotor Amps.



Insulated Gate Bipolar Transistor (IGBT): Solid state devices used to switch the DC bus on and off at specific intervals.



Insulation Class: Insulations have been standardized and graded by their resistance to thermal aging and failure. Four insulation classes are in common use. For simplicity, they have been designated by the letters A, B, F, and H. The temperature capabilities of these classes are separated from each other by 25° C increments. The temperature capabilities of each insulation class is defined as being the maximum temperature at which the insulation can be operated to yield an average life of 20,000 hours.



Insulation Temperature Rating: The insulation class temperature rating for 20,000 hours of average insulation life is : Class A 105° C (221° F) ; Class B 130° C (266° F); Class F 155° C (311° F); Class H 180° C (356° F)



Insulation: Generally refers to the maximum allowable operating temperature of the motor. Class A -105°, C, B - 130°C, F - 155°C, H - 180°C. The motor rise plus the ambient temperature should be equal to or less than the maximum allowable temperature for the insulation class.



Insulator: A material that does not allow a very good movement of electrons; rubber & paper



Insulator-1-: A material that is highly resistant to the conduction of electricity. Ceramics and polymers are excellent insulators.



Internal energy: A thermodynamic property. The energy associated with a substance at a molecular level .



Internal gear pump: A positive displacement pump. The internal gear pumping principle was invented by Jens Nielsen, one of the founders of Viking Pump. It uses two rotating gears which un-mesh at the suction side of the pump to create voids which allow atmospheric pressure to force fluid into the pump. The spaces between the gear teeth transport the fluid on either side of a crescent to the discharge side, and then the gears re-mesh to discharge the fluid. Viking's internal gear design has an outer drive gear (rotor- shown in orange) which turns the inner, driven gear (idler-shown in white).



Internal recirculation: A loss of efficiency caused by liquid flowing through wear rings or the impeller to volute clearances.



Internal Resistance: The resistance to the flow of an electric current within the cell or battery. All cells and batteries inevitably exhibit internal resistance, which limits discharging and charging current levels and produces heat within the battery.



Inverter: A circuit that inverts DC voltage back to AC.



Iodine: An element related to chlorine and bromine used as a disinfectant, both in its natural solid form and in iodide compounds. When iodides are used, chlorine is normally employed to free the elemental iodine.



Ion Exchange: A process by which certain ionized chemicals present in water are replaced with other ionized chemicals temporarily attached to resin particles. The exchange process is made only for ions having the same charge.



Ion: An atom or molecule having either a positive or negative electrical charge. Positively charged ions are referred to as cations and ions having a negative charge are termed anions.



Ion-1-: An atom, or group of atoms that possess an electrical charge.



Ionizer: An ionizer is a device mounted on your return line, and through which water flowing will receive charged metal ions. Manufacturers may use a copper anode and/or silver. Copper is an algaecide and algaestat, while silver is known for its properties as a bactericide. This electric, limited technology has been replaced by the Vision System.



Iron Bacteria: Bacteria which thrive on iron and are able to actually use ferrous iron (as found in water or steel pipes) in their metabolic processes to incorporate ferric iron in their cell structure and to deposit gelatinous ferric hydroxide iron compounds in their life processes.



Iron: A very common element often present in ground water in amounts ranging from 0.01 to 10.0 ppm(mg/l). Iron may be found in three forms: in soluble forms such as in ferrous bicarbonate; bound with a soluble organic compound; or as suspended ferric iron particles. Iron above 0.3 mg/l is objectionable to water because of staining of laundry and plumbing fixtures.



Iron-1-: Usually introduced into the water from iron plumbing or from well water, Ferric Iron can stain surfaces, while Ferrous Iron will turn your water a clear green color.



Irrigation water use:  Water application on lands to assist in the growing of crops and pastures or to maintain vegetative growth in recreational lands, such as parks and golf courses.



Irrigation: The controlled application of water for agricultural purposes through manmade systems to supply water requirements not satisfied by rainfall. Here's a quick look at some types of irrigation systems.



Iteration: A method of solving an equation by trial and error. An iteration technique is used to solve equations where the unknown variable cannot be explicitly isolated. A frequently used technique is the Newton-Raphson method.