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IEC efficiency standard
The International Electrotechnical Commission (the IEC) developed the IE energy efficiency standard in order to confront the problem of nations having different standards for energy efficiency.
Indirect system
An indirect system is a heating system where the heat emitters are not in direct connection with a boiler or district heating system.
An impeller is a rotating iron or steel disc with vanes in a centrifugal pump.
Indoor temperature
Indoor temperature
Infiltration describes the ingress of groundwater into a sewer system through faulty joints, damaged pipes, at manholes, etc.
Induced power
The difference between the power induced to the pump and the hydraulic power indicates the efficiency of the pump.
Inlet pressure
Inlet pressure describes the pressure available where the suction pipe meets the booster pump.
Installation and commissioning costs (Cin)
The calculation of life cycle cost includes the cost of installing and commissioning a pumping system.
Intergranular corrosion
Metallic corrosion involves the loss of metal at a spot on an exposed surface.
Internal circulation
Sometimes it is necessary to cool the seal faces in a centrifugal pump with a single mechanical shaft seal or remove deposits in the seal chamber. Fitting a circulation pipe can solve this problem.