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Dry installation
In a dry installation the pumps are not submerged in the pumped liquid, but installed next to the sump.
Dry weather flow
Dry weather flow refers to the wastewater flow in a sewer system during periods of dry weather with minimum infiltration.
Duty point
The duty point is at the intersection between the Q-H curve and the system characteristics.
DX system
A DX system is a cooling system where the primary coolant is used for evaporation. DX systems are typically used with very small, stand-alone systems, but they can also be used in large industrial cooling systems.
Dynamic pressure
In a closed, pressurised system with a circulating media, the total pressure consists of two elements; a static pressure and a dynamic pressure. The dynamic pressure indicates the amount of the total pressure that results from the media’s velocity in the pipes.
Economizer
The operational efficiency of boiler systems that use natural gas as fuel can be improved by utilising the water content of the flue gas.
Efficiency curve
The curve shows the η (efficiency) of the pump. Efficiency is measured in %.
Efficiency performance standards
Efficiency performance standards regulate motor efficiency and stipulate minimum efficiency requirements.
Effluent
Effluent is the outflow of water from a natural body of water or from a man-made structure.
Electrochlorination
Chlorination is probably the most common method of treating microorganisms in water. Electrochlorination is a safe and simple alternative to chlorine gas and commercial hypochlorite solution.