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Night setback
A night setback system is used to control a heating system.
Nitrile rubber
Nitrile rubber may operate up to about 100 °C. Grundfos uses it in its shaft seals as it has a high resistance to oil and fuel.
Nodular iron
The round shape of nodular graphite reduces the stress concentration and consequently, the material is much more ductile than grey iron.
Non-return valve
A non-return valve allows a medium to flow in only one direction.
NPSH (Net Positive Suction Head)
The difference between inlet pressure and the lowest pressure level inside the pump is called NPSH: Net Positive Suction Head.
NPSH Curve
NPSH (Net Positive Suction Head) is an expression for the suction capability of the pump.
Off-line filter
Off-line filtration is in many cases the only feasible principle to achieve the required system cleanliness in large air conditioning and heating systems.
One-pipe system
There are two basic categories of pipe systems: one-pipe and two- pipe systems.
Operating costs (Co)
In the calculation of life cycle cost, operating costs are related to the labour cost of operating a pumping system.
Parts per million
Parts per million (ppm) is used to denote relative proportions in measured quantities; particularly in low-value (high-ratio) proportions.