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Airlift pump
The airlift pump – also called mammoth pump – exploits the increase of the oxygen intake in water under pressure. At the same time, rising air is used to lift – and therefore circulate – water. This makes the mammoth pump suitable for aerating and circulating large volumes of water. An airlift pump is often used in situations where maintenance needs to be kept to an absolute minimum.
Air vent
To prevent corrosion and problems with operation, heating and air-conditioning systems must be constructed so that air can be removed both when the system is filled and during subsequent operation.
Aluminium
Pure aluminium is a light, soft metal with a density of about a third of that of steel. Pure aluminium has a high electrical and thermal conductivity.
Ambient condition
“Ambient conditions” is a set of parameters used by designers for dimensioning ventilation and cooling systems. Ambient conditions typically include temperature, humidity and air pressure.
Anaerobic
Anaerobic conditions under wastewater transport and treatment imply that neither nitrate, sulphate nor oxygen are present for the decomposition of organic matter.
Anoxic
Anoxic conditions, as for anaerobic conditions, indicate the absence of pure oxygen. However, compounds such as nitrate or sulphate can be present under anoxic conditions.
ATEX
ATEX is an abbreviation of a French term used to denote an explosive atmosphere.
Axial fan
An axial fan is a type of fan where both motor and wings are mounted directly on the axle. When the axle and the wings rotate, it results in a current parallel with the axle.
Back-to-back seal
A back-to-back seal describes two shaft seals mounted back-to-back to provide a higher level of safety and reliability.
BACnet
BACnet is a data communication protocol for Building Automation and Control Networks. It is a standardised technology for building automation and supports a variety of specific physical network standards, which makes it ideal for use on all automation levels.