The air flow test facility, also known as the Bulderbaan, conducts first time verification, control and recalibration of volume, mass, and dP meters, using atmospheric air in the flow range of 65-25000 m3/h, Ucmc 0,23%.

Air flow calibration facility - one of the largest in the world

With its 14 m in length and 1,8 m in height, the air flow calibration facility is one of the largest of its kind in the world, especially due to its flow range capacity from 65 (Q-min) to 25000 m3/h (Q-max).

The air facility consists of five parallel reference lines, and a measuring line in series with these, where the meter under test (MUT) is located.

The air flow facility operates according to the suction principle under atmospheric conditions, where two RPM controlled centrifugal blowers draw air from the calibration room, through the meter under test, and then through the reference strings containing the working standards further downstream.

Flow distribution:

  • (BU201) Blower A: Supplies WS201, WS202, and WS203 with air flow
  • (BU202) Blower B: Supplies WS204, and WS205 with air flow

Flow meter types:

The air calibration facility can handle all types of flow meters for measurement of air and other gasses, including USM, turbine meters, swirl meters, coriolis meters, flare gas meters, etc. up to 50” in diameter.

Take tour in the air flow calibration facility - the Bulderbaan

The Bulderbaan consists of two blowers, buterfly valves, four working standards (WS), POV valves and is easy to attach to spools, adaptors etc. It is to be approved according to BIPM in 2020.
The air facility consists of five parallel reference lines, and a measuring line in series with these, where the meter under test (in yellow) is located.
The Bulderbaan operates using atmospheric air in the flow range of 65-25000 m3/h, Ucmc 0,23%.

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