By McCrometer, Inc.
Shell Refinery had the need to measure hot air in 2 locations with a low pressure drop. The problem was that the hot air was blown through square ducts with a dimension of 1400 x 502 mm and 1200 x 451 mm. There were was a split off from a larger duct in two legs and where the flowmeter was to be placed there was littrerly no strait pipe runs. The total strait section available was 1800 mm; for all ducts the same.
Since Shell needed the flow information for enviromental reasons it was important to find a quick solution to the problem.