Testing of 20 inch Flow Meters for Water Application
A series of installation effect tests was carried out on four NIVUS flow meters. The flow meters were an 8-path inline ultrasonic meter (USM), a 4-path inline USM, an electromagnetic meter (EM) and a clamp-on USM. All flow meters were nominally 20-inch in diameter or in the case of the clamp-on USM installed on a 20-inch pipe. A test program was devised to simulate in-service installations and to evaluate the performance of the flow meters under these conditions. A metering package was constructed consisting of all four meters. This entire metering package was installed into two different installations types; straight length and U-shape pipe work. Different disturbances were installed upstream of the metering package and the meters. To give an indication of the performance of each meter, the manufacturer’s claimed uncertainty at a mid point flow rate of 100 l/s was determined. This value was compared with the result at the set flow rate value. A table for this assessment was produced which indicated if the meter was within or not within the manufacturer’s claimed uncertainty value at this condition.
3.4 - Ultrasonic flowmeters
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