The effects of flow disturbances on the accuracy of turbine-type water meters
The accuracy of a water meter installed in a pipe is affected by disturbances in the water flow through it. Installing the meter in a sufficient length of straight pipe will eliminate the effects of the disturbance. However, the necessary lengths for particular disturbance patterns, and for the different meter types and sizes, are not known. A research programme carried out by the water meter test laboratories of the EC checked if the meter installation stipulations of the OIML International Document No.4 were valid for modern turbine-type water meters. This report describes the development of in-line flow disturbance devices used by all the laboratories to create identical standardised flow disturbances, the establishment of valid comparisons between each laboratory based on the use of round-robin tests, and the tests carried out to investigate the effects of flow disturbances on water meters. It was concluded that flow disturbances change the accuracy of modern water meters installed (as stipulated in the OIML document) in a pipe, by more than the permitted amount.
Bibliographic Reference: EUR 13965 EN (1985) 10 pp., MF, ECU 4
ISBN: ISBN 92-825-5676-X
Record Number: 199210097 / Last updated on: 1994-12-02
Original language: en
Available languages: en