Fuji Electric FLD-1 - 8. MOUNTING OF DETECTOR; 8.1 Selection of mounting location

38 INF-TN1FSC-E
8. MOUNTING OF DETECTOR
8.1 Selection of mounting location
Detector mounting location, i.e., the conditions of the pipe subjected to fl ow rate measurement
exert a great infl uence on measurement accuracy. So select a location meeting the conditions
listed below.
(1) There is a straight pipe portion of 10D or more on the upstream side and that of 5D or more on
the downstream side.
(2) No factors to disturb the fl ow (such as pump and valve) within about 30D on the upstream side.
L ≥ 10D
Detector
L ≥ 50D
L ≥ 30D
Flow control valve exists on upstream side.
Flow control valve exists on downstream side.
L ≥ 10D
L ≥ 10D
L ≥ 10D
L ≥ 5D
L ≥ 30D
≥ 1.5D
L ≥ 50D
More than
0.5D
More than
10D
More than
10D
D
L ≥ 5D
L ≥ 5D
Check valve
P
Stop valve
More than 10D
90° bend
Tee
Diffuser
Reducer
Valves
Pump
Classification For upstream side For downstream side
Extracted from Japan Electric and Machinery Industry Society (JEMIS-032)