Straight Pipe Requirements
Sufficient straight-pipe runs are required at the detector inlet and outlet for optimum meter accuracy and performance. An
equivalent of three diameters of straight pipe is required on the inlet (upstream) side. Two diameters are required on the outlet
(downstream) side.
FORWARD FLOW
MINIMUM STRAIGHT PIPE
MINIMUM STRAIGHT PIPE
ELBOW
TEE
GATE VALVE
(FULLY OPEN)
MINIMUM STRAIGHT PIPE
CHECK VALVE
GLOBE VALVE
BUTTERFLY VALVE
PUMP
ELBOW
TEE
ANY VALVE
FLOWMETER
3 x D
7 x D
2 x D
D (Pipe Size)
D (Pipe Size)
MINIMUM PIPING REQUIREMENT
STANDARD CONCENTRIC
REDUCERS
(NO DISTANCE REQUIRED)
Figure 8: Straight Pipe Requirements
Pipe Reducer Requirements
With pipe reducers, a smaller meter can be mounted in larger pipelines. This arrangement may increase low-flow accuracy.
There are no special requirements for standard, concentric, pipe reducers.
Custom fabricated pipe reducers must have an approximate slope angle of 15 degrees to minimize flow disturbances and
excessive loss of head. If this is not possible, install the custom pipe reducers as if they were fittings and install the required
amount of straight pipe.
Figure 9: Pipe Reducer Requirements
SSK
513
Electromagnetic Flow Meter
Page 10
March 2014
