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
Flow Meter
3 x D
7 x D
2 x D
D (Pipe Size)
D (Pipe Size)
Standard Concentric
Reducers
(No Distance Required)
Figure 8: Minimum 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 a maximum slope angle of 8 degrees on each side 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 .
Forward Flow
Flow Meter
D (Pipe Size)
Standard Concentric
Reducers
(No Distance Required)
Custom Fabricated
Reducers
(8 Degree Slope Angle)
D (Pipe Size)
Figure 9: Pipe reducer requirements
Use this nomogram to determine the occurring pressure drop (only applicable to liquids
with similar viscosity like water) .
D = Pipeline diameter
d = Sensor diameter
1 . Calculate the diameter ratio d/D .
2 . Read the pressure loss depending on d/D ratio and flow velocity .
Pr
essur
e loss in mbar
Diameter relation d/D
Diameter ratio d/D
Meter Location, Orientation and Applications
Page 12
March 2022
MAG-UM-01272-EN-21
