Badger Meter ModMAG M Series - Pipe Reducer Requirements

Forward Flow
Minimum Straight Pipe
Minimum Straight Pipe
Elbow
Tee
Gate Valve
(Fully Open)
Minimum Straight Pipe
Check Valve
Globe Valve
Buttery 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 ow velocity.
Pressure loss in mbar
Diameter relation d/D
Diameter ratio d/D
Meter Location, Orientation and Applications
Page 12 March 2022MAG-UM-01272-EN-21