Neptune TRU/FLO Installation And Maintenance Manual page 22

Compound meter
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Installing the TRU/FLO
10
Figure 3 Installed TRU/FLO Compound Meter Top View
Figure 4 Installed TRU/FLO Compound Meter Side View
When installing a TRU/FLO meter, always follow normal good-piping
practices. In particular, all gaskets need to be centrally located on their
flanges with no overlap or interference with the pipe diameter. This is
particularly important at the inlet connection to the meter where a gasket
protruding into the flow stream causes unpredictable velocity conditions.
TRU/FLO meters must operate in a completely filled line at all times.
The downstream piping must always provide sufficient back pressure to
maintain a full line at the meter.
TRU/FLO Compound Meter Installation and Maintenance Guide

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