Neptune TRU/FLO, Installation And Maintenance Manual

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Installing the TRU/FLO
TRU/FLO Compound Meter Installation and Maintenance Guide 9
Installing the TRU/FLO
All TRU/FLO meters operate more accurately and reliably if installed
properly. Install the TRU/FLO meter in a horizontal position with the
registers facing upwards, and the flow running in a horizontal direction.
The TRU/FLO meter’s performance is directly related to the flow
conditions of the water stream entering the meter. If the flow conditions
are distorted as a result of improperly installed upstream fittings or
piping changes, the TRU/FLO meter’s performance can be adversely
affected.
Installing Strainer
Neptune recommends that all TRU/FLO meters be installed with a plate
strainer at the meter inlet for 3-inch meters and above. The strainer, in
addition to protecting the meter from debris in the line, also corrects the
velocity profile of the flow to the meter.
When installing Neptune meters with a strainer, a minimum of
4-pipe-diameters of straight run pipe is required upstream of the meter
and strainer assembly. A minimum of 2-pipe-diameters of straight run
pipe is required downstream of the meter and strainer assembly.This can
include components that are fully open in their normal operating
position.
If a Neptune meter is installed without a strainer, a minimum of
8-pipe-diameters of straight run pipe is required upstream of the meter
and strainer assembly. A minimum of 2-pipe-diameters of straight run
pipe are required downstream of the meter and strainer assembly. This
can include components that are fully open in their normal operating
position.
New Meter Installation
Figure 3 and Figure 4 show the recommended installation of a
TRU/FLO meter. This installation incorporates a plate-type strainer
attached to the inlet of the meter. Figure 5 also shows a bypass which
provides uninterrupted service capability during periods of meter
service.
The upstream plate-type strainer provides protection against meter
damage from debris in the lines and minimizes the effects of variation in
upstream piping. Use of a Neptune strainer of the same line size as the
meter is specifically recommended. This strainer design provides
optimum velocity profile correction at minimum additional head loss.
The strainers for the 3-inch, 4-inch, and 6-inch TRU/FLO meters are
NSF/ANSI 61 compliant. They are made of a lead free, high-copper
alloy.