D-1401 & D-1402 Portable Metering System Installation and Operation Guide • 03-17
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3.3
I NSERTI ON OF THE M ETER
CAUTI ON
SYSTEM M AY BE UNDER HI GH PRESSURE. When adjusting the meter position or removing it,
be sure to hold the electronics enclosure firmly by hand before SLOWLY loosening the positioning
clamping nut. Failure to do this will allow the pressure to suddenly and rapidly force the meter from
the pipe causing serious injury. The meter could also be damaged or break apart causing a break in
the water seal with the resultant loss of large amounts of water. The hand effort required to hold the
meter will be 0.11 times the pipe pressure.
Begin by calculating the effort that will be required to hold the meter. Establish adequate footing
for this task, taking extra caution when working from a ladder or platform. Use the following
formula:
E = 0.11 x P Where:
E
= effort in pounds
P
= system pressure in pounds per square inch
Example: In a 300 PSI system, 33 pounds of effort is required to insert the meter into the pipe.
CAUTI ON
Do not release the flow meter until you have tightened the position clamping nut enough to hold the
flow meter in the desired position. This will require less torque than you might think, so be careful
not to overtighten it and risk damaging the adapter, nut or stem.
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