4210 Flow Meter
Section 4 Optional Equipment
4-27
CAUTION
The mounting ring may need anchoring. Under conditions of
high velocity (greater than five feet per second or 1.5 meters
per second), the mounting ring may not have sufficient out-
ward spring force to maintain a tight engagement with the pipe.
The ring may tend to lift off the bottom of the pipe in an oscilla-
tory fashion, or may even be carried downstream.
This problem is more prevalent in the larger diameter pipes
(10, 12, and 15 inch) and in pipes with a smooth inside surface
(for example, plastic). If any of these conditions are present, or
if movement of the mounting ring is detected or suspected, you
must anchor the ring in place. You can do this by shooting
studs through the ring into the pipe or by other appropriate
means. In some cases, it may be sufficient to simply increase
the outward spring force of the ring by bending it into a less
round configuration.
4.12.6 Installing the Universal
Mounting Ring
You can assemble the sections of the Universal Mounting Ring
together and lower the assembly into the manhole where instal-
lation is to take place. Or, you can assemble the parts at the
bottom of the manhole, whatever is most convenient to you. Do
not try to assemble the larger ring assemblies in pipes during
conditions of high flows. Always try to make installation during
times of lowest flow, both for reasons of greater ease of instal-
lation and for reasons of safety. The drawing on the next page
shows all the component parts of the Universal Mounting Ring
and what is needed to fit pipes sized from 18 to 72 inches in
diameter. It is reprinted here for your convenience.
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