Teledyne ADFM Hot Tap, Installation And Operation Manual, Page: 53 / 116

ADFM® Flow Meter
Section 2 Setup and Installation
2-33
Figure 2-33 Expand and secure the ring against the
channel wall
2.6.5 Large Flows and
Moving Debris
Under high velocity conditions (greater than five feet per second
or 1.5 meters per second) and/or moving debris, the ring may
require anchoring to keep it tight against the pipe. The flow
could lift the ring off the bottom of the pipe, or even carry it
downstream.
This problem is more prevalent in larger diameter pipes, and in
pipes with a smooth inside surface (plastic, for example). If any of
these conditions are present, or if movement of the spring ring is
suspected, anchoring the ring is highly recommended. This is
usually accomplished using threaded fasteners anchored or
driven into the wall of the channel, typically wedge anchors set
in a pre-drilled hole, or with a power actuated stud gun.
Please contact the factory for recommendations on installation in
manhole inverts, or in pipes larger than 80 inches in diameter.
2.6.6 Rectangular Channels In rectangular channels, the Pro20 sensor is commonly installed
using a flat mounting plate anchored to the channel floor, and/or
a removable rectangular frame inserted into guide slots in the
channel walls.
In some cases, particularly when the Pro20 sensor will be
installed using a diver or other special methods, the sensor will
be mounted on a rectangular plate, which is then anchored
directly to the channel floor.
Scissors mech.
Expand by tightening
scissors mechanism.