ADS Environmental Services Model 3600 530002 A2 - Manual (Page 70)

Ring, Sensor, and Special Installations 4-37
l Flow Depth If the pipe is large and flow levels deep during minimum flows
the velocity band may not reach the other side of the pipe. (Securing two bands
together may give the necessary length, but the installation will become more
difficult.)
l Silt If there is excessive silt present in a large pipe, it will hamper the
installation of the band. Removing massive silt amounts in a large deep line is
usually impractical.
"C" or 3/4 Ring Velocity Special
ADS-3004
Front View Typical Pipe
D.
B.
C.
A.
3/4 Ring
Velocity
Sensor
Crown
Invert
Flow Line
Point E.
Anchor
Bolt
(1 of 4)
l Position the velocity band so the sensors are in the flow below minimum flow
depth. (This ensures the sensors will not come out of the flow at night.)
l Position the band so that two of the pre-drilled holes are visible on the opposite
side of the pipe. Maneuver the band until the lowest hole is almost at water
level and spot mark with a drill.
l Drill and mount the anchor bolt onto the pipe wall with a pneumatic drill.
l Attach the band to the anchor bolt and secure it with a washer and 7/16 in. (11
mm) nut.
l Apply a downward pressure to the long end of the band and hold the band in
place with foot pressure.
l Verify that the band and sensors are flush with the pipe surface.