Dwyer ULSS User Manual
Page 23
Rev 5
MN890570
23 of 30
INSTALLATION
Step Nine
5. Stand Pipe: A standpipe maybe used to dampen turbulence or when foam is present in the
application.
a. Pipe can be made of any material.
b. Select a minimum 3” ID pipe for the stand pipe.
i. A 2” pipe is usable with the Series ULSS & ULSM, but is the minimum.
ii. Pipes larger than 3” can also be used.
c. Use a coupling and reducer bushing to attach the Series ULS to the pipe.
i. Be sure to use a plastic reducing bushing such as ULS‐ACC‐121 (2” T x 1” T) fitting or the
ULS‐ACC‐221 (2” S x 1” T) fitting.
ii. For the Series ULSL, use a reducer bushing such as ULS‐ACC‐131 (3” T x 2” T) fitting or
the ULS‐ACC‐231 (3” S x 2” T) fitting.
d. The pipe length should run the measurement span and the bottom of the pipe should remain
submerged at all times to prevent foam from entering the pipe.
e. Cut a 45° notch at the bottom of the pipe and drill a 1/4”pressure equalization hole in the dead
band.
f. The pumps should not drive liquid past the open end of the stand pipe which causes the liquid
in the pipe to oscillate.