Installing Dampening Material - GE TransPort PT878GC User Manual

Installing Dampening Material

GE Sensing strongly recommends applying DMP dampening
material in ALL clamp-on applications to help eliminate short
circuit noise. The material comes in two versions:
•
The DMP-1 self-adhesive sheet for applications up to
150°F (66°C). The material comes as two 9.5-in. (24 cm)
wide sheets cut in sufficient length to cover the pipe
circumference plus an additional tenth of a circumference.
The material can be cut with a utility knife, and comes with
a paper backing that is removed before installation.
•
The DMP-3 is a clay-like compound for all temperature
applications. If the temperature is over 150°F, the PDJ pipe
dampening jacket (available from GE Sensing with
preapplied DMP-3) must be used with the material.
At a minimum, you should consider applying dampening material
if you have any of the following conditions:
•
The distance from the nearest butt weld or pipe flange is
less than 10 ft (3 m);
•
The pipe size is under 4 in. (100 mm) diameter and the gas
pressure is 200 psig (14 barg) or lower;
•
The pipe is deformed,
•
The pipe is old, with a history of scaling or rust,
•
The pipe experiences condensation on the outside.
Note: Consult a GE Sensing flowmeter applications engineer or
sales engineer if you have any questions regarding
dampening material.
Installing the Dampening Material, Transducers and Fixtures
April 2009
3-25