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5.2 Pipe Design and Selection
The following should be taken into account when selecting a pipe:
5.2.1
Installation Environment
It’s better to install the flowmeter indoors; if you have to install it outdoors, you should take
measures to avoid direct sunlight or rainwater.
The flowmeter shall be installed away from high temperature, thermal radiation from
equipment or corrosive gas.
Ultrasonic flowmeters can’t be installed nearby motors, transformers or other power sources
that are easy to cause electromagnet interference. DO NOT install ultrasonic flowmeters
nearby frequency converters or DO NOT connect it with the distributing cabinet of frequency
converters to avoid interference.
In convenience for installation and maintenance, keep sufficient space around the flowmeter.
5.2.2
Support of Flow Meter
Avoid installing the flowmeter on pipes with mechanical vibrations. If you have to install it
there, DO take shock absorption measure. You could install a hose for transition, or set
support points with absorbing pads on the pipe at 2DN in both upstream and downstream of
the flowmeter. Try not to install the flowmeter on the longer overhead pipes because the
sagging of pipes would cause leakage between the flowmeter and the flanges. If you have to
do it, you must set support points on the pipe at 2DN in both upstream and downstream of
the flowmeter.
5.2.3 Requirements on Liquid-receiving Material
The ultrasonic flowmeter could measure single-medium liquid flow; The same medium could
be divided into three specifications (low temperature, high temperature and superhigh
temperature), different flowmeters should be used for different temperatures.
5.2.4 Dangerous Conditions
You could select the flowmeter with an explosion-proof housing, and intrinsic safety
explosion-proof flowmeter with intrinsic safety design circuit to ensure its safety and flame-
retardant operation. Each flowmeter should have a nameplate clearly identifying its
certifications. Please DO install and use the flowmeter according to the explosion-proof grade
and protection grade as shown on the nameplate.
