00809-0100-4835 Rev BD
2-6
• Use impulse piping of large enough diameter to avoid friction
effects and blockage
• Vent all gas from liquid piping legs
• Vent all liquid from gas piping legs
• When using a sealing fluid, fill both piping legs to the same level
• When purging, make the purge connection close to the process
taps and purge through equal lengths of the same size pipe –
avoid purging through the transmitter
• Keep corrosive or hot process materia
l out of direct contact with
the transmitter
• Prevent sediment deposits in the impulse piping
• Keep the liquid balanced on both legs of the impulse piping
• Avoid conditions that might allow process fluid to freeze within
the process flange
• Make sure the impulse piping is of adequate strength to be
compatible with anticipated pressure.
-2 for examples of the following mounting
• Place taps to the side of the line to prevent sediment deposits
on the process isolators.
• Mount the transmitter beside or below the taps so gases vent
into the process lines.
• Place taps in the top or side of the line.
• Mount the transmitter beside or above the taps to drain liquid
into the process line.
m Flow Measurement
• Place taps to the side of the line.
• Mount the transmitter below the taps to ensure that impulse
piping will remain filled with condensate.
• Fill impulse lines with water to prevent steam from contacting
the transmitter directly and to ensure accurate measurement
start-up. Condensate chambers are not typically necessary
since the volumetric displacement of the transmitter is
The mounting configurations described above and depicted in Figure 2-
2 are based on general
industry “best practice” recommendations.
Where applicable, specific plant approved installation practices should
be used.
In steam or other elevated temperature services, it is important that
temperatures at the process flanges not exceed 25
0
o
F (121
o
C). In
vacuum service, these limits are reduced to 220
o
o
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