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(2) Position of Process Pressure Taps and XS530
If condensate (or gas) accumulates in the impulse piping, it should be
removed periodically by opening the drain (or vent) plugs. However, this
will generate a transient disturbance in the pressure measurement, and
therefore it is necessary to position the taps and route the impulse piping
so that any extraneous liquid or gas generated in the leadlines returns
naturally to the process piping.
• If the process fluid is a gas, then as a rule the XS530 must be located
higher than the
• If the process fluid is a liquid or steam, then as a rule the XS530 must be
located lower than the process pressure taps.
(3) Impulse Piping Slope
The impulse piping must be routed with only an upward or downward
slope. Even for horizontal routing, the impulse piping should have a slope
of at least 1/10 to prevent condensate (or gases) from accumulating in the
pipes.
(4) Preventing Freezing
If there is any risk that the process fluid in the impulse piping or XS530
could freeze, use a steam jacket or heater to maintain the temperature of
the fluid.
NOTE
After completing the connections, close the valves on the process
pressure taps (main valves), the valves at the XS530 (stop valves), and the
impulse piping drain valves, so that condensate, sediment, dust and other
extraneous material cannot enter the impulse piping.
<Installing Impulse Piping>
IM 01W06F01-01EN
5-2
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