User`s manual

<5. Installing Impulse Piping>
5-4
IM 01C25B01-01E
(7) Preventing Freezing
Ifthereisanyriskthattheprocessuidinthe
impulse piping or transmitter could freeze, use a
steam jacket or heater to maintain the temperature
oftheuid.
NOTE
After completing the connections, close the
valves on the process pressure taps (main
valves), the valves at the transmitter (stop
valves), and the impulse piping drain valves,
so that condensate, sediment, dust and other
extraneous material cannot enter the impulse
piping.
5.2 Impulse Piping Connection
Examples
Figure 5.5 and 5.6 show examples of typical
impulse piping connections. Before connecting the
transmitter to the process, study the transmitter
installation location, the process piping layout,
andthecharacteristicsoftheprocessuid
(corrosiveness,toxicity,ammability,etc.),inorder
to make appropriate changes and additions to the
connectioncongurations.
Note the following points when referring to these
piping examples.
• Thehighpressureconnectingportonthe
transmitter is shown on the right (as viewed
from the front).
• Thetransmitterimpulsepipingconnectionis
shown for a vertical impulse piping connection
congurationinwhichthedirectionof
connection is either upwards or downwards.
• Iftheimpulselineislong,bracingorsupports
should be provided to prevent vibration.
• Theimpulsepipingmaterialusedmust
be compatible with the process pressure,
temperature, and other conditions.
• Avarietyofprocesspressuretapvalves(main
valves) are available according to the type
ofconnection(anged,screwed,welded),
construction (globe, gate, or ball valve),
temperature and pressure. Select the type of
valve most appropriate for the application.
Tee
3-valve
manifold
Drain
valve
Orifice
Drain
plug
Tap
valve
Union
or flange
Liguid Gas
Condensate pot
Steam
F0505.ai
Figure 5.5 Impulse Piping Connection Examples
for Differential Pressure Transmitters
F0506.ai
Liquid Gas Steam
Union or flange
Tee
Tee
Drain plug
Drain valve
Drain valve
Drain plug
Union or flange
Union or
flange
Union or flange
Tap valve
Tap valve
Tee
Drain valve
Drain plug
Tap valve
Figure 5.6 Impulse Piping Connection Examples
forGauge/absolutePressure
Transmitters