Yokogawa EJA115 - Manual (Page 26)

IM 01C22K01-01E 5-2
5. INSTALLING IMPULSE PIPING
(2) Pipe Size for Process Piping
Use a 15 mm (1/2-inch) pipe for process piping
connection to the process connector.
(3) Preventing Freezing
If there is any risk that the process fluid in the trans-
mitter pressure-sensing assembly could freeze or
solidify, use a steam jacket or heater to maintain the
temperature of the fluid.
F0502.EPS
Manifold
Figure 5.1.2 Manifold Location at the Downside (for Gas
Flow Measurement)
F0503.EPS
Manifold
Figure 5.1.3 Manifold Location at the Upside (for Liquid
Flow Measurement)
5.2 Process Piping Connection
Examples
Figure 5.2 shows examples of typical process piping
connections. Before connecting the transmitter to the
process, study the transmitter installation location, the
process piping layout, and the characteristics of the
process fluid (corrosiveness, toxicity, flammability,
etc.), in order to make appropriate changes and
additions to the connection configurations.
Note the following points when referring to these
piping examples.
• The high pressure connecting port on the transmit-
ter is shown on the right (as viewed from the front).
• The transmitter process piping connection is shown
for a vertical impulse piping connection configura-
tion in which the direction of process flow is from
right to left.
• The process piping material used must be compat-
ible with the process pressure, temperature, and
other conditions.
• A variety of process piping-mounted stop valves are
available according to the type of connection
(flanged, screwed, welded), construction (globe,
gate, or ball valve), temperature and pressure.
Select the type of valve most appropriate for the
application.
Gas flow measurement
Liquid flow measurement
Union or flange
Union or flange
Stop valve
Stop valve
Manifold
Manifold
Process piping
Process piping
F0504.EPS
Figure 5.2 Process Piping Connection Examples