60
Impulse pipe
Stop valve
Process pipe
Pressure source
Manual valve
Typical examples of piping
1- Gas measurement
Place the transmitter above the pressure source.
If high temperature, use drain pot like for steam.
Gas measurement
Differential pressure source is located
upper side of main process piping
(within 45
o
upward from vertical direction)
Differential pressure source is located
lower side of main process piping
(within 45
o
downward from horizontal direction)
Differential pressure source is located
upper side of main process piping
(within 45
o
upward from horizontal direction)
Liquid measurement
Steam measurement
Upper
Upper
Lower
45
d
45
d
45
d
45
d
45
d
Lower
45
d
Main process piping
Differential pressure source
6.2.2 Piping of pressure and absolute pressure transmitters (types
: FKG, FKA)
Removal of protective cap
The process connection port of the transmitter is
fi
tted with a protective cap. Before piping,
remove the cap carefully. When removing the cap, carefully protect the threaded portion
and sealing face from damage.
Connection of transmitter and impulse pipe
• Impulse pipe should be connected with an oval
fl
ange. Also, the pipe can directly be
screwed into the transmitter. Tightening torque of 7/16-20UNF mounting bolt in an oval
fl
ange should be 30 to 40 N·m (3 to 4 kgf·m).
• After connection, close the stop valve of transmitter in order to prevent foreign materials
from entering the inside.
Position of process taps (horizontal main process piping)
The position of the process tap is determined by the relationship between condition, charac-
teristics and measurement point of process
fl
uid. Note the following
fi
gures when planning
and installing the piping.
Impulse pipe
Manual valve
Process pipe
Pressure source
Stop valve
2- Liquide measurement
Place the transmitter above the pressure source.
The impulse pipes must be installed to not accumulate gas in
the transmitter.
Connecting a tank gas may be useful.
