[15]
98MANALIDP10AV Rev. A 8/16/11
Installation of Flow Measurement Piping
Figure 5 and Figure 6 show typical installations with horizontal and vertical process pipes.
The transmitters are shown below the level of the pressure connections at the pipe (usual arrange-
ment, except for gas flow without a seal liquid), and with filling tees in the lines to the transmitter
(for a seal liquid).
If the process fluid being measured must not come in contact with the transmitter, the transmitter
lines must be filled with a suitable seal liquid (see procedure in next section). In such a case, the
transmitter must be mounted below the level of the pressure connections at the pipe. With steam
flow, the lines are filled with water to protect the transmitter from the hot steam. The seal liquid
(or water) is added to the lines through the filling tees. To prevent unequal heads on the transmit-
ter, the tees must be at the same elevation (as shown in Figure 5) and the transmitter must be
mounted vertically (as shown). If a seal liquid is not required, elbows can be used in place of the
tees.
Tighten drain plugs and optional vent screws to 20 N m (15 lb ft). Tighten the four process con-
nector bolts to a torque of 61 N m (45 lb ft).
Note that the high and low pressure sides of the transmitter are identified by an L-H marking on
the side of the sensor above the warning label as shown in Figure 3.
With medium-viscosity seal liquids and/or long transmitter lines, larger valve sizes should be used.
NOTE
1.
With a horizontal line, pressure connections at the pipe should be at the side of
the line. However, with gas flow without a seal liquid, connections should be at top
of line.
2.
With a vertical line, flow should be upwards.
3.
For liquid or steam flow, the transmitter should be mounted lower than
the pressure connections at the pipe.
4.
For gas flow without a seal liquid, the transmitter should be mounted above
the pressure connections at the pipe; for gas flow with a seal liquid, the
transmitter should be mounted below the pressure connections.
5.
Viatran recommends the use of snubbers in installations prone to high levels of
flow pulsations.
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