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10DS3111E INSTRUCTION MANUAL
2.4 Mounting
2.4.1 Orientation
The meter may be installed in horizontal, vertical or sloping pipe runs. However, precautions must be
taken to assure that the metering tube is filled at all times during measurement. A vertical installation,
with the pipe line carrying liquid upwards assures a filled line under low flow rate conditions and also
minimizes wear on the meter lining by abrasive grit. Horizontal installations should be made with the
meter in the lower section of a pipeline to assure a filled meter condition.
For horizontal or sloping installations the meter should be placed so that the electronic housing of the
meter is on top. This will align the meter electrodes in a lateral plane. Positioning the meter in this
way eliminates the possibility of entrained air acting as an electrode insulator.
The meter must be oriented in accordance with the direction of process flow, as indicated by the
FLOW arrow on the meter body. For accurate metering, a straight pipe run equivalent to a minimum
of three straight pipe diameters are required upstream of the meter for elbows and tees, measured
from the center of the meter (refer to Figure 2-15).
If a control valve is required, it is recommended that it be placed downstream of the meter. Upstream
valves can create turbulence that result in air pockets and may affect the meter's accuracy or cause
its output to be noisy. A minimum of ten pipe diameters of straight pipe are required upstream
between the meter and a control valve or pump.
2.4.2 Pipe Connections
The TEFLON and polyurethane lined meters
have raised faced flanges rated as specified. The
neoprene and hard-rubber lined meters have full
faced flanges rated as specified. Two flange gas-
kets are supplied per meter; the mounting studs
and nuts are furnished by the user.
For 4-bolt and 8-bolt flanges, tighten the flange
bolts in a "star" pattern as shown in FIGURE 2-13
to avoid localized stresses on the gaskets. Use a
similar method for 8-bolt flanges.
Refer to Figure 2-14 for proper gasket locations
and Figure 2-15 for recommended piping ar-
rangement.
The meter should be oriented such that the pres-
sure relief valve points in a safe direction should
a situation occur where the device could be acti-
vated. For further discussion of the pressure re-
lief mechanism and orientation, refer to Section
2.7 of this instruction manual.
FIGURE 2-13. BOLT TIGHTENING
SEQUENCE
2-16
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