YOKOGAWA AXFA14G - Page 16

<3. Installation>
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IM 01E20A01-01EN
(2) Mounting Centering Devices
Tomaintainconcentricityoftheowmeterwiththepipes,
install centering devices. From the process piping side,
pass two through-bolts through the four centering devices
(two for each bolt) and the adjacent two holes (the lower
twoholesforhorizontalmounting)ofbothoftheanges
(refer to Figure 3.3.4). Use the appropriate centering
devicesaccordingtothenominaldiameterandtheange
ratings. The centering devices are engraved with an
identifying character. Use the appropriate ones which
meettherequiredspecicationsbyreferringtoTable
3.3.10 and Table 3.3.11 (AXF standard models) and Table
3.3.12 (replacement models for the earlier ADMAG or
ADMAG AE).
(3) Positioning the Flowmeter
PositiontheowmetersothattheMini-angesandthe
centering devices come in close contact with each other.
Be careful to prevent the four centering devices from
coming into contact with the housing. If stud-type through-
bolts are used, position them in such a way that the four
centering devices come in contact with the bolt threads
(refer to Figure 3.3.4). Pass the other through-bolts
through from the process piping side.
NOTE
Precautions for size 125 mm (5 in.), 150 mm (6 in.),
replaceable electrode type
WheninstallingthistypeofowmeterwithJISF12
(JIS75M)anges,turntheowmeterslightlybecause
the cover of the electrode chambers will interfere with
the bolts.
(4) Tightening Nuts
Tighten the nuts according to the torque values for metal
piping in Table 3.3.7. For PVC piping, select an optional
code of GA, GC, or GD, use rubber gaskets and tighten
the nuts to the torque values for PVC piping in Table
3.3.8.
Forpermeableuids(suchasnitricacid,hydrouoric
acid, or sodium hydrate at high temperatures), tighten the
nuts according to the torque values in Table 3.3.9.
CAUTION
ForaowmeterwithuorocarbonPFAlining,itis
possible that the nuts may loosen as time passes,
so tighten them regularly. Be sure to tighten the nuts
according to the prescribed torque values. Tighten
them diagonally with the same torque values, step by
step up to the prescribed torque value.
F0316.ai
Centering device
(four units)
*Nut (eight units)
*Through-bolt
Piping-side flange
*Gasket (two units)
Mini
flange
*: These items can be ordered optionally.
If they are provided by the user, choose nuts and
bolts in compliance with the flange ratings.
Housing
Vertical mounting
Horizontal mounting
Figure 3.3.4 Mounting Procedure for Wafer Type (sizes: 50 to 300 mm (2.0 to 12 in.))
Installation
3