YOKOGAWA ADMAG AXR - 3.3 Mounting Procedures; 3.3.1 Nominal Diameter 25 mm (1.0 in.) to 40 mm (1.5 in.), Wafer Type

<3. INSTALLATION>
3-5
IM 01E30D01-01EN
3.3 Mounting Procedures
NOTE
• Thetighteningtorquevaluetowhichgaskets
must be tightened varies depending on the
type and external dimensions of the lining
and the gasket. In this section, the tables
indicating tightening torque values include
the corresponding gasket types. The internal
diameters of the gaskets are close to those
of the grounding rings.
• Foruidscapableofpotentially
permeating PFA linings (such as nitric acid,
hydrouoricacid,orsodiumhydrateathigh
temperatures), different tightening torque
values must be applied. The tables of these
torque values is indicated in this section.
• Forbothlaylengthcode1andlaylength
code 2, the tightening torque values in
the tables can be applied if their process
connections, the lining types, and the
nominal sizes are the same.
3.3.1 Nominal Diameter 25 mm (1.0 in.) to
40 mm (1.5 in.), Wafer Type
IMPORTANT
Useboltsandnutsincompliancewiththeange
ratings. When stud-type through-bolts are used,
be sure the outside diameter of the shank is
smaller than that of the thread ridge. Be sure to
choose a gasket with inner and outer diameters
that does not protrude inside the piping (Read
Subsection 3.3.4). If the inner diameter of the
gasket is too large, or outer diameter of the
gasketistoosmall,uidleakagemayresult.
(1) Mounting Direction
Mounttheowmetersothattheowdirectionofthe
uidtobemeasuredisinlinewiththedirectionof
thearrowmarkontheowmeter.
IMPORTANT
If it is impossible to match the direction of
the arrow mark, the direction of the electrical
connection can be changed. Read Section 11.1
to do this properly.
Incasetheuidbeingmeasuredowsagainst
the arrow direction, read the parameter J20:
Flow Direction in this user’s manual.
(2) Mounting Centering Devices
Tomaintainconcentricityoftheowmeterwiththe
pipes,installcenteringdevicesontheMini-anges
oftheowmeter.Usetheappropriatecentering
devices according to the nominal diameter and the
angeratings.
(3) Positioning the Flowmeter
Pass two through-bolts through the adjacent holes
ofbothangesandpositiontheowmetersothat
theMini-angesandthecenteringdevicescome
in close contact with each other. Pass the other
through-bolts through the other holes (Read Figure
3.3.1). In case stud-type through-bolts are used,
position them in such a way that the centering
devices come in contact with the bolt threads.
(4) Tightening Nuts
Tighten the nuts according to the torque values for
metal piping in Table 3.3.1. 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 3.3.2.
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 3.3.3.
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.