Yokogawa ADMAG AXR Uživatelský manuál stáhnout pdf (Strana 17)

<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 (refer to

Table 3.3.9). 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. Refer to Section

10.1 to do this properly.

Incasetheuidbeingmeasuredowsagainst

the arrow direction, refer to 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

f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 (refer to

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 option 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.

or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.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 193 194

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