A pair of the proper gaskets to suit the particular
lining option of the meter supplied is included within
the installation kit which accompanies the Magnetic
Flowmeter. Before connections are made, the bear-
ing surfaces of neoprene or polyurethane-lined me-
ter flanges, their neoprene gaskets and adjacent
pipeline flanges must be thoroughly dusted with tal-
cum powder. This is done to prevent possible dam-
age to the meter lining or gaskets, should the meter
be removed from the line.
If the Magnetic Flowmeter is to be mounted in a
non-conductive pipeline or a metal pipeline with an
insulating liner, the user must provide a pair of suit-
able gaskets between the customer-supplied annu-
lar meter grounding rings (discussed under Section
2.5.2) and the adjacent pipeline flange surfaces.
The standard coarse thread flange bolts supplied by
the user must be well lubricated and tightened in
even increments around the flange surface using a
"star" pattern as shown in Figure 2-4. Note that 14
through 24 inch meters will have a correspondingly
larger number of bolt holes as shown in Table 2-1.
Bolt torque should be limited to that which will produce a positive seal for the application. Recom-
mended mounting-bolt torque values are shown in Table 2-1 below.
TABLE 2-1. RECOMMENDED MOUNTING-BOLT TORQUES
Meter
Size
ANSI Class
150
ANSI Class
300
# of
Holes
Bolt Size
[Diam.]
(in.)
ft. lbs. Nm # of
Holes
Bolt Size
[Diam.]
(in.)
ft. lbs. Nm
14
12 1 120 160 20 1 1/8 215 125
16
16 1 115 155 20 1 1/4 310 175
18
16 1 1/8 175 240 24 1 1/4 335 195
20
20 1 1/8 155 210 24 1 1/4 400 215
24
20 1 1/4 220 300 24 1 1/2 675 335
Notes:
1. Torques listed are for bolts with threads lubricated.
2. All meters with PTFE liners need to be re-torqued after 48 hours of operation.
FIGURE 2-4. BOLT TIGHTENING
SEQUENCE
INSTRUCTION MANUAL 10DX3111A&G Sizes 14 - 24 Inches
2-7
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