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Installation and initial operation
Table 2-1:
Nominal line
size
6"
8"
10"
12"
16"
18"
20"
24"
Meter Tubes can be supplied with any type of line connection, in special materials and to
any specified length.
Illustrations show a two-section meter tube with a line type vane and a three-section tube
with a flange type vane. It is recommended that the flange type be used, as it can be easily
removed for inspection; and, by using the three-section tube with the spacer and jack
screws, the meter can also be easily removed from the line. The Illustration shows flanged
outer ends. Other end connections may be supplied.
NOTICE
Emerson Process recommends installation of strainers upstream of the meter. Flow control
valves should be located downstream of the meter.
2.5
Back pressure
Back pressure is the operating pressure measured five pipe diameters downstream of the
meter. To prevent cavitation, the minimum back pressure should be twice the pressure
drop across the meter at maximum flow plus 1.25 times the absolute vapor pressure
(@100°F) of the fluid. This formula should be used until the back pressure reaches 75-100
PSI above the vapor pressure and remain at 100 PSI for anything higher.
Piping should not allow passage of air, or vapor pockets in the flow stream. This will
overspin the rotor causing damage to the rotor and bearings.
12
Minimum recommended dimensions
S
U
1' - 6"
3' - 6"
2' - 0"
4' - 8"
2' - 6"
5' - 10"
3' - 0"
7' - 0"
4' - 0"
9' - 4"
4' - 6"
10' - 6"
5 - 0"
11' - 8"
6' - 0"
14' - 0"
(continued)
A
D
1' - 2"
2' - 6"
1' - 4"
3' - 4"
1' - 8"
4' - 2"
2' - 0"
5' - 0"
2' - 6"
6' - 8"
3' - 0"
7' - 6"
3' - 4"
8' - 4"
4' - 0"
10' - 0"
"PT" Liquid Turbine Meters
OA
8' - 8"
11' - 4"
14' - 2"
17' - 0"
22' - 8"
25' - 6"
28' - 4"
34' - 0"
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