Flowmetering Vortex flowmeters 3
Water flowrates
m3 / hr
GPM
Size
Minimum
Maximum
Minimum
Maximum
80 mm 3" 150 mm 6" 200 mm 8" 300 mm 12" 400 mm 16" 600 mm 24"
5.2
157
20.6
618
20.4
614
81.3
2 437
35.4
1 062
142.0
4 270
Nominal pipe size
79.2
2 337
317.0
9 501
125.0
3 753
501.0
15 043
284.0
8 537
1 138.0
34 144
Sizing considerations
Straight run piping requirements
Upstream
Downstream
One 90 ° elbow before the flowmeter
10 D
5 D
Two 90 ° elbows before the flowmeter
15 D
5 D
3.6 9
Two 90 ° elbows out of plane before the flowmeter
25 D
5 D
Piping conditions
Reduction before the flowmeter
10 D
5 D
Expansion before the flowmeter
20 D
5 D
Partially open valve 5 D D = Internal diameter of the pipe - If there is not a sufficient straight run of pipe, a flow rectifier may be used to reduce the above diameter measurements. Consult your local Spirax Sarco representative or the factory for your specific application. 25 D
Maximum
9 m/s
(30 ft /s)
Liquid
Minimum
0.3 m/s
(1 ft /s)
Maximum
90 m/s
(300 ft /s)
Velocity range
6.1
5
Gas or steam
density ( ) kg m 3
density ( ) lb ft 3
Minimum
Other installation considerations: - Mounting position
The VIM20 may be installed in vertical, horizontal, or angled pipe sections. The flowmeter is attached perpendicular to the axis of the pipe and should not be mounted 'upside-down' (with its top section hanging below the pipe mount). For liquid service, the fluid must completely fill the pipe. - Site selection The flow measurement location should be selected to minimize turbulence and swirl. The extent of these flow disturbances depends upon the piping configuration. Valves, elbows, pumps, and other piping components may add disturbances to the flow. - Hot-tap compatibility With the removable or permanent retractor assembly the VIM20 is ‘hot-tappable’ and can be installed and removed without shutting down the process. An isolation valve with a pipe mounting kit is used to isolate the flowmeter from the process.
Accessories
Removable Retractor For models without a permanent retractor, one removable retractor must be used if the process pressure is >3.4 bar g (50 psi g).
Removable retractor Extended length removable retractor – For use with extended length probes
Removable retractor options
How to order example: 1 off Spirax Sarco VIM20 - Removable retractor.
TI-P339-07 CMGT Issue 4
Page 9 of 11
VIM20 Vortex Insertion Flowmeter
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