Flowmetering Turbine flowmeters 3
Water flowrates
m 3 /hr GPM Minimum Maximum Minimum Maximum
Size
80 mm 3" 150 mm 6" 200 mm 8" 300 mm 12" 400 mm 16" 600 mm 24"
2.62
157.0 614.0
12
691
12.30 24.80 56.00 87.60
54
2 701 4 678
1 062.0 2 402.0 3 753.0 8 538.0
109 247 386 877
Nominal pipe size
10 575 16 524 37 590
199.00
Sizing considerations
Straight run piping requirements One 90 ° elbow before the flowmeter Two 90 ° elbows before the flowmeter
Upstream Downstream
10 D 15 D 30 D 10 D
5 D 5 D 5 D 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.
Piping conditions
Two 90 ° elbows out of plane before the flowmeter
Reduction before the flowmeter
3.7 11
Expansion before the flowmeter
20 D
5 D
Partially open valve
30 D
5 D
Maximum 9 m/s (30 ft/s) Minimum 0.15 m/s (0.5 ft/s)
Liquid
Velocity range
Maximum m/s (43 to 205 ft/s) depending on rotor pitch Minimum 1 to 3.7 m/s (3.5 to 12 ft/s) depending on rotor pitch
Gas or steam
Other installation considerations
Mounting position: The RIM20 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 RIM20 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 Extended length removable retractor – For use with extended length probes
Removable retractor options
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).
How to order example: 1 off Spirax Sarco RIM20 - Removable retractor.
Rotor assembly, liquid, 40° pitch
L40 R10 R15 R20 R25 R30 R40
Rotor assembly, steam/gas, 10° pitch Rotor assembly, steam/gas, 15° pitch Rotor assembly, steam/gas, 20° pitch Rotor assembly, steam/gas, 25° pitch Rotor assembly, steam/gas, 30° pitch Rotor assembly, steam/gas, 40° pitch
Replacement rotors Rotor spares
How to order example: 1 off Spirax Sarco RIM20 - L40 – Rotor Assembly.
TI-P198-04 CMGT Issue 5
Page 11 of 13
RIM20 Rotor Insertion Flowmeter
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