3.8.7

Q1

0.4085

D2

Q2

3.0560

D2

M

0.0510

p

.

D2

metres / second

mm

litre / min

m

2

/min

kg/h

kg/m

3

feet / second

inches

gal / min

ft

2

/ min

lb/h

lb/ft

3

RIM10 rotor selection guide

Liquid minimum and maximum velocity rates

All sizes

DN80 - DN125 (3 - 5")

DN200 (8") + Bigger sizes

Rotor

Flow units

Flowmetering

Turbine flowmeters

Selection of the RIM10 rotor model depends upon the fluid type and operating velocity range of the fluid.

-

For all liquids, the model L1 or L1B rotor, with a maximum velocity of 9 metres/second (30 feet/second), must be used.

Please note that the L1B is a bidirectional rotor.

-

For gases and steam, six different rotors are available with maximum velocities ranging from 16 - 53 metres/second

(55 - 175 feet/second) - See the Table below for the maximum velocity limits (V max.) for all rotors.

The RIM10 rotor will typically respond linearly over the velocity range from 'V lin' to 'V max' – within ±1.0% (±3.0% for the G6 rotor).

This is defined as the 'linear' range of the rotor. The minimum 'measurable' velocity (V min) can be considered the application minimum.

Velocities from 'V min' to 'V lin' are measurable and repeatable, but less accurate.

When determining the fluid velocity limits for a given rotor, the following equations can be used to compute fluid velocity.

Note: Rotors have moving parts that require periodic maintenance - See page 8, 'How to order replacement rotors'.

G6

(1" rotor)

G1 or G1B through G5 or G5B

L1 or L1B (1.5" rotor)

Average fluid velocities

Fluid

Liquid

Gas

Steam

Where:

V = Average fluid velocity

D = Pipe inside diameter

Q

1

= Liquid volumetric flow

Q

2

= Gas actual volumetric flow

M = Mass flowrate

V lin.

V min.

L1B

feet/second

30.0000

1.4000

0.5000

1.5000

0.6000

1.6000

0.7000

V max.

V lin.

V min.

metres/second

9.1440

0.4267

0.1524

0.4572

0.1828

0.4876

0.2133

L1 and

Gas or steam minimum and maximum velocity rates

Rotor

G1 and

G1B

G2 and

G2B

G3 and

G3B

G4 and

G4B

G5 and

G5B

G6*

Flow units

metres /second

feet /second

metres /second

feet /second

metres /second

feet /second

metres /second

feet /second

metres /second

feet /second

metres /second

feet /second

All sizes

V max.

16.76

55.00

21.34

70.00

25.91

85.00

35.05

115.00

44.20

145.00

53.34

175.00

DN80 - DN125 (3 - 5")

DN150 (6")

DN200 (8")

+ Bigger sizes

V lin.

3.89 /

3.19/

4.85 /

3.98 /

5.51 /

4.52 /

7.12 /

5.84 /

8.42 /

6.91 /

7.44/

6.10/

V min.

2.37 /

1.94/

2.76 /

2.26 /

2.95 /

2.42 /

4.69 /

3.85 /

5.57 /

4.57 /

N/A

V lin.

2.44 /

2.00 /

2.77 /

2.27 /

3.07 /

2.52 /

3.39 /

2.78 /

5.83 /

4.78 /

6.74 /

5.53 /

V min.

1.50 /

1.23/

1.99 /

1.63 /

2.38 /

1.95 /

3.46 /

2.84 /

4.23 /

3.47 /

N/A

ρ

Downloadable at www.spiraxsarco.com/us

TI-P198-01 MI Issue 5

RIM10 Series Rotor Insertion Flowmeters

Page 6 of 8

40° pitch

30° pitch

20° pitch

15° pitch

10° pitch

5° pitch

V lin.

1.83 /

1.50 /

2.32 /

1.90/

2.66 /

2.18/

3.66 /

3.00 /

4.32 /

3.54 /

6.10/

5.00 /

V min.

1.22/

1.00/

1.60 /

1.31 /

1.71 /

1.40 /

2.67 /

2.19 /

3.43 /

2.81 /

N/A

* Bi-directional calibration not available on the G6B rotor.

Note: All values in the above table are approximate and depend on the density of the fluid.

Vmax = Maximum velocity of fluid metres/second (feet/second)

V min = Minimum measurable velocity of fluid metres / second (feet / second)

Vlin = Minimum velocity of fluid at which rotor response is linear metres/second (feet/second)

= Density of fluid kg/m

3

(lb/ft

3

)

= Not applicable

N / A

Note: Measurable flowrates for your specific application are available using EMCOSIZE.

ρ

= Fluid density

DN150 (6")

V lin.

V min.