Flowmetering Target flowmeters 3
Performance The TVA flowmeter has inbuilt electronics which give a density compensated output. An LCD display is incorporated within the electronics head. The M750 display unit can be used to provide a remote display function if required, utilising the 4 - 20 mA output. System uncertainty, to 95% confidence (2 STD): (in accordance with ISO 17025) ± 2% of measured value from 10% to 100% of maximum rated flow. ± 0.2% FSD, from 2% to 10% of maximum rated flow. Turndown : up to 50:1 As the TVA flowmeter is a self contained unit, the uncertainty quoted is for the complete system. Many flowmeters claim a pipeline unit uncertainty and for a true system uncertainty, the individual uncertainty values of any associated equipment, such as DP cells, need to be added to the pipeline value.
Pressure drop The pressure drop across the TVA is nominally 750 mbar (300 ins water gauge) at maximum rated flow for the DN50, and 500 mbar (200 inches water gauge) for the DN80 and DN100.
3.3 5
TVA flowmeter flow capacities and pressure drops
QE litres / min
Maximum DP
Flowmeter type
Maximum
Minimum
Wg
m bar
DN50 DN80 DN100
300
3
300
750
770
8
200
498
1 200
12
200
498
Sizing the TVA flowmeter for saturated steam (kg/h) (Horizontal orientation) Maximum flowrates in kg/h at different pressures (bar g). Notes: 1 - Maximum steam flowrates are calculated at maximum differential pressure. 2 - The table below is a guide only. 3 - For superheated capacities please use the sizing software on our website www.spiraxsarco.com
Size Steam pressure bar g 1
3
5
7
10 12
15 20 25 30 32 bar g
Max. flow
619 859 1 042 1 196 1 395 1 513 1 676 1 918 2 135 2 335 2 409 kg / h
DN50 Q E = 300
Min. flow
kg / h
12
17
21 24 28 30 33 38 43 47 60
Max. flow
1 588 2 204 2 674 3 070 3 581 3 885 4 301 4 922 5 480 5 994 6 183 kg / h
DN80 Q E = 770
Min. flow
kg / h
32 44 53 61 72 78 86 98 110 120 128
Max. flow
2 475 3 435 4 167 4 784 5 581 6 054 6 703 7 671 8 540 9 341 9 637 kg / h
DN100 Q E = 1 200
Min. flow
kg / h
49 69 83 96 112 121 134 153 171 187 192
TI-P192-01 MI Issue 4
Page 5 of 6
TVA Flowmeter for Saturated and Superheated Steam Service
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