Spiraflo Steam Flowmeters - Spirax Sarco
Spiraflo Steam Flowmeters - Spirax Sarco Spiraflo Steam Flowmeters - Spirax Sarco
6 M111 series transducer This is fitted in the steam line and provides analogue flow and temperature signals to the M322 signal conditioning unit. These units must be fitted within two meters of each other. EL2600 pressure transmitter Only required for superheat conditions. Provides 4 - 20 mA pressure signal to the M322 signal conditioning unit. M322 signal conditioning unit Converts flow, pressure and temperature signals into digital form for transmission to M210G flow computer which can be located up to 300 metres away. EL2600 pressure transmitter Separator ➤ Isolating valve M322 signal conditioning unit The ability of any flowmeter to perform to specification and give years of trouble-free service is, to a large degree, governed by the way it is installed. This is especially true for steam systems where there are always potential difficulties from surges and waterhammer arising from poor line drainage. Whatever kind of flowmeter is used, it is essential to install it properly:- System details Y-type strainer Installation Air vent ➤ D ➤ ➤ Trapping set M210G series flow computer Executes all the necessary calculations to provide density compensation. Gives local display of rate, total, pressure and temperature. Provides timer functions, programmable outputs and alarms. ➤ 6 D Minimum M111 series transducer ➤ Spiraflo meter M210G series flow computer Ensure adequate lengths of upstream and downstream straight pipe (only six pipe diameters upstream and three downstream are required for the Spiraflo). Install a steam separator and strainer upstream of the flowmeter to give good steam quality and help avoid waterhammer. Provide adequate steam trapping. Avoid installing the flowmeter immediately downstream of a pressure reducing valve. Avoid rapid actuation valves. Avoid reverse flow by fitting a check valve. ➤ 3 D ➤ Minimum ➤ Check valve ➤ ➤ ➤
Flow capacities for saturated steam Steam pressure (bar g) Size Flowrate kg / h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 a) Maximum 610 740 845 940 1 020 1 100 1 175 1 240 1 300 1 365 1 425 1 480 1 530 1 585 1 635 1 685 1 730 DN40 b) At 35 m / s velocity 180 260 350 420 500 580 660 740 820 900 970 1 050 1 120 1 200 1 275 1 350 1 440 c) Minimum 15 18 21 23 25 27 29 31 33 34 36 37 38 40 41 42 43 a) Maximum 955 1 155 1 320 1 470 1 600 1 720 1 830 1 940 2 035 2 130 2 225 2 310 2 395 2 475 2 555 2 630 2 705 DN50 b) At 35 m / s velocity 280 410 540 660 790 910 1 030 1 150 1 275 1 400 1 520 1 640 1 760 1 870 1 990 2 100 2 250 c) Minimum 25 28 33 37 40 43 46 48 51 53 56 58 60 62 64 66 68 a) Maximum 2 445 2 955 3 380 3 755 4 095 4 400 4 690 4 960 5 215 5 460 5 690 5 915 6 130 6 335 6 540 6 730 6 920 DN80 b) At 35 m / s velocity 720 1 050 1 375 1 695 2 010 2 330 2 640 2 945 3 265 3 580 3 885 4 195 4 490 4 800 5 105 5 415 5 755 c) Minimum 60 74 84 94 102 110 117 124 130 136 142 148 153 158 163 168 172 a) Maximum 3 820 4 615 5 285 5 870 6 395 6 880 7 330 7 750 8 150 8 530 8 895 9 240 9 575 9 900 10 215 10 515 10 815 DN100 b) At 35 m / s velocity 1 125 1 640 2 145 2 645 3 140 3 640 4 125 4 600 5 100 5 590 6 070 6 555 7 020 7 495 7 980 8 460 9 000 c) Minimum 95 115 132 147 160 172 183 194 204 213 222 231 239 247 255 263 270 Notes on the above table The steam meter will continue to give a reading up to the maximum value in the above table. However, the steam flow velocities at these maximum flowrates could be extremely high (up to 120 m /s at the low pressures and up to 42 m /s at the high pressures) and could lead to serious erosion damage both to the transducer and to the associated pipework and fittings. It is not recommended that a flowmeter is selected to operate at flowrates continuously resulting from a velocity above 35 m /s. Flow capacities for superheated steam In general terms, the flow capacity for the transducer is calculated using the following equation:- Q = AV Sv x 3600 Where :- Q = Capacity in kg / h A = Pipe cross sectional area in m² V = Flow velocity in m / s Sv = Specific volume in m³ /kg Approximate dimensions and weights (mm, kg). M111 series transducer PN BS10 ANSI ANSI JIS 25 H 150 300 20 Size A A A A A C D E F Weight DN40 176 175 175 181 176 180 100 76 28 9.5 DN50 180 178 178 184 176 180 100 76 28 10.5 DN80 240 236 240 249 236 220 152 76 76 25.0 DN100 260 263 260 276 260 220 152 76 76 34.5 E EL2600 pressure transmitter EL2600 A B C D E Weight 73 50 36 13 30 0.1 U - syphon and isolating valve F G H J K L M Weight 297 160 70 170 145 69 25 0.5 C D C D A A E B K M F G L H J F Turndown of the transducer is defined as the maximum flow divided by the minimum flow: using the maximum figures from the above table, the turndown is 40:1 throughout the size and pressure range. However, based on the recommended maximum velocity of 35 m/s, the turndown available will vary from 12:1 at 1 bar g up to 33:1 at 17 bar g. The average continuous turndown of the flowmeter is therefore 25:1. The saturated steam flow capacities in the above table are calculated using this equation. Superheated steam flow capacities can be calculated in the same way. Example: What is the capacity of a DN80 transducer on superheated steam at 5 bar g and 200°C. Assume maximum velocity = 35 m / s Sv = 0.4252 m³ / kg. Q = 3.14 x 0.08 x 0.08 x 35 x 3600 = 1 489 kg / h 4 x 0.4252 M322 signal conditioning unit A B C D E F G H I Weight 250 175 75 198 232 27 40 85 130 0.8 G H I B A F M210G series flow computer Wall mounting A B C D E F G H J K Weight 185 138 170 50 130 170 100 20 92 52 1.9 Panel mounting A B C D E F Weight 192 144 156 140 186 40 1.7 E B B A A F C C H C D E J K K J D F E D E 7
- Page 1 and 2: Spiraflo Steam flowmeters
- Page 3 and 4: Flowrate, kg / h Good turndown - es
- Page 5: Heavy duty, precision made nickel c
6<br />
M111 series transducer<br />
This is fitted in the steam line and provides analogue<br />
flow and temperature signals to the M322 signal<br />
conditioning unit. These units must be fitted<br />
within two meters of each other.<br />
EL2600 pressure transmitter<br />
Only required for superheat conditions.<br />
Provides 4 - 20 mA pressure signal to the M322<br />
signal conditioning unit.<br />
M322 signal conditioning unit<br />
Converts flow, pressure and temperature signals into<br />
digital form for transmission to M210G flow computer<br />
which can be located up to 300 metres away.<br />
EL2600<br />
pressure<br />
transmitter<br />
Separator<br />
➤<br />
Isolating valve<br />
M322 signal<br />
conditioning unit<br />
The ability of any flowmeter to perform to specification<br />
and give years of trouble-free service is, to a large<br />
degree, governed by the way it is installed. This is<br />
especially true for steam systems where there are<br />
always potential difficulties from surges and<br />
waterhammer arising from poor line drainage.<br />
Whatever kind of flowmeter is used, it is essential to<br />
install it properly:-<br />
System details<br />
Y-type<br />
strainer<br />
Installation<br />
Air vent<br />
➤<br />
D<br />
➤<br />
➤<br />
Trapping set<br />
M210G series flow computer<br />
Executes all the necessary calculations to provide<br />
density compensation. Gives local display of rate,<br />
total, pressure and temperature. Provides timer<br />
functions, programmable outputs and alarms.<br />
➤<br />
6 D<br />
Minimum<br />
M111<br />
series transducer<br />
➤<br />
<strong>Spiraflo</strong> meter<br />
M210G series flow computer<br />
Ensure adequate lengths of upstream and<br />
downstream straight pipe (only six pipe diameters<br />
upstream and three downstream are required for<br />
the <strong>Spiraflo</strong>).<br />
Install a steam separator and strainer<br />
upstream of the flowmeter to give good steam<br />
quality and help avoid waterhammer.<br />
Provide adequate steam trapping.<br />
Avoid installing the flowmeter immediately<br />
downstream of a pressure reducing valve.<br />
Avoid rapid actuation valves.<br />
Avoid reverse flow by fitting a check valve.<br />
➤<br />
3 D ➤<br />
Minimum<br />
➤<br />
Check valve<br />
➤<br />
➤<br />
➤
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