Flowserve V901 VariCool Desuperheater - Manual (Page 4)

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1.4 Physical requirements
• For an optimal operation, the steam speed should be 10 to 100 m/s / 30 to 300 ft/s
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• To avoid condensate the set temperature should be 5 to 10 °C / 41 to 50 °F
above the saturated steam temperature.
• Max. operating temperature 530 °C / 986 °F
• Recommended cooling media temperature 120 °C / 248 °F
• Cooling media pressure 5 to 10 bar / 76 to 145 psi (see nozzle table) up to
max. 90 bar / 1300 psi above steam pressure.
• We recommend the installation of a strainer into the cooling media pipe
(mesh size 0,1mm / 0.004 inch)
• Minimum steam pipe diameter 150 mm / 6 inch
• Recommended straight pipe after injection nozzle valve: 0,1 x steam speed
min. 4 to 6 m / 13 to 20 ft
• The distance of the temperature sensor should be 0,2 x steam speed or min. 9 m / 30 ft
• The position of the temperature sensor is important for the measuring quality
Pay attention to the mounting instruction of the sensor supplier
1.5 System requirements
• System drawing with design recommendation Experience shows that deviations result in
considerable problems. A stratification of temperature zones is a frequent phenomenon
in large steam piping networks. We recommend the installation of 2 to 3 temperature
sensors with average value calculation.