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Flexim Steam Flow Meter Technology for Non-Invasive High-Temperature Steam Volumetric Sizing
Quick Answer: Flexim clamp-on ultrasonic flow meters with WaveInjector measure steam flow up to 400 °C without cutting the pipe. For non-invasive high-temperature steam volumetric sizing, provide pipe outer diameter, wall thickness, material, steam pressure, temperature, and flow range. Silver Automation Instruments returns a model, price, and delivery time within 24 hours.
Why Clamp-On Measurement Works for Steam
Most engineers skip this part: a hot steam line rarely has a spare spool for a wetted flow element. A clamp-on ultrasonic meter avoids welding, shutdown, and pressure loss. We have seen this on customer sites in Thailand, Indonesia, and Vietnam. A 150 mm saturated steam header at 10 bar can be measured from the pipe outside surface in under two hours.
Here is the thing about steam. It is not like water. The pipe wall is hot, often above 200 °C. Standard ultrasonic couplant fails at that temperature. Flexim steam flow meter technology uses a solid metal WaveInjector. The transducer stays cool while the WaveInjector couples into the pipe wall. That design is the reason a non-invasive meter survives on a 350 °C steam line.
High-Temperature Steam Measurement Challenges
Steam density changes with pressure and temperature. Saturated steam at 12 bar has a different volume than superheated steam at 12 bar and 320 °C. For volumetric flow at operating conditions, the meter measures actual velocity and calculates volume flow from the pipe cross-section. No pressure compensation is needed. For standard volume or mass flow, add a pressure transmitter and a PT100 temperature sensor. We supply both from our instrument range.
Two-phase wet steam causes signal loss. Install the meter on a horizontal line with condensate removal upstream. A steam trap station before the measuring point helps. The pipe must be full of steam, not slugs of water.
Input Data for Steam Volumetric Sizing
You need to send six values for a correct quote. Pipe outer diameter, pipe wall thickness, pipe material, steam temperature, steam pressure, and minimum or maximum flow. In practice, most plants have the pipe size on the drawing and the pressure at the boiler. Temperature comes from the line gauge or a steam table. We use these values to calculate the acoustic path and select the right transducer pair.
For saturated steam lines from DN50 to DN300, we often recommend a Flexim-type FLUXUS G831 clamp-on ultrasonic meter with a WaveInjector pair. A common range we quote is DN50 to DN300 with temperatures up to 400 °C. For a 200 mm steam line at 16 bar and 250 °C, the typical velocity range is 5 to 35 m/s. That puts the meter inside the linear range of a clamp-on ultrasonic transducer. Send us your pressure in bar, temperature in °C, pipe size in DN, and
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Installation Notes That Affect Accuracy
Straight run matters. Keep 15D upstream and 5D downstream for most steam headers. One customer in a chemical plant in Malaysia had a 90 degree elbow only 4D from the meter. The reading shifted by 3 percent. After relocating the transducers to a better section, the flow rate matched the boiler feed water balance.
The pipe surface needs no cutting but it must be clean. Paint can stay if the layer is tight. Heavy rust or scale should be removed. Do not wrap the pipe with loose insulation under the transducers. The transducers need direct contact or a solid coupling path.
Signal Output and Control System Connection
A typical steam flow meter from us outputs 4-20 mA HART. You can wire it to a PLC, flow computer, or energy management system. For totalized steam volume, the meter also provides pulse or digital output. In a food processing plant in Indonesia, the maintenance team used the 4-20 mA signal to run the boiler feed pump. The same signal went to the SCADA historian for daily steam consumption reports.
FAQ: High-Temperature Steam Flow Volumetric Sizing
Q: Can a clamp-on meter handle superheated steam?
A: Yes. A clamp-on ultrasonic meter with a high-temperature pair handles superheated steam up to 400 °C. Give us the operating temperature before you buy.
Q: What pipe sizes can you measure non-invasively?
A: We cover DN50 to DN300 as standard. Smaller and larger lines are possible after an acoustic path check. Pipe material and wall thickness affect the final model.
Q: Does the meter need regular calibration?
A: Clamp-on ultrasonic meters do not drift like differential pressure meters. Many sites do an annual signal check. A wet calibration is not required for most steam applications.
Q: Can the meter measure mass flow in kg/h?
A: Yes. For mass flow, add a pressure transmitter and a PT100. The flow meter computes mass from volume, pressure, and temperature. We supply the complete package.
Q: How long does delivery take?
A: Stock models ship in 2 weeks. Configured high-temperature steam meters usually leave the factory in 4 to 6 weeks. We work with sites in Southeast Asia, the Middle East, and Latin America every week.
Contact Silver Automation Instruments for Steam Flow Sizing
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range. Include pipe material and wall thickness. Our engineers check the acoustic path calculation the same day. You receive a model, price, and delivery time for a non-invasive steam flow meter.
Call Silver Automation Instruments at Tel +86-25-68650347. WhatsApp +86-25-52155837. WeChat +86 15365082610.
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