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Ultrasonic Steam Flow Meter for High Temperature Superheated Vapor Processing
Quick Answer: A high temperature ultrasonic steam flow meter handles superheated vapor from DN15 up to DN300, with process temperatures up to 250 °C standard and 350 °C for special designs. It outputs mass flow in kg/h with pressure and PT100 temperature compensation. Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h for a budget quote.
Superheated steam measurement looks straightforward until a plant engineer sees the first installed error. Wet steam, wrong density data, or a meter rated for 120 °C leads to readings that drift within weeks. Silver Automation Instruments supplies ultrasonic steam flow meters for high temperature superheated vapor processing in Southeast Asia, Australia, Latin America, Africa, and the Middle East.
Most engineers skip this part. The actual vapor condition matters more than the line size. Saturated steam at 10 bar has a temperature around 184 °C. Superheated steam at the same pressure may sit at 280 °C or 320 °C. The meter body and transducers must survive that temperature and the pressure derating. Our inline ultrasonic steam flow meter uses stainless steel construction and high temperature transducers. We normally rate the measuring section at 250 °C standard and 350 °C for special designs.
Key Parameters for Superheated Vapor Flow Measurement
Before quote stage, the supplier needs five data points. Pipe size, operating pressure, operating temperature, flow range, and steam condition. A typical inquiry looks like this: pipe DN100, pressure 16 bar, temperature 300 °C, flow range 800 to 8000 kg/h, superheated steam. Based on those numbers we select the correct transducer frequency, meter body size, and density compensation method.
For pipe sizes below DN25, the flow velocity is often low and the meter needs a reduced bore section. For DN50 to DN300, a full bore inline ultrasonic meter works well. Above DN300, we check whether clamp-on or insertion ultrasonic sensors fit the customer site. In practice, most superheated vapor processing lines fall between DN40 and DN200. A paint manufacturer in Southeast Asia needed a DN80 meter for 12 bar steam at 290 °C. A food processing plant in Vietnam asked for a DN50 unit with clean-in-place requirements. These are common project sizes.
Why Standard Steam Meters Read Wrong
Pressure changes density. A cubic meter of steam at 5 bar and 180 °C has a different mass than the same volume at 15 bar and 220 °C. An ultrasonic flow meter measures volumetric flow rate. To output kg/h, the transmitter needs live density. We feed the meter with a 4-20 mA HART pressure signal or a PT100 temperature signal. The flow computer calculates density for superheated vapor using steam tables. Without this compensation, the error can reach 12 to 18 percent on a high temperature line.
Wet steam is another problem. Water droplets damage transducer coupling and create signal loss. Superheated vapor is dry by definition and works better with ultrasonic transit time measurement. That is why we ask for the degree of superheat. If the steam is only slightly superheated, condensation can still happen during startup. The meter installation should include a warm-up procedure and drip leg protection.
Installation Rules for High Temperature Steam Meters
Straight run upstream and downstream is not the only requirement. Here is the thing. Thermal expansion on a 250 °C pipe changes the alignment. We recommend stainless steel flange connections and a meter body with the same pressure rating as the line. The transducer ports should point horizontally when the steam runs horizontally. Air pocke
For high temperature superheated vapor processing, the meter is installed downstream of the superheater and before the point of use. The pipe should be insulated after the meter body but not over the transmitter. The electronics housing needs cooling air. We have seen customer sites where the transmitter temperature reached 85 °C and the display failed. A remote mount converter solves this in most plants.
Outputs and Integration
Standard outputs from our ultrasonic steam flow meter include 4-20 mA, pulse, RS485 Modbus, and HART. The transmitter displays total flow in kg or tonnes, actual flow in kg/h, temperature in °C, and pressure in bar when a pressure sensor is wired in. For hazardous area service, we supply ATEX Zone 1 or Zone 2 versions. The converter can be integral or remote. For steam lines above 200 °C, remote mount is the safer choice.
Silver Automation Instruments is the manufacturer and supplier. We provide engineering selection, wiring drawings, and after-sales help for ultrasonic steam flow meters in oil and gas, chemical, food, beverage, marine, and utility plants. We often export to customer sites in Indonesia, Thailand, Qatar, Kenya, Mexico, and Chile.
Price Factors and Delivery
Cost depends on pipe diameter, temperature rating, pressure rating, and approval type. A DN50 high temperature ultrasonic steam flow meter is less expensive than a DN200 ATEX Zone 1 version with a remote converter. The price changes because transducer size, flange rating, and material costs increase. We quote within 2 working days after receiving full process data.
Delivery from our factory in China normally takes 10 to 20 days for standard high temperature steam meters. Special high pressure designs above 40 bar or non-standard flange standards can take longer. We ship by air or sea to Australia, Southeast Asia, the Middle East, Africa, and Latin America. For urgent shutdown replacements, we can arrange faster dispatch.
FAQ
Can ultrasonic flow meters measure superheated steam?
Yes. Inline ultrasonic flow meters measure superheated steam reliably when the vapor is dry and the meter has pressure and temperature compensation. Clamp-on ultrasonic meters are less common for steam and are not our first recommendation for high temperature superheated vapor.
What is the maximum temperature for a steam ultrasonic flow meter?
Our standard high temperature ultrasonic steam meter handles 250 °C. Special designs with high temperature transducers can handle 350 °C. For process temperatures above 350 °C, we check the material and transducer limit case by case.
Do I need pressure and temperature compensation for steam mass flow?
Yes. If you need mass flow in kg/h or tonnes per hour, the meter must compensate live density. Use a 4-20 mA pressure transmitter and a PT100 temperature sensor connected to the flow converter.
What pipe sizes are available?
We supply inline ultrasonic steam flow meters from DN15 to DN300 as standard. Larger pipe sizes from DN350 to DN1200 can be evaluated with insertion or dedicated high temperature designs.
Can I get a quote without a model number?
Yes. Send us your pipe size in DN, steam pressure in bar, steam temperature in °C, flow range in kg/h, and whether the area is hazardous zone. We will select the meter and send a quotation.
For a specific ultrasonic steam flow meter quote for high temperature superheated vapor processing, send the process conditions to Silver Automation Instruments. Tel: +86-135-1213-1526. WhatsApp: 86-135-12131526. WeChat: +86 13512131526. Visit flow-meter.com.au for more product information.
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