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Krohne Vortex Flow Meter Manual: Multivariable Prowirl Sizing for High-Temp Saturated Steam
Quick Answer: A multivariable vortex flow meter for high-temp saturated steam must measure flow velocity, temperature, and pressure at the same point. Use the Krohne Prowirl sizing method to check pipe inner diameter, flow range, Reynolds number, and sensor temperature limit. For saturated steam from 15 bar g to 25 bar g in DN25 to DN100 pipes, a Prowirl 200 or Prowirl 400 style meter with built in compensation gives direct mass flow in kg/h.
What the Manual Checks First
The Krohne vortex flow meter manual for the Prowirl multivariable series starts with process data. You list the fluid, operating pressure, operating temperature, pipe size, and flow range. High-temp saturated steam has one fixed relationship. Pressure sets temperature. A 16 bar g line runs around 204°C. A 23 bar g line runs around 220°C. A multivariable meter can cross-check that saturation state and flag process errors.
In practice, most process engineers skip the manual and go straight to the sizing tool. That is fine, but you still need accurate pipe inner diameter. A DN40 schedule 80 pipe has a smaller inner diameter than a DN40 schedule 40 pipe. Enter the wrong inner diameter and the flow velocity shifts. The sizing result then gives you the wrong flow range.
Data You Must Send for Sizing
We have seen requests from Thailand, Vietnam, and Saudi Arabia for high pressure steam systems in food processing, chemical, and textile plants. The data that matters is the same every time: flow range in kg/h, pressure in bar g, temperature in °C, pipe size in DN, and turndown requirement. State the minimum flow you need to read. A meter sized only for maximum flow often loses low flow accuracy during weekend operation or reduced boiler load.
For a typical 20 bar g saturated steam line at 215°C in DN80, a multivariable vortex meter should read from about 400 kg/h to 8000 kg/h with compensated output. Always give the minimum and maximum flow. Do not just give the boiler nameplate capacity.
Why Multivariable Sizing Beats Separate Devices
A separate orifice plate, pressure transmitter, temperature sensor, and flow computer works, but it creates more leak points and wiring. A multivariable Prowirl style meter measures velocity, pressure, and temperature inside one body. The transmitter calculates density and outputs mass flow directly. This is practical for high-temp saturated steam because the density changes quickly when boiler pressure drifts.
For saturated steam, temperature alone can define density. But if the steam picks up some superheat or the pressure control cycles, a temperature-only meter can read the wrong mass flow. The pressure input corrects that. Because of this, the Krohne Prowirl manual recommendation for steam above 10 bar g is to use the multivariable input.
Common Sizing Mistakes on High-Temp Stea
One mistake is using a liquid vortex meter on steam. The sensor body may handle the temperature, but the flow range and output are wrong. Another mistake is ignoring the minimum Reynolds number. For steam vortex measurement, a Reynolds number below 20000 can cause the meter to read low or become unstable. Oversized pipe makes this problem worse.
We have seen many DN100 steam headers sized for future capacity. At current loads, the velocity is below 3 m/s and the vortex meter cannot form stable vortices. So before you order, check the actual minimum flow. Pressure loss at maximum flow is another point. In high-temp steam, a reduced bore or tight process connection can create excessive pressure drop.
Silver Instruments Multivariable Vortex Options
Silver Instruments supplies multivariable vortex flow meters for saturated and superheated steam in pipe sizes from DN15 to DN300. The meters have built in pressure and temperature sensors and output 4-20 mA HART or Modbus. For high-temp saturated steam above 230°C, specify the high temperature sensor option. Standard models cover up to 240°C. High temperature versions cover higher process temperatures.
If you need a Krohne Prowirl equivalent, send us the exact pipe size, steam pressure, temperature, and flow range. We will provide a like for like model with the same process connection and output wiring. This works for plant upgrades in Singapore, Indonesia, UAE, Nigeria, and Chile. We ship from stock for common DN25 to DN100 sizes.
FAQ
What does multivariable mean on a vortex flow meter for steam?
A multivariable vortex meter has one vortex sensor plus integrated pressure and temperature sensors. It calculates steam density and outputs mass flow without a separate flow computer.
Can a vortex meter measure saturated steam without a pressure transmitter?
Yes. For saturated steam, temperature gives density. But a multivariable meter is better because it checks pressure and avoids errors during boiler pressure swings.
What is the maximum temperature for a high-temp vortex flow meter?
Standard models often stop around 240°C. High temperature versions can handle 350°C or more. Check the exact process temperature and ask for the right sensor option.
What pipe sizes does a Prowirl style multivariable meter cover?
Common sizes are DN15 to DN300. For saturated steam, the most common sizes are DN25, DN40, DN50, DN80, and DN100.
How do I get a quote for a saturated steam vortex flow meter?
Send us your pressure in bar g, temperature in °C, pipe size in DN, and flow range in kg/h. We will return a sizing report and price in one business day.
Get a Specific Sizing Check
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will respond with a technical selection and a quote. Tel: +86-25-68650347. WhatsApp: +86-25-52155837. WeChat: +86 15365082610.
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