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Condensate Flow Meter: Sourcing High-Temperature Saturated Steam Return Sizers
Quick Answer: For high temperature saturated steam return condensate, use an inline vortex flow meter rated for at least 180 °C or a Coriolis mass flow meter rated for 200 °C. Send pipe size in DN, pressure in bar, temperature in °C, and flow range in kg/h to Silver Automation Instruments for a specific model and quote.
Condensate return lines move hot liquid water after steam releases heat in a process. These lines often run at 150 °C to 180 °C. Pressure at the trap outlet can range from 5 bar to 15 bar. If back pressure drops too low, some water flashes into steam. A flow meter that only works for cold water will not survive or will not read correctly in this service.
Silver Automation Instruments is a flow meter manufacturer and supplier for industrial process plants. We ship to customers in Southeast Asia, Oceania, Latin America, Africa, and the Middle East.
Vortex Flow Meter for Condensate Return
A vortex flow meter is the first choice for many saturated condensate lines. It has no moving parts. It handles continuous liquid temperatures up to 250 °C on standard models and up to 350 °C on high temperature versions. We often supply DN25 to DN200 vortex meters for condensate return headers in palm oil mills, chemical plants, and beverage factories across Southeast Asia.
For liquid condensate flow, use a 316L stainless steel body. Standard output is 4-20 mA HART with optional RS485 Modbus. ATEX Zone 1 approval is available for hazardous areas. If you need heat metering, add an integrated temperature sensor. In practice, most engineers skip the two phase risk check at first. They size the meter for liquid only. Then flash steam appears at low load and the output fluctuates.
Coriolis Mass Flow Meter for Saturated Condensate
If the condensate has variable density or carries small amounts of flash steam, a Coriolis mass flow meter gives direct mass flow in kg/h. It does not need density compensation. It also measures temperature and can detect two phase flow. Silver Instruments supplies high temperature Coriolis meters with sensor ratings up to 200 °C and special versions up to 350 °C.
We have seen this on customer sites many times. A cosmetic plant in Vietnam wanted to measure condensate from a 10 bar steam jacket. The line ran at 170 °C. They installed a DN15 Coriolis meter. It gave stable mass flow readings where a turbine meter failed due to flash steam.
Sizing Rules for High Temperature Condensate
Because condensate can flash at low pressure, the meter location matters. A meter installed right after a steam trap often sees a mix of water and flash steam. That mix causes unstable readings on many liquid flow meters. For water at 170 °C, the vapor pressure is about 7.9 bar absolute. The meter body pressure must stay above that level to keep the liquid phase stable.
Size the meter at the normal flow range. For a vortex meter, keep the normal flow between 30 percent and 70 percent of the upper range value. For a Coriolis meter, a lower flow ra
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Key Sizing Data We Need
We need five items for a firm price and model selection. Send pipe size in DN. Send normal and maximum flow in kg/h or m³/h. Send operating pressure in bar. Send operating temperature in °C. Send the condensate source, for example steam trap discharge or pump return. If the line has a control valve, tell us the downstream pressure.
Do not send only the line size. A DN50 pipe can carry 500 kg/h in one plant and 5 000 kg/h in another plant. The flow range controls the meter bore and the accuracy.
What to Avoid in Condensate Metering
Avoid using an electromagnetic flow meter on pure steam condensate. Condensate from a boiler can have conductivity below 20 µS/cm. Electromagnetic flow meters need a stable conductive liquid. If the water is too clean, the output may drop out. We have seen this in a dairy steam return line in Australia. The customer replaced the magmeter with a vortex meter and the problem stopped.
Avoid installing the meter at the lowest point without a check valve. Slugs of water can hit the meter after steam traps open. Install a strainer upstream if the return line carries rust or scale. Avoid using plastic-bodied meters on lines above 120 °C.
FAQ: Condensate Flow Meter Selection
Can a vortex flow meter handle saturated steam condensate?
Yes. Use a vortex meter with a temperature rating of at least 180 °C and a 316L stainless steel body. Confirm that back pressure keeps the condensate in liquid phase at the meter.
What is the best flow meter for high temperature condensate return?
For most sites, an inline vortex flow meter offers the best balance of cost, accuracy, and reliability. For direct mass flow or lines with flash steam, a Coriolis mass flow meter is the stronger choice.
Do I need a steam flow meter or a water flow meter for condensate?
Condensate is liquid water. A water flow meter with a high temperature rating is correct. But if the line has two phase flow because of flash steam, the meter must be able to handle that condition or be installed upstream where pressure is higher.
What data do you need for a condensate flow meter quote?
Send pipe size in DN, normal and maximum flow in kg/h or m³/h, pressure in bar, temperature in °C, and the condensate source. We will reply with a model, accuracy statement, and price in one business day.
Can Silver Instruments supply ATEX approved meters for chemical plant condensate?
Yes. We supply vortex and Coriolis meters with ATEX Zone 1 and Zone 2 approvals. Tell us the gas group, temperature class, and zone when you send the inquiry.
Get a Quote for a Condensate Flow Meter
Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. Our engineers will select a high temperature vortex meter or Coriolis mass flow meter for your saturated steam return line.
Silver Automation Instruments
Tel: +86-135-1213-1526
Whatsapp: 86-135-12131526
WeChat: +86 13512131526
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