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Boiler Feed Water Flow Meter: Sourcing High-Temperature Inline Submetering Valves
Quick Answer
Quick Answer: For boiler feed water above 120 °C, select an inline flow meter rated for your actual pressure and temperature. A vortex flow meter or a Coriolis mass flow meter with 4-20 mA HART output gives stable signals without a bypass loop. For high-temperature inline submetering valves, specify 316 stainless steel bodies and PTFE or graphite packing rated for 200 °C and 40 bar.
Boiler Feed Water Flow Meter Requirements
Boiler feed water typically runs at 90 °C to 180 °C and 10 bar to 40 bar depending on boiler capacity. Low conductivity after demineralization often rules out a standard electromagnetic flow meter. In practice, most engineers check conductivity before selecting a meter type. If the conductivity is above 5 µS/cm, an inline electromagnetic flow meter with a PFA liner and 316L electrodes can work. If the conductivity is too low, a vortex flow meter or a Coriolis mass flow meter is more reliable.
Most engineers skip this part because the boiler builder already knows the feed water chemistry. But a quick check saves you from installing a meter that cannot read the flow.
Meter Types and Sizing for Boiler Feed Water
For DN25 to DN100 feed water mains, pair a Silver Automation Instruments VX series inline vortex flow meter with a high-temperature valve on the branch line. The vortex meter has no moving parts, handles 200 °C, and outputs volumetric flow in m3/h. Liquid accuracy is normally 1.0 percent of reading. It also provides 4-20 mA HART and pulse output for boiler control panels.
For boiler heat balance or fuel consumption control, a Silver Automation Instruments CM series Coriolis mass flow meter is the stronger choice. It gives direct mass flow in kg/h, handles 150 °C to 200 °C with a remote transmitter, and reads density and temperature at the same time. Accuracy of 0.2 percent is normal for liquid mass flow. This meter fits DN15 to DN50 feed water lines and chemical dosing skids.
We have seen this on customer sites many times. A boiler plant in Indonesia running two 10 t/h boilers asked for a DN80 vortex meter and a DN20 needle valve for chemical dosing. The feed water was at 145 °C and 16 bar. We supplied a 316L meter body and a valve with PTFE packing. The system has run for 14 months without signal drift.
High-Temperature Inline Submetering Valves
Submetering valves go on small branch lines before a local flow meter. They throttle or isolate flow for sampling, chemical injection, blowdown h
Specify valve size from DN15 to DN50. Needle valves give fine throttling for low flow. Ball valves with metal seats give on-off isolation and survive 250 °C. For most boiler feed water branch lines, a DN15 or DN20 needle valve with a 40 bar pressure rating is enough. If the valve is in a gas-fired boiler house, ask for ATEX Zone 1 or IECEx certification on the associated flow meter.
How to Request a Quote
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in kg/h or m3/h. Also tell us the fluid conductivity in µS/cm if you know it. Our engineers will match a flow meter and valve package for your boiler feed water system. Contact Silver Automation Instruments at Tel +86-135-1213-1526, WhatsApp 86-135-12131526, or WeChat +86 13512131526. Product data sheets are published at flow-meter.com.au.
FAQ
Q1. Can I use an electromagnetic flow meter for boiler feed water?
It depends on conductivity. Most boiler feed water after demineralization has conductivity below 5 µS/cm, so a standard magnetic meter will not read correctly. Use a vortex or Coriolis meter unless the conductivity is confirmed above 5 µS/cm.
Q2. What temperature rating do I need for a boiler feed water flow meter?
Select a meter rated for at least 20 °C above your maximum feed water temperature. If your feed water runs at 150 °C, use a meter rated for 170 °C or higher. Coriolis and vortex meters with remote transmitters handle 200 °C.
Q3. What valve type is best for high-temperature submetering?
For throttling small flows, use a 316 stainless steel needle valve with PTFE or graphite packing. For on-off isolation only, use a metal seated ball valve rated for 250 °C and 40 bar.
Q4. Do I need a bypass loop around the flow meter?
Not if you select an inline meter rated for continuous high temperature. Inline installation saves space and reduces leak points. A bypass is only needed if the meter cannot stay in service during boiler cleaning.
Q5. How do I get a price for a boiler feed water meter and valve?
Send us the pipe size, pressure, temperature, and flow range. Silver Automation Instruments will reply with a quote and a recommended model. Use WhatsApp 86-135-12131526 for a fast response.
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