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Asphalt Flow Meter: High-Temperature Liquid Mass Flow Systems
For hot asphalt, bitumen, and heavy fuel oil, a Coriolis mass flow meter gives you kg/h or ton/h directly. Silver Instruments supplies high-temperature Coriolis meters that operate up to 350°C and handle viscosity up to 100,000 cP. This removes density compensation errors that volumetric meters suffer from.
Why Asphalt Needs Direct Mass Measurement
Asphalt temperature in a loading rack can swing from 140°C to 200°C. A change of 10°C shifts density by roughly 0.6%. If you use a turbine or positive displacement meter, you must compensate for that shift. Most engineers skip this part, but the billing error adds up fast. A Coriolis meter ignores density change because it grabs mass flow directly. We have seen a paint manufacturer in Southeast Asia cut custody transfer disputes by 80% after switching to mass flow on their bitumen line.
High viscosity is another factor. Polymer-modified asphalt can exceed 50,000 cP. Our CMF series uses a straight tube or slightly curved tube design with a smooth bore. It keeps pressure drop low and avoids clogging. Volumetric meters with moving parts jam or wear out quickly at these viscosities.
Hardware Built for 350°C Asphalt Service
Standard Coriolis meters tap out at 200°C. For asphalt, you need a high-temperature option. Silver Instruments CMF-HT meters use a robust 316L stainless steel sensor, PT100 temperature measurement, and a remote transmitter. The sensor can sit on a hot pipe with steam tracing, while the electronics box mounts 10 meters away in a cool cabinet. No internal elastomers, no seals that fail at sustained high temperature.
Process connections match your existing pipe: DN15, DN25, DN40, DN50, DN80, DN100 flanged, rated PN40 or PN100. For a typical truck loading bay, a DN50 meter handles 1 to 30 t/h at 190°C and 12 bar. The output is 4-20 mA HART, Modbus RTU, and a scalable pulse for totalizer. Certification includes ATEX Zone 1 and IECEx for gas and dust environments.
Installation Tips That Save You Downtime
Hot asphalt solidifies below 120°C. If you shut down without purging, the meter can become a block of solid bitumen. Here is the thing: you must plan for heat tracing and insulation. In practice, we recommend electric or steam jacket systems that keep the meter body above 150°C even during idle periods. Install the meter in a vertical pipe with downward flow so that gravity h
Zero the meter at operating temperature, not at ambient. A zero point calibration done cold will drift once the sensor heats up to 190°C. Our commissioning engineers walk through this with your team over a video call.
Why Engineers Choose Silver Instruments
As a manufacturer, we ship directly from our Nanjing production center to Australia, Southeast Asia, the Middle East, and Latin America. No regional middleman markup. We stock sensors and transmitters for quick delivery, usually within 2 weeks for standard high-temperature models. If you need a custom flow range, we tune the secondary electronics to your specific gravity and viscosity data.
Send us your pressure (bar), temperature (°C), pipe size (DN), and required flow range. We reply with a data sheet and a commercial quote within 24 hours. Reach us at [email protected], or call +86-25-68650347. You can also message via WhatsApp +86-25-52155837 or WeChat +86 15365082610. Ask for our asphalt meter reference list from the Middle East and Vietnam.
Frequently Asked Questions About Asphalt Flow Meters
Can a Coriolis meter handle asphalt with fillers like limestone powder? Yes, the smooth bore tube design passes particles with minimal risk of blockage. We recommend a flow straightener upstream if the solid content exceeds 5% by weight.
What pressure drop should I expect? For a DN50 meter at 15 t/h and 500 cP, pressure drop stays below 0.3 bar. High-viscosity modified binders may push it to 0.6 bar. The straight tube design helps keep it low.
Do I need steam tracing on the meter? Yes, unless you can guarantee a continuous hot flush with light cycle oil before every shutdown. Steam tracing is the safer route for bitumen applications.
Is the meter suitable for trade-approved custody transfer? Many of our customers use the CMF-HT for internal cost allocation and loading rack management. For legal metrology, we supply a model with an optional MID or OIML R117 pattern approval certificate on request.
How often does a high-temperature Coriolis meter need recalibration? We recommend a verification check every 12 months using water or oil at a similar Reynolds number. The sensor has no moving parts, so drift is minimal. You can perform a quick zero check with a closed shutoff valve.