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Oil Flow Meter for 10000 cSt: Ultimate Engineering for Extreme Asphalt Compounds
Quick Answer: To measure flow of asphalt binders, bitumen, or heavy fuel oils with viscosity up to 10000 cSt, you need a positive displacement flow meter with a heated jacket. Oval gear flow meters with hardened rotors and steam or electric tracing deliver reliable accuracy even at 180 °C. Silver Automation Instruments supplies these meters with 4-20 mA HART output and ATEX certification for the most demanding asphalt plants.
Why Standard Flow Meters Fail at 10000 cSt
In a typical refinery or asphalt terminal, operators first try a turbine or vortex meter. But at 10000 cSt, the Reynolds number drops so low that the velocity profile becomes flat and flow conditioning does not help. Vortex meters stop generating vortices below a minimum Reynolds number. Turbine meters see sticky deposits on the bearings. Electromagnetic flow meters cannot work because bitumen is non-conductive. Ultrasonic meters lose signal when the fluid contains bubbles or when viscosity damps the acoustic path. The result is a meter that reads zero or drifts badly.
We have seen this on customer sites many times. Last year a hot mix plant in Vietnam replaced an ultrasonic meter that was failing at 7000 cSt. The operator could not get repeatable batch totals. After installing an oval gear meter from Silver Instruments with a steam jacket, the batch accuracy went to 0.5%.
What Makes a Flow Meter Suitable for Asphalt at 10000 cSt
Positive displacement meters physically capture and rotate with the fluid. Oval gear meters, helical gear meters, and some rotary piston designs work well. The two oval gears rotate in a measuring chamber. Each rotation sweeps a fixed volume. The transmitter counts pulses and calculates the flow. This principle does not depend on the velocity profile. So viscosity changes or low flow rates do not break the measurement.
For asphalt compounds, the meter body needs a heating jacket. Asphalt solidifies below 120 °C. If the meter cools down during a shutdown, the gears will lock. Steam tracing or electric heating tape keeps the chamber above 150 °C. Our standard jackets run on saturated steam at 4 bar or with PT100-controlled electric heaters. We also supply high-temperature Hall-effect sensors rated up to 200 °C.
The gears themselves must be hardened. We use 316L stainless steel or Hastelloy C gears with a nitride coating for abrasive fillers in modified bitumen. For paving-grade asphalt with no aggressive fillers, hard chrome-plated carbon steel gears offer a good cost-performance balance.
Silver Instruments Oval Gear Flow Meter for Extreme Asphalt Service
We manufacture a dedicated model for high-viscosity hydrocarbons. The meter covers pipe sizes from DN15 to DN100. The flow range spans 2 L/h miniature meters up to 100 m³/h on the larger DN80 and DN100 models. The standard pressure rating is PN16, but we offer PN40 and even PN63 with a custom flange drilling for high-pressure asphalt injection systems.
Output options include a dual-channel pulse output for batching and a 4-20 mA HART transmitter with an integral LCD display. Many asphalt plants in Southeast Asia and the Middle East request a local totalizer so the operator does not need to walk to the control room. The transmitter also sends the signal to the PLC for remote totalizing and batching control.
ATEX Zone 1 or Zone 2 certification can be provided. The terminal boxes are Ex d rated. We ship these meters to countries like Indonesia, Saudi Arabia, and Nigeria where explosive atmospheres are common around asphalt tanks.
Heating Jacket Options and Installation Tips
Most asphalt flow meters from Silver Instruments ship with half inch or three-quarter inch NPT threaded connections for steam or hot oil tracing. The jacket covers the full meter body includ
On site, the installer must mount the meter with the gears in the horizontal plane to avoid uneven wear. We always recommend an upstream strainer or Y-type filter. Some asphalt grades carry coke particles or sand. If these particles enter the measuring chamber, they can scratch the gears and degrade accuracy. A 40-mesh screen catches most debris. The pressure drop through the filter is less than 0.2 bar when clean.
During a restart after a long shutdown, circulate hot oil through the jacket for at least 30 minutes before allowing asphalt into the meter. Once the body temperature reaches 140 °C and holds steady, open the inlet valve slowly. This prevents thermal shock and gear damage.
Real Performance Data from a Customer in Thailand
A polymer-modified bitumen supplier in Thailand operates a blending line at 190 °C. Their viscosity peaks at 9500 cSt. They used a Coriolis meter before, but the meter plugging from filler particles caused frequent shutdowns. The Coriolis tubes accumulated a layer of sticky polymer that shifted the calibration. After switching to an oval gear meter with Hastelloy gears and electric tracing, they run six months without cleaning. The totalized volume matches the truck loading scale within 0.3%. This data comes from their maintenance log shared with our support team in May 2024.
Now they order two additional meters for a new SBS-modified bitumen line. The engineer simply sent us the pipe size (DN40), operating temperature (185 °C), and flow range (2 to 20 L/min). We confirmed the meter model and delivered within three weeks.
How to Order a 10000 cSt Asphalt Flow Meter
Send us your key parameters. We need the fluid type, viscosity at operating temperature, flow range, pipe size (DN), pressure, temperature, and the heating medium you have (steam or electricity). Also tell us if you need ATEX certification or a local display. Our engineers will select the right gear material, bearing type, and jacket design.
Contact Silver Automation Instruments for a quotation. Email: [email protected]. Tel: +86-135-1213-1526. Whatsapp: 86-135-12131526. WeChat: +86 13512131526. We respond to rfq emails within 12 hours.
Frequently Asked Questions
Can I measure asphalt flow with a Coriolis meter at 10000 cSt? Coriolis meters can measure high-viscosity fluids, but the pressure drop becomes high. For asphalt with fillers, the tubes can plug. Silver Instruments recommends a heated oval gear meter for better long-term reliability.
What is the minimum flow rate you can detect? For our DN15 meter, the minimum flow is about 0.3 L/h at 10000 cSt. For larger DN50, the min flow is around 120 L/h. The meter has a 10:1 turndown ratio on high-viscosity service.
How do you prevent solidification during a plant shutdown? The heating jacket keeps the meter body warm using steam or electric tracing. If power is lost, you must drain the meter or flush with light oil before the temperature drops below 120 °C.
Do you offer meters with pulse output only? Yes, a simple dual-channel pulse module is available for batching systems. We also supply the 4-20 mA HART version with a totalizer. Most customers take the HART version because it simplifies wiring.
What countries do you ship to? We ship to Southeast Asia, Oceania, Latin America, Africa, and the Middle East. Regular destinations include Vietnam, Indonesia, Thailand, Malaysia, the Philippines, India, Saudi Arabia, UAE, Nigeria, and Chile. We provide door-to-door express shipping for urgent requirements.
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