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Tar Oil Flow Meter Material Hardening for Abrasive Mediums
Quick Answer: Standard flow meter internals fail quickly in tar oil service. Silver Automation Instruments supplies oval gear flow meters with hardened materials like tungsten carbide and ceramic bearings. These meters handle high viscosity, abrasive solids, and temperatures up to 200 °C. Send us your pressure (bar), temperature (°C), pipe size (DN), and flow range. We will recommend the correct hardened material flow meter and provide a price.
Why Standard Flow Meters Fail in Tar Oil Service
Tar oil, coal tar, and heavy fuel oils often carry fine coke breeze, sand, or catalyst fines. These particles abrade the measuring chamber and bearings. A stainless steel oval gear meter can show gear wear within 3 months. The measured error drifts beyond 1 percent. Frequent recalibration and part replacement drive up costs and downtime. Engineers in Vietnam and Indonesia report this problem often. The right fix is a flow meter with hardened material internals.
Oval Gear Flow Meter with Hardened Materials
Silver Automation Instruments designs oval gear meters for abrasive tar oil. The meter housing is cast steel or stainless steel. The gears and bearings use tungsten carbide or silicon carbide ceramic. Tungsten carbide hardness exceeds 1500 HV. It resists sliding wear from solid particles. Ceramic bearings add high hardness and corrosion resistance. These material combinations last over 24 months in continuous tar oil service at 180 °C. We shipped DN25 and DN50 meters to a coal tar distillation plant in South Africa. The customer reported no accuracy drift after 18 months. Previously they replaced mechanical parts every 6 months.
Key Material Options and Application Limits
We offer several hardening options. Tungsten carbide (WC) gears with WC bearings handle the highest abrasion. Hard chrome plated gears are a lower cost option for mildly abrasive tar oil with fewer particles. Silicon carbide (SiC) bearings resist high temperature and thermal shock. The meter can operate from -20 °C to 200 °C. Pressure ratings reach PN40 (40 bar) depending on size. For tar oil above 150 °C we add a heat sink or spacer to protect the pulse output or 4-20 mA HART transmitter. Viscosity range covers 1 to 1000 cP, which suits most tar oil grades. Even at high viscosity the hardened oval gear meter keeps 0.5 percent accuracy. The hardened materials do not alter the measuring principle. They simply extend service life.
Installation Tips Without Guesswork
Install a strainer or filter upstream. A Y-type strainer with 0.5 mm mesh catches large particles that could damage even hardened gears. Pipe the meter with a bypass. This lets you clean the strainer without stopping the process. Fill the meter slowly during startup. Sudden velocity shocks the gears. If tar oil solidifies at ambient temperature, apply heat tracing to the meter and piping. The cast steel housing supports flange heaters. Monitor the meter pulse output regularly. A sudden shift in K-factor sign
Why Other Flow Meter Types Fall Short
Some users ask about electromagnetic flow meters. Tar oil is non-conductive. A magmeter will not generate a signal. Coriolis mass flow meters work but cost more and risk plugging with viscous tar. Turbine meters wear out fast from abrasive particles. Vortex meters suffer erosion and poor low-flow signals. Positive displacement oval gear meters with hardened internals give the right balance of cost, accuracy, and durability. They provide direct volumetric reading, easy to convert to mass using reference density. We replaced failed Coriolis meters in India with our hardened oval gear meter for tar oil blending. Total cost dropped 70 percent and accuracy stayed within 0.5 percent.
Real World Query: Mexico Tar Oil Terminal
Last year a terminal in Mexico needed a flow meter for loading tar oil into tank trucks. Tar oil temperature was 130 °C. Pressure stayed at 8 bar. Pipe size was DN50 and flow range 200 to 2000 L/h. They required ATEX Zone 1 approval for flammable atmosphere. We supplied an oval gear meter with tungsten carbide gears, ceramic bearings, and an EX d certified 4-20 mA HART transmitter. The system has been running for 14 months. The customer checks the pulse output against a master meter every quarter. Error is still below 0.3 percent. The only maintenance involves cleaning the strainer every month.
FAQ on Tar Oil Flow Meter Material Hardening
What flow meter is best for tar oil with abrasive solids? A positive displacement oval gear meter with tungsten carbide bearings and gears. Silver Automation Instruments supplies meters from DN15 to DN100 with ATEX and high temperature options.
How long do hardened gears last in tar oil? Service life typically reaches 18 to 36 months before any accuracy shift. Standard gears often fail in 3 to 6 months under the same abrasive load.
Can I use an oval gear meter for cold tar oil? Yes, but preheating might be needed. If the tar oil solidifies below 50 °C, use heat tracing and insulate the meter. Hardened materials handle dense, cold tar oil without issue.
Do you provide price and delivery fast? Send us your flow rate, pipe size, temperature, pressure, and viscosity. We will send a quotation with the recommended hardened material flow meter within 24 hours.
What certifications does the tar oil flow meter carry? We offer ATEX, IECEx, and EAC explosion proof certifications for Zone 1 or Zone 2. The meter also comes with a 4-20 mA HART output for DCS and PLC integration.
To receive a concrete offer, describe your tar oil process. Tell us pressure (bar), temperature (°C), pipe size (DN), and the flow range in L/h or kg/h. Mention if you need an explosion proof transmitter. Ask for a quote for the hardened material oval gear flow meter through our website or email. We will reply with a specific selection and price.