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Calibrating Digital Turbine Meters for Clean Hydrocarbons: Flomec G2 Manual Field Guide
Quick Answer: A Flomec G2 digital turbine meter in clean hydrocarbon service should be calibrated against a certified master meter or pipe prover before custody transfer or batch loading. The K-factor must match the actual fluid viscosity and temperature. Silver Instruments supplies turbine, Coriolis, and oval gear flow meters for diesel, jet fuel, naphtha, gasoline, and light oil applications.
Why Clean Hydrocarbon Calibration Changes by Fluid
Turbine meters measure flow velocity. The output frequency per volume changes with viscosity, density, and bearing drag. Diesel at 3 cP does not calibrate the same as naphtha at 0.6 cP. The Flomec G2 manual makes this point early. Many engineers skip viscosity correction. That leads to batch errors from 0.5 to 1.5 percent. We saw this at a fuel loading rack in Indonesia. The meter factor was set for gasoline but the line handled light condensate. The batch total drifted 1.2 percent before the operator caught it.
Manual Calibration Steps from the Flomec G2 Manual
First clean the line and strainer. Then run the meter at 50 percent of maximum flow for 15 minutes to remove air. Go to the calibration menu on the G2 display. Set the pulse output to raw frequency if the firmware allows it. Record flow from a master meter or pipe prover for at least 60 seconds. Compare the indicated volume against the reference volume. Adjust the K-factor using the manual calibration function. Repeat this at three flow rates. For clean hydrocarbons three points are enough. Here is the thing. Bearing slip shows up at low flow and it changes the meter factor. Most field technicians skip that point and then wonder why small batches drift.
K-Factor, Meter Factor, and Pulse Output
The Flomec G2 stores a K-factor in pulses per litre or pulses per gallon. Some firmware versions call it a scale factor. Calibration is a linear correction across a set of flow points. In diesel loading a typical K-factor for a DN40 turbine is around 432 pulses per litre at 2 to 10 m³/h. This value changes with bearing wear. We tell customers to check the K-factor every 12 months for clean fuel. In high cycle loading racks check every 6 months. If your G2 model accepts a PT100 input, use it for temperature compensation on light hydrocarbon blends. The pulse output should be wired to a batch controller or PLC with a shielded cable. For longer cable runs use a 4-20 mA HART output or Modbus if accuracy is more important than raw pulse speed.
Where Clean Hydrocarbon Turbine Meters Fail
Clean does not mean lubricating. Low viscosity fluids like naphtha and gasoline provide less bearing lubrication. That affects repeatability at low flow. Entrained air from pump suction will make the turbine overspeed. The G2 display may show an instant flow spike. Install an air eliminator upstream. Use a strainer with 100 mesh for DN25 and smaller lines. For dirty or viscous oil a turbine meter is not the right choice. Consider an oval gear flow meter from Silver Instruments. Positive displacement meters do not depend on fluid velocity. We have su
Model Pairing and Practical Specs
For a Flomec G2 replacement or a new clean hydrocarbon skid send us these details. Pipe size DN15 to DN100. Flow range in litres per minute or m³/h. Fluid name and viscosity in cP. Operating pressure in bar and temperature in °C. Output required such as pulse, 4-20 mA HART, or Modbus. Hazardous area classification such as ATEX Zone 1 or IECEx. Silver Instruments offers turbine flow meters with 316 stainless steel body, tungsten carbide bearings, and a local display. For custody transfer of diesel or jet A1 a Coriolis mass flow meter is often better. It measures mass directly in kg/h and needs no K-factor correction for density changes. For high viscosity oils use an oval gear meter. For water and wastewater use an electromagnetic flow meter.
Calibration Frequency and Field Checks
Verify manual calibration with a master meter. In a clean hydrocarbon terminal check calibration every 6 to 12 months. Do a field check every month using the display total against a tank level or weighbridge. If the deviation exceeds 0.5 percent investigate air, bearing wear, or a shifted K-factor. A paint manufacturer in Vietnam found a 0.8 percent shift on a solvent line. The cause was a partially blocked strainer. Cleaning the strainer restored the original calibration. That saved a full meter recalibration.
FAQ: Flomec G2 Calibration and Replacement
How often should I calibrate a Flomec G2 turbine meter for diesel?
Check the K-factor every 12 months in clean diesel service. In loading rack duty with high cycles check every 6 months. A monthly total check against a weighbridge or tank level is good practice.
What is more important for clean hydrocarbons, viscosity or density?
Viscosity has a larger effect on turbine meter slip and low flow repeatability. Density changes are smaller for most clean hydrocarbon blends. A Coriolis meter removes both effects because it measures mass directly.
Can I use a Flomec G2 for jet A1 custody transfer?
Yes. The meter must be calibrated for jet A1 at operating temperature and flow range. Use a master meter or prover. Check local weights and measures rules before custody transfer.
What flow range should I calibrate at?
Use at least three points. Pick 10 percent, 50 percent, and 90 percent of the normal operating range. Keep the low point inside the turbine linear range. If the low point error is high, reduce the minimum batch size.
Can Silver Instruments supply a replacement turbine meter for a Flomec G2?
Yes. Send us the pipe size, fluid, viscosity, flow range, pressure, temperature, and output type. We can match a turbine meter or recommend a better technology for your clean hydrocarbon process.
For a quick quote send your flow rate, pressure (bar), temperature (°C), pipe size (DN), and fluid viscosity (cP). Contact Silver Automation Instruments at Tel: +86-25-68650347, WhatsApp: +86-25-52155837, or WeChat: +86 15365082610.
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