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Endress Hauser Turbine Flow Meter Principles: Volumetric Sizing for Low-Viscosity Hydrocarbons
Quick Answer: A turbine flow meter measures low-viscosity hydrocarbons by counting rotor pulses. The pulse frequency is proportional to volumetric flow rate. For gasoline, diesel, naphtha, and jet fuel from 0.5 to 5 cP, sizing depends on DN, flow range, K-factor, and back pressure. Silver Instruments supplies DN15 to DN200 turbine flow meters with 4-20 mA HART output for these applications.
Send us your pressure in bar, temperature in °C, pipe size in DN, and flow range in m3/h. We will return a model, price, and delivery time from Nanjing.
Most engineers skip the theory and go straight to the K-factor. Here is the thing. The K-factor has to match your flow range. A meter sized for 2 m3/h will not stay linear at 80 m3/h. We see this on customer sites many times.
Turbine Flow Meter Principle for Low-Viscosity Hydrocarbons
Hydrocarbon liquid enters the meter body and strikes the rotor blades. The rotor spins at a speed proportional to fluid velocity. A magnetic pickup outside the flow path counts each blade pass. The signal is a square wave pulse train. Each pulse represents a small volume. The K-factor is the number of pulses per liter or per gallon.
For low-viscosity hydrocarbons the rotor can spin freely. Viscosity below 5 cP creates less drag. The meter output stays linear over a wide range. Gasoline at 0.6 cP behaves well. Diesel at 3 cP also works. Naphtha and light fuel oil fall in the same range.
Volumetric Sizing Steps That Work
Start with pipe size. Do not size a turbine meter by line size only. You need actual minimum and maximum flow rates. A DN50 meter may read 8 to 50 m3/h. If your minimum flow is 1 m3/h, DN50 is too large. Use DN25 or DN32.
Next check viscosity. Turbine meters lose range when viscosity exceeds 5 cP. Low-viscosity hydrocarbons usually pass this check. Heavy crude or lubricating oil does not.
Then check pressure drop and back pressure. Low pressure at the meter outlet can cause cavitation. Cavitation damages the rotor and ruins accuracy. Calculate the minimum back pressure. For hydrocarbons the rule is two times the meter pressure drop plus 1.25 times the vapor pressure.
Pick the K-factor. A DN40 turbine meter may have a K-factor around 3200 pulses per liter. A DN80 meter may have 180 pulses per liter. Match the pulse output to your flow computer or PLC input. The flow rate in m3/h equals frequency divided by K-factor with the right time base.
Where Endress Hauser Principles Match Silver Instruments Hardware
Endress Hauser has good published principles for turbine flow meters. The physics do not change from one supplier to another. The difference is supply chain and support. A refinery in Malaysia or a fuel blending terminal in Chile often needs fast delivery. Silver Instruments keeps DN15 to DN1
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A customer in Vietnam asked us last month for a DN80 turbine flow meter for diesel loading. They needed 4-20 mA HART and a local totalizer. We shipped in 8 days with a 5-point calibration certificate. That is the kind of detail that matters more than a brand name.
Typical Model and Parameter Pairs
For diesel loading skids use a Silver Instruments SI-TUF-40 turbine flow meter. Size DN40. Flow range 2 to 20 m3/h. Specify 4-20 mA HART plus pulse output. Meter body in 316L stainless steel. Bearings in tungsten carbide for long life.
For gasoline terminal transfer use SI-TUF-80. Size DN80. Flow range 20 to 120 m3/h. Add a PT100 sensor and a flow computer. Accuracy is plus or minus 0.5 percent of reading over the linear range. If you need mass flow, convert using density. For gasoline density at 0.72 kg/L, 20 m3/h is about 14400 kg/h.
For jet fuel depots in Africa use SI-TUF-50. Size DN50. Flow range 8 to 50 m3/h. Use EX d or EX ia approval for ATEX Zone 1. Silver Instruments can supply flameproof or intrinsically safe versions.
Contact Silver Automation Instruments for a quote. Tell us your fluid, viscosity in cP, temperature in °C, pressure in bar, pipe size in DN, and flow range in m3/h. We will reply with a model, price, and delivery time.
Tel: +86-25-68650347
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FAQ
What viscosity is low-viscosity for a turbine flow meter?
Hydrocarbons from 0.5 to 5 cP are low-viscosity. Gasoline, diesel, naphtha, kerosene, and light fuel oil fall in this range. Above 5 cP the linear range shrinks and you may need a positive displacement meter.
Can one turbine flow meter measure both gasoline and diesel?
Yes, but you must size for the lower viscosity and the wider flow range. Meter factor shift is small between 0.6 cP and 3 cP if the flow stays inside the linear range.
What is the minimum back pressure for a turbine flow meter on hydrocarbons?
Use two times the meter pressure drop plus 1.25 times the vapor pressure. This prevents cavitation and rotor damage. For gasoline this often means at least 1.5 to 2 bar back pressure at the meter outlet.
Do I need a calibration certificate for a diesel loading meter?
Most terminals and auditors ask for a 5-point calibration certificate. Silver Instruments provides a certificate from our calibration rig with water or diesel as the test fluid.
How fast can Silver Instruments deliver a DN50 turbine flow meter to Southeast Asia?
Standard DN15 to DN100 turbine flow meters often ship in 7 to 10 days from Nanjing. Custom flanges or EX approvals may add 2 to 3 weeks. Send your pipe size and flow range to check stock.
Visit flow-meter.com.au for more flow meter options from Silver Automation Instruments.
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