Turbine Flowmeter Technology

Turbine flow meters measure the velocity of liquids, gases and vapors in pipes, such as hydrocarbons, chemicals, water, cryogenic liquids, air, and industrial gases.

Learn about Turbine Flowmeter Technology

Flomec TM series Battery Operated Flow Meters for Water are accurate, economical and designed to last.  Choose TM Water Meters for water processing and irrigation applications.

  • Meets Schedule 80 PVC specifications
  • Standard low-profile display
  • Seven sizes with three fitting types available
  • Flow rates from 1 to 600 gallons per minute (3.8 to 2271 L/min)

Features / Benefits

  • Easy to install
  • Displays in gallons, litres and cubic feet
  • Indicates Batch, Cumulative Totals and Rate of Flow
  • Available in Spigot, NPT, BSP (i in, 1 1/2 in and 2 in only), 150# ANSI Flange(3in and 4 in only) and DIN Flange(3 in and 4 in only) fittings
  • Non-volatile totals means amounts are retained when batteries are replaced or power is lost
  • Alkaline battery life: 2 years
Price: Starting at $66.00
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FLOMEC® G2 Series Battery Operated Precision Turbine Meters are available in a variety of housing materials. Rugged and dependable, the G2 Series offers:

  • Stainless Steel for most water, chemical, and fuel products
  • Aluminum for petroleum based products
  • PVDF for aggressive chemicals

Features / Benefits

  • Meter is designed for thin fluids < 100 cp
  • Modular design allows for use with Output Modules, Sensors and Remote Transmitters
  • 2 Totals (Batch = Resettable, Cumulative = Non-resettable); Rate of Flow, Factory calibrated in gallons or litres. Field calibratable. Includes non-volatile totals.
  • High accuracy meter
  • Internal parts are simple to replace for easy maintenance
  • AAA Alkaline battery life: 2 years
Price: Starting at $368.00
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The TM Series Liquid Turbine ow meter is a highly- versatile product line that offers all stainless steel, precision- machined components with CD4MCu steel rotors. Available for flow ranges from 3/8” to 10”

Price: Starting at $321.00
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Specifically engineered to meet the strict standards required for custody transfer, the High Accuracy Meter delivers +/- 0.5% or better accuracy and +/- 0.1% repeatability for low viscosity applications.

Price: Starting at $946.00
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The TMC Series cryogenic turbine flow meter has an all stainless steel body and shaft, with a nickel rotor in all available line sizes.  These meters can handle a temperature range of -450° F to +450° F, making them ideal for extreme temperature applications.

Price: Starting at $946.00
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The FML250 Flow Monitor is a microcontroller based rate / totalizer designed for Liquid Applications. The unit has optional temperature compensation which makes adjustments to the flow calculations as needed with temperature fluctuations. Inputs include pulse and square wave flowmeter inputs.

Price: Starting at $399.00
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Repair Kit for Turbine meter. contains:

  • 2-Rotor Supports
  • 1-Rotor
  • 2 Retaining rings
Price: Starting at $189.00
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Learn more about this technology, the manufacturers, the users and the applications here.

How Turbine Flowmeters Work

Turbine flowmeters use the mechanical energy of the fluid to rotate a “pinwheel” (rotor) in the flow stream. Blades on the rotor are angled to transform energy from the flow stream into rotational energy. The rotor shaft spins on bearings. When the fluid moves faster, the rotor spins proportionally faster. Turbine flowmeters now constitute 7% of the world market.

Shaft rotation can be sensed mechanically or by detecting the movement of the blades. Blade movement is often detected magnetically, with each blade or embedded piece of metal generating a pulse. Turbine flowmeter sensors are typically located external to the flowing stream to avoid material of construction constraints that would result if wetted sensors were used. When the fluid moves faster, more pulses are generated. The transmitter processes the pulse signal to determine the flow of the fluid. Transmitters and sensing systems are available to sense flow in both the forward and reverse flow directions.

Plusses and Minuses

The cost is moderate. Very good at clean, low viscosity fluids of moderate velocity and a steady rate. Turndown is very good as it can read very low compared to the maximum flow. They are reliable if put in a clean fluid especially if it has some lubricity. AGA and API approved for custody transfers. They do cause some pressure drop where that may be a factor such as gravity flows. Not reliable for steam. Bearings wear out.

How to Use Turbine Flowmeters

Turbine flowmeters measure the velocity of liquids, gases and vapors in pipes, such as hydrocarbons, chemicals, water, cryogenic liquids, air, and industrial gases. High accuracy turbine flowmeters are available for custody transfer of hydrocarbons and natural gas. These flowmeters often incorporate the functionality of a flow computer to correct for pressure, temperature and fluid properties in order to achieve the desired accuracy for the application.

Be careful using turbine flowmeters on fluids that are non-lubricating because the flowmeter can become inaccurate and fail if its bearings prematurely wear. Some turbine flowmeters have grease fittings for use with non-lubricating fluids. In addition, turbine flowmeters that are designed for a specific purpose, such as for natural gas service, can often operate over a limited range of temperature (such as up to 60ºC) whereby operation at higher temperatures can damage the flowmeter.

This flowmeter can be applied to sanitary, relatively clean, and corrosive liquids in sizes up to approximately 24 inches. Smaller turbine flowmeters can be installed directly in the piping, but the size and weight of larger turbine flowmeters may require the installation of substantial concrete foundations and supports. The flow of corrosive liquids can be measured with proper attention to the materials of construction of all wetted parts, such as the body, rotor, bearings, and fittings.

Applications for turbine flowmeters are found in the water, petroleum, and chemical industries. Water applications include distribution systems within and between water districts. Petroleum applications include the custody transfer of hydrocarbons. Miscellaneous applications are found in the food and beverage, and chemical industries.

Industries Where Used

In order of magnitude from largest to smallest, these are used in oil and gas, water and wastewater, gas utility, chemical, power, food and beverage, aerospace, pharmaceutical, metals and mining, and pulp and paper.

Application Cautions for Turbine Flowmeters

Turbine flowmeters are less accurate at low flow rates due to rotor/bearing drag that slows the rotor. Make sure to operate these flowmeters above approximately 5 percent of maximum flow. Turbine flowmeters should not be operated at high velocity because premature bearing wear and/or damage can occur. Be careful when measuring fluids that are non-lubricating because bearing wear can cause the flowmeter become inaccurate and fail. In some applications, bearing replacement may need to be performed routinely and increase maintenance costs. Application in dirty fluids should generally be avoided so as to reduce the possibility of flowmeter wear and bearing damage. In summary, turbine flowmeters have moving parts that are subject to degradation with time and use.

Abrupt transitions from gas flow to liquid flow should be avoided because they can mechanically stress the flowmeter, degrade accuracy, and/or damage the flowmeter. These conditions generally occur when filling the pipe and under slug flow conditions. Two-phase flow conditions can also cause turbine flowmeters to measure inaccurately.