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Exact Flow has introduced a dual-rotor turbine flow meter for subsea hydraulic pod valve actuation and topside flow applications in the offshore oil industry.

In hydraulic fluid applications, it is packaged in a high-pressure, manifold-mounted system with built-in redundancy.

The Exact dual-rotor subsea turbine flow meter has a design that enhances universal viscosity curves (UVCs) and extends the usable flow measurement range.

The meter also offers bearing diagnostics, improved accuracy, pressure compensation, long-life ceramic bearings and high-shock internals.

Subjected to low pressures, hydraulic fluids are often estimated to be incompressible.

However, when subjected to high pressures, hydraulic fluid properties vary greatly and have a substantial effect on turbine flow meter accuracy.

The Exact dual-rotor subsea flow meter is calibrated to account for the entire range of temperature and pressure conditions.

It includes internal temperature and pressure sensors to correct for these effects and provide best possible accuracy.

With the Exact dual-rotor subsea flow meter, bearing diagnostics can be determined by monitoring the ratio of the rotors to detect wear or cleanliness.

Improved accuracy is a result of the clamped internal mounting design eliminating movement in the support system.

Pressure compensation contributes to the accuracy of the flow rate, as pressure does affect the viscosity of the fluid.

The ceramic bearings are robust and more forgiving to particulates when compared to 440C stainless steel.

Helical rotors optimise energy transfer over the entire surface of the blade, enhancing speed of response to step changes in flow rate.

Helical rotors also produce less pressure drop across the flow meter compared to traditional flat-bladed rotor designs.

This reduction, translated into force, reduces bearing wear, which allows the meter to maintain its original calibration over a longer period of time.

Exact Flow also offers an embedded pickoff system that is impervious to vibration and minimises space, allowing for direct coupling of electronics.

Both water-tight embedded and remote electronics are available to process the signal output, including the Exactcomp IFC15 flow computer.

Exact Flow dual-rotor turbine flow meters have a repeatable flow range of up to 500:1 and a UVC turndown range of 60:1, in contrast to 100:1 and 10:1, respectively, for many single-rotor turbine meters.

This allows the user to deploy fewer flow meters to cover a wide range of flow.

All Exact Flow turbine flow meters are calibrated at Flow Dynamics, in a NVLAP accredited facility, obtaining uncertainties of +/-0.05 per cent of rate and +/-0.012 per cent repeatability.

Calibrations are offered in 1.2cSt solvent, blended oils and water with 10, 20 or 30 calibration data points.

UVCs are developed over the min/max temperature range of the process fluid.

Exact Flow

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