Flow Management Devices is the Technological Leader in the design, engineering, and manufacturing of Small Volume Provers. Starting in 2007 with the goal of “Continuously Improving Liquid Measurement Technology,” Flow MD’s patented prover design provides an accurate and fast measurement with minimal product displacement. Designed to be easy to operate, with self-diagnostics and long-wearing seals made of proprietary PTFE blends.
A Prover is a device with a "known traceable volume" designed to calibrate or prove a liquid flow meter's accuracy and repeatability under actual operating conditions. Provers can be stationary or portable devices used to calibrate and verify the accuracy and repeatability of both volumetric and mass flow meters. Provers are commonly used in the hydrocarbon industry for custody transfer or fiscal applications, where accuracy is critical
Our unique and compact prover design utilizes pulse interpolation electronics, a patented drive end, a motor-driven piston with durable carbon fiber belts, a smooth bore cylinder, a poppet valve, and optical position sensors. The Flow MD line of Small Volume Unidirectional Captive Displacement Provers incorporates Double Chronometry as recognized by API 4.6 and is compliant with API 4.2 Direct Master Meter Proving.
With the recent release of the 4th Generation proving technology, FMD provides a comprehensive line of Unidirectional Captive Displacement Provers or Small Volume Provers that include twelve sizes with flow ranges from 100 GPM to 24,500 GPM (142 BPH to 35,000 BPH) and a 1200:1 turndown ratio.
Why is It Important to Prove a Flowmeter?
Simply stated, to provide an accurate measurement.
In addition, proving is critical for financial transactions and custody transfer applications to maintain profitability and reduce financial uncertainties.
Flow meters are generally calibrated in a factory using clean and consistent factory conditions; once they reach the field, they are subject to various conditions. Over time these product and process variations can lead to accuracy shifts known as drifting.
FMDs Small Volume or Unidirectional Captive Displacement Provers use the known volume of the prover compared to the output of the flowmeter to calculate a correction factor allowing the user to adjust the flowmeter accordingly for a truly accurate representation of flow rates.
- High-Pressure NGL's
- Vanous Process Fluids
- Refined Products
- Crude Oil
FMD Provers can be used to calibrate/verify the accuracy and repeatability of the following meter types:
- Coriolis Mass
- PD (Positive Displacement)
The FMD-035 comes with 6” and the FMD-A35 comes with 8" standard ANSI B16.5 flanges on both the inlet and outlet, with a flow range capability of up to 3,500 GPM (5,000 BPH, 790 M3/HR).