Provers ensure a custody transfer system is providing the most accurate measurement possible by offering a stationary or mobile means to facilitate calibration of flow meters before, during roll cage design book after a transfer. A prover is an automated system that provides on-site calibration to ensure flow meters in service for fiscal and custody transfer applications maintain sustainable measurement performance as well as remain in compliance with industry standards.
Since operating field conditions can significantly change from the time the flow meter was originally calibrated, proving ensures optimal meter performance over the life of the meter. Liquid provers are most often used with flow meters measuring light hydrocarbons to higher viscosity products at varying flow conditions. The prover is placed in series with the meter to determine the meter factor during stable operating conditions.
It is a recommended practice to periodically use a prover to calibrate each httpservletrequest set header in the measurement system to confirm or re-establish the performance of each meter.
The prover helps account for changes in meter accuracy as well as verifies the repeatability and linearity of the meter. Pipe stationary and Compact mobile are the two most common types of displacement provers in use today. Various types of pipe provers are available, including bi-directional sphere-type provers and bi-directional piston-type provers, which both combine forward and reverse volumes during a single proving cycle.
Bi-directional piston-type provers are better suited for low temperature applications. Smaller size, convenience, and a wide turndown ratio are some of the advantages of compact provers which can be easily mobilized to prove various meters around a site or multiple sites. Proving lowers the uncertainty of metered volumes to enhance accountability at fiscal measurement operations.
In addition to minimizing financial risk, proving enables operators to maintain the accuracy and repeatability of flow meters to reduce maintenance and lifecycle operating costs. Labor costs are also reduced with a prover by providing automated data logging that improves productivity and diminishes the possibility of human error.
Large volume pipe provers are most often put into service for hydrocarbon and chemical processing applications and are generally best suited for pipeline metering terminals, tanker- and dr.
martens primavera/estate 2018 ecletic hackney 7 eye stivale facilities, refineries and petrochemical plants, and metering of liquid fuels for power plants. Our reliability services are key to avoiding unplanned shutdowns, increasing yield and reducing costs. Our performance services offer expertise and support to help take your operation to the next level.
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Validating the specifications, value and safety of your raw materials, products and assets. Formally confirming that your products and services meet all trusted external and internal standards. Intertek Water Draw pipe prover services include expert calibrating of pipe provers, witnessing, and related pipe prover activities and expertise.
Additional services include repairing pipe provers, meter fabrication, meter calibration, trouble-shooting, accurate flow rate measurement, and more. Intertek calibrates provers using the water draw and master meter methods for prover calibration.
Additional services include prover repair, meter calibration, and trouble-shooting accuracy between meters and provers. Prover calibration units are portable, and are brought on-site. The water draw units work with sphere and piston provers at approximately 70 gallons per minute. For Master Meter method of calibration, master meter is mounted on portable master provers.
Master meter method is capable of flow rate ranges from 40 gallons per minute to gallons per minute. Click to view. Download our Brochure. Learn more about our Tank Calibration Services. Intertek Global Website. Toggle navigation Intertek.
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Metering and calibration expertise: Meter Proving Metering and Calibration. Send us a request Need help or have a question? Need help or have a question? Petroleum Industry Services. X Title.Pipe or compact provers are often used in Metering Systems for frequent calibration on actual process conditions. The base volume of these provers needs to be regularly determined to the lowest possible measurement uncertainty.
Provers and master meters
Prover calibration is recommended to:. A waterdraw calibration unit is generally portable and consists of a water reservoir, a low-pressure centrifugal pump, associated pipe work, hoses and a four-way valve.
The centrifugal pump circulates water from the reservoir through the prover. To reduce the uncertainty caused by test measure scale reading errors, the number of test measures filled during a calibration pass shall be kept to the minimum possible, based upon the volume of the prover and the number and sizes of the test measures available.
Our team of calibration experts is at your disposal, please contact your local office to check their availability.
Accept Read More. Necessary Always Enabled.A gas meter prover is a device which verifies the accuracy of a gas meter. Provers are typically used in gas meter repair facilities, municipal gas meter shops, and public works shops.
Provers work by passing a known volume of air through a meter while monitoring the gas meters register, index, or internal displacement. The prover then displays a proof, a value expressed as a percent which compares the volume of air passed with the volume of air measured to determine the meters accuracy.
Since the early s, bell provers have been the most common reference standard used in gas meter proving, and has provided standards for the gas industry that is unfortunately susceptible to a myriad of immeasurable uncertainties. A bell prover commonly referred to in the industry as a "bell" consists of a vertical inner tank surrounded by an outer shell. A space between the inner tank and outer shell is filled with a sealing liquid, usually oil.
An inverted tank, called the bell, is placed over the inner tank. The liquid provides an air-tight seal. Bell provers are typically counterweighted to provide positive pressure through a hose and valve connected to a meter.
Sometimes rollers or guides are installed on the moving part of the bell which allows for smooth linear movement without the potential for immeasurable pressure differentials caused by the bell rocking back or forth. Bells provide a volume of air that may be predetermined by calculated temperature, pressure and the effective diameter of the bell. Bell scales are unique to each bell and are usually attached vertically with a needle-like pointer.
When proving a meter using a manually controlled bell, an operator must first fill the bell with a controlled air supply or raise it manually by opening a valve and pulling a chained mechanism, seal the bell and meter and check the sealed system for leaks, determine the flow rate needed for the meter, install a special flow-rate cap on the meter outlet, note the starting points of both the bell scale and meter index, release the bell valve to pass air through the meter, observe the meter index and calculate the time it takes to pass the predetermined amount of air, then manually calculate the meter's proof accounting for bell air and meter temperature and in some cases other environmental factors.
Uncertainties commonly experienced, and possibly unaccounted for within a test when using bell provers can lead to incorrect proofs, by which an operator may adjust a gas meter incorrectly. Temperature inconsistencies between the bell air, meter and connecting hoses can account for most meter proof inaccuracies.
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Other factors may be mechanical such as stuck or sticky bell rollers or guides, loose piping connections or valves, a dent in the test area of the bell, incorrect counterweights, and human errors in the operation or calculations. The invention of programmable logic controllers PLC allowed gas meter repair facilities to automate most of the manual bell prover's process and calculations. Instead of manually raising and lowering the bell prover, solenoid valves connected to a PLC control air flows through the meter.
Temperature, pressureand humidity sensors can be used to feed data into an automated bell PLC, and calculations for meter proofs can be handled by a computer or electronic device programmed for such a purpose. Sensors to read the index of a meter were added to further automate the process, removing much of the human error associated with manual bell provers. The natural evolution of the automated bell and PAC controls led itself to the use of vacuum driven provers with arrays of sonic nozzles utilizing choked flow to provide precise flow rates.
Such a use eliminated the need for a bell, as the flow rate is provided through the nozzles. When sufficient vacuum is applied to a sonic nozzle it creates a constant flow rate. Bernoulli's principle is applied to calculate the chosen flow rates chosen by the user or automated by a computer. Computers and PAC systems automate the process, and most sonic nozzle provers are capable of displaying not only meter proofs to a user, but are also capable of transmitting proofs as well as other important data to database systems across a computer network.
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Meter proving is the physical testing of the performance of a liquid meter in a liquid service. The main purpose of the test is to assure accuracy.
The basic principles of proving a liquid meter are the same whether it is a Coriolis meter, turbine meter, or a positive displacement meter. Each type of meter has its own characteristics when being proved, but the basic principles are the same:. When proving a meter, the process-fluid conditions must be as stable as possible throughout the proving process.
This includes:. Before starting a meter proving, let the liquid flow through the meter and prover long enough so that the conditions stabilize.
Check for leaks or fluid bypassing around the prover or meter. The only way to obtain a reliable meter factor is to have all the liquid that is measured by the meter also measured by the prover. Therefore, the meter is proved to adjust for these changes, and the meter factor is applied when calculating the total net volume.
Meters are proved on a periodic basis determined contractually by the buyer and seller or by company policy. Some meters are proved for every batch transaction, which could be several times a day, while other meters may be proved as little as once a quarter. Regular proving ensures that the metering system is providing accurate flow data and confirms the integrity of the metering system.
LACT units are designed for unattended custody transfer of crude oil from a seller to a buyer. The LACT design is determined by:. LACT units have traditionally been fitted with positive-displacement meters, but a turbine meter can be used with certain types of fluid. New units being built today utilize Coriolis meters because they have no moving parts and can offer a lower cost. See Fig. Positive displacement meters require certain accessories to read throughput. Large numeral counters equipped with a switch to operate a sample solenoid or provide a meter-failure circuit are common.Emerson Bi-Directional Pipe Provers provide automated, on-site calibration for every flow metering installation, delivering sustainable measurement, appropriate compliance to accuracy and repeatability requirements, and reduced fiscal risk.
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Request Quote. Learn About. Download Full Specs. Meet multiple specific application needs with highly accurate and customizable on-site meter validation Reduce costs, minimize metered volumes uncertainty, and enhance accountability at fiscal measurement operations Ensure optimized proving systems with expert engineering and design Improve productivity and minimize the possibility of manual operator errors with automated data logging Comply with the recommendations of API Chapter 4.
Download Case Study. Our Businesses. Consider It Solved. All rights reserved.Meter Engineers is recognized as the leader in the field of meter prover calibrations. The calibration procedure known as the volumetric water draw method establishes the known volume of the pipe prover at base conditions.
This method is performed by displacing water from the prover into field standard test measures. Meter Engineers has highly trained technicians to calibrate your unidirect prover, bidirect prover, tank prover, or compact prover. Each water draw unit consists of a water reservoir, stainless steel test measures certified by NIST, certified thermometers, pressure gauge and large centrifugal pumps to accommodate any size sphere or piston prover.
All of our portable water draw calibration units are completely self-contained. Equipped with associated pipework, hoses, 4-way valve, and on board generators.
This method establishes the volume of the measurement section in the prover at base conditions utilizing a weighing system consisting of scales, certified weights, and containers to hold the water. Water Draw Calibration. Volumetric Water Draw Calibration Process Meter Engineers is recognized as the leader in the field of meter prover calibrations. All procedures and calculations follow API recommendations. Gravimetric Water Draw Calibration Process Coming soon… This method establishes the volume of the measurement section in the prover at base conditions utilizing a weighing system consisting of scales, certified weights, and containers to hold the water.