meter provers

Bidirectional Meter Prover

BDP-112
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Does Weamco repair or refurbish meter provers?

Yes, at our Sapulpa, OK, USA facility we have the ability to repair, refurbish or replace part or all of the meter prover, including all types of internal and external coatings and we have our own inhouse calibration lab.
Types of Provers we can repair:
• Bi-Directional pipe provers that use a sphere (ball) displacer.
• Uni-Directional pipe provers that use a sphere (ball) displacer.
• Both stationary and mobile units on trucks or trailers.

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Unidirectional Prover

UFP-112
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Portable Meter Provers

PVP-112
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What is the life expectancy of a typical conventional ball/sphere prover?

There are many things that can affect the life of a Prover, but in our experience, we routinely see our provers typically be in service well passed 20, 30 years plus depending on the prover and the service. We recently (in 2022) sold some replacement O-Rings for a couple of ball provers Weamco built in 1986 & 1987. Thats 36 years and still going!

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Prover Refurbishment

PVP-112
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What is a displacement type Liquid Meter Prover?

As stated in API Chapter 4 Section 2, all types of displacement prover systems operate on the principle of the repeatable displacement of a known volume of liquid from a calibrated section of pipe between two detectors. This base volume, also referred to as the prover measurement section is calibrated using Test Measures (Cans) certified and traceable to (NIST), the National Institute of Standards and Technologies, US Department of Commerce. Displacement of the volume of liquid is achieved by an oversized sphere or a piston traveling through the pipe. A corresponding volume of liquid is simultaneously measured by a meter installed in series with the prover.

The object of proving meters with a prover is to provide a number with a defined discrimination level, which can be used to convert the meter indication to an accurate quantity of fluid passed through the meter. This number is referred to as a meter factor.

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Meter Prover Accessories

Once you find a meter prover, you may find yourself in need of accessories. Whether you're looking for an actuator or sphere, we have everything you need to get your project going. See all our meter prover accessories below.

Mag-Tek™ 24 VDC 4-Way Valve Actuator

PN 2412610
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Sphere Pumps

SP-112
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Sphere Removal Products

SRP-022
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Sphere Sizing Products

SSP-022
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Spheres

SPH-022
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General FAQ

Estimating pressure drop across strainers?

Weamco has pressure drop charts and graphs available for a variety of our strainers. (Please see specific strainer on web site or feel free to contact us at your convenience.)
The information on our charts and graphs is a combination of substantial engineering and a vast amount of actual experience.

In regards to estimating pressure drop across a clogged strainer, Weamco is very cautious and we typically resist engaging in this practice due to our many years of experience. Although there has been an attempt by many to estimate this scenario i.e., pressure drop of a clogged basket, we know from actual test results that the actual area clogged can have a significant influence to the flow and resulting pressure drop results. With this in mind since there is no way to know the pattern of the clogging of a basket at any given time, it is very difficult to accurately estimate the affect to pressure drop.

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Calculating basket open area ratios (OAR)?

A common term used in strainer design is “Open Area Ratio (OAR)”. This equals the total open basket area divided by the internal cross-sectional area of the inlet pipe.

Published open area ratios for Weamco products are typically figured using a single 40% open area basket media. Open area ratios for Weamco fabricated permanent strainer types are calculated using the line of site method. There are two methods of instruction typically recommended by recognized establishments and manufacturers for calculating the open area of a strainer basket. One method referred to by the US military as “line of sight” uses the accrual of the open areas of the basket medias in series. Using this method, a 40% open area media in series with a 50% open area media has a calculated combined open area of 20%. An alternative method used in accordance with the US Underwriters Laboratories Standards, allows for the use of only the open area of the more restrictive media in the series. This would be 40% for the example above. In either case, the method used should be documented, as it has a direct impact on strainer design parameters such as sizing and estimating pressure drops.

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What types of meter provers does Weamco manufacture?

• Bi-Directional pipe provers both stationary and mobile:
A positive displacement type prover with flow and displacer (usually a sphere) traveling in both directions by means of a 4-way diverter valve.
• Uni-Directional pipe provers both stationary and mobile:
A positive displacement type prover with flow and displacer (usually a sphere) traveling always in one direction, by means of a transfer chamber, or interchange.
• Volumetric Tank Prover:
As the name implies, this prover is a calibrated tank or vessel with a sight gauge and scale to read a metered volume. The flow must be stopped to determine the
volume.

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Where is the best place to buy a conventional Liquid Meter Prover?

Weamco of course!

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Who is API?

The American Petroleum Institute (API) represents all segments of America’s oil and natural gas industry. Its nearly 600 members produce, process and distribute most of the nation’s energy. The industry supports millions of U.S. jobs and is backed by a growing grassroots movement of millions of Americans. API was formed in 1919 as a standards-setting organization. In their first 100 years, API developed more than 700 standards to enhance operational and environmental safety, efficiency and sustainability.

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Who is NIST?

Founded in 1901, NIST is a non-regulatory federal agency within the U.S. Department of Commerce. According to NIST, their mission is to promote U.S. innovation and industrial competitiveness by advancing measurement science, standards, and technology in ways that enhance economic security and improve our quality of life.
The calibration services of NIST are designed to help the makers of precision instruments achieve the highest possible levels of measurement quality and productivity.

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What does liquid custody transfer mean?

Liquid custody transfer is defined as a metering point (location) where a fluid is being measured for sale from one party to another.

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What types of Meters are typically used in custody transfer liquid applications?

There are four types of Meters typically used in liquid custody transfer measurement.
 Positive Displacement (PD) Meters
 Turbine Meters
 Coriolis Mass Flow Meters (CMFM’s)
 Liquid Ultrasonic Flow Meters (LUFM’s)

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