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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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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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• 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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Weamco of course!

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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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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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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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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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Weamco Products are carefully packed and prepared for shipping specifically to best prevent damage during transportation. Care should always be taken during product unpacking and installation to prevent damage to the product including all flange or sealing surfaces, along with any additional instrumentation or attachments that may be present. Any handling instructions shown on the product, product drawings, packing and or containers should be closely adhered to.

An initial inspection of all products and packaging should be done at time of receipt. Upon inspection, if any “damage to product or packaging” is evident, immediately bring this to the attending delivery persons attention and document the damage including pictures if possible. If they are no longer present, contact the company or individual responsible for shipping and request that a representative of the shipping carrier be present before further removal or unpacking of the product. Please feel free to contact Weamco or your local Weamco representative at any time for assistance.

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