1 edition of Evaluation of positive displacement cryogenic volmetric flowmeters found in the catalog.
Evaluation of positive displacement cryogenic volmetric flowmeters
by U.S. National Bureau of Standards, For sale by the Supt. of Doc., U.S. Govt. Print. Off. in [Washington]
Written in English
|Statement||J.A. Brennan ... [et al.]|
|Series||NBS technical note ; 605, NBS technical note -- 605|
|Contributions||Brennan, J. A, Compressed Gas Association|
|The Physical Object|
|Pagination||128 p. in various pagings :|
|Number of Pages||128|
1. Flow meters – Handbooks, manuals, etc. I. Title. TAM43B35 – dc21 CIP ISBN 0 8 hardback DISCLAIMER Every effort has been made in preparing this book to provide accurate and up-to-date data and information that is in accord with accepted standards and practice at the time of publi-. Positive Displacement Flowmeter. The measuring chamber of the iSOLV Bi-Rotator positive displacement flowmeter consists of a body, a pair of rotor gear and a top cover. A cavity with a known volume is formed and functions as the measuring chamber of the flowmeter.
Positive-displacement flowmeters measure the volume of liquid flowing through the flowmeter. Increasing the temperature of the liquid will cause the flowmeter body to expand and cause it to under-register (Answer B). However, in many applications, positive-displacement flowmeters are used to infer mass flow even though they measure volumetric flow. One major growth factor for positive-displacement flowmeters is the large installed base worldwide. Because they were introduced more than years before new-technology meters. Installed base is a relevant growth factor because often when ordering flowmeters, especially for replacement purposes, users often replace like with like.
Positive displacement flowmeters are some of the most accurate flowmeters available today. They can easily obtain flow measurements within % of the true value. They are unique because they are the only type of flowmeter that directly measures the volumetric flowrate. Additionally, positive displacement flowmeters require no power and are. A flow meter (or flow sensor) is an instrument used to measure linear, nonlinear, mass or volumetric flow rate of a liquid or a gas. When choosing flowmeters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site.
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Additional Physical Format: Online version: Evaluation of positive displacement cryogenic volmetric flowmeters. [Washington]: U.S.
National Bureau of Standards: For. Abstract. Supt. of Docs. no.:CBibliography references: p. Mode of access: Internet. and PD (positive displacement) flowmeters.
In addition, the thermal shock of fluids at these Evaluation of positive displacement cryogenic volmetric flowmeters book temperatures presents material compatibility concerns when using O-rings, glands, or dissimilar metals as wetted parts.
As a result, reliable measurement of cryogenic liquids is. Cryogenic engineering requires the measurement of both extensive and intensive properties of cryogenic liquids. Transducers are required for liquid level (quantity), both point and continuous systems, and mass rate systems. Positive Displacement Flowmeters feature two precisely machined rotating members inside a measuring chamber of known volume which may be used to accurately determine volumetric flow rate as a function of the rotors’ velocity.
The advantages that the Positive Displacement Flowmeter provides over other technologies are numerous. Positive Displacement Meter is a type of flow meter that requires fluid to mechanically displace components in the meter in order for flow measurement.
Positive displacement (PD) flow meters measure the volumetric flow rate of a moving fluid or gas by dividing the media into fixed, metered volumes (finite increments or volumes of the fluid).
Flow Meters for Cryogenic Fluids - a variety of technologies for monitoring the flow rate of cryogenic fluids. How flowmeters work About Us DIstributor Portal Login Tech Support Contact Us For personalized help, call () Login or Sign Up.
0 items in your cart. Menu. Dial Dwyer offers different types of Dial Flowmeters for various applications. Flow meters measure water, oil, gas or air flow rates. Applications include calculating required fill or drain times for tanks, water towers, backflow prvention, heat exchangers, and oil & gas equipment.
Abstract. There are two alternative ways to tackle the problem of measuring mass flowrate. One is to design a meter whose response is a function of mass flowrate only, so that a knowledge of the physical properties of the fluid is not necessary.
At cryogenic conditions, these liquids provide little lubrication for moving parts and therefore create major challenges for traditional turbine and positive displacement flowmeters. Additionally, the large temperature gradient presents concerns when O-rings, glands, welds, or dissimilar metals are present in the flow stream.
As a. The pulse or frequency output are processed by secondary instruments ranging from a basic signal conditioner, indicator/totalizer to more complex flow computers, which compensate temperature, pressure, density, viscosity and provide accurate volumetric or mass flow measurement.
POSITIVE DISPLACEMENT FLOW METER CATALOG SHEET. Positive displacement flowmeters measure the volumetric flow of fluids in pipes, such as water, hydrocarbons, cryogenic liquids, and chemicals.
Some designs can measure gas flow although liquid flow applications are much more prevalent. In liquid service, increasing viscosity decreases slippage and increases the pressure drop across the flowmeter.
Positive Displacement ve displacement flow meters measure the volumetric flow of fluids in pipes, such as water, hydrocarbons, cryogenic liquids, and chemicals.
Some Blancett B positive displacement gear flow meters are similar in design to the. positive displacement flow meter applications. Easy to Operate & Maintain Liquid Controls Positive Displacement Flowmeters are precision made liquid measuring instruments that maintain precise and accurate metering over long periods of operation.
Simplicity of design and construction, together with sustained accuracy, has led to the widespread use of PD Series meters within a variety of highly valuable custody transfer. Reciprocating or oscillating piston. Each piston is mechanically or magnetically operated to fill a cylinder with the fluid and then discharge the fluid.
Each stroke represents a finite measurement of the fluid (can be a single or multi-piston device). Posted in Positive Displacement Flow Meter on April 9, Positive displacement flow meters are essentially apt for measuring volumetric flow rate of the liquid or gas that helps in mechanical displacement of components that are present inside the meters.
An Evaluation of positive displacement cryogenic volmetric flowmeters /, by J. Brennan and Compressed Gas Association (page images at HathiTrust) Flow meter engineering handbook, (Philadelphia, ), by Brown Instrument Company (page images at HathiTrust).
A positive displacement flow meter is a cyclic mechanism built to pass a fixed volume of fluid through with every cycle. Every cycle of the meter’s mechanism displaces a precisely defined (“positive”) quantity of fluid, so that a count of the number of mechanism cycles yields a precise quantity for the total fluid volume passed through the flow meter.
Positive Displacement flow meters are the only flow measuring technology to directly measure the volume of fluid that passes though the flow meter. It achieves this by trapping pockets of fluid between rotating components housed within a high precision chamber. The Brooks BM01 and BM02 are low flow positive displacement oval flowmeters designed for applications requiring the high accuracy measurement of clean liquids with viscosities less than Cp.
Units are available with a pulse output from a Reed switch or solid state Hall effect switch for remote registration and/or totalization.These spur gear positive displacement flowmeters are suitable for a variety of industrial applications, including chemical injection skids, fuel and solvent measurement, liquid .A positive displacement flowmeter is a cyclic mechanism built to pass a fixed volume of fluid through with every cycle of the meter’s mechanism displaces a precisely defined (“positive”) quantity of fluid, so that a count of the number of mechanism cycles yields a precise quantity for the total fluid volume passed through the flowmeter.