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  • ASME
    ASME MFC-26 Measurement of Gas Flow by Bellmouth Inlet Flowmeters - All Editions
    Edition: VAR
    $214.20
    Unlimited Users per year

Content Description

This standard applies only to the steady flow of single-phase gasses and gas mixtures and applies only to bellmouth inlet flowmeters in which the flow remains subsonic throughout the measuring section and the flow is steady of varies only slowly with time. It also addresses procedures by which calibration of the device can be made to allow for application with consistent conclusions and with known limits of uncertainty. Bellmouth inlet flowmeters should be used only within the limits for which a given unit is tested, or if additional uncertainty can be tolerated, over a range within which extrapolation is reliable. This Standard outlines the general geometry and method of use of bellmouth inlet flowmeters to determine the mass or volumetric flow rate of the gas or gas mixture flowing through the device. It also gives necessary information for calculating the flow rate and its associated uncertainty. A bellmouth inlet flowmeter is a device that provides flow conditioning and flow measurement whose inlet is located or positioned in a large reservoir or supply source. The reservoir can be outside ambient, room or plenum conditions depending on the application. The bellmouth inlet flowmeter is also referred to as an airbell, nozzle with zero beta ratio, borda tube, etc. Typically geometry consists of a convergent inlet followed by a constant throat area. This flowmeter is a differential pressure type device that allows determination of the flow rate from the differential pressure between the total pressure and static pressure at a single specified axial location in the constant area throat of the bellmouth. Key Features: Benefits: Fundamentals and usage Used extensively in aerospace test facilities for gas turbine engines for flow conditioning and flow measurement. Inlet flare design and measurement considerations are provided. Non-mandatory appendix provided for the development of calculation with derivation. Instrumentation Options for instrumentation methods are provided and the impact on calculation and calibration are discussed. Also provided are total pressure, static pressure, and total temperature measurements and how they must be consistent in calibration and use. Calibration and uncertainty Various methods for developing NIST traceable results for calculated air flow rate in velocity, volumetric and mass flowrates are discussed. Overview of boundary layer growth and other contributors to calibration results are considered. Computational fluid dynamics (CFD analysis is mentioned as significant impact to calibration result. Also provided is an overview of the approach for developing uncertainty statement (data quality with practical steps for determination. Intended for engineers and other users of gas-flow measurement devices in such industries as energy, automotive and aerospace.

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About ASME

ASME is a not-for-profit membership organization that enables collaboration, knowledge sharing, career enrichment, and skills development across all engineering disciplines, toward a goal of helping the global engineering community develop solutions to benefit lives and livelihoods. Founded in 1880 by a small group of leading industrialists, ASME has grown through the decades to include more than 130,000 members in 158 countries. Thirty-thousand of these members are students.

From college students and early-career engineers to project managers, corporate executives, researchers and academic leaders, ASME's members are as diverse as the engineering community itself. ASME serves this wide-ranging technical community through quality programs in continuing education, training and professional development, codes and standards, research, conferences and publications, government relations and other forms of outreach.

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