ASME MFC-22 pdf download.Measurement of Liquid by Turbine Flowmeters.
ASME MFC-22 describes the criteria for the application of a turbine flowmeter with a rotating blade for the measurement of liquid (lows through closed conduit running full.
The standard discusses the following:
(a) considerations regarding the liquids to be measured
(b) turbine Ilowmeter system
(C) installation requirements
(d) design specifications
(e the maintenance, operation, and performance
(f) measurement uncertainties
This Standard does not address the details of the installation of accessory equipment used to measure pressure, temperature, and/or density for the accurate determination of mass or base volumes, or those accessories used to automatically compute mass or base volumes.
2 REFERENCES
The following is a list of publications referenced in this Standard. Unless otherwLse specified, the latest edition shall apply.
ANSI/NCSL Z540.2-1997 (R2002), U.S. Guide to Expression of Uncertainty in Measurement
Publisher: NCSL International, 2995 Wilderness Place, Suite 107, Boulder. CO 8(1301-5404
ASME MFC-1M, Glossary of Terms Used in the Measurement of Fluid Flows in Pipes
Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, P0. Box 2300, Fairfield, NJ 07007-2300
ISO Guide to the expression of uncertainty in measurement
Publisher: International Organization for Standardization (ISO), 1 ch. de Ia Voie-Creuse, Case postale 56, CH-1211, Genève 20, Switzerland/Suisse
NIST Technical Note 1297 (TN 1297), Guidelines for Evaluating and Expressing the Uncertainty of NIST Measurement Results
Publisher: United States Department of Commerce, Technology Administration, National Institute of Standards and Technology (NIST), 100 Bureau Drive.
(l) instructions for taking samples
(m) details of the general policy regarding the frequency of meter proving and reproving when changes in flow rate or other variables affect meter accuracy
(n) procedures for operations that are not included in this list but that may be important in an individual installation
8.4 Meter Proving
8.4.1 Each turbine meter installation for accounting measurement should contain a permanent prover, connections for a permanent prover, connections for a portable prover, master meter, or some other method of determining the meter’s K-factor and K-factor repeatability on a regular basis. The selection of proving methods should be acceptable to all parties involved.
8.4.2 The optimum frequency of proving depends on so many operating conditions that it is unwise to establish a fixed time or throughput interval for all conditions. In clean liquid ser’ ice at substantially uniform rates and temperatures, meter factors have negligible change in meter performance curve, hence necessitating less frequent meter proving. More frequent proving is required with liquids that contain ahra,ive materials, in liquefied petroleum (1.2) gas service where meter wear may be significant, or in any service where flow rates and/or viscosities vary substantially. Likewise, frequent changes in the type of product necessitate more frequent provings. In seasons of rapid ambient temperature change, meter factors vary accordingl and proving should be more frequent. Studying the meter factor control chart or other historical performance data that include information on liquid temperature and floss’ rate will aid determination of the optimum frequency of proving.
8.4.3 Provings should be frequent (every tender or everyday) when a meter is initially installed. After frequent proving has shown that meter factor values for any given liquid are being reproduced within narrow limits, the frequency of proving can be reduced if the factors are under control and the overall repeatability of measurement is satisfactory to the parties involved.
8.4.4 A meter should always be proved after maintenance. If the maintenance has shifted the meter factor values, the period of relatively frequent proving should be repeated to set up a new database by which meter performance can be monitored. When the values have stabilized, the frequency of proving can again be reduced.
ASME MFC-22 pdf download
