ASME MFC-22-2007 pdf free download.Measurement of Liquid by Turbine Flowmeters.
3 DEFINITIONS AND SYMBOLS
Much of the vocabulary and many of the symbols used in this Standard are defined in ASME MFC-1 M. Others that are unique in the field under consideration, or with special technical meanings are given in para. 3.1. Where a term has been adequately defined in the main text, reference is made to the appropriate paragraph.
3.1 Definitions
base flow raft: flow rate converted from flowing conditions to base conditions of pressure and temperature, generally expressed in units of base volume per unit time (e.g., gpm, mi/h, etc.).
base pressure: a specified reference pressure to which a fluid volume at flowing conditions is reduced for the purpose of billing and transfer accounting. It is generally taken as 14.73 psia (101.560 kPa) by the gas industry in the U.S.
base temperature: a specified reference temperature to which a fluid volume at flowing conditions is reduced for the purpose of billing and transfer accounting. It is generally taken as 60°F (15.56°C) by the gas industry in the U.S.
base volume: volume of the fluid at base pressure and temperature.
flowisig pressure: static pressure of the fluid at the flowing condition.
flowing frmpcrature: the temperature of the fluid at the flowing condition.
linea ray: linearity refers to the constancy of K factor over a specified range. defined by either the pipe Reynolds number or the flow rate. A typical liquid turbine meter performance curve is shown in Fig. 1. The linear range of the turbine meter is usually specified by a band defined by maximum and minimum K factors, within which the K factor for the meter is assumed to be Km,. The upper and lower limits of this range can be specified by the manufacturer as a function of maximum and minimum Reynolds number ranges, a flow rate range of a specified fluid, or other meter design limitations such as pressure, temperature, or installation effects.
4.2 Output and Readout Device
4.2.1 The rate of revolution of the rotor is normally determined from the blade passing frequency or by other means that relates to the rate of rotation.
4.2.2 Turbine meter output may be mechanical, electrical, electromechanical, optical, analog, and digital. The readout devices may be of any form suitable for the application.
4.2.3 For electrical pulse output meters, the output md odes the pulse detector system and all electrical connections necessary to transmit the indicated rotor revolutions outside the body for uncorrected volume registration.
S SELECTION OF METER AND ACCESSORY
EQUIPMENT FOR FLOW RATE DETERMINATiON
For proper selection and operation of the meter, the following information may be necessary:
(a) fluid properties of the flowing stream including viscosity, vapor pressure, toxicity, corrosiveness, lubrication properties, specific gravit , etc.
(b) flow rate range and operational conditions including unidirectional or bidirectional flows and continuous or intermittent flows
(c) performance characteristics that are required for the application including linearity over a specified flow range, repeatability at any flow rate, and improved linearity over a flow range
(d) the flange rating, area classification, materials, and dimensions of the equipment used
(e) available space for the meter installation and pros’ing facility, if required for the application
(f) operating pressure ranges, acceptable pressure losses through the meter installation, and necessary consideration to avoid vaporization of the fluid while passing through the meter
(g) operating temperature range and the applicability of the automatic temperature compensation
(h) effects of corrosive fluids and contaminants on the meter
(i) amount and size of the suspended solids in the flowing stream including filtering equipment for the metering section
(j) types of readout and printout devices, or desired output system to be used for signal preamplification and output units of the measurement as required
(k) for multiple meter-run installations and how a meter is taken in or out of service during operation of the entire system.