ASME MFC-1:2014 pdf free download

ASME MFC-1:2014 pdf free download.Glossary of Terms Used in the Measurement of Fluid Flow in Pipes.
cow riance matrix: in a multivariate probability distribution, the matrix V with elements equal to the variances and covariances of the variables is termed the covariance matrix. The diagonal elements, v(z, z) a2(z) or u(z1, z,) a2 (z,), are the variances, while the off-diagonal elements, r’ (y. z) or tr (y,, z1), are the covariances.
coverage: the percentage frequency that an interval estimate of a parameter contains the true value.
NOTE: A 93% conIidencc interval will provide 95% coverage at
the true value.
coverage factor: number larger than one by which a combined standard measurement uncertanty is multiplied to obtain an expanded measurement uncertainty.
NOTE: Coverage factacs are typicaUy in the range of 2 to 3.
critical flow condition: a flow through a differential pressure device such that the ratio of the downstream to upstream absolute pressures is less than a critical value,below which the mass flow rate remains constant when the upstream fluid conditions (density, temperature, and velocity distribution) are unchanged.
crit ical flow devices: a ulowmeter in which a critical flow is created through a primary differential pressure device (fluid at sonic velocity in the throat). A knowledge of the fluid conditions upstream of the primary device and of the geometric characteristics of the device and the pipe suffice for the calculation of the flow rate
critical flow funct ion: dimensionless function that characterizes the thermodynamic flow properties along an isentropic and one-dimensional path between the inlet and the throat of a device (it is a function of the nature of the gas and of stagnation conditions).
critical flow nwasurement: a method whereby critical flow is created using a suitable differential pressure device (with sonic velocity in the throat).
critical flow rate: the maximum flow rate for a particular venturi nozzle that can exist for the given upstream conditions. When critical flow exists, the throat velocity is equal to the local value of the speed of sound (acoustic velocity), the velocity at which small pressure disturbances propagate.
critical pressure nitio: the ratio of the absolute static pressure at the nozzle throat to the absolute stagnation pressure for which gas mass flow through the nozzle is a ma xi mum.
critical venturi nozzle: a venturi nozzle for which the nozzle geometrical configuration and conditions of use are such that the flow rate is critical.
cross-correlation meter: a flowmeter that operates on the principle that two signals, a known distance apart, arc modulated by eddies in the fluid flow. These signals are compared by a correlator, the time taken for an eddy to travel between the two receivers is identified, and hence the flow velocity and the flow rate are calculated. The principle of cross-correlation can be applied to many types of infrctcd or existing signals (e.g.. ultrasonic, thermal, and radioactive signals); see Fig. 5.