This Standard specifies a method of liquid flow rate measurement in
closed conduits by measuring
the mass of liquid delivered into a weighing tank in a known time
interval. It deals in particular
with the measuring apparatus, procedure, and method for calculating
the flow rate and the
uncertainties associated with the measurement.
The method described may be applied to any liquid, provided that its
vapor pressure is such that
any escape of liquid from the weighing tank by vaporization is not
sufficient to affect the
required measurement accuracy. Closed weighing tanks and their
application to the flow measurement
of liquids of high vapor pressure are not considered in this Standard.
This Standard considers only the measurement techniques and does not
address any possible hazards
involved in handling the liquid involved.
Theoretically, there is no limit to the application of this method,
which is used generally in
fixed laboratory installations only. However, for economic reasons,
typical hydraulic laboratories
using this method can produce accurate flow rates of 500 kg/s (3300
lbm/sec) or less.
Owing to its high potential accuracy, this method is often used as a
primary method for calibration
of other methods or devices for mass flow rate measurement or
volumetric flow rate measurement,
provided that the density of the liquid is known accurately. It must
be ensured that the pipeline
is running full with no air or vapor pockets present in the measuring
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