5- Steam meters (Measurment instrument)
(old answer)
İt is often required that steam be metered to determine energy efficiency, process control, usage, and equipment efficiency as well as for measurement of the amount of steam used within a facility for utility company billing purposes.
A steam meter must compensate for steam quality as well as pressure and temperature.Performance of different types of meters will vary.Most meters depend on volume measurement, which is dependent on pressure.Measurement must be taken at the appropriate pressure, otherwise corrections have to be applied to the reading. Metering should be done downstream of a properly designed pressure reducing valve station.
(new answer) (better)
The apparatus for recording
such evoporation is of two general classes: Those measuring water before it is
fed to the boiler and those measuring the steam as it leaves. Of the first, the
venturi meter is perhaps the best known, though recently there has come into
considerable vogue an apparatus utilizing a weir notch for the measuring of
such water. Both methods are resonably accurate and apparatus of this
description has an advantage over one measuring steam in that it may be calibrated
much more readily. Of the steam-measuring
devices the one in most common use is the steam-flow meter. Provided the
instruments are selected for a proper flow, etc., they are of inestimable value
in indicating the steam consumption. Where such instruments are placed on the
various engine-room lines, they will immediatly indicate an excessive
consumption for any one of the units. With a steam-flow meter placed on each
boiler, it is possible to fix relatively the amount produced by each boiler,
and, considered in connection with some of the “check” record described below,
clearly to indicate whether its portion of the total steam produced is up to Standard
set fort he over-all boiler-room efficieny.
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