Liquid Controls Avery-Hardoll BM Series, Руководство по обслуживанию и список запасных частей

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TP0003B BM METER
Chap 1
Page 1 INTRODUCTION
Chapter 1
INTRODUCTION
1 GENERAL INFORMATION
1.1 Avery--Hardoll brand bulkmeters are precision made liquid measuring instruments designed for use
with a variety of bulk liquids and maintain accurate metering over long periods of operation. Simplicity
of design and construction together with sustained accuracy has led to wide use of the meters by oil
companies, government departments, and chemical plants around the world.
1.2 The bulkmeter consists of a body casing containing a rotor assembly with four vanes in opposing
pairs, each pair connected by rigid rods. An inlet and outlet manifold is bolted on top of the casing.
FIG 1.1 CAPSULE SIZES
SINGLE DOUBLE TRIPLE
1.3 The basic design of all the series is similar. The higher flow rating for larger meters is achieved by
bolting casings together and fitting them with multiple rotor assemblies respectively with larger
manifolds to suit. See Fig 1.1.
1.4 The series consists of eight meters for pipeline sizes of 2.5 to 6 inches and are of the positive
displacement type as illustrated in Fig 1.2.
1.5 All meters can either be left or right hand discharge and mounted horizontally or vertically.
1.6 The operation of the meter is as follows: Product enters the meter through the inlet side of the
manifold and causes the rotor to revolve by pressure on the vanes. The proximity of the rotor to the
front and rear of the casing forms an efficient seal, whilst the profile of the casing guides the vanes
onto the measuring crescent.
1.7 The manifold and body are constructed separately to avoid pipework stress being transmitted to the
metering crescent.
1.8 The meter is not affected by variations in flow up or downstream.
1.9 Accurate readout is possible because:
•
The volume contained within the measuring crescent is highly repeatable.
•
The dimensions of the measuring chamber are reasonably insensitive to changes of
temperature.
•
The use of pressure balanced end covers minimises pressure induced distortion within
the measuring chamber.
•
Meter body materials are chosen for their excellent wear and low frictional properties.