TP0003B
BM METER
Chap 2
Page 3
TECHNICAL DESCRIPTION
3
BODY ASSEMBLY
3.1
The body assembly comprises a body casing with front and rear double end covers. The body casing
of NI-resist cast iron forms the metering compartment and is machined internally on two concentric
diameters which are joined by blending radii. The larger diameter forms the measuring crescent
(Figure 2.2) and the blending radii are machined out to form the inlet and outlet ports.
3.2
The body casing is fitted with pressure balanced inner end covers, the inner covers are of NI-resist
cast iron while the standard outer covers are of aluminium, NI-resist cast iron is available as an
alternative. The volume between them is fluid filled at line pressure, this ensures that there is no
pressure difference across the inner covers of the measuring chamber and therefore, no distortion.
3.3
A bearing is housed within each inner cover to provide support for the rotor assembly. A bearing
adjuster, screwed into the front inner cover and a compensating spring between the rear bearing and
rear outer cover enables the position of the rotor assembly, within the body, to be adjusted. The front
cover is drilled to allow the calibrating drive spindle to pass through, a spindle seal fits in the outer
cover. The outer face of the outer front cover is designed to allow the calibrating mechanism to be
secured to it. An optional factory fitted cover incorporating a pulse transmitter unit for electronic
calibration/metering measuring is also avaiable.
FIG 2.2 BULKMETER OPERATION
INLET MANIFOLD
BODY CASING
CARBON VANE
ROTOR
MEASURING
CRESCENT
STAINLESS STEEL ROD
PRODUCT
FLOW
S13611
4
DYNAMIC SEALS
4.1
A dynamic pressure tight seal is fitted within the front cover. Seal material can be either Nitrile or
Fluorocarbon depending on the product in use. See below for a guide to suitable seals:
Products suitable for use with NITRILE SEALS
Kerosene (without additives)
Diesel
Heavy black oils
Jet A1
Содержание Avery-Hardoll BM Series
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