B-320-2-E
32
9.3 Meter Body Disassembly and Inspection
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Although it depend on individual operating conditions, periodic disassembly and inspection should
be performed at least once a year.
CAUTION: Because the Oval flowmeter is a precision industrial instrument,
disassembly and inspection should be performed indoors as a rule. If
it is desired to disassemble and inspect it as installed in the field, an
important precaution to remember is to reduce the internal pressure
of the piping assembly to a safe level, shut off valves upstream and
downstream of the meter completely, drain the piping assembly and
then place a suitable fluid receptacle directly below the flowmeter.
Exercise care to keep each component disassembled free from grit and
dust.
- Meter Inspection
When the fluid does not flow through the meter, the oval rotors might be stuck with scales, resulting in
stop of their rotation.
9.3.1 Single-case Construction Meter Body Disassembly and Inspection
NOTE: Size 29 single-case construction meter body is shown here. The same procedure applies to other
size meters.
(3) Remove oval rotors from the measuring chamber
and inspect them for condition. (Rotor shafts
should be drawn out straight forward.)
(a) Inspect the oval rotors to see if they are stuck
with foreign solids.
(b) Check the rotors, shafts and other components
for wear.
(c) Inspect the measuring chamber and the inner
wall of front cover for damage or any other
sign of unusual condition.
Upon completion of these inspections, clean the
oval rotors, rotor shafts, measuring chamber and
front cover with clean water or suitable solvent
thoroughly.
ROTOR SHAFTS
METER BODY
ROTORS
THRUST RINGS
(1) Take off all the twelve hex bolts (105), using wrench.
(2) With the front cover removed, the measuring
chamber with oval rotors and other components
are accessible.
FRONT COVER
O-RING
HEX BOLTS
CAUTION:
1. Deep scratches, high spots due to impressions, or other flaws should be reconditioned flat
with oil stone or other tool.
2. If the areas which have been forcibly in contact with front cover jacking bolts are distorted
outwardly, recondition it flat with oil stone.
3. Excessive reconditioning may result in a loss of meter accuracy.
