Brodie BiRotor BA-89, Installation And Operation Manual

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4.0 Maintenance
CAUTION
Extreme care must be exercised when the
measuring chamber is exposed and handled. Hands
must be kept clear of the timing gears, rotors and
measuring chamber or serious personal injury can
occur. Due to the precision balance of the rotors and
timing gears, they can be set in motion easily. Keep
hands clear of these parts at all times! At no time
should hands be used to brace these parts while
servicing.
4.1 General
The amount of maintenance necessary for
efficient meter performance depends upon such
factors as:
1. Continuity of Operation A meter which
operates almost continuously, obviously will
require more attention than one on
intermittent duty.
2. Rate of Flow The practical life of any piece of
equipment is proportional to its speed of
operation. A meter operating at, or close to its
maximum rating will naturally have a shorter
life than one operating at a reduced rate.
3. Lubricating Value of Product Other factors
being equal, a meter handling a light
lubricating oil will have a longer life than one
measuring a dry motor fuel.
4. Cleanliness of Product Abrasive solid matter
accelerates meter wear.
Meters that are given a little attention regularly
will deliver better performance and have a
longer life than those that are given no attention
until they have failed. Frequently a meter’s
performance will depend, to a considerable
extent, upon the proper functioning of the
accessory equipment in the piping system.
Following are listed some of the conditions and
factors influencing meter performance:
1. A meter should be kept filled with the liquid it
is measuring. Draining results in the formation
of deposits and gums which increase the
mechanical friction. Any leaky shut off valves
or check valves which would permit the meter
to drain should be repaired or replaced.
2. A petroleum meter should be kept free of
water. Usually, regular inspection and draining
of storage tanks is sufficient protection.
3. Clean the strainer basket frequently.
4. Soft closing loading valves or shock
chambers for eliminating water hammer
should be kept in good working order.
5. The valves and operating mechanism of an
air eliminator should be given occasional
inspection. This is especially true where a
critical air condition exists and for this reason,
meter performance is very dependent upon
proper air elimination. The valves and
operating mechanism of an air eliminator are
subject to very difficult operating conditions.
With some products alternate wetting and
drying results in gum formations. The vapors
of most petroleum products are more
corrosive than the liquids. In some
installations salt air is a corrosive factor.
6. The counter of the meter should be given
some protection during extreme weather
conditions.
7. A meter taken out of service for any length of
time should be filled with light lubricating oil.
8. Keep appropriate service bulletins available
for reference.
CAUTION
Before performing any disassembly or reassembly
procedures, all flow to meter should be off. All
electrical connections to accessories should be
disconnected. Service should be performed by
trained and qualified personnel only.
4.2 Removal of Measuring Unit
(Reference Figure 4.1)
1. Remove drain plug (item 16), drain meter and
replace plug.
2. Remove all accessories, including adjustor
(item 7) and counter base plate (item 4) by
removing screws (items 6 and 8).
3. Remove meter from line to allow for further
disassembly.
4. Turn the meter on end, to rest on the inlet
flange.
5. Remove nuts and screws (items 10 and 11)
and lift off the outlet housing (item 15).