3.
Check alignment while unit is still hot per alignment procedure outlined earlier.
4.8 Interlocks
Mixer interlocks are additions to the feed pumping system interlocks and alarms and vary mill by mill.
Typically, they depend upon what instruments are available.
The following are the basic guidelines for interlocks.
Steady pump flow must be maintained before adding any chemicals or steam.
•
Installation of flow and consistency measurement in the feed line is recommended.
•
Chemicals or steam can be added only when the minimum flow and consistency levels are satis-
fied. The levels depend on the size of the mixer and pumping system.
The mixer must be running when steam or chemicals are added.
•
It is possible, but not recommended, to pump through the mixer when it is not running, since mixing
will not be effective and chemical usage will be high.
The mixer runs only when the feed pump is running.
•
If the feed pump is down for more than five (5) minutes, the mixer will shut down.
Seal water is required to operate the mixer.
•
The mixer has a cartridge mechanical seal with flush meter and alarm and cannot be operated with-
out seal water.
NOTICE:
Some mixers have a single mechanical seal instead of the double seal.
•
A low seal water flow alarm is recommended should the seal water flow fall below 50% of the set
flow rate.
In C/D stage, dry chlorine cannot be added alone.
CAUTION:
In C/D stage, the mixer material is titanium and dry chlorine will destroy this material!
•
Chlorine has to be mixed with chlorine dioxide or water before it enters into the chemical addition
pipe of the mixer.
4.8 Interlocks
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3501 Installation, Operation, and Maintenance Instructions
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