Problem-Solver, Series 6
A fertilizer producer was experiencing problems with three, top-entry agitated preneutralizers,
mixing a phosphoric acid and ammonia slurry The slurry is very thick, with a specific
gravity of 1.5 to 1.6, with process upsets (even relatively minor ones) which can cause the
material to thicken or harden. The agitator shafts were bending and the high resulting loads
were damaging the thrust couplings, drives and motors.
The repairs were expensive, inconvenient and often resulted in costly plant downtime
one quality-control problems.
The local Rexnord distributor pointed out that the installation of bottom bearings,
within the agitators, would eliminate the bending moment the paddle shafts would encounter.
Furthermore, a properly selected Falk fluid coupling would protect the other drive
components from the overloads when an upset did occur The distributor salesman also
suggested using the optional thermal trip plugs and switches to prevent the couplings,
oil fill from contaminating the slurry, should an extended overload occur.
Current Problems
Process upsets were damaging drive components through high overloads.
Vibratory loads upon start-up, even under normal conditions, cause drive fatigue.
After a process upset, the drive motor lacks the capability to restart the agitator.
The True Torque Solution
The Falk fluid coupling overload protection is achieved by a change in oil flow which
spreads the impact over a period of time, relieving stress on the components.
A coupling which transmits power through a liquid will dampen vibrations.
The Falk fluid coupling will allow the same motor to start a higher load, by simply
adding more fluid.
Implementation
The customer purchased three True Torque fluid couplings with thermal trip plugs and switches, and installed bottom bearings in the problem agitators. When the drives were put into production the customer was pleased with the controlled, smooth acceleration the Falk fluid coupling provided.
In this facility the improved system is performing satisfactorily, and agitator failures and the resulting production outages have been avoided. Operations are now running smoothly, production is higher and product quality has improved.
Let us show you how much smoother your equipment will run with a Falk fluid coupling.
CONTACT YOUR REXNORD FLUID COUPLING DISTRIBUTOR FOR THE SOLUTIONS TO YOUR POWER TRANSMISSION PROBLEMS.
Form 860602
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