Frequently Asked Questions
Centrifuges are custom designed based on Material of Construction constraints imposed by design and operating conditions (typically pressure and temperature) of the process. Further, such equipment is customized to conform to the area classification of the process environment.
The hydraulic has more torque, is more efficient and allows full torque and differential speed even at standstill. It is the most advanced backdrive and also works completely independent of bowl speed and direction.
Use bench tests to determine the proper polymer. Then start at a high dose and when the process works well, gradually reduce the dosage until the centrate turns slightly gray. Then increase the dose slightly. This is your most economical setting.
The difference in speed between bowl and scroll. Higher differential allows for cleaner centrate and more GPMs. Lower differential gets drier cake.
This depends on the product. After the unit is set up initially, start with a higher differential and then gradually reduce it until the centrate shows some particles in it. Then slightly increase the diff speed.
On high torque hydraulics (4 digit Rotodiff models) operating range is 50 bar to 200 bar continuous.
A leading scroll is faster than the bowl, a lagging scroll is slower than the bowl. To change it, reverse the direction of the bowl (main drive). This is not possible with gearbox back drives.
Depends on the product settling speed. Start with 90% speed for wastewater sludge for example. Once all parameters are set and the process works well, go to max speed. Then without changing other parameters, take a sample, then reduce speed 100 rpm at a time and wait 10 minutes before taking next sample. The preferred speed is the lowest speed at which acceptable process can be maintained. Higher speeds will cause more stress on the machine.
Every 4000 hours or twice a year whichever occurs first.
Water (condensation) in the oil will cause this. Sample the oil frequently to check for evidence of water. Contamination decreases hydraulic system life.
See previous answer
Recommended inspections are at 10,000.00 hours or every 2-3 years. Rebuilds at 15,000 hrs.
Bearing change is a preventative maintenance only, it does not repair anything. A repair includes complete inspection, balancing, new bearings and seals and normal wear repair. A rebuilt will include all the above and also bringing the unit up to original spec and condition.
We stock a large amount of competition parts that either meet or exceed OEM quality.
We repair all brands of decanter centrifuges.
See storage procedures under “installation information”