Bowl – Conveyor Differential RPM and Torque

Differential RPM is the difference between the bowl RPM and the conveyor RPM. The differential is provided by the gearbox which transmits power from the bowl to the conveyor. Differential RPM is simply  calculated by dividing the bowl RPM by the gearbox ratio. Many desanders manufacturers provide a “backdrive” which can independentlyalter the RPM. Backdrive units are, in effect, hydraulic gear reductionsystems used to vary the speed of the conveyor relative to the bowl. On“backdrive” units RPM depends upon the rotation of the gearbox pinionand the orientation of the flights on the conveyor. For these units RPM may be calculated by:

RPM = (Bowl RPM – Pinion Speed)/Gearbox Ratio

RPM is important because it determines the velocity at which solids areconveyed through a centrifuge. For example, a RPM of 50 and a flight pitchof 3 in. yields a conveyance velocity of 150 in./min. Another expression takes the flight pitch and number of leads on the conveyor into accountto describe the surface area of the bowl swept by the conveyor flightsper unit time. The faster the rate at which the area is swept, the greater the solids capacity.

This equation suggests that solids capacity can be increased by increasingthe RPM (lowering the gearbox ratio). Low swept area values couldindicate potential torque problems. For example, centrifuges with 130:1 orhigher gearbox ratios and centrifuges with 80:1 gearbox ratios with singlelead conveyors may be limited in flowrate by torque.Test data indicates that by increasing RPM reduces torque. Also, torquepressure as feed median particle size increases. Despite the common  beliefthat high RPM values agitate the pond and inhibit sedimentation, testresults indicate that the effect of RPM on solids removal efficiency is slight,provided sufficient differential exists to remove the solids.

If you want to get more imformation, you can visit http://gnsolidscontrol.com/.

Solids Control System for Environmental Friendly

There is no doubt that the oil & gas drilling industry is booming. Therefore, concerns from public, organization and government have resulted in regulations and environmental guidelines for handling drilling fluids and relative drilling fluids waste management. GN Solids Control acts as a subcontractor for equipment and systems for recycling drilling fluids.

Oil and Gas Industry

The oil & gas drilling industry is where GN initially launches our solids control equipment including shale shaker, mud cleaner, vacuum degasser and decanter centrifuge etc. Right now, GN has become an important manufacture to supply solids control equipment(http://www.gnsolidsamerica.com/) matching with different drilling rig in all over the world. GN recycled product ensure clean and free of cuttings and other contaminants in the drilling fluids. Therefore, we win a really good reputation within drilling contractors around the world

Mining Industry

In more recent years, GN linear motion shale shaker and fine screening with hydrocyclones combination have become more popular by gold mining and coal mining. Especially, GN 4 panel shaker is capable of processing their products with long term service. GN small decanter centrifuge is desirable for Canadian, Chile and other countries diamond drilling company. Our centrifuge effectively removes the unexpected solids and improves the rate of penetration.

Dredge Slurry Industry

GN solids control system is also applied for the dredge slurry projects to remove silt, sand, small gravel and debris. We can customize different of capacity systems to accommodate requirement of your project such as 1000GPM. 1500GPM, 2000GPM and 1000GPM. We equip with our advance shale shaker and mud cleaner to maximum remove particles and recovery the clean fluids for dredge slurry project

GN has been involved in many solids control project not only provide a pieces of equipment but provide a complete solution for your project. Contact with GN for you solids control project, we will provide a perfect solution for you.

How to Estimate the Effective Volume of A GN Tank

As GN is manufacturing more and more mud tanks every year, more and more customers from abroad are asking for GN Solids Control Co. to give his technical salutations for them. For a salesman, to understand know to calculate the effective of mud tanks in a fast way is very important. Customers will be impressed by a knowledgeable sale.

So today we are willing to share some ways to calculate the effective volume of GN tank.

The GN tank’s effective volume is determined by three factors: one is the inner effective length, the other one is the inner width, and the last one is the height of corrugated board. So the volume equals to the product of these three factors.

When it comes to container type tanks, the effective length is the same as the actual length of the container. However, for a skid type tank, the effective length should be deducted by 500mm because we need to take the skid parts into consideration.

If a centrifugal pump is fixed on the skid, the effective length should be calculated in this way:

1. The centrifugal pump is fixed horizontally

When a pump is fixed horizontally, this means it is align with the length direction of the tank, so a pump with 37kw motor can be seen as taking the length of 2.5m, and powers above 45kw should be deducted by 2.8m for other pumps. Besides, if there are two paralleled pumps, the tank length should be deducted by an extra 300mm.

2. The centrifugal pump is fixed vertically

But if the pump is fixed vertically to the direction of tank’s length direction, 37kw motor will be calculated as 1m and 45kw motor (or above) will be treated as 1.3m.

There is also another case we should fully understand, sometimes we will design the mud tank into a inclined type. Generally speaking, power of motor within 37kw should be calculated as 3m³；45kw and 55kw motors should be calculated as 3.5 m³； and 75kw motors should be calculated as 4m³.

The main products of GN Solids Control is Decanter Centrifuge, Shale Shaker, Shaker Screen, Vertical Cuttings Dryer etc.

Related article: How to Change Belt Pulley for Fixed Speed Centrifuge