We use decanters in waste water treatment plant and the nominal operating points are

* 15 to 20 m3/H

* Input dry solid : 3 to 5 %

* Torque : betwwen 2500 à 4000 KN

* Cone angle : 11 to 16°

* Output DS : 20 to 25 % ( organic sludges with 50 to 65 % of organic matter)

3 VFD for GN VFD Decanter Centrifuge

Ok thanks for the quotations. Can you confir the electric cabinet with VFD ( 3 VFD ) are inluded in the quotations.
GN: Yes it is 3 VFD, one for main drive, one for back drive, one for pump drive. But for your application, as it is environmental fileds, you will use a small pump.

I think a pump with 10HP Nemo pump with max capacity 30 m3/H is enough. Right?
Ok for the 3 VFD , what kind of VFD do you use ( Altivar, ABB, Danfoss,...). If possible we will prefer Altivar or ABB. Electricity is 400 V, 50 HZ
GN: ABB VFD is one of our standard. 400V/50HZ is fine for us.

Torque & Torque Control for GN VFD Decanter Centrifuge

Moreover i need to get the following informations :

* is there any Torque regulation included ( differential automatically adapted to the seeting Tors point )

GN: Our PLC control system has two options torque control or currency control. We can use torque for your application. Perfect we use to operate with torque control or in Manual changing the differential speed to find the right Torque seeting point and then colme back to the Torq mode.
I need to have the maximum Torque of the gear box for the 2 models ( kN.m)

* what is the cône angle of the decanters
* GN: 17 Degree,
* Perfect i was afraid to hae a low cône angle but 17 ° is nice.

GN: The GNLW363BG-VFD centrifuge Max Gear Box Torque is: 3500N.M and the GNLW453-VFD Max Gear Box Torque is 7500 N.M, so we recommend you to use the GNLW453-VFD model for your application and your capacity.

GN VFD Decanter Centrifuge for Waste Water Treatment

Q: Do you have any experience with your decanters on environental fields ?

GN: Our centrifuge main application is oilfield, including drilling mud solids control, and Environmental solutions, also we have a few projects for Dredging Slurry Separation, which is close to your case.
For your application, we will increase the speed from 2800RPM to 3200RPM to allow you control the speed from 0-3200RPM.
RE: Ok to go to 3200 rpm as we have to go around 2200 G-force.

If possible, you can send some samples of your material, one bottle is enough for us to study to check, sometimes we may need to do some more modification one our centrifuge to fit for your material. One of our main centrifuge engineer has ever worked for our centrifuge company, they focus on environmental solutions, he understand what fits for the envrionmental solutions.
Also if your have any Data Sheet of your material, you can send to us, like Viscosity, Solids Size Range, Density etc.

RE: Not easy as the product is organic sludge that involve, but we treat around 500 000 m3 per year of this kind of sludges with centrifuges,.....So we know what kind of centrifuge we need.

Concerning sensors i need to know if you have any temperature bearing sensors and vibration safety sensor as standard .

For the price i need to know if this price include the frame to put the centrifuge at 3 m height with stairs ,plateform for the centrifuge and system to trasfer the solid sludge into the groung or in a skip.

As we use polymer, we need to put in the skid a liquid polymer preparation ( maximum 5 m3/h of diluted polymer to iject at 0,5% concentration)

For the pumps i think you can change it but as if we can treat also bentonite slurry With a 50 m3/h we should have a range between 6 to 50 m3/h

I need also to have the typical noise of the centrifuges near the plant and at 1 m

GN: 1) We will choose the pump model with 50 m³/h capacity and adjustable from 0-50 m³/h.

2) We can install 2 Bearing Temp. Sensor and the Vibration Switch as per customer requirements, this is extra price not include in our quotation.

3) The Single Layer Bowl Cover Box centrifuge is noisy is around 85 ,what noisy will meet your need? We can use the double layer cover box to reduce the noise.

4) Price we quoted to you is only the Centrifuge price with 3 VFD, the Cylinder and Cone Material of our Centrifuge Bowl is Duplex Stainless Steel made by Centrifugal Casting.
Other parts main material is SS316L and screw is protected by Tunsteng Carbide Tiles, as you can see in our brochure.

5) According to what you need, we will update the quotation, and give you the price for the pump and the Telescopic skid in separate price for your option.