To purchase a mud system, or even drilling rig, there are some questions people will always ask.
What are you doing to save your cost? What might be your stretage if you are buying a whole rig system?
What our clients have done might help you.

1. Build the mud tank locally if you are far from China.
We need the mud tank storage capacity, so can not put into container; it will double, tripple or four times of the origin mud tank cost if we choose bulk shipment. Also if it is on the deck, and if we did not protected properly. Or if we only considered price, we did not know if the painting was done properly. Hmmm, extra cost comes.
2. Do not only follow price.
Check the factory. Follow the manufacturing process, and the testing.This time we just sent out 4sets 1000gpm mud system to Middle East, the client have 4 sets 750hp drilling rig, and fabracte mud tanks locally.

Middle East is of the most important market for GN who has established business relation with many loyal customers by providing the qualified produces and excellent after-sales services including the first time training and commissioning as well as the in time troubling shooting and on site repairing.
The Oman client start cooperation with GN Solids Control since 2012, after the successful feedback of the first projects, GN and the Oman Company got into cooperation smoothly again for another bigger projects which amounts to over $50,000.

The each system contains 2 GNZS703E-HB shale shaker, 1ea GNWS-2S desander, 1ea GNWS-12N desilter, 1ea decanter centrifuge, desander, desilter, centrifuge coming with feeding pumps; then there is dual jet mud mixing system.
As the suggestion from the start, you may wondering why GN can help you save your cost. We are improving our quality upto US or EU standards.
We do not quote higher price for spare parts, though it seems a good trick to do so.
Do not mind to find out all small details we have done to find out why the products deserve the price.

As we all know, China in Africa has largely been couched in government rhetoric and clouded by stereotypes. On 29 Oct., China unveiled the details of its 4th batch of aid worth some 82 million U.S. dollars to help African countrie's fight against the ebola virus. Obsolutely not only politicions, neither another batch of aids. More and more business connection is happening. As one of the leading solids control & drilling waste management supplier in China, now more than 30 units decanter centrifuges operating in Africa in 2014.

If you are interested, pls check the video here from Youtube: https://www.youtube.com/watch?v=DG3ys2kMN1Y
OIL is always big resource in Africa, drilling work is one of the most important activity, Then here comes the environment protection, solids control & drilling waste mangement, not only for recoverying the useful drilling fluid, this is one important factor to encourage people to do this though, also to protect where people live.
This time, our after sales team comes back from western africa, after did commissioning & training for 3 rig sites. Nearly all of them using the most popular decanter centrifuge GNLW363 series, which is similar as DE1000 from Derrick, or Swaco 518 series.
One of the rig site using 2sets GNLW363 centrifuge, one set is fixed speed decanter centrifuge, with 3200rpm high speed when delivery, also 2200rpm/2500rpm/2700rpm as option; the other variable speed centrifuge with VFD control panel. With the PLC VFD control panel, the customer can change the speed easily from 0 to 3200rpm continuously.

Another rig site, is using centrifuge with flocculant unit for dewatering, if we require higher standard, sometimes it might not be enough to only use mechanical separation, polymer, coagulant powder, or whatever the chemical is, chemical powder is get more and more important in the rig site, and in the need of drilling waste management.
GN Solids Control our selves also packing the flocculant unit with a reliable partner. Doing our best to supply customer with a one stop solution.

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.

As a lot of client now need "Clean Water", then chemicals finally upto the show. With a reliable partner, now GN is now also supplying the flocculant unit and coagulant unit, with our centrifuge, to give client a better solution.

The Auto-Flocculant 6000 activity unit can be housed in an exceedingly 20ft normal instrumentation and represents a standard compact system for treating and applying compound solutions. Also can be put into 40ft container with a GNLW series centrifuge. Due to the integrated control system, the preparation and dosing process may take place automatically. An optional feature provides the possibility of referring to a solids dependent dosing mechanism. Based on the data obtained from measuring both volume flow rate and suspension density, the polymer solution is injected into the process in an amount proportionate to the respective solid matter. Such a system will positively exclude unwanted over- and/or underdosing.

The Auto-Flocculant 6000 activity unit is supplied with a liquid compound unit for making certain the automated and continuous preparation of a homogeneously mixed focused compound answer with precise concentration parameters in an exceedingly two-chamber method (product quantity: 3000 l/h) a powder/liquid compound unit for making certain the automated and continuous preparation of a homogeneously mixed focused compound answer with precise concentration parameters in an exceedingly three-chamber method (product quantity: 6000 l/h) a programmable logic controller with bit screen panel for automatic operation flow meters and pressure sensors 2 dosing pumps for transporting the premixed flocculant to the injection purpose.

Two chamber or three chamber, inside container, or outside standing on a skid, can be customized as required.
Also the programme of PLC controlling the system, have two options, one is by timer, another is by water flow. After involve in more and more projects, we will be more professional on all this. Keep tune.