GN Shaker Screen is a subcompany of GN solids control which is API Q1 certified company.
GN Solids Centrifuge and Skid Delivered to A USA Client
GN Solids Control has been working on manufacturing the best decanter centrifuges for many years. GN Solids Control centrifuges are widely used in oil and gas area for solids control and drilling waste management.
Now GN Solids Control manufacture 350 sets to 500 sets decanter centrifuges every year, over 70% are using globally. As one of the branch company of GN Solids Control, GN Solids America has been providing decanter centrifuges for many years, some other solids and liquid separation equipment such as shale shaker, mud cleaner, destiler and desander etc are also provided.
GN Solids Control decanter centrifuges are largely using in oil and gas area, but these years in the other slurry treating area, GN Solids Control centrifuge also play well.
Several weeks ago, GN Solids America delivered one 14 inch size bowl centrifuge to one USA customer. This set centrifuge will be used to treat the drilling mud or drilling slurry.
GN Solids Control has 5 size decanter centrifuges include 9inch baby centrifuge (mainly using in diamond drilling, core drilling or mining slurry treating), 14inch centrifuge, 18 inch centrifuge and 22inch centrifuge (among which the 14inch centrifuge are the most popular one in solids control and waste management area although the other sizes are also used), as well as GN largest size decanter centrifuge 30inch rotating bowl (mainly using in TBM drilling area).
The one we provide is one 14inch size GN centrifuge, model GNLW363, equipped with one VFD control box. GN centrifuge rotating bowl is made of duplex stainless steel by centrifugal casting, and inside the screw conveyor is fixed with hundred pieces of tungsten carbide tiles which can be replaced when broken. 
GN Solids also provided one stand to equip this decanter centrifuge, and one feeding pump is fixed on the skid to pump slurry into GN centrifuge. GN Solids Control only uses high quality products, such as the pump we are using is Germany brand Netzsch. While the two main bearing is SKF bearing.
Why GN Screen is the best choice to replace OEM one?
GN Solids Control is only devoted to provide consistent quality shaker screens to suit different site usage, no matter it's oil and gas or HDD etc. We DO not want to cut our manufacturing cost by using some cheap raw materials.
1. Screen Frame:
As you know the composite screen is embedded by one metal screen supporting frame. Many screen vendors are using single layer and less metal bars, which are OK in some worksites usage but will also broke shortly in the other sites.
2. Composite Materials:
There are 3 popular ways to get those composite or plastic for all composite screen manufacturers: a. Recycle and reuse second hand plastic; b. Buy chemicals and manufacture by himself; c. Buy high quality prilling plastic.
GN only uses the last one which is high quality prilling plastic, obvious this is the most expensive one, but the composite frame is also last longest. 
3. Wire Cloth:
Different screen manufactures are buying from different wire cloth vendors, top rank, second rank and third rank... GN Solids only use top rank wire cloth which is the same vendor as Derrick and Mi-Swaco.
Different wire cloth to from the API no., GN only uses 304 for the bottom layer, but use 316L for the middle and top layer.
4. Injecting Moulding Machine
GN has its own injecting moulding machine. Quality can be controlled strictly.
Consistent quality is very important for us, we will never manufacture screens that work well in one site and fail in the other site. Quality is one thing; the API cut point is another important thing to consider.
As far as we know, GN is the only China Screen manufacturer has all the API no. that tested by a USA third party in order to conforms with API RP 13C. You may double check with the other China screen vendors whether they have a full series API test report issued by a third party. 
Besides, GN Screen are 4 side tensioned, it takes time to do this (actually manufacturing efficiency is pretty low) and also waste some screen cloth during manufacturing but it's totally worth. We can send you a tension testing tool next time so you may check whether the other screen vendors are using any pretention method.
GN Oil Sludge Treating System
As one of the famous solids control and waste management equipment manufacturers and turn-key solution provider, GN Solids Control has provided hundreds of customized solids and liquid separating systems, one of the most popular systems is GN Oil Sludge Treating System.
Last year, GN Oil Sludge Treating Systems were sold to USA, Kuwait, Qatar and Uganda etc.
In order for everyone has a better understanding, we’d like to pick up some of the questions our customers asked before:
On the Mixing Tank that feeds the second decanter centrifuge, we will want to add another 3 inch connection to the tank bottom to supply our Reactor. Another example, on the V-Bottom Tanks with screw conveyor, I will want to add an overflow weir to skim oil. This means that we will want to add some our Innovation custom design modifications. After we place the order, I would like to visit you in Houston and we would spend a day together marking up your standard design drawings with our needed modifications.
The piping connections between the mixing tanks and pumps, and pumps to decanters, are those hard steel pipes or are they flexible heavy duty hoses? Most of them are flexible hoses, not sure if they are heavy duty; few of them are hard steel pipes.
The Vacuum Transfer Pump is very impressive but 17 cubic meters per minute high pressure air consumption is too much and too expensive for this small system design. I am thinking of adding another Wilden T4 AODD pump. I don't like that the Wilden T4 pump only passes < 5mm solids. Do you have a better suggestion for the first pump to feed the Pre-Mixing Tank?
As you mentioned the solids content is around 30%, which is very hard to transfer by the other types pumps, only vacuum pump can transfer the high density and large viscosity oil sludge. However, screw conveyor might be used, but you will use one excavator to fill into a catching box of the conveyor. Obviously it's not the best option. 
We will add the 20 foot Electrical Distribution Center to our system. I assume all piping connections on the various tanks will include valves? Do you use butterfly or knife gate valves? Yes, we use butterfly valves. If you have particular demands, we can modify our system. GN is especially good at providing tailored oil sludge treating system.
