Month: October 2014

GN Mud tanks are widely used in solids control area, although the functions might seems quite resemble which are to storage the muds or wastes for different separation steps, all of these tanks play a vital important role in solids control.
Today we would like to share some info on how to design a GN mud tank roughly in a fast way.
To design a GN mud tank, we need to know the way that our customer going to transport in their region or the ship method to their country. Usually there are different land transportation limits in various countries, so these limitations are the first numbers we need to discuss with our customers. But all of these limitations are must be within a container.
So the second thing need to consider is the sea transport way. Will the solids equipment be put into container? Will the equipment be designed to the same size as the container? Or will the equipment be shipped in bulk? Depend on different shipping methods, the tank can be designed into different limited sizes.

If the tank is put into a container, the largest width is 2250 mm (including sand cleaning doors and lifting lugs); If the tank is designed as a standard container, than the largest width is 2588 mm; Or if the tank is a large capacity tank, the largest width is 2950 mm.
For all these tanks, we usually designed them with integer number, from 4m to 12m. It’s better the length is not beyond 13.5 m. If the tank (length is 6m) is made into 20 feet container, the length should be 6058mm; while for tank (length is 12m) is made into a 40 feet container, the length is 12192mm. Skid-mounted tanks should plus 250mm in both ends of the tank (which is 500mm in total), the final length is with 0.5m.
More details, we’ll share with you in our next blog.

Solids Control equipment combined with dewatering unit for processing mud

As we all known, GN Solids Control Company are specialize in providing turnkey solutions for customers on solids control and waste management systems. It’s important to provide customers with best quality equipments such as shale shakers, mud cleaners, decanter centrifuges and cuttings dryer etc. Some other auxiliary equipments are also quite important when it comes to show a perfect function for the whole system.
Today we would like to give you a brief introduction on GN mud degasser. Mud degasser is also called poor boy degasser sometimes.

GN mud degasser is a useful equipment to eliminate the gas from drilling fluids before the fluids is sent to solids control systems. Although the mud degasser is not always used in the drilling process, it’s quite important when there is much gas in the drilling fluids. Because too much gas can destroy the solids control equipment. For the gas separated from the drilling fluids, some of it might be SO2 which is very harmful for people’s health. So usually there is one flare igniter connected with the mud degasser, the harmful gases can be burnt in a quite far place.

The mechanical structure of GN mud degasser is very simple. Just take GNZYQ 1000A as an example, the tank diameter is 1000mm. Drilling fluids first run along with the inlet pipe which is 4 inch, then it will hit several baffle plates. Due to the large pressure, the collision force is big enough to separate the gas from drilling muds and run out from the outlet pipe which is 10 inch to a flare igniter or to some other faraway place.
For the after treated drilling fluids, it is sent to solids control system for further separation. Sometimes, there will be a vacuum degasser right in the back of shale shaker. The vacuum degasser is used to eliminate gases in small diameters. Different situations might need to use different equipments, so if you have any further questions, welcome to contact us directly.

GN Two Decanter Centrifuges Used in Nigeria

GN Solids Control has working on solids control and waste management fields for years. Every year, GN Solids Control produces about one hundred and fifty decanter centrifuges and four hundreds shale shakers as well as the other solids control equipments. Most of these equipments are sent to abroad due to the large market. 

Recently, GN has manufactured two decanter centrifuges for clients in Nigeria. These two decanter centrifuges are composed one whole system for drilling fluids separation.

As we all known, when two decanter centrifuges are using together, the first one is usually treating larger capacity drilling fluids, and the second one is used for separating finer solids. Although the decanter centrifuge is mainly used to separate solids with diameter larger than five microns, two decanter centrifuges have different separation function when working together. 

Regarding to this system, GN proposed to use two sets of GNLW 363. The bowl diameter of this decanter centrifuge is 14 inch and the length of this decanter centrifuge is 50 inch. Treating capacity can reach to 200 GPM. But for rotating speed of this decanter centrifuges, they are not the same. To save money for customers, the first centrifuge can be fixed speed at 3200 r/m. And the second one can be rotating from 0 to 3200 r/m. 

When the drilling fluids with mud changes, we can adjust the rotating speed of the second centrifuges to satisfy the treating demands. However, it would be better to choose two sets of adjustable speed decanter centrifuges. When controlled by PLC, all the operation work will become much easier for workers.

Here these two decanter centrifuges are both fed by screw pump. GN use famous brand screw pumps which is a very effective feeding pumps, when this pumps is working, it can avoid agitating the drilling fluids. For any details, welcome to email to thomas@gnsolidcontrol.com

Several factors to affect the working capacity of decanter centrifuge
Now GN Solids Control has different types of decanter centrifuges, the treating capacity are ranging from 40 GPM to 484 GPM. As we all know, decanter centrifuge are designed and manufactured for separate the drilling solids which diameter is mainly below 10 microns. But for the common people, we might do not know why the treating capacity can be varies a lot.
There are some parameters, such as the diameter of the bowl, the length of the bowl, the position of the liquid outlet, the position of the discharge port and the rotating speed of the bowl as well as the rotating speed of the inner propeller. Among these parameters, the bowl’s diameter and the bowl’s length are two main factors we usually talked a lot.
It is not difficult to understand when a bowl with a larger diameter and a larger length, it has much more working room space to treat the drilling fluids which means it must have a larger capacity.

Sometimes, we will access one bowl by the ration of length and diameter, which we named f (f=Length/ Diameter) here. Since we usually design the bowl diameter from 9 inch to 22 inch, and the length from 26 inch to 71 inch, so it’s quite common the f is ranging from 3 to 8.
Some designers believe the decanter centrifuge should working at a high speed and the f must be very large. Considering the fierce vibration of the whole decanter centrifuge, the speed cannot be over 4500 r/m. At the speed of 4500 r/m the inner parts (such as inlet pipe) will broken in a short period. According to the former experiences, rotating speed at 3800 r/m (with bowl diameter in 22 inch and bowl length in 71 inch) can satisfy the most separation demands.
For finer separation, GN recommends to use two decanter centrifuges. Besides, GN has mini decanter centrifuge especially for diamond drilling. Any details, welcome to email to thomas@gnsolidcontrol.com

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