Month: November 2016

The GN Big Bowl Centrifuge

Have met some stubborn engineers which only prefer 14in popular size decanter centrifuges, and never mind the qty it will be used, also some others who only prefer the big bowl one, and no matter how big it is. Before it was a problem, back to the time GN only offer 14in and 18in, as it was popular. Nowadays, since we have upgraded our manufacturing system, and also keep learning and optimizing our managing system. We are now able to supply not only 22in, also 30in centrifuges, while the inside screw size is bigger than 14in, neverthless the length / diameter ratio, most of them can upto 1:4 now.
big bowl decanter centrifuge
The GN 30 inch (760mm) bowl diameter decanter centrifuge is a big bowl centrifuge. GN 30inch centrifuge is with bowl length and diameter ration of 4.2:1. This bowl size allows client to handle big volume fluids with one single unit. Because of GN unique design for the screw and bowl, the GN 30 inch decanter centrifuge is design for best performance in Tunnel Boring Project Mud Cleaning, Dredging Slurry Separation, and Municipal Sewage Sludge in Purification Plants, Industry Waste Water Treatment.
According some feedback regarding GNLW553, we have upgrade the new generation to GNLW554, to make sure it have higher flow rate, and better fluid / solid result. With the modenized machine, it is not so obvious increasing the cost. This Fully Variable Speed VFD controlled unit is built using the most reliable and robust electrical components, with either ABB or SIEMENS brand variable frequency drive units. Electronic load sensing and feed pump control permit automatic optimization of the feed rate, bowl speed, and differential conveyor speed.
This may not be related to this title, but the GN 9in baby centrfuge is also have higher ratio.
Keep tune on GN big bowl centrifuge, if need more information, pls let us know.

Meeting with GN People in the Exhibition You Know, Make a Schedule Before it’s Late

GN Solids Control have joined many exhibitions in 2016, and met with clients from all over the world, if you are not one of them yet. Here is somethign you will not miss in future.
1. OSEA Singapore
Time: 29 Nov. ~2 Dec.
Location: Marina Bay Sands Singapore
GN booth: 1G5-01
Equipment: GNLW363D decanter centrifuge
2. Petro Tech 2016
Time: 4~7 Dec
Location: New Delhi India
Equipment: GNLW223D
Then you have probably already missed CIPPE, OTC, ADIPEC, Trenchless Asia, Iran Oil Show, Russia oil show etc.
A few questions you may want the answer before you come to meet with us:
1) What is NEW
Using our equipment, or not yet, you may want to know what we have done, the R&D. Well if you have kept tune with GN news, or following my linkedin, then you may have already noted all this.
This year, GN have released decanter centrifuges for all other industries, food, waste oil, farming etc.
Now GN can manufactur most of the popular screens with composite material frame, which tested in Russia, operating time is more than 500hours.
2) Who is your client, who have used your euqipment.
If you have download our presentation, you may noticed we list some of them.
Baker Hughes, the case study can be found here.
Baroid, Scomi, EMEC, COSL
3) What can you do in my projects
We will let you know what we normally did, with your comments, we will find the solution for you.
Follow George from Linkedin, get more recent updates.

Centrifuge Operation Optimization

If you have already knew how to choose a decanter centrifuge, and already done some test, found out some valuable data with sample testing, it is successfully handled by the decanter centrifuge, and well knowing the size, expected performance, right scale, solid & liquid properties seems good too. Then also have some professional operator to run it. All seems perfect, then with a running centrifuge, is there anything you need to take care?
Below info. maybe a hint.
-Feed Rate
-Bowl Speed
-Pool Depth
-Pool Length
-Conveyor /Bowl Differential Speed
-Feed Concentration
-Feed Temperature
Find some good centrifuges here: http://gnsolidsaustralia.com/drilling-fluids/gnlw363fhd-full-hydraulic-decanter-centrifuge
Decanter Centrifuge
-Feed Rate
This adjustment is probably the easiest to carryout and does not involve stopping the centrifuge. The effect of feed rate on performance can be generalised as follows.
The higher the feed rate the less residence time the liquid has in the bowl hence the harder to
settle out possible ultra fines. Conversely the lower the feed rate the longer the liquor residence time and hence the easier to obtain clear liquors and in some instances 100% recovery of solids.
-Bowl Speed
Can be changed automatically with VFD drive, or manually with changing the belt / pulley, to change the G force.
Higher speed normally means better result, less moisture, more fine solids separated.
Whilst higher power consumption, more general wear and tear too.
-Pool Depth
This is not able to adjust while operating, normally rotate all the weir plates. Consequently the deeper pool depth, the shorter drying beach, then the wetter the discharged solids.
-Pool Length
The effective pool length can be adjusted by feeding in one of usually mo feed compartments. By feeding in the feed compartment nearest to the liquor discharge end of the bowl, the effective pool length is shortened hence the least residence time for the liquid. Respectively the longer the pool the longer the residence time
-Conveyor /Bowl Differential Speed
The conveyor to bowl differential (Delta RPM) is altered by changing the bowl speed due ro the
gearbox. The gearbox itself can be changed for a different ratio, though an expensive change
once in the field.
The lower delta rpm, the longer residence time, and the dryer cake, but also less capacity.
Too low delta rpm may cause overloading the conveyor with solids
-Feed Concentration
High concentration will cause poor separation.
-Feed Temperature
The hotter feed, the less viscous, and the better result.
Generally for many many years, the principles and philosophy of centrifuge operation is not changed, the subject of centrifuge operation is complexed, and also simple, with combination of application experience, testing, or even designning, you will have your own invaluable knowledge about material, desired separation results etc.
Still GN Solids Control team is ready to be even more helpful.

Choose a Decanter Centrifuge in Purpose

This is a how to article and discuss how to find a proper decanter centrifuge, basically two things need to be considered: economic expectations and technical requirements. It is essential to clearly define the process, and pass this information to the centrifuge supplier at initial briefings.
The prospective user should also clearly define exactly what the centrifugal process is required to achieve. Fluid charactor before and after treatement, density, viscosity, solids content etc.
The whole process in your plan, before and after centrifuge. Does the material require clarification, classifi cation, degritting, thickening, dewateri.rg, washing or separating and repulping, and is the process a solidliquid, liquid-liquid or a three phase liquid-liquid-so1id duty?
decanter centrifuge
Once the process is clearly defined, it is easier to identify variables such as the percentage of suspended solids, volumetric slurry throughput, solids throughput and the required product consistency at discharge.
Other consideration like G force, pH, for different applications.
Particle size, distribution arrd shape are also important factors when determining separation capabilities ald whether or not a batch or continuous centrifuge is the best option. Generally, materials which are predominaltly 45 microns and above and relatively incompactable are suitable for separation by filtration equipment, whereas finer or compactable materials lend themselves more to separation by sedimentation.
Decanter centrifuge are used to process unweighted and weighted, water-based and oil-based drilling fluids (muds). Mechanical energy is utilized to increase the gravitational force exerted on solids that are present in the mud system.oilfield Decanting Centrifuge are able to apply over 3,000 G-forces on the liquid/solids mixture, which separates the heavier solids from the lighter solids. Additionally, high G-forces separate fine solids from liquid.
Mechanical separation of solids from the mud system through the use of a decanter centrifuge is a highly-effective means of maintaining proper mud weight and viscosity. When used in conjunction with other Solids control equipment, decanting centrifuge enable users to maintain the mud properties within the prescribed range as per the drilling program. Typically,oilfield decanting centrifuge is the final processing units in the arrangement of solids control equipment.
GN Solids Control manufactures different type of decanter centrifuges, from 9in to 72in, and widely used in oil gas industry, now moving into other industries also.
Keep tune and find out more updated decanter centrifuges from GN. http://gnsolidsaustralia.com/drilling-fluids/gnlw363fhd-full-hydraulic-decanter-centrifuge