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May 29

GN desander and desilter consist of different size hydrocyclones to reach different treating capacity, we usually use 8”, 10”,12” cone as desander cone, and 4” cone as desilter cone. Although we have 3”,5”,6” cone, but usually we did not use it in our equipments , so as 20” cone.

High performance of hydrocyclone

Hydrocyclone is the most attractive device for removing solid particles from liquid . It utilizes the centrifugal force to effect the separation. The separation of solid from liquid depends on the particle size and particle density. Centrifugal force throws the particles out against the wall and they subsequently drop into the outlet hopper. Cyclone consists of vertical cylinder with conical bottom. The inlet point is near the top of the cylindrical portion. The particles separated are collected at the bottom. Our desander can separate 47~76μm particles, and desilter cone can separate 15~47μm particle.

hydrocyclone desander cone
Hydrocyclones are designed for separating solids from liquids and are successfully used in liquid/solids separation, classification, and concentration.they can be defined as fixed wall centrifugal separator devices that separate particles according to density and mass. Unlike other type of centrifugal separators, the liquid mixture rotates within the chamber. Continue reading »

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Apr 14

Recently we are studying microtunneling slurry separation system. This is a new project for GN solids control, but the work principle is similar to the slurry separation system used for other project. Our rich experience of design and manufacture help us a lot in the study.

Definition and History

Microtunneling is a process that uses a remotely controlled Microtunnel Boring Machine (MTBM) combined with the pipe jacking technique to directly install product pipelines underground in a single pass. This process avoids the need to have long stretches of open trench for pipe laying, which causes extreme disruption to the community. In the U.S., microtunneling has been used to install pipe from twelve inches to twelve feet in diameter. Therefore, the definition for microtunneling in the U.S. does not necessarily include size. Microtunneling has evolved in the US to describe a tunneling process where the workforce does not routinely work in the tunnel. Microtunneling is currently the most accurate pipeline installation method. Line and grade tolerances of one inch are the microtunneling industry standard. This can be extremely important when trying to install a new pipeline in an area where a maze of underground utility lines already exists.

Microtunneling was developed by the Japanese in the early 1970’s to replace open sewers in urban areas with underground gravity sewers. The first microtunneling project in the U.S. occurred in south Florida in 1984.This was a 600 foot crossing with 72″ pipe under I 95 and the FEC Railroad. Although originally designed for gravity sewer construction, microtunneling installations include underground crossings of highways, railroads, runways, rivers, and environmentally sensitive areas for a variety of utilities. This process has also been used to install plant intakes and outfalls. Microtunneling is also used in the pipe arch technique of supporting large underground openings with an arch or roof made up of small tunnels

As the name implies, microtunneling is used to construct small tunnels. These small diameter tunnels make it impossible to have an operator in the machine itself. Instead, the microtunnel boring machine or MTBM must be operated remotely. Usually the operator controls the machine from a control room on the surface of the ground. The operator is given constant feedback about the machine’s location, orientation and hydraulic devices via a computer console. Most machines also have video cameras set up to give the operator more information. The operator can then control the MTBM and the jacking frame from the safety of the control room.

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written by GN Desander Desilter \\ tags: , ,

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