Month: December 2017

In the solids control processing and waste management work systems, the screw conveyor are widely used in transporting main solid part. Screw conveyor also called auger. The out look of screw conveyor like long boxes connect together and with impeller in it, with rotation of the impeller, the materials can be transported to collecting tank/box.

Theauger could be positioned in with a slope, and within a certain slope angle, the materials could be transported to enough height. for practice, like in a generalized solids control system, the screw conveyor are used in different places as below:

1. in WBM (water based mud) solids control system, the screw conveyor is also can be used to collect the drilling cuttings discharged from the desander and desilter,also the solids control centrifuge,and another auger is used to transport cutting to the solidification unit, normally is the final treatment for the drilling cuttings.
2. when auger is always in slope situation, which is used in receiving the solids cuttings from shaker and feed it tovertical cuttings dryer.to reduce liquid part
3. one set of screw conveyor used to collect solids cuttings from the shale shaker, and transport the80% dry cutting to tank or continue screw conveyor
4. screw conveyor are also used to collect the drilling cuttings discharged sometime by the vertical cuttings dryer and waste managementhigh speed decanter centrifugeand deliver them to the solidification unit.

For screw conveyor,the solids part must be high enough,or most liquid part will go to bottom of unit,for this situation,we may consider sludge vacuum transfer pump

GN Solids Control is the manufacturer for solids control and waste management systems and solution in China. also GN solids control focus on provides complete closed loop of zero discharge solutions to oil and gas drilling industry. Such solution includes: the solids control systems for drilling rigs ranging from 500 HP(horse power) work over rig to 2000 HP deep oil and gas drilling rigs, the drilling cuttings waste management system for both WBM(water based mud) and OBM(oil based mud), solidification unit for final treatment of drilling cuttings, for drilling fluids, GN has dewatering unit and dewatering centrifuges of high speed. And GNSC series screw conveyors are greatly used in those GN systems.

More question,please click our website

GN solids control supply vacuum pump,have some advice for the pump user

Vacuum pump is a new way for transfer material like sludge or slurry,compare with auger(screw conveyor),the vacuum transfer pump can save more space and make transfer work more clean

The pump is without any rotation items. With special structure design and powerful suction capability, it can be used at tough environmental for solids transfer

The vacuum pump is not work alone,it need air compressor to feed the pump

Normally vacuum pump will have minimum request for air compressor, like 17mm³/min(600CFM) at 550Kpa-795Kpa(80-114PSI),it means advice user prepare air compressor can fit this air demand and pressure,or higher,then the vacuum pump can work stable

The transfer/discharge distance is not fixed,it will change based on different material,transfer material should have enough flowability,can’t make pipe block and poor flowability means shorder distance vacuum can transfer,normally the manufacture will test transfer distance by clean water,and mark MDD(maximum discharge distance),higher capacity air compressor can make MDD longer

 

The compressor will include 5 parts,then to feed pump:

1.Main compressor

2.Air tank

3.Pre-filter

4.Refrigerated

5.Micro-filter

Some manufacture will supply main compressor signally,so,please mention to get all 5 part,then the vacuum pump can running

The vacuum pump can transfer waste mud/solids,drilling fluid,or hazardous waste recovery,for oil sludge in tank bottom clean,even sand course,fine,conventional and frac sand is supported

More use way of vacuum pump,please contact GN solids control

GN solids control can supply equipment for TBM drilling by mud system

There are two main methods : earth pressure balanced (EPB) and slurry type shield machine. Selection of shield method depends on surface conditions ,ground conditions, dimensions of the tunnel section,tunnel alignment , boring distanceand construction period. Both are closed-face type shield machines, meaning the “head” part of machine is “closed” and separated from the rear part of machine. The “head” has a working/running chamber filled with soil or slurry between the cutting face and bulkhead to stabilize the cutting face under soil pressure . The EPB type shield machine turns the excavated soil into mud pressure and holds it under soil pressure to stabilize the cutting surface. It have system to cut the soil, mixing system to mix the excavated soil into mud pressure, soil discharge solution system to discharge the soil and control system to keep the soil pressure uniform. Therefore, EPB may not be applicable for the rocky soil that is hard to turn the excavated soil into slurry or sludge. It can be used at ground predominated by clayer soil. The slurry kind shield machine, on the other way, uses the external pressurized slurry to stabilize the cutting face, similar to bored piles or diaphragm walls using bentonite to contain the trench wall. The slurry is circulated to transport the excavated soil by fluid conveyance. Besides having excavation system, the slurry type shield machine has slurry feed and discharge equipment to circulate and pressurize slurry and slurry processing equipment on the ground to adjust the slurry properties.

A tunnel boring machine (TBM), also known as a “mole”, is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata. They may also be used for microtunneling. They can bore through anything from hard rock to sand. Tunnel diameters can range from a metre (done with micro-TBMs) to 19.25 metres to date. Tunnels of less than a metre or so in diameter are typically done using trenchless construction methods or horizontal directional drilling rather than TBMs.

Tunnel boring machines are used as an alternative to drilling and blasting (D&B) methods in rock and conventional “hand mining” in soil. TBMs have the advantages of limiting the disturbance to the surrounding ground and producing a smooth tunnel wall. This significantly reduces the cost of lining the tunnel, and makes them suitable to use in heavily urbanized areas. The major disadvantage is the upfront cost. TBMs are expensive to construct, and can be difficult to transport. The longer the tunnel, the less the relative cost of tunnel boring machines versus drill and blast methods. This is because tunneling with TBMs is much more efficient and results in shortened completion times, assuming they operate successfully.

With TBM,sometime ,will use drilling fluid to keep press,GN solids control have centrifuge and other solids control equipment to join mud management system

In soft ground, there are three main types of TBMs: Earth Pressure Balance Machines (EPB), Slurry Shield (SS) and open-face type. Both types of closed machines operate like Single Shield TBMs, using thrust cylinders to advance forward by pushing off against concrete segments. Earth Pressure Balance Machines are used in soft ground with less than 7 bar of pressure. The cutter head does not use disc cutters only, but instead a combination of tungsten carbide cutting bits, carbide disc cutters, drag picks and/or hard rock disc cutters. The EPB gets its name because it uses the excavated material to balance the pressure at the tunnel face. Pressure is maintained in the cutterhead by controlling the rate of extraction of spoil through the Archimedes screw and the advance rate. Additives such as bentonite, polymers and foam can be injected ahead of the face to increase the stability of the ground. Additives can also be injected in the cutterhead/extraction screw to ensure that the spoil remains sufficiently cohesive to form a plug in the Archimedes screw to maintain pressure in the cutterhead and restrict water flowing through.

For solids control equipment with TBM,GN solids control can supply package system solution like shale shaker/centrifuge/vertical cutting dryer/other equipment to recycle drilling fluid,and treat waste ,please check more detail at GN solids control