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Category Archives: Centrifugal Pump

China top quality sand pump producer- DC Machinery

Sand pump is an very important equipment for a mud cleaning system. SB series drilling mud centrifugal pump can be designed from 3×2 to 8×6. Selecting pump is according to flow rate demand. Furthermore, the flow rate is related with motor power, head, electric system, the impeller size.

centrifugal pump

The Sand pump adopts the axial suction structure, horizontal or vertical structure, composed of a motor, a pump seat, a pump shell, an impeller etc., using shear coupling (horizontal pump) or plum coupling (vertical) connection, mechanical or combined sealing structure, the main vice impeller combination.

The sand pumps are applicable to deliver corrosive drilling fluid (with suspended particulates) or other liquid media under similar work condition, and are optional pumps for de-sander, de-silter and mixing hoppers as well as perfect perfusion pumps of mud pumps.

sand pump
We have more than 80 models of SB 6*8, SB 5*6, SB 4*5, SB 3*4 and SB 2*3 with motors ramming from 4KW to 75KW.  The sand pumps have two structures of direct connection and belt transmission which are suitable for power grids of 50Hz and 60Hz. They also have metric and British systems and clockwise and anticlockwise directions.


Screw pump to be as the feeding pump for centrifuge delivery

DC screw pump can be working for feeding decanter centrifuge. And can also feeding clean water for flushing use. DC is a hydraulic screw pump manufacturer and can supply screw pump according by customs’ requirement.

screw pump

The screw pump is an ideal mud pump to feed drilling fluids for decanter centrifuge since the fluids may flow along with the shaft with a very slow inner flow speed, which will not change the pump’s capacity, but will keep the pressure steady so that no vertex or agitation will be produced. Besides, the screw pump can also be used in the drilling waste management for wet mud and cutting transportation.

The screw pump is of compact structure, small volume, easy maintenance. Rotor and stator are wear parts of this pump, which are convenient to replace.

If you want know more about feeding pump, please contact DC office.

DC Machinery shipped solid control equipment to India at the end of Feb

At the end of the Feb, DC solid control shipped a set of mud cleaning system to indiae. This ordered equipment will be shipped as 3 batches and all of them will be shipped at the last day of Feb.

The client has a very good knowledge on solids control equipment, also knows very well about China manufactures for this kind of equipment. They visited many manufactures in China, seeing is believing, after the comparison on the factory capability and fabrication processing machine, finally, they chose DC as their supplier.

mud equipment

This order is mainly consisting of vacuum degasser, slurry pump and jet mud mixer.

The vacuum degasser DCZCQ240 is can wipe off the invaded gas from drilling mud quickly, restore drilling mud proportion, keep mud viscosity performance and improve the quality of drilling fluid. We also can provide ZCQ270, ZCQ300 and ZCQ360 vacuum degasser

solid control system

The slurry pump is mainly feed for DC High speed decanter centrifuge. The slurry pump is with structure of vertical single stage and single suction overhung centrifugal pump. The impeller is semi-open type, equipped with paddle wheel in the impeller suction side extension place. The length of pump inserts submerged is 800mm~2500mm, and can be equipped with suction pipe if needed.

The jet mux mixer in simple structure and easy manipulation which can satisfy the drilling fluid’s need on weighting and compounding from 1500m to 9000m depth. DC’s jet mud mixer can be customized to be double jet mud mixer based on customer’s need.

Why are mud pumps (used in drilling rigs) reciprocating instead of a centrifugal pump?

As we all know that mud ( Drilling fluid) is used to prevent formation fluids from entering into the well bore, keeping the drill bit cool and clean during drilling, carrying out drill cuttings, and suspending the drill cuttings while drilling is paused and when the drilling assembly is brought in and out of the hole. The drilling fluid which is used job is selected job specifically to avoid formation damage and to limit corrosion. The viscosity of this mud changes from formation to formation, so there is quite a lot of fluctuation of viscosity.

mud pump

So if we will be using the centrifugal pump we have to use different pump for different mud ( different viscosity ), as for these pumps with change in viscosity :
1. The brake horsepower requirement will increase.
2. Reduction in the head which is produced by pump.
3. Some reduction in capacity will occur with moderate and high viscosities.
4. The pump’s efficiency will decrease.

centrifugal pump

This all happens because frictional losses within the pump increases with increase in viscosity.

Whereas if we will be using a Positive displacement ( reciprocating pump ), with increase in viscosity, flow rate also increases because the higher viscosity liquids will fill the clearances of the pump, causing higher volumetric efficiency apart from this, reciprocating pump can also operate at lower speeds and impart low amounts of shear energy to the fluid compared to a centrifugal pump ( shear energy is quite an important factor if we are handling a shear sensitive fluid ).

Top quality drilling fluid centrifugal pump of DC companys

As we know, centrifugal pump is also called sand pump which plays an important role for drilling muds transfer in solid control system. Such as, the drillings from mud tank to shale shaker, the pump is the connection as bridge.

DC produce the centrifugal pump with reliability 、 heat-resistant 、large flow 、long life 、low- energy consumption 、easy maintenance and other advantages.

sand pump

Centrifugal pumps are commonly used to handle medium between -20℃~105℃, and even higher temperature medium of provided with cooling measures in case of needed. They are suitable for chemical, petroleum, metallurgy, electric power, papermaking, foodstuff, pharmaceuticals, synthetic, etc. industry. They are featured by wide range of performance, high efficiency, superior standardization, easy maintenance, etc.

DC also offers its pumps mounted on skid packages horizontal electric, vertical electric, close coupled electric, horizontal diesel, overhead belt and side belt, and wired with starters, if so desired.

DC’s superiority centrifugal pump for sale

Centrifugal pump is a kind of centrifugal pump, it uses axial inhalation structure, the flow passage components is antifriction cast iron. The impeller is open and adapts transport high viscosity drilling fluid. The pump body, impeller and backplate use the material of non-metallic wear resistant. Besides, the high pressure water is injected to the lubrication part of pump shaft to prevent desnader enter into glide parts.

centrifugal pump

Characteristics and advantages of centrifugal pump:

1. Impeller of centrifugal is open type and number of blades are less, the radial of impeller is less, the impeller is width, inlet mouth angle is big, out mouth is small. The linear of impeller is logarithmic spiral to verify the imbedibility and abrasive resistance is good.
2. The worm of centrifugal uses the spiral and the section of worm is rectangle. Centrifugal worm and impeller use the method of area ratio to design, it can control laryngeal flow speed and has high efficiency wear resistance.
3.Sealing form uses the newest mechanical seal and the new type comprehensive shaft seal. Pump shaft seal uses packing seal and the padding room is added the high pressure pure water to clean, it ensure the pump can operate regularly.
4.Centrifugal pump has the advantages of low pressure, big displacement, high efficiency, operation steady and safety, maintenance and adjustment is easy and convenient and service life is long, it also can meet the requirements of customers’.
5. Centrifugal pump accords the movement rules of two phases and distortion rules and the optimize working condition parameter of experiment grade to decide.
6. The main components are all wear resistant ductile iron and resin sand to manufacture, the using life is long and nice exterior.
7. The surface of centrifugal pump all use sand blasting treatment, the paint uses the anticorrosive epoxy zinc rich paint and high pressure airless process construction.
8. All bolts, nuts, flat gaskets and split cotter pin must be galvanized but don’t have chromeplate and nickel plating.

DC production of centrifugal pump is for oil field drilling fluid new supporting pump . The impeller is specially designed to have a wider flow pass and smooth vanes , with larger flow area and smooth fluid pass , making the pump efficiency and energy saving , 10 % higher than similar products .

Widely used in many fields of DC advanced design slurry pumps

Submersible slurry pump is used in drilling fluid solids control system to pump the thick liquid, thick oil, oil residue, dirty fluid, mud and fluid which contains clay sand slag and corrosive fluid.

slurry pump

Our field-proven slurry pumps can transport any type of slurry and are used frequently in the following industries:

1. Pipeline transportation (ores, potash, coal, oil sand and minerals, etc.)
2. Mining processing industry (autoclave and digester feeding and tailing disposal)
3. Underground mining (mine dewatering and backfill and hydraulic ore hoisting)
4. Oil industry (oil sand refining and tailing disposal)
5. Power industry (ash and coal slurry and long distance transport).

submersible pumps

DC Machinery according to the international advanced solid liquid two phase flow theory and optimized principle to design the submersible slurry pump. We offer different product variants with pressure ratings of up to 30 MPa and flow rates of up to 1 400 m³/h to meet any project requirement or slurry application. Our heavy duty slurry pumps can be supplied in several designs:

1. Piston or piston diaphragm
„2. Duplex or triplex
3. Single- or double-acting
4. With electric motors and VFD configuration

For further information read our Slurry Pumps brochure or directly contact us to get more professional knowledge about slurry pumps.

Screw pump/Mono pump China supplier

Drilling mud screw pump is a kind of centrifugal pump that feed for decanter centrifuge in solid control system. but sometimes users choose submersible slurry pump in the solids control system as centrifuge’s feeding pump.

centrifugal pump

Advantages of DC Screw pumps 

China supplier of DC Solid control Screw pump is available for option with complete stainless steel body. It can drive by coupler, or adjust the speed by using variable speed motor, Triangle V-belt, gear box, etc. DCG series screw pump with less accessories, compact structure, small volume, easy maintenance, rotor and stator are wear parts of this pump, it is convenient to replace. The stator is made of elastomeric material, so it has particular advantages than other pump to transfer the fluids of high viscosity and hard suspended particles included.

screw pump

Application field of screw pump

Screw pump Principal fields of application Food industry, Texil mill, Paper-making, Petro-industry, Chemical industry, Ship building, Build industry, Nuclear industry, Metallurgical and mine etc. It is designed according to Chinese standard.

DC Machinery supplies good quality solids control screw pump with best price, welcome to contact us and get the best solution for your work!

How to solve the problems of centrifugal pumps

When the centrifugal pump impeller inlet liquid pressure below the delivery temperature of liquid under pressure gasification, the liquid begin to gasify. Meanwhile, the other gas is soluble in the fluid maybe overflow. At the same time, forming large small bubbles in fluid, this phenomenon is called cavitation.

The small bubbles is produced by gasified and dissolving overflow flow together in impeller passage way, when the pressure is increasing gradually, the bubbles will be broken by surrounding fluid pressure, then it will be to condensation. When the bubbles are broken and be to condensation. The gas area volume is decrease gradually and form into cavity in the passage way.


The impacting to centrifugal pump

Causing noise and vibration

The cavitation makes the pump produce noise and it is bad to the pump. when the bubbles are broken, the machine may vibrate. In this condition, pump can’t work on.

Causing working parameter is decreased

When the cavitation phenomenon is serious, the large bubbles in impeller will block the impeller passage way, the continuity of fluids will be damaged, the flow, head and efficiency of pump will be decrease, this condition pump can’t work on.

Causing pump impeller be damaged

When pump cause the cavitation, because of the impact of mechanical corrosion and chemical corrosion, the impeller will be damaged, the impeller can be corroded through when cavitation is serious.

The method of prevent cavitation

The performance of medium, delivery temperature, the length and diameter of intake pipeline, the number of parts of intake pipeline and the installation height of centrifugal pump are all influence the cavitation. In order to preventing cavatation, it demands decrease the delivery temperature, currently install, the design of pump and intake pipeline and installation height are all have strict requirements.

Unique features of drilling fluid screw pump

A screw pump is a positive-displacement (PD) pump that use one or several screws to move fluids or solids along the screw(s) axis. This pump has a strong adaptability to medium,smooth flow,small pressure fluctuation and high suction capacity.With unique design of rotor and stator, low rate of pump internal flow and more stable pressure.

screw pump

Features & Benefits of Screw Pump

1. The pump shaft is made of stainless steel and even the whole pump is possible to be made of it.
2. The stator is made of elastomeric material, so it gives the pump a more competitive advantage than the other pump to transfer the fluids of high viscosity and fluids with hard suspended particles content.
3.Screw and machine body are made of stainless steel material which is corrosion resistant and has a long service life.
4. The pump is of compact structure, small volume, easy maintenance. Rotor and stator, wearing parts of this pump, are convenient to replace.

Screw pump can be working for feeding decanter centrifuge. And can also feeding clean water for flushing use. Besides, screw pump for pumping neutral or corrosive liquids, uncontaminated or abrasive liquids, liquids containing gases or which tend to froth, and liquids of high or low viscosity, including liquids containing fibrous and solid material.

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