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Tag Archives: centrifugal pump

25 Sets Submersible slurry pump shipped to India

Submersible slurry pump of DC solids control is widely used in many industries or applications. Recent days, DC Solid control shipped 25 sets submersible slurry pump to India used for drilling field.

submersible pump

The submersible slurry pump can be used for fluids transfer with big particles. It is single stage and single suction slurry pump. The pump shell and impeller no bearing, no shaft seal, which can transport great medium of solids particles.

slurry pump

Submersible Slurry Pump have a very simple structure design to ensure maximum performance, minimum energy consumption, long operating life and minimum maintenance. Many different designs can suit various transportation needs in process application of grinding circuits, hydrocyclone feed and slurry transfer.

Please contact DC Solid control for more detail or you have any demand. Trust you’ll get best price with high quality items

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 ).

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.

centrifugalpump

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.

Submersible slurry pump seller

A submersible slurry pump is a device which has a hermetically sealed motor closely coupled to the pump body. The whole assembly is submerged in the fluid to be pumped.

Slurry Pump is the cantilever pump structure of single stage and single suction, with the bearing housing, supporting, intermediate pipe connecting the pump hydraulic components, the water is discharged out from the drain pipe parts, pump impeller is for semi- shrouded with the agitating vane on the vane extended.

submersible pump

The submersible pumps operates in a vertical position. Although their constructional and operational features underwent a continuous evolution over the years, their basic operational principle remained the same. Produced liquids, after being subjected to great centrifugal forces caused by the high rotational speed of the impeller, lose their kinetic energy in the diffuser where a conversion of kinetic to pressure energy takes place. This is the main operational mechanism of radial and mixed flow pumps.

The pump shaft is connected to the liquid/gas separator or the protector by a mechanical coupling at the bottom of the pump. Well fluids enters the pump through an intake screen and is lifted by the pumps. Other parts include the radial bearings ( bushings ) distributed along the length of the shaft providing radial support to the pump shaft turning at a high rotational speed.

A special pump in solid control system

There are many pumps for deliver drilling fluid from a solids control equipment to another in the solids control system. A submersible slurry pump is a kind of drain pump that is heavy and robust to a certain degree than the centrifugal pump. It is used to perform applications that are abrasive and tough.

Submersible slurry pump is with structure of vertical single stage and single suction system overhung centrifugal pump, it is made of abrasion-resistant alloy, it can convey medium with high concentration particle. There is no bearing and Gland Seal between impeller and pump body, so the slurry pump is maintenance-free and heat-resistant, the slurry pump is the ideal centrifugal pump for solids control system.

slurrry pump2

The motor of submersible pump uses a drive shaft which turns an impeller, generating velocity to create the pressure needed to discharge unwanted water. Water is sucked up through the bottom of the pump and redirected into the sewer, a septic tank or simply outdoors away from the home. This is the main function of all sump pumps, submersible pumps use the slightly modified method of being underwater pump.

Submersible pumps are found in many applications. Single stage pumps are used for drainage, sewage pumping, general industrial pumping and slurry pumping. They are also popular with pond filters. Other uses for submersible pumps include sewage treatment plants, seawater handling, fire fighting (since it is flame retardant cable), water well and deep well drilling, offshore drilling rigs, artificial lifts, mine dewatering, and irrigation systems.

Centrifugal Pump’s Impeller Designs and Casing Functions

centrifugal pumps

An oilfield solids control system needs many centrifugal pumps to sit on or in mud tanks. Hydraulic performance of a centrifugal pump determines its working efficiency. Two basic components of a centrifugal pump that are related to hydraulic performance are the impeller and casing.

There are three basic impeller designs:
. a closed impeller that has a shroud (rotating wall) on both the front and the back of the impeller,
. a semi-open impeller that has a shroud on one side and is closely fitted to the stationary wall of the casing on the other side, and
. an open impeller that may or may not have part of a shroud on one side and is closely fitted to the casing wall on the other side.

As fluid approaches the pump suction, it is assumed to have very little to no rotational velocity. When fluid enters rotating passages of the impeller, it begins to spin at the rotating velocity of the impeller. Fluid is forced outward from the center of the impeller, and its rotating velocity increases in direct proportion to the increasing impeller diameter. It should be noted that head produced by a centrifugal pump is a function of fluid velocity and is not dependent (normally) on the fluid being pumped. For example, a pump that will produce 100 feet of head on water (8.34 lb/gal) will also produce 100 feet of head on gasoline (6.33 lb/gal).

The function of the pump casing is to
1. direct fluid into the eye of the impeller through the suction inlet,
2. minimize fluid recirculation from impeller discharge to impeller suction, and
3. capture fluid discharge from the impeller in the case volute to most efficiently utilize work performed by the impeller and direct fluid away from the impeller.

The impeller performs useful work and increases the head of the fluid. The casing consumes part of the work imparted to the fluid and creates head losses due to friction, eddies, and other flow characteristics. A good casing design will minimize the losses, as opposed to a bad casing design. However, no casing design will increase pump head above what exists at the discharge of the impeller. Typically a centrifugal pump casing is designed so that the suction flange is one or two pipe sizes larger than the discharge flange. This is done to manage velocity of the fluid as it approaches the impeller inlet and also to minimize friction losses ahead of the pump. Excessive losses on the suction side of a pump can cause severe and rapid damage to the pump impeller and casing.

The design principle of DC Solid control

Slurry Pump is a kind of vertical pump to transport the solid and liquid mixture which contain a certain concentration, and widely used in coal, aluminium industry, mining, electric power, chemical industry and ect.

DC Solid control have the advanced and mature technology of design the slurry pump. Now let me introduce you our design philosophy.

Slurry Pump1. High efficiency and save energy. Pump power consumption is big occupy 25% of the total power consumption. Compared with traditional slurry, it adopts two phase flow theory to design the slurry pump can improve the efficiency about 5% -10% with the obvious economic benefit.

2. Wear-resistant and save materials. It use the two phase flow theory to design the hydraulic line and greatly match with the medium operation locus to reduce the impacting abrasion. Meanwhile, choose the good wear resistant material can reduce the erosive wear of solid particles to the pump body.

3. The strong through capacity. The pumping medium always obtain the bigger solid particles to prevent blocking, the the design of throat size, tongue clearance, and impeller inlet and outlet flow section area all should consider the largest size of transportation particles.

4. Reliability principle. Considering the installation, operation, maintenance, convenience and operation safety.

You are welcome to contact with us to get more detailed infos, we will supply cost-effective Submersible slurry pump and satisfactory pre-sale, sale and after-sale technical services.

Detailed maintenance of Centrifugal Pump

The working environment of centrifugal pump is bad, need to deliver the drilling fluid for a long time, so we need to maintain it constantly. The following is the detailed maintenance of centrifugal pump.

1  Impeller: It must be renewed if serious cavitation (in particular the main vanes) and excessive damage.

2  Shaft: Repair and maintain or renew it if the runout is over 0.05mm, the location of lip seal had been seriously bruised and the surface of shaft had been damaged.

3  Shaft sleeve: Please renew it if rough surface and serious damage.

4  Lip Seal: The dismantled lip seal must be changed.

5  Ball Bearing: For the bearing which is too wearing, and too tight, loose or with noise when operating, sure to renew it (Note: The new bearing box is unpacked only when renewing and it must be the same type and size as original one).

6  All the parts and particularly the rotating ring of mechanical seal, ‘0’ sealing groove, thread, sealing face, bearing and its lubricating location must be carefully cleaned. Also polish the rough lecation with sifts gauze.

7  When assembling the inboard bearing, the two bearings should be back to back, sure to buckle the lock washer after screwing the locknut and the locking force is 346N.M.

8  A thin layer of antifriction should be smeared on the shaft before fitting the shaft sleeve.

9  The clearance between the back of impeller and protecting plate is 0.6mm.

10  The locking force of each bolt & nut is 195N.M.

11  The packing gland cannot be screwed too tight and keep the liquid leaking drop by drop, or the packing will be burned down when the pump operating.

12  The assembling can be proceeded as the opposite sequence and pump shaft should smoothly rotate after assembling.

 

Solve common fault of using centrifugal pump

Two centrifugal pumps connected in parallel on the same solids control equipment. This is the most often occurred situation in drilling fluid solids control arrangement. If the pressure head is 30m, the flow of hopper nozzle is 25L/s, install two centrifugal pumps in parallel can get a pump with pressure head of 30m, the flow is still 25L/s. The result of two pumps parallel operation is:

1 In fact only have one pump flow.

2 Almost only have one pump delivery pressure.

3 Compared with one pump, the wear is reduced if using two pumps.

4 The power consumption is increased, if one pump be a good status, it can complete most or entire work, and maybe pumping by another pump reversely.

If one pump can’t reach the required pressure head, we should not add another pump abreast. We should check whether the pump be a good working state, if the pump has already be a good working state, but not yet reach the required pressure head, we need to change bigger impeller. After choosing bigger pump or impeller, the motor power is also required larger, and the flow of centrifugal pump will be increased. Therefore, before installing the bigger impeller, we should check whether the motor has enough power, if has already reach the required pressure head, but still need larger flow, then need to replace the equipment to use larger handling capacity equipment or add hydrocyclone cones.

 

Supply DCSB series Centrifugal Pump

The drilling fluid centrifugal pump has a very important role in solids control system, mainly used in extracting the drilling fluid which has viscosity and has solid particles, and it is the power source of desander, desilter and jet mud mixer.

DCSB series centrifugal pump is our factory according to the construction situation to manufacture. The pump flow passage components are made of modern metal wear-resistant material, with strong resistance to wear and cavitation performance, particularly suitable for pumping silty sand and long distance transport sediment, light weight, dismantling convenient, high efficiency and energy saving. Suitable for transporting drilling fluid.

Features of DCSB series Centrifugal Pump:

1 Centrifugal pump impeller type is half open, the quantity of blade is less, blade radial is small, blade width is large, blade inlet angle is big, outlet angle is small. Blade line font is logarithmic spiral line, in order to confirm its inhaled, good abrasion resistance, the efficiency is higher than the circular arc line blade of 6% – 10%.

2 Seal form using the latest mechanical seal oil seal and new type of oil contamination asbestos packing ring seal that integrated shaft seal. Pump shaft seal using packing seal.

3 Centrifugal pump has some advantages: low pressure, large displacement, good inhaled, high efficiency and stable running, maintenance and adjustment is simple and convenient, leak amount is very little, service life is long, can widely meet the requirement of users.

Any interest or question please contact DC Machinery freely.

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