centrifugal mud pump drilling in stock

A wide variety of centrifugal mud pump for drilling rig options are available to you, such as 1 year, not available and 3 years.You can also choose from new, centrifugal mud pump for drilling rig,as well as from energy & mining, construction works , and machinery repair shops centrifugal mud pump for drilling rig, and whether centrifugal mud pump for drilling rig is 1.5 years, 6 months, or unavailable.

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Centrifugal Pumps - Unused Surplus Flowserve 3x8-7 stage DMX centrifugal pump. CF3MN case material • 7-stage • 4” 600# RF suction flange • 3” 900# RF discharge flange • Mechanica... More Info

Centrifugal Pumps - Unused Surplus Flowserve 4HPX13A, API 610, OH2 pump. 952 gpm, 448 tdh, 3575 rpm with a unused surplus Siemens 200 HP electric motor with following features: 3575 rpm, 46... More Info

Centrifugal Pumps - Unused Surplus Flowserve 6HED16DS, API 610, OH2 pump. 1850 gpm, 990 tdh, 3575 rpm with a unused surplus Reliance 600 HP electric motor with following features: 3579 rpm,... More Info

Centrifugal Pumps - Unused Surplus Flowserve 6HED25DS 10 x 6 single stage API-610 centrifugal pump, 10" 600lb suction, 6" 600lb discharge, CA6NM case material. Tag reads 1327 gpm, 430 tdh, 1... More Info

Centrifugal Pumps - Unused Surplus Flowserve 6HPX23A, API 610, OH2 pump. 2917 gpm, 480 tdh, 1785 rpm with a unused surplus Teco Westinghouse 600 HP electric motor with following features: ... More Info

Centrifugal Pumps - UNUSED SURPLUS FLOWSERVE 6UZDL25 CENTRIFUGAL PUMPS WITH MOTORS. TAG READS 2,879.48 GPM, 945.86 HEAD FEET, SP. GRAVITY 0.97, HORSEPOWER 921, 1783 RPM, CUSTOMER ORDER NUMBE... More Info

Centrifugal Pumps - For Sale: Qty (1) Unused Surplus Flowserve 6x11 DMX-A 7 stage centrifugal pump. CA6NMB case material, 11.18" CA6NM impeller. Tag reads 1800 GPM, 2762 TDH, 3560 RPM. More Info

Centrifugal Pumps - Unused Surplus Flowserve 8HDX27B single stage centrifugal pump, tag reads 1794 rpm, 3412 gpm, 649 tdh, S.G .968, C6 API 610 / 12 Chrome case material. API 610 BB2 Class P... More Info

Centrifugal Pumps - Used Flowserve VTC 42 KXH Vertical Turbine Pump Only. Size 42-3 stage, CA6NM bowls, 316 stainless column and head. 27"- 9" long. Tag reads 20693 gpm, 406 tdh, 710 rpm. More Info

Centrifugal Pumps - Gardner Denver PAH equipped with 5-inch pistons and liners, powered by Caterpillar C10 diesel engine with Allison automatic transmission. With clutch manifold and centrif... More Info

Centrifugal Pumps - Unused Surplus Goulds 3700 1.5x3-9N, API 610, OH2 pump with the following features: • 316SS case material • 1-stage • 316SS impellers • 3” 300# RF suction flang... More Info

Centrifugal Pumps - Unused Surplus Goulds 3700 6x8-13A, API 610, OH2 pump with the following features: 316SS case material, 1-stage, 316SS impellers, 8” 300# RF suction flange, 6” ... More Info

Centrifugal Pumps - Goulds LF3196 Centrifugal Pump, Pumps & Parts, Used Goulds LF3196 Centrifugal Pump, Impeller Diameter 7.875, 37 GPM, 3600 RPM, 312" TDH Head, 1x1.50-8 National Constructi... More Info

Centrifugal Pumps - Grundfos CR1017, Pumps & Parts, New Grundfos CR10-17 Centrifugal Pump 638" TDH Head, 53 GPM, 3444 RPM, 60 Hz, Type CR10-17 A-GJ-A-E-HQQE, Driven by Baldor 15hp Electric M... More Info

Centrifugal Pumps - Grundfos CR16 30, Pumps & Parts, Used Grundfos CR16-30 U-G-A-AUUEV Vertical Centrifugal Pump, Model B33000063VP1 0112 US432, 84 Gallons/Minute, 169FT-TDH, 3450 RPM, 7.5HP... More Info

Centrifugal Pumps - Grundfos CR16 30, Pumps & Parts, Used Grundfos CR16-30 U-G-A-AUUEV Vertical Centrifugal Pump, Model B 33000063VP1 0112 US 336, 84 Gallons/Minute, 169FT-TD, 3450 RPM, 7.5H... More Info

Centrifugal Pumps - Halco 3 x 4 Centrifugal Pump, Pumps & Parts, Used Halco 3 x 4 Centrifugal Pump, Size 3 x 4 x 13, Model # 1780, Steel Volute, Takes Packing , More Info

Centrifugal Pumps - Ingersol Rand 2.5 CNTA-4 centrifugal pump with the following features: Carbon steel case material, 4 stages, 9.375"" Bronze Impellers, 4" 300# suction flange, 2.5" 300# d... More Info

Centrifugal Pumps - Used KSB HGC 5/7 Centrifugal Pumps. Chrome Case Material, 7 Stage, 8" 300# RF Suction, 6" 1500# Discharge. Tag Reads 1992 GPM, 2082 PSI, 3582 RPM. More Info

During the 1950’s the Mission” 1780 type “W” pumps were introduced to replace duplex pumps while creating the first low pressure mud system. The use of a high quality concentric type centrifugal pump allowed abrasive fluids to be mixed and transferred while reducing initial and maintenance costs for the drilling industry. The low-pressure mud system with Mission 1 780 Type “W” centrifugal pumps became the industry standard.

As well depths increased so did the need for heavier mud weights. When the mud weight began exceeding 14 ppg the need for a pump that could withstand greater horsepower loads arose. During the 1970’s Mission organized a design team that engineered the Mission Magnum. The Magnum was designed to have the same footprint, flange locations, and drive shaft diameter as the 1780 “W”. This allowed a 1780 to be replaced by a Magnum without any skid modifications. The Magnums were originally engineered with a 2-1/2″ shaft (3″ between the bearings), double row bearings with an engineered life of over 2 years at 200 HP, larger impellers and heavier frames. The Magnum allowed drilling contractors to upgrade their centrifugal pumps and mix heavier fluids.

The National Oilwell Varco” Mission centrifugal pump line has proven to be the best centrifugal design for handling abrasive mud. This pump line offers a broad selection of innovative features for a variety of routine, demanding, abrasive and corrosive applications. These pumps are designed for a wide range of flow rates, from a few gallons per minute to thousands of gallons per minute.

Each pump contains the finest materials, engineering and craftsmanship available in the industry. Described are like features of these pump lines and unique features are described on the following pages.

National Oilwell Varco utilizes unique design features developed for slurries. Three major differences from most pump designs include the concentric casing, wider impellers and increased re-circulation areas. Each feature contributes to reducing wear when handling abrasive fluids.

All of the pumps feature a concentric casing. This casing averages 37% thicker than conventional pump casings, and up to 50% thicker for the larger, mud pumping models. They are pressure rated at 1 .5 times the flange rating and are designed with a 1 /8″ erosion allowance. The concentric style casing has proven to offer the greatest pump life and reduced downtime. The walls of a concentric style casing are an equal distance from the impeller throughout the impeller circumference, which results in a smooth flow pattern. A volute style casing has a cutwater point that disturbs the fluid flow pattern creating an eddy. The concentric casing eliminates vibration, turbulence and aeration that is caused by the cutwater point in conventional volute pumps. It also reduces the high bearing loads and shaft deflection even at near shutoff flows.

The shaft is much larger in diameter than conventional pump shafts for heavy-duty performance, minimum deflection and increased operating life of the seal or packing. With a 2-1/2″ diameter at the seal area and 3″ diameter between the bearings these pumps can be direct connected or belt driven.

This rig features a Mission 4-by-5 centrifugal pump. Courtesy of Higgins Rig Co.Returning to the water well industry when I joined Schramm Inc. last year, I knew that expanding my mud pump knowledge was necessary to represent the company"s mud rotary drill line properly. One item new to me was the centrifugal mud pump. What was this pump that a number of drillers were using? I had been trained that a piston pump was the only pump of any ability.

As I traveled and questioned drillers, I found that opinions of the centrifugal pumps varied. "Best pump ever built," "What a piece of junk" and "Can"t drill more than 200 feet with a centrifugal" were typical of varying responses. Because different opinions had confused the issue, I concluded my discussions and restarted my education with a call to a centrifugal pump manufacturer. After that conversation, I went back to the field to continue my investigation.

For the past eight months, I have held many discussions and conducted field visits to understand the centrifugal pump. As a result, my factual investigation has clearly proved that the centrifugal pump has a place in mud rotary drilling. The fact also is clear that many drilling contractors do not understand the correct operational use of the pump. Following are the results of my work in the field.

High up-hole velocity - High pump flow (gpm) moves cuttings fast. This works well with lower viscosity muds - reducing mud expense, mixing time and creating shorter settling times.

Able to run a desander - The centrifugal"s high volume enables a desander to be operated off the pump discharge while drilling without adding a dedicated desander pump.

6. Sticky clays will stall a centrifugal pump"s flow. Be prepared to reduce your bit load in these conditions and increase your rpm if conditions allow. Yes, clays can be drilled with a centrifugal pump.

7. Centrifugal pumps cannot pump muds over 9.5 lbs./gal. Centrifugal pumps work best with a 9.0 lbs./gal. mud weight or less. High flow rate move cuttings, not heavy mud.

The goal of this article has been to increase awareness of the value of the centrifugal pump and its growing use. Although the centrifugal pump is not flawless, once its different operating techniques are understood, drilling programs are being enhanced with the use of this pump.

If you wish to learn more, please talk directly to centrifugal pump users. Feel free to call me at 314-909-8077 for a centrifugal pump user list. These drillers will gladly share their centrifugal pump experiences.

Continental Emsco Drilling Products, Inc., which consisted of Emsco drilling machinery and Wilson mobile rigs, was purchased by National-Oilwell, Inc on July 7, 1999. To our knowledge, no pumps have been manufactured and sold under the Emsco brand name since National-Oilwell acquired them.

Fairbanks Morse pumps are currently manufactured in Kansas City, Kansas. Fairbanks Morse is a division of Pentair ever since August, 1997 when Pentair purchased the General Signal Pump Group.

Gaso pumps are manufactured by National Oilwell Varco. Gaso was acquired as "Wheatley Gaso" by National-Oilwell in the year 2000. At the time, Wheatley Gaso was owned by Halliburton.

Skytop Brewster pumps are no longer available as new pumps. Skytop Brewster(Cnsld Gold), a unit of Hansen PLC"s Consolidated Gold Fields subsidiary, was acquired while in bankruptcy by National-Oilwell, Inc. in November, 1999.

The revolutionary design of the MAGNUM I provides supreme-duty performance in all types of fluid pumping operations. Although it offers greater capacity and higher heads, the MAGNUM I remains the competitive pump of choice for aggressive applications.

The Magnum has an open impeller design that contains wide-tipped vanes and a more tangential circumference of the suction allowing the pump to create a smoother flow pattern when handling abrasive fluids. The Magnum is available in Magnachrome™, hard iron, stainless steel, and aluminum bronze fluid ends. The pumps can be unitized with electric motors, diesel engines, and hydraulic motors (horizontal, vertical, or close-coupled configuration).

According to the different working conditions, Mission centrifugal pumps can be used as Frac discharge pump, Frac suction pump, Oil drilling centrifugal pump, electric centrifugal transfer pump, Skid mounted mixing pump, Transfer pump, Trash pump, Grinding pump, Circulating mud pump, Centrifugal sludge pump, Drilling fluid centrifugal pump, Horizontal directional drilling pump, Denver pump, Filling pump, Feeding pump, etc

The drilling industry has roots dating back to the Han Dynasty in China. Improvements in rig power and equipment design have allowed for many advances in the way crude oil and natural gas are extracted from the ground. Diesel/electric oil drilling rigs can now drill wells more than 4 miles in depth. Drilling fluid, also called drilling mud, is used to help transfer the dirt or drill cuttings from the action of the drilling bit back to the surface for disposal. Drill cuttings can vary in shape and size depending on the formation or design of the drill bit used in the process.

Watch the video below to see how the EDDY Pump outperforms traditional pumps when it comes to high solids and high viscosity materials commonly found on oil rigs.

Solids control equipment including shakers, hydro-cyclones, and centrifuges are utilized to clean the drill cuttings from the drilling fluid, which then allows it to be reused and recirculated. The circuit includes the mixing of the drilling fluid in the rig tanks.

The drilling fluid is prepared to control fluid loss to the formation by the addition of chemicals or mineral agents. Commercial barite or other weighting agents are added to control the hydrostatic pressure exuded on the bottom of the well which controls formation pressures preventing fluid or gas intrusion into the wellbore.

The fluid is charged into high-pressure mud pumps which pump the drilling mud down the drill string and out through the bit nozzles cleaning the hole and lubricating the drill bit so the bit can cut efficiently through the formation. The bit is cooled by the fluid and moves up the space between the pipe and the hole which is called the annulus. The fluid imparts a thin, tough layer on the inside of the hole to protect against fluid loss which can cause differential sticking.

The fluid rises through the blowout preventers and down the flowline to the shale shakers. Shale shakers are equipped with fine screens that separate drill cutting particles as fine as 50-74 microns. Table salt is around 100 microns, so these are fine cuttings that are deposited into the half-round or cuttings catch tank. The drilling fluid is further cleaned with the hydro-cyclones and centrifuges and is pumped back to the mixing area of the mud tanks where the process repeats.

The drill cuttings contain a layer of drilling fluid on the surface of the cuttings. As the size of the drill cuttings gets smaller the surface area expands exponentially which can cause rheological property problems with the fluid. The fluid will dehydrate and may become too thick or viscous to pump so solids control and dilution are important to the entire drilling process.

One of the most expensive and troubling issues with drilling operations is the handling, processing, and circulation of drilling mud along with disposing of the unwanted drill cuttings. The drilling cuttings deposited in the half round tank and are typically removed with an excavator that must move the contents of the waste bin or roll-off box. The excavators are usually rented for this duty and the equipment charges can range from $200-300/day. Add in the cost for the day and night manpower and the real cost for a single excavator can be as much as $1800/day.

Offshore drilling rigs follow a similar process in which the mud is loaded into empty drums and held on the oil platform. When a certain number of filled drums is met, the drums are then loaded onto barges or vessels which take the drilling mud to the shore to unload and dispose of.

Oil field drilling operations produce a tremendous volume of drill cuttings that need both removal and management. In most cases, the site managers also need to separate the cuttings from the drilling fluids so they can reuse the fluids. Storing the cuttings provides a free source of stable fill material for finished wells, while other companies choose to send them off to specialty landfills. Regardless of the final destination or use for the cuttings, drilling and dredging operations must have the right high solids slurry pumps to move them for transport, storage, or on-site processing. Exploring the differences in the various drilling fluids, cutting complications, and processing options will reveal why the EDDY Pump is the best fit for the job.

The Eddy Pump is designed to move slurry with solid content as high as 70-80 % depending on the material. This is an ideal application for pumping drill cuttings. Drill cuttings from the primary shakers are typically 50% solids and 50% liquids. The Eddy Pump moves these fluids efficiently and because of the large volute chamber and the design of the geometric rotor, there is very little wear on the pump, ensuring long life and greatly reduced maintenance cost for the lifetime of the pump.

plumbed to sweep the bottom of the collection tank and the pump is recessed into a sump allowing for a relatively clean tank when the solids are removed. The Eddy Pump is sized to load a roll-off box in 10-12 minutes. The benefit is cuttings handling is quicker, easier, safer, and allows for pre-planning loading where the labor of the solids control technician is not monopolized by loading cuttings. Here, in the below image, we’re loading 4 waste roll-off bins which will allow the safe removal of cuttings without fear of the half-round catch tank running over.

Mud cleaning systems such as mud shaker pumps and bentonite slurry pumps move the material over screens and through dryers and centrifuges to retrieve even the finest bits of stone and silt. However, the pump operators must still get the raw slurry to the drill cuttings treatment area with a power main pump. Slurry pumps designed around the power of an Eddy current offer the best performance for transferring cuttings throughout a treatment system.

Options vary depending on whether the company plans to handle drill cuttings treatment on-site or transport the materials to a remote landfill or processing facility. If the plan is to deposit the cuttings in a landfill or a long-term storage container, it’s best to invest in a pump capable of depositing the material directly into transport vehicles. Most dredging operations rely on multiple expensive vacuum trucks, secondary pumps, and extra pieces of equipment.

Using an EDDY Pump will allow a project to eliminate the need for excavators/operators to load drill cuttings, substantially lowering both labor and heavy equipment costs. The EDDY Pump also allows a company to eliminate vacuum trucks once used for cleaning the mud system for displacing fluids. Since the pump transfers muds of all types at constant pressure and velocity throughout a system of practically any size, there’s little need for extra equipment for manual transfer or clean up on the dredge site.

The EDDY Pump can fill up a truck in only 10 minutes (compared to an hour) by using a mechanical means such as an excavator. For this reason, most companies can afford one piece of equipment that can replace half a dozen other units.

This application for the Eddy Pump has the potential to revolutionize the drilling industry. Moving the excavator out of the “back yard” (the area behind the rig from the living quarters) will make cuttings handling a breeze. Trucking can be easier scheduled during daylight hours saving on overtime and incidences of fatigued driving. Rig-site forklifts can move the roll-off boxes out of the staging area and into the pump loading area. The operator can save money on excavators rental, damages, and keep the technician operating the solids control equipment.

The EDDY Pump is ideal for drilling mud pump applications and can be connected directly onto the drilling rigs to pump the drilling mud at distances over a mile for disposal. This eliminates the need for costly vacuum trucks and also the manpower needed to mechanically move the drilling mud. The reasons why the EDDY Pump is capable of moving the drilling mud is due to the hydrodynamic principle that the pump creates, which is similar to the EDDY current of a tornado. This tornado motion allows for the higher viscosity and specific gravity pumping ability. This along with the large tolerance between the volute and the rotor allows for large objects like rock cuttings to pass through the pump without obstruction. The large tolerance of the EDDY Pump also enables the pump to last many times longer than centrifugal pumps without the need for extended downtime or replacement parts. The EDDY Pump is the lowest total life cycle pump on the market.

Within the petroleum industry centrifugal pumps are necessary in order to process fluids especially hydrocarbons. Another important application within the petroleum industry is in the mud circuit on a drilling rig. On drilling rigs, mud which consists mainly of water and bentonite as well as of several different additives depending on many different factors is used. The heart of the mud circuit is the mud pump which is in general a high pressure piston pump. It provides the major part of head to overcome the system’s resistance. The mud is pumped through a piping system to the derrick and through the standpipe to a definite high. Now through the kelly hose via the gooseneck into the upper kelly cock. It flows through the Kelly and the lower kelly cock into the drill string down the borehole. At its end, the mud leaves the drilling collars through the drilling bit.

1. Select a pump to handle the highest anticipated flow. Select an impellersize to provide sufficient discharge head to overcome friction in the lines,lift the fluid as required, and have sufficient head remaining to operatethe equipment being fed.

Initially this guideline suggested that the pump flange size be selected to provide the highest anticipated flow, even though the flange size has nothing to do with the flow rate. Most pump curves are listed in terms of the flange sizes. The size of the pump impeller housing increases as the flange size increases. An impeller rotating at constant speed will create a constant head independent of the size of the housing or the flanges. An impeller that fits inside a 2×3, 3×4, 4×5, or 5×6 pump will produce the same head in each pump if it is rotated at the same speed. Because the housing of a pump with a 2-inch and 3-inch flange is smaller, the internal friction at a high flow rate will be greater than a 56 pump. This means that the capacity of the various pump sizes will be indicated by their flange sizes. The committee decided to only indicate that the pump should be selected to handle the highest anticipated flow rate, instead of indicating that the flange size is commonly used to specify pump size.

2.Install the centrifugal pump with a flooded suction that is sumped so thatsufficient submergence is available to prevent vortexing or air-locking.Foot valves are not needed or recommended with flooded suctions.

A small influx of air into the suction of a centrifugal pump can create cavitation problems and diminished flow. As the air enters the chamber with the impeller, it tends to concentrate in the center of the impeller because of the centripetal acceleration of the drilling fluid.

The liquid continues to move through the pump. The air does not always continue to the impeller tip, but tends to remain in the center of the impeller. This bubble of air forms a barrier for the incoming fluid, which diminishes the flow rate into the pump. The air also experiences a significant decrease in pressure—possibly even below atmospheric pressure. This causes implosions of vapor bubbles that can remove metal from the impeller. The pump will sound as if it is pumping gravel. If it continues in this mode for a long period of time, the impeller will be severely damaged.

Flooded suctions tend to eliminate most of the air influx problems but sometimes a small vortex will form in the mud tank. These small vortexes can entrain a significant amount of area. Increasing agitation in the tanks may prevent a coherent cylinder of air from reaching the suction line. Alternatively, a plate can be installed in the tank to interrupt the formation of a vortex.

In some cases, a centrifugal pump is placed on the ground above a pond or buried tank. Foot valves are needed if the centrifugal pump is operated above the liquid level of the suction tank. Foot valves are check valves that prevent the suction line from draining when the pump is turned off. Care must be taken to eliminate tiny air leaks in the suction line because the absolute pressure will be below atmospheric pressure. The pump and suction line should be filled with fluid before the pump motor is started. Centrifugal pumps do not move air very well.

A centrifugal pump suction can only lift fluid a certain height above a liquid level. These heights are determined by observing the NPSH (negative pressure suction head) values listed on the centrifugal pump curves. If the NPSH is exceeded, cavitation can destroy the impeller.

Horizontal pipes will fill with solids until the flow rate reaches 5 ft/sec. Barite in equalizing lines between mud tanks is normally settled until the velocity between the tanks reaches 5 ft/sec. Increasing the diameter of connection lines only causes more barite to settle. Above 10 ft/sec, pressure losses in the pipe become too great. Elbows and swages tend to cause turbulence in the flow stream, which can lead to cavitation.

5. Eliminate manifolding. One suction and one discharge per pump ismost cost effective over time. Do not manifold two pumps on the samesuction line. Do not pump into the same discharge line with two or morepumps.

Flexibility of piping so fluid can be pumped from any tank through any equipment to any other tank has created more problems over the years than just about any other concept. A properly plumbed system should require only one suction and one discharge for each piece of solids-removal equipment. Ignoring this rule allows rig hands the opportunity to open or close the wrong valves. A leaky or incorrectly opened valve can reduce drilled-solids removal efficiency by up to 50%. This translates to an expensive drilling-fluid system. This problem can be eliminated by storing an extra pump and motor. Arrange the centrifugal pumps and motors so that they may be easily replaced. If a pump or motor fails, simply replace the unit. The damaged unit can be replaced during routine maintenance. Two centrifugal pumps in parallel will not double the head available to equipment because a centrifugal pump is a constant head device. For example, visualize a standpipe that is constantly filled with fluid. If two standpipes of approximately the same height are connected, the flow from both pipes will almost equal the flow from one standpipe. If fluid stands lower in one standpipe than the other. fluid will flow from the highest standpipe to the lowest standpipe. This same flow occurs when two pumps are connected in parallel—fluid will flow backward through one of the pumps.

6. Install a pressure gauge between the pump discharge and the first valve.When the valve is closed briefly, the pressure reading may be used fordiagnostic evaluation of the pump performance.

A centrifugal pump uses the smallest amount of power when no fluid is moving through the pump (that is, when the discharge valve is completely closed). If the valve remains closed for longer than 5 minutes, the fluid within the pump will become hot from the impeller agitation. This hot fluid may damage the seals. Closing the valve for a short time allows a good reading of the no-flow head produced by the pump. This reading should be compared with the pump manufacturer’s charts. The diameter of the impeller can then be determined. (A pump may be stamped 5X6X14. This means that it could house a 14-inch impeller but it does not mean that it has a 14-inch impeller. The impeller size is adjusted so the pump will deliver the proper head.) After the pump has been in service for a period of time, the pressure reading will assess the condition of the impeller. This eliminates the need to dismantle the pump for inspection. If the manifold pressure is incorrect, reading the pump no-flow discharge head will assist in troubleshooting.

7.Keep air out of the pump by degassing the mud, having adequate suctionline submergence, and installing baffles to break mixer vortices. Properly sized, baffled, and agitated compartments will not vortexunless the drilling fluid level becomes extremely low.

Centrifugal pumps cannot pump aerated fluid. The air tends to gravitate toward the center of the impeller while the liquid moves toward the outside. This creates an air bubble at the center of the impeller. When the air bubble becomes as large as the suction line diameter, fluid will no longer enter the pump. This is called airlock. Only a small cylinder of air vortexing into the pump is sufficient to prevent the pump form moving liquid. Since the air accumulates over a period of time, a small vortex the size of a pencil is sufficient to eventually shut down a 6×8 pump. Baffles are inexpensive and easily installed in an empty tank. Any vertical surface that disrupts the swirling motion of the fluid in a compartment is usually sufficient to destroy a vortex. Rig pump efficiency can decrease from 99 to 85% efficiency if the drilling fluid content rises to 6% volume. Air in the drilling fluid may be calculated by measuring the pressurized and unpressurized mud weight.

8. Do not restrict the flow to the suction side of the pump. Starving thepump suction causes cavitation and this will rapidly damage the pump.When a pump begins cavitating, small vacuum bubbles adjacent to the impeller surface start imploding. The pump sounds as if it is pumping gravel. The implosions quickly remove metal from the surface to the impeller blade. In a very short period of time, holes will appear in the metal. Important: Do not close a valve on the suction line while the pump is running!

Starving the suction will decrease the output head. If the head, or pressure produced by the pump, is too high, change to a smaller diameter impeller. On a temporary basis, a discharge valve can be partially closed. On a long-term basis, however, considerable valve erosion will occur so a new, properly sized impeller is necessary. Even a large centrifugal pump is not damaged if only 10 to 20 gpm is discharged from the pump. In fact, the lower flow rates will require less horsepower to the motor than pumping fluid at a much higher flow rate.

Centrifugal pumps will pump fluid even if running in reverse. The head produced by the pump will be lower than it should be. The pressure gauge installed between the pump and the first valve will assist with the diagnosis. Usually, switching two wires in the lead-in panel box will correct the rotation.

10.Startup procedure for an electric motor–driven centrifugal pump with avalve on the discharge side between the pump and the equipment beingoperated is to start the pump with the valve just slightly open. Once thepump is up to speed, open the valves slowly to full open. This approachwill reduce the startup load on the electric motor and will reduce theshock loading on equipment such as pressure gauges and hydrocyclones.

An alternative startup procedure is to completely close thedischarge valve before startup and then open the valve slowly immediatelyafter startup to prevent overheating and possible damage to thepump seals.

An electric motor–driven centrifugal pump will immediately try to produce a constant head when it is turned on. If the pump is pumping into an empty line, the flow rate is enormous. Very high flow rates require very high currents to the electric motor. Circuit breakers can stop the pump and avoid motor burnout. Lower horsepower is required if the pump is started with the discharge valve closed.

UDS International designs and manufactures heavy-duty centrifugal mud pump parts and equipment with innovative designs for optimum output and reliability.

Mud pumps are an important part of your drilling, tunneling and/or mining dynamics, helping to maintain drilling mud circulation through your drilling rig column, which improves the efficiency of drilling operations and reduces wear on your equipment.

UDS effective mud pump parts and equipment have the durability to meet the demands of high pressures, a range of ground conditions and are easy to maintain.

Tobee® offers a complete line of centrifugal sand pumps to suit for all kinds of drilling sand pump application. Size ranges from 3x2x13, 4x3x13, 5x4x14, 6x5x11,6x5x14, 8x6x11,8x6x14, 10x8x14, 12x10x23 to 14x12x22b. Bare pumps, matching motors are available from 7.5KW to 90KW, with rotation 800, 1000, 1150,1450, 1750 to 3500 RPM at 50Hz or 60Hz.

The model 10x8x14 and 8x6x14 centrifugal magnum pump used on solid control system over 3000 meter-long drilling rigs, with big viscosity and heavy specific gravity drilling fluid. 8x6x11 centrifugal mud solid control feeding pump applies to under 3000 meter-long drilling rigs, and it also can be used to supply mud to triplex mud pump as a filling pump. 6×5×11 centrifugal pump applies to truck-mounted drilling rigs or pocket drilling rigs. 4x3x13 drilling centrifugal pump is usually used as measuring pump or replenishment pump. 3x2x13 model pump is usually used as clean water pump.

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GN Solids Control last week shipped another batch of centrifugal mud pumps and oilfield centrifuges to an international drilling company. GN Solids Control is a turnkey solids and liquid separation equipment manufacturer who has rich years of experience on design, manufacture the most cost effective solutions.

GN Solids Controlprovides 2 sets 14 inch bowldecanter centrifuge GNLW363CG to this drilling company. Usually when 2 centrifuges are using together, the first one is used to remove solids by volume and the second one is used to remove solids by particles. 2 sets GN centrifuge can be used for high gravity drilling mud or low gravity drilling mud treating, or can be used for barite recovery.

In order to remove fine particles from the drilling mud, GNSolids Controlprovides chemical dosing unit so the solids less than 5 microns can be removed.

Besides these 2 sets GN decanter centrifuges, GN Solids Control also provides 16 sets centrifugal pumps, include 4 sets GNSB4x3C-11J, 6 sets GNSB6x5C-13J and 6 sets GNSB8x6C-14J.

GN madecentrifugal pumps are totally interchangeable with NOV Mission Magnum pump. To protect the centrifugal pump and impeller from weariness, GN Solids Control use hard ductile iron alloy.

GN centrifugal pumps are widely used to feed slurry into desander or desilter, and they can be also used in the jet mud mixing unit, or play as a trip pump.

Besides GN decanter centrifuge, centrifugal pumps, GN Solids Control is able to provide the shale shaker, vacuum pump, shaker screen, cuttings dryer as well as big oil sludge treating system, drilling mud storage plant etc.