Description
We can supply several centrifugal pump models.
In general, 8×6×14, 8×6×11 centrifugal pump is mainly used to provide a certain displacement and pressure of drilling fluid for desander, mud cleaner, mixing pumps and mud pump.
6×5×14,6×5×11 centrifugal pump is mainly used for truck-mounted drilling rig.
4×3×13 centrifugal pumps, known as metering pumps, is always used with metering tank.
3×2×13 centrifugal pumps are mainly used with water tank or water cooling system, also known as the Clean Water Pump.
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 1780 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 upgreade their centrifugal pumps and mix heavier fluids.
The National Oilwell Varco Mission centrifugal pump line has proven to be the best centrifugal design for handing 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.
Features of the Magnum, 2500 Supreme, and Sandmaster Pumps:
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 recirculation to reducing wear when handling abrasive fluids.
Thicker, Stronger, Concentric Caelng
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.
Wider Impeller, Increased Re-circulation Area
National Ollwell Varco’s Impeller design has wider vanes at the tip which decreases the velocity of the fluid exiting the impeller. This eliminates the abrasive Jetting effect that Is present with narrow Impellers. The distance between the impeller tip and the casing is greater resulting In an Increased re-circulatlon area. Lower velocity rates and increased re-circulation areas allow the exiting fluid to blend with the re-circulating fluid reducing turbulence and wear. The entrance shape of the impeller vanes is more tangential to the circumference of the suction creating a smoother flow pattern. Smooth flow is crucial when handling abrasive fluids.
Heavy-Duty Shaft
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.
The shaft area under the packing Is protected by a replaceable, hook type sleeve with one end free to expand with temperature variation. This sleeve can be replaced In the field without shaft removal.
Highest Quality Bearings
Advanced front and rear bearing design reduces both radial and thrust loads. The outboard bearing Is a duplex set of angular contact bearings with high thrust load capabilities and zero endplay. This bearing set features 24 large balls that are preloaded so that each bearing carries an equal load.
National Oilwell Varco utilizes an inboard bearing that is a single row roller bearing with high radial load capabilities.
This bearing was selected to replace the previously utilized double row bearing due to its engineered bearing life of over 2.2 times the L10 life of previously utilized double row ball bearings.
Bearing Lubrication Options
Oil or grease lubrication is available. Grease lubrication is the factory standard. Oil lubrication Is recommended for pump speeds in excess of 2400 RPM. Oil lubricated pumps must be maintained In a horizontal level position.
Mechanical Seal Options
A type I single tungsten carbide vs. tungsten carbide mechanical seal is standard. Tungsten carbide has proven Itself as a highly abrasive resistant material with a Ph range of 7 to 14, depending on chemical composition. For applications with a lower Ph level the silicon carbide vs. silicon carbide mechanical seal is recommended with its Ph range from 0-14, depending on chemical composition. Both mechanical seals are lubricated by the fluid being transferred and require the pump to remain primed during operation.
When the pump is subject to high temperature fluids, oil base muds with low aniline points, running dry or extremely abrasive fluids, the Olympia™ cartridge type double mechanical seal Is the solution. Utilizing a barrier fluid between the two seals ensures the seal faces remain lubricated even when the pump is run dry. The fluid being transferred has virtually no effect on the seal since the barrier fluid is in contact with the seal faces.
Custom mechanical seal options can be provided for specific applications.
Versatile Stuffing Bex
An easily removable stuffing box allows these pumps to be customized to meet customer needs. The different options available are stuffing boxes to accommodate:
- Shaft packing
- Single mechanical seal
- Olympia™ Double mechanical seal with barrier fluid
- Specialized mechanical seals
The packed box has a tapped opening to the lantern ring to allow grease lubrication or a flush line to be attached.
Dual stuffing box bolts are positioned 180 degrees apart to hold the stuffing box In position during casing removal. When only one stuffing box bolt is used the stuffing box remains In position on one side while the other side moves with the casing, causing the casing to bind and make removal difficult.
Casing Jack Bolts
Casing Jack bolts are an added feature to the Magnum and 2500 Supreme pump lines. Jack bolts allow the casing to be mechanically removed eliminating the need for pry bars or striking the casing during maintenance. This feature simplifies maintenance and eliminates damage to the casing and pedestal during disassembly.
Mission Magnum Centrifugal Pump Features
1. Thick, strong concentric casing provides extended life over conventional volute designs. The concentric design minimizes turbulence and abrasive wear.
2. Wide open-vane Impeller Increases flow and creates lower axial thrust for improved bearing life.
3. Casing gasket recessed for protection.
4. Replaceable stuffing-box cover with dual stuffing box bolts
5. Optional stuffing boxes available for single and double mechanical seal applications and can be configured for flush lines.
6. Long-life no-adjustment mechanical seal available for near zero leakage.
7. Replaceable shaft sleeve prevents shaft wear.
8. Single row roller bearings for increased bearing life.
9. Oil lubrication for bearings available upon request and recommended for pump speeds in excess of 2400 RPM.
10. Duplex angular contact bearings eliminate shaft end play and increases bearing and seal life.
11. Lip and exclusion seals for bearing protection
12. Optional flanged bearing housing available for hydraulic drive
13. External adjustment of impeller clearance extends pump performance life.
14. Large heavy-duty shaft reduces deflection for longer life of packing and mechanical seals.
15. Solid base offering rigidity and strength
16. Casing jack bolts simplify casing removal
17. Easily accessible front access drain, when requested.
18. Back vanes reduce collection of solids at stuffing box and reduce box pressure.
19. Smooth impeller eye for minimum turbulence and higher efficiency.
20. Antl-loosenlng Impeller lock bolt to eliminate pump damage in case of improper motor hook-up.
21. Full pipe diameter entrance for minimum turbulence and maximum efficiency.
Mission Magnum Centrifugal Pump Part List
| Item | Qty | Catalog Number | Part# | Description | Material |
| 1* | 1 | See Below | See Below | Casing | Hard Iron |
| 1A | 1 | 10399-46-1 | 648403012 | Gasket, Casing | Vellumoid |
| 1B | 12 | 3932-61 | 648402014 | Nut, Casing | Stl |
| 1C | 12 | 3862-76 | 648401115 | Stud, Casing | Stl |
| 1D | 1 | 8505/4/1 | 86485503 | Plug, Casing Drain | Stl |
| 1E | 1 | 8505/4/1 | 646400507 | Plug, Flush Line | Iron |
| 2* | 1 | See Below | See Below | Impeller | Hard Iron |
| 2A | 1 | 19110-72 | 648405082 | Seal, Impeller | Viton |
| 2B | 1 | 7300239 | Washer, Impeller | Stl | |
| 2C | 1 | 7415648 | Bolt, Impeller Lock | Stl | |
| 3*# | 1 | 22223-01-30 | 641116157 | Stuffing box, Mech. Seal | Hard Iron |
| 3*& | 1 | 20614-01-30 | 643365042 | Stuffing Box, Packed | Hard Iron |
| 3A | 2 | 3861-117 | 648401016 | Bolt, Stuffing box | Stl |
| 3B& | 1 | 19368-01 | 601499403 | Grease Fitting | Stl |
| 4 | 1 | 20622A | 641103338 | Gland Assy., Packing | Bronze |
| 5A# | 1 | 22451-1 | 648414308 | Seal, Mechanical | Tungsten Carbide |
| 5A~ | 1 | 25014-04M-B | 661007005 | Packing, Shaft | Graphite/Acrylic |
| 6 | 2 | B3701A | 601102494 | Bolt Assy, Gland | Stl |
| 7 | 1 | 20612-02-33 | 646490557 | Shaft | AISI4140 |
| 7A# | 1 | 20943-21 | 641102182 | Sleeve, Shaft (M.S. Pump) | 416SS |
| 7A& | 1 | 20613-21G-7A | 641102181 | Sleeve, Shaft (Pack Pump) | 416SS/Ceramic |
| 7B | 1 | 4372/5/21 | 601212392 | Key, Shaft | 416ss |
| 7C | 1 | 23444-01-72 | 648415156 | Seal, Shaft Sleeve | Viton |
| 8 | 1 | 22210-1A | 641116108 | Deflector Assembly | Bronze |
| 9 | 1 | 20618-12-1 | 644302499 | Frame, Grease Lubricated | Cast Iron |
| 9A! | 1 | May-05 | 601474737 | Plug, Oil Drain | Iron |
| 9BI | 1 | 18471 | 648403608 | Plug, Oil Fill | Iron |
| 9C | 1 | May-05 | 601474737 | Plug, Frame Drain | Iron |
| 9D | 1 | Jan-67 | 601473689 | Breather | Stl |
| 9E | 1 | Mar-78 | 601174584 | Oiler Assembly | |
| 9F! | 1 | A 662014131 | 662014131 | Dip Stick | Stl |
| 9G | 3 | 2538-1H | Bolt, Casing Jack | Stl | |
| 10A | 1 | 20626 | 644303109 | Cover, Inboard Bearing | Iren |
| 10B | 1 | 20625 | 648408706 | Gasket, I.B. Brg. Cover | Vegetable Fiber |
| 10C | 1 | 20619-01 | 648408300 | Oil Seal, I.B. Brg. Cover | Buna-n |
| 10D | 2 | Jan-61 | 601407505 | Bolt, I.B. Brg. Cover | Stl |
| 10E | 2 | I 3932-2 | 601408560 | Nut, I.B. Brg. Cover | Stl |
| 10F | 1 | 20620-01 | 648408409 | Exclusion Seal, I.B. Brg. Cvr. | Buna-n |
| 10G | 1 | 21641-01 | 661010033 | Grease Fitting | Stl |
| 10H | 1 | 648411908 | Grease Fitting | Stl | |
| 11 | 1 | N/A | 661009010 | Bearing, Inboard | Vendor |
| 12 | 1 | 20624-01-01 | 644308504 | Housing, O.B. Bearing | Iron |
| 12A | 1 | 7496-253 | 648402295 | Seal, O.B. Brg Housing | Buna-n |
| 12B | 4 | I 3861-138 | 648401057 | Bolts, O.B. Brg. Housing | Stl |
| 12C | 2 | I 3932-62 | 658404702 | Nut, O.B. Brg. Housing Jam | Stl |
| 13 | 1 | 20617-01-01 | 641103296 | Cover, O.B. Bearing | Iron |
| 13A | 1 | Grease Zerk, O.B. Brg. Cvr. | Stl | ||
| 13B | 1 | 7496-26 | 72200017 | O-ring, O.B. Bearing Cover | Buna-n |
| 13C | 1 | 20619-02 | 648408359 | Oil Seal, O.B. Brg. Cover | Buna-n |
| 13D | 2 | I 3861-139 | 648401081 | Bolt, O.B. Brg. Cover | Stl |
| 14 | 2 | I N/A | 648408201 | Bearing, O.B. (2 Fteq’d) | Vendor |
| 14A | 1 | Apr-24 | 648402105 | Lockwasher, O.B. Bearing | Stl |
| 14B | 1 | Apr-23 | 648402055 | Lucknut, O.B. Bearing | Stl |
| Casings – Includes Studs, Nuts and Gasket | |||||
| 1* | 1 | 19203-01-30A | 641101753 | Casing, 3x2x13 | Hard Iron |
| 1* | 1 | 19205-01-30A | 641101902 | Casing, 4x3x13 | Hard Iron |
| 1* | 1 | 19222-01-30A | 641102058 | Casing, 5x4x14 | Hard Iron |
| 1* | 1 | 19122-01-30A | 641101456 | Casing, 6x5x11 | Hard Iron |
| 1* | 1 | 19123-01-30A | 641101605 | Casing, 6x5x14 | Hard Iron |
| 1* | 1 | 19763-01-30A | 641102157 | Casing, 8x6x11 | Hard Iron |
| 1* | 1 | 19117-01-30A | 641101308 | Casing, 8x6x14 | Hard Iron |
| 1* | 1 | 20937-01-30A | 641102322 | Casing, 10x8x14 | Hard Iron |
| Impellers | |||||
| 2* | 1 | 19204-XX-30 | Varies | Impeller, 3x2x13 | Hard Iron |
| 2* | 19206-XX-30 | Varies | Impeller, 4x3x13 | Hard Iron | |
| 2* | 1 | 19224-XX-30 | Varies | Impeller, 5x4x14 | Hard Iron |
| 2* | 1 | 19121-XX-30 | Varies | Impeller, 6x5x11 | Hard Iron |
| 2* | 1 | 19121 -XX-30 | Varies | Impeller, 6x5x14 | Hard Iron |
| 2* | 1 | 19121-XX-30 | Varies | Impeller, 8x6x11 | Hard Iron |
| 2* | 1 | 19116-A0-30 | Varies | Impeller, 8x6x14 | Hard Iron |
| 2* | 1 | 21867-XX-30 | Varies | Impeller, 10x8x14 | Hard Iron |
XX – Imp. Code – First X equals diameter of impeller in inches minus 4. Therefore 10″ =6, 9″=5, 8″=4, etc…14″ use letter A. Second X equals frational data in 1/8’s. Therefore 1/8″ = 1, 1/4″ = 2, 1/2″ = 4, etc…Thus a 10.5″ impeller is coded as 64
Notes:
* – Casings, Imp. & Stuff Boxes are available as Supreme Hard or Aluminum Bronze
# – Used for pumps equipped with mechanical seal only.
& – Used for pumps equipped with packing only.
! – Used for oil lubricated pumps only.
~ – Packing available in various materials – standard material shown
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