Product Overview
Meta Description (SEO): The definitive guide to the NOV National 7-P-50 three-cylinder mud pump. Discover official OEM technical specifications, performance metrics, and detailed material analysis of forged alloy steel power end, L-type hydraulic end, and API 7K-certified components. This is the ultimate resource for drilling professionals.
Table of technical parameters
|
Parameters |
Parameter values |
Technical background |
|
Model |
8-P-80 |
NOV standard industrial pump series, designed for deep well drilling, compatible with onshore and offshore platforms. |
|
Rated power |
800hp (expandable to 1600hp) |
Dual-gear gearbox drive, support heavy duty continuous operation, adapt to 50-60hz power system. |
|
Maximum flow rate |
542 GPM (about 1228m 3/h) |
Three-cylinder synchronous piston, stroke length 12 inches, stroke adjustable range of 60-120spm. |
|
Maximum working pressure |
5000 PSI (34.5 MPa) |
The forging fluid end cooperates with the strengthening valve group to realize high-pressure output and support the transportation of sand-containing slurry. |
|
Material of fluid end |
High chromium cast iron (optional ceramic coating) |
High chromium cast iron has a hardness of HRC 62 and more than three times the wear resistance of plain carbon steel. |
|
Piston assembly |
Tungsten carbide piston + multi-layer aramid seal kit |
The seal withstands 35 MPA pressure, supports high temperature (150 °C) mud environments, and has a life of up to 2000 hours. |
|
Connection interface |
6-5/8"Flange (API 7K) |
Compatible with mainstream drilling rig piping system to support rapid disassembly and maintenance. |
|
Solid content of applicable medium |
≤15% |
The valve seat has an anti-clogging flow channel design to accommodate complex muds containing cuttings and bentonite. |
Core Strengths (SEO keyword embedding)
High-voltage overload capability
The 800HP dual drive system supports ultra-long stroke operations in shale gas horizontal wells with API 7K certified fluid ends.
Intelligent operation and maintenance compatibility
Optional Nov RigSense monitoring module, real-time tracking of piston wear and sealing status, data synchronization to the cloud platform.
Global network of services
Relying on NOV Global 700 + Service Center, provide 48 hours of emergency spare parts delivery (including valve group, piston assembly, etc.) .
Application scenarios (industry keyword optimization)
|
Industry |
Typical uses |
Adaptation scenarios |
|
Oil and gas drilling |
Deep well mud circulation and shale gas fracturing fluid transportation |
Ceramic coating fluid end + explosion-proof motor, suitable for 5000 PSI high pressure pumping. |
|
Development of geothermal energy |
Mud cooling system for high temperature geothermal wells |
High temperature seal kit (180 °C) + dual mechanical seal configuration. |
|
Mine geological exploration |
Drilling mud pressurization in hard rock formations |
High chromium cast iron valve box + anti-corrosion coating to support sulfur containing medium. |
Hydraulic end core fittings
Pump Case (forged alloy steel)
Material and process: using 35CrMoA or 40CrMoMn high strength alloy steel whole die forging, after normalizing + quenching and tempering treatment, the hardness of the inner wall reaches HB285-330, the tensile strength is more than 850 MPA, in line with the API 7K standard (Certificate API Spec 7K-0335)
Inner cavity electropolishing (Ra ≤0.6 μm) , optimized turbulence resistance, adapt to 5000 psi high pressure condition, fatigue life increased by 30% .
Anti-corrosion design: epoxy ceramic coating sprayed on the outer surface, salt spray test for more than 1500 hours, suitable for acidic environment with H2S and deep sea drilling scenarios, protection level IP69K
Valve box assembly
Structural optimization: split clamp design combined with groove stress dispersion technology, with 4"-6" cylinder liner, mounting tolerance ± 0.03 mm. Internal nitriding treatment (hardness HRC55-60) , anti-wear life is 3 times of ordinary material, adapt to API 7 # standard valve structure
Intelligent compatibility: support IoT wear monitoring (SAE J1939 interface) , real-time feedback valve box pressure fluctuation data, suitable for Gardner Denver, EMSCO and other similar pump type
Ceramic Liner (Mission series)
Material and properties: zirconia toughened ceramic (ZRO2≥85%) lining + stainless steel composite structure, mirror polishing of inner wall (Ra ≤0.2 μm) , hardness HRC62, wear resistance 6-10 times that of bimetallic cylinder liner, temperature resistance 500 °C, hardness HRC62, over 5000 hours service life, suitable for high abrasion mud containing quartz sand
Economic Alternatives: bimetal cylinder liner with high chromium cast iron lining (CR28%-30%) , centrifugal casting process, cost reduction of 30% , suitable for shallow non-corrosive media
Suction/discharge valve assembly
Valve body and seat: tungsten carbide (WC-15CO) or high chromium alloy (20CrMnTi) , mirror polished (Ra ≤0.1 μm) , sealing surface cone angle 60 ° ± 0.5 ° , particle erosion resistance increased by 70% , suitable for high frequency reciprocating motion
Spring Assembly: the adjustment range of pre-tightening force of double-layer spiral spring is ± 25% , and the fatigue life exceeds 1.5 × 107 cycles, which is suitable for high-stroke conditions of shale gas fracturing
Exhaust manifold
High-pressure piping: integrally molded 316L stainless steel casting, inner wall mirror polished (Ra ≤0.4 μm) , standard 4"ANSI flange connection, 20% turbulence pressure loss reduction, built-in spherical preloaded air bag, pressure fluctuation ≤ ± 2% , in line with API 674 standard."
Power end key components
Crankshaft assembly
Material and accuracy: 34CRNIMO6 forged steel quenching and tempering treatment, main journal roundness error ≤0.005 mm, with SKF 240 series bearings for 12000 hours maintenance-free, adapt to ISO VG460 lubricant
Lubrication system: forced circulation oil cooling design, equipped with magnetic oil filter (filtering accuracy 10μm) , to adapt to the polar -40 °C environment
Sealing system
High pressure sand control design: double lip PTFE oil seal + spring storage coil, temperature resistance-50 °C to 200 °C, stepped labyrinth structure sand retention efficiency > 98% , leakage rate ≤0.03 ml/min (ASME B16.20 standard)
Stem seal: polyether ether ketone (Peek) guide ring + PTFE ring, acid and alkali (pH 0-14) , adapt to CO2 and H2S Extreme Environment
Piston assembly
Piston core: 42CrMoV quenched and tempered steel, surface laser cladding tungsten carbide coating (thickness 0.4 mm, hardness HV1500) , and ceramic liner matching life increased by 80%
Rubber components: aramid fiber reinforced hydrogenated nitrile rubber (AF-HNBR) , oil resistance and hydrolysis resistance, average life ≥450 hours
Valve Guide and Gasket
Guider: tungsten carbide coating surface treatment, guiding accuracy ± 0.02 mm, oil-free condition wear rate ≤0.005 mm/1000h
Metal spiral wound gasket: Inconel 625 alloy + flexible graphite layer, sealing pressure up to 7500 psi, temperature 850 °C, according to ASME B16.20 standard
Technical superiority and certification
Standardized production: full range of accessories in accordance with API Spec 7K/ISO 13533, provide SGS material analysis and ASTM E384 microhardness test report
Intelligent monitoring: Valve Guide built-in wear sensor, support remote warning and life prediction, adapt to National, Gardner, TSC and other mainstream pump type
Environmental Compatibility: the sealing gasket adopts non-asbestos graphite winding structure, conforms to EPA 40cfr Part 763 standard, and is suitable for high corrosion scenarios such as shale gas exploitation
Data traceability and application scenarios
Adaptation scenarios: ultra-deep Wells (> 8000 m) on land, offshore platforms, high-pressure fracturing of shale gas (> 10,000 psi) and electric drive fracturing cluster operations
Measured data: ceramic cylinder liner life data from the Liaohe oilfield deep well drilling project (cumulative operation of 5000 hours without wear) , high pressure seal through GB/T 14211-2019 certification
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