OILWELL 350-PT Mud Pump

Power rack structure: the unbreakable backbone

The power end of the 350-PT is a fully welded, assembled steel power rack. Compared to conventional casting racks, this advanced structural design provides unparalleled rigidity and stress distribution capabilities that effectively prevent the rack from bending or deforming at maximum load, and provides a unique opportunity for the design of casting racks, thus ensuring precise alignment of internal transmission components.

Drivetrain and bearing assembly: Precise power transfer

Crankshaft: crankshaft is the power end of the core, the use of high-strength alloy steel forged.

Pinion shaft: pinion shaft is made of 42CrMo and other high-grade alloy steel by precision machining, and equipped with high precision herringbone gear (double helical gear) . This gear design ensures a smooth and quiet transmission with minimal vibration, resulting in a significant increase in transmission efficiency 7.

Bearing Assembly: the crankshaft is supported by strong straight roller bearings to withstand large radial forces, while the intermediate and pinion shafts are supported by double-row spherical roller bearings capable of handling both radial and axial loads. Split precision bearings are used for crank pin bearings. This design greatly facilitates the maintenance and replacement in the frame and shortens the maintenance time.

Reciprocating motion assembly: Engineering Design for wear resistance

Connecting rod: the connecting rod adopts two-piece design, allowing the connecting rod and the crankshaft to be installed and assembled independently in the pump body. This is a significant maintenance advantage, greatly simplifying the maintenance process and reducing downtime.

Crosshead: the crosshead is made of high strength ductile iron and operates in a replaceable guide plate that can be adjusted with gaskets. This design allows for precise adjustment of the clearance between the crosshead and guide plate (standard clearance is 0.010 to 0.015 inches) by adding or removing shims to compensate for wear and tear caused by prolonged operation, thus extending the life of the entire reciprocating assembly. Crosshead pin bushings are made of bearing bronze and are selected for their excellent self-lubricating and wear resistance.

Lubrication system: the lifeblood of the power end

The Oilwell 350-PT is equipped with an advanced dual lubrication system that combines pressure splashing and forced lubrication to ensure consistent, reliable film protection for every key moving part under all operating conditions. In addition, the system also integrates efficient filtering devices to continuously keep the lubricating oil clean and prevent premature wear caused by impurities from the source, which provides a fundamental guarantee for the long-life operation of the power end.

Hydraulic end: precision and durability under extreme pressure

Modular"L" design: a revolutionary maintenance experience

The 350-PT hydraulic end consists of three fully interchangeable, independently replaceable"L" cylinder modules. Compared with the one-piece rocket cylinder design, this modular structure provides revolutionary maintenance convenience. The hydraulic cylinder module is connected by sturdy double-headed studs and is equipped with independently removable suction and discharge manifolds, further enhancing the convenience of on-site maintenance.

Materials science and manufacturing processes: forging for failure resistance

Our cylinder modules are made of high quality alloy steel (35CrMo, 40CRMNMO or 4135) by forging process.

Each module is precisely machined by a CNC milling machine to meet precise tolerance requirements. Subsequently, the best mechanical properties (tensile strength 850 MPA, yield strength 670 MPa) and extremely high durability were obtained by strict heat treatment and internal quenching process. We have a zero tolerance policy for defects: each module is subjected to rigorous non-destructive testing (such as ultrasonic testing, penetrant testing) to ensure that there are no cracks, inclusions, looseness and any other defects, welding repair of any kind is strictly prohibited.

Pressure level and compliance: Superior Performance of certification

Our hydraulic end is designed for high pressure operation with a rated working pressure of up to 7,500 PSI (approximately 52 MPa) . What's more, we strictly follow international industry standards such as API-7K and JB/TQ252-81 from design to manufacturing. This is not only a commitment to product quality and safety, but also your choice of our products can be the most powerful protection.

Designed for ultra-long life: an in-depth look at our perishable systems

Wearing parts are not insignificant consumables, but the 350-PT pump performance system core components. We offer a comprehensive range of high quality interchangeable components made of advanced materials and processes. These components are designed to extend service life, reduce maintenance frequency, and ultimately reduce your drilling cost per meter.

Cylinder liner: the first line of defense

Structural design: all of our cylinder liners are clad in high strength forged steel to ensure maximum structural integrity and compression resistance. The casing is precisely machined to ensure perfect concentricity. The unique"HP" lip design effectively prevents the inner sleeve from sliding under high pressure.

Cylinder liner options and applications:

High chromium (bimetal) cylinder liner: inner liner is made of high chromium cast iron (chromium content is not less than 25%) by centrifugal casting. After heat treatment, its hardness is up to HRC 62-69. It is ideal for use in standard water-based muds where normal service life can exceed 800 hours.

Zirconia ceramic liners: made from proprietary zirconia-based composite ceramic materials, the liners have superior hardness (HRC 92-94) , greater impact resistance, and mirror-like finish (4-8 RMS surface finish) . This ultra-smooth surface greatly reduces friction and significantly extends piston life.

Hardened steel cylinder liner: this is a one-piece forged steel cylinder liner, its inner hole after nitrocarburizing and quenching treatment, hardness up to HRC 60, has excellent corrosion resistance, is the specific conditions of high cost-effective choice.

Performance Focus: revolutionary advantages of zirconia ceramic cylinder liners

A four-year field comparison study of more than 12,000 pumping hours has shown that slurry pumps with zirconia ceramic liners achieve remarkable results compared to conventional high-chromium liners:

Four times less downtime: more stable operation, significantly lower NPT.

Piston consumption reduced by 80% : extremely low coefficient of friction greatly extends piston life.

Total cost of wearing parts reduced by 76% : despite high initial investment, its extended life and protection of other components result in a much lower total cost of ownership (TCO) than conventional cylinder liners.

Piston: precise transmission of pressure

Structural design: Our Pistons are manufactured based on a sturdy forged alloy steel piston core for maximum tensile strength. It is designed to withstand pressures up to 7,500 PSI and temperatures up to 350 °F (177 °C) .

Piston options and applications:

Bonded polyurethane pistons: an excellent choice for oil-based mud and high-pressure drilling. The dual-hardness polyurethane compound is bonded directly to the piston core, providing excellent wear and extrusion resistance.

Adhesive rubber piston (NBR) : a rugged and reliable choice, ideal for chemical and oil-based muds. Nitrile rubber (Nbr) is strongly bonded to the piston core, eliminating leakage paths.

Replaceable Rubber Piston: provides convenience for quick on-site maintenance. The Piston Cup is replaceable on a reusable piston core and features a fabric-reinforced extrusion ring for extended life.

Valve Assembly: Guardian of flow

Design: body and seat are machined from forged alloy steel for durability under high pressure and are often oxidized to increase corrosion resistance. We offer a wide range of designs to suit a variety of operating conditions.

Design options:

Fully Open valve assembly: provides maximum flow area and reduces turbulence and wear as the fluid passes through. Ideal for high displacement applications.

Ribbed guided valve assemblies (such as four-ribbed valves) : provide superior stability and a strong sealing surface, ideal for high-pressure applications.

Valve rubber material: valve rubber is the main sealing element, optional materials include:

Polyurethane: excellent durability, abrasion resistance and long life in all mud types. Standard issue.

Nitrile rubber (NBR) : has excellent properties in oil-based drilling fluids.

Piston rod with connectors: critical connections

We use a two-piece threaded piston rod design. This ingenious design allows replacement of the piston without removing the cylinder liner, greatly saving valuable on-site maintenance time. The surface of the piston rod is cadmium plated to enhance its corrosion resistance. We also provide a full range of connecting parts including intermediate rods, couplings, clamps and nuts to ensure the integrity and reliability of the entire system.

Verifiable data is the cornerstone of building trust. The performance of the Oilwell 350-PT is not a judgment call, but a set of proven, quantifiable capability parameters that allow you to plan your drilling operations with confidence.

Table 1: key technical specifications for the Oilwell 350-PT

Table 2: Oilwell 350-PT performance matrix (based on 350HP input power)

This form is a core tool for drilling engineers and site supervisors to plan operations. It clearly shows the maximum pressure and displacement of the pump under different cylinder sizes, and provides a reliable basis for the precise setting of drilling parameters.

Table 3: Guide to the selection of materials and properties for wearing parts

We follow the industry's highest standards of manufacturing equipment, which not only ensures the quality and safety of products, but also ensures its seamless integration into your existing operating system.

API and ISO certification: we solemnly declare that Oilwell 350-PT and all its core components are designed, manufactured and tested in full compliance with API-7K and ISO 9001 standards. This is a globally recognized mark of quality and safety, and there is no compromise.

100% interchangeability: we guarantee that all hydraulic end modules, wear parts and replacement parts are 100% interchangeable in size and function with original OEM parts. This provides customers with flexibility and choice in the supply chain, so you can rest easy when purchasing, because our parts can be perfectly matched each time. This open strategy stems from our absolute confidence in the performance and value of our products.

NACE compliance: for operations in acidic gas environments containing hydrogen sulfide (H2S) , the materials we use are applicable as long as the drilling fluid environment is controlled in accordance with NACE-01-75, ensures the safety of equipment in corrosive environments.

The choice of our Oilwell 350-PT is the first step in a long-term partnership that will enhance operational efficiency and profitability. We offer you not just a pump, but a complete value system, it consists of rugged durability, simplified maintenance procedures, and a lower total cost of ownership through superior component life.

Your Drilling Project needs reliability, and your budget needs high value. Oilwell 350-PT. Contact our expert sales engineering team immediately to discuss your specific application needs, obtain detailed quotes, and explore how we can be your loyal partner in the pursuit of performance excellence.

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