NOV C-350 Mud Pump

Shijiazhuang Dongli Petroleum Machinery Co., Ltd. is a leading OEM-compatible solutions provider for oilfield equipment. With years of expertise in slurry pump technology, we fully understand the stringent requirements for equipment reliability, durability, and cost-effectiveness in drilling and industrial pumping applications. We proudly offer complete pump sets and a full range of high-quality replacement components fully compatible with the National/Ideal C-350 and C-350-F (forged) dual-cylinder slurry pumps. Whether you need to maintain existing equipment or seek new pumps with reliable performance and competitive pricing, we provide the ideal solution tailored to your needs.

• Classic twin-cylinder design ensures stability and reliability: The C-350 series pumps are renowned for their proven dual-cylinder, dual-acting design, featuring a simple structure, smooth operation, and easy on-site maintenance, earning global trust. Our compatible pumps and accessories strictly adhere to the original manufacturer's design philosophy, guaranteeing consistent performance.
• Durable and rugged, engineered for extreme conditions: Our pumps and critical components are built with premium materials. The robust power frame (available in cast or high-strength welded configurations) and precision-engineered hardened alloy steel V-belts 13 deliver reliable power transmission, built to handle heavy loads and long-term operation in both oilfield and industrial environments.
• C-350-F Forging Hydraulic End Compatibility Solution: For the C-350-F model, we provide a premium forged alloy steel hydraulic end module 13. These precision-forged hydraulic ends, crafted from high-grade alloys (e.g., 35CrMoA or 40CrMnMo), undergo rigorous heat treatment and non-destructive testing. They deliver exceptional fatigue resistance, crack resistance, and erosion resistance, significantly extending service life while reliably handling higher working pressures. This module is the ideal upgrade to enhance the performance and reliability of C-350 pumps.
• Outstanding performance for diverse applications: Our compatible pumps and accessories are engineered to precisely match the C-350 series' performance specifications, delivering reliable flow and pressure output across various cylinder liner sizes. This ensures optimal performance for medium-shallow well drilling, well maintenance, and industrial pumping operations.

We offer a comprehensive product line fully compatible with National/Ideal C-350 and C-350-F slurry pumps:

Complete pump unit: Provides a brand-new, fully assembled C-350-compatible slurry pump, configurable with power units (diesel or motor) and skid-mounted units per customer requirements.

Hydraulic end module:

The standard casting hydraulic end module is an economical alternative.

Advanced Forging Hydraulic End Module: Crafted from premium alloy steel, this module is compatible with C-350-F, delivering exceptional strength and durability for high-pressure applications.

Powertrain assembly and components:

Forged alloy steel crankshaft.

Precision bevel gear / double bevel gear set.

High quality main bearing, pinion shaft bearing, connecting rod bearing, cross head bearing.

connecting rod, cross head, cross head guide plate, etc.

Complete series of hydraulic end wear parts:

Cylinder liner: available in bimetallic (high chromium), ceramic (zirconia), chrome plating, quenching and other materials to suit different abrasion and pressure conditions.

Piston: Integral bonded (polyurethane, nitrile rubber), replaceable rubber type, available in standard and high temperature resistant options.

Pony rod: made of high strength alloy steel, optional surface strengthening treatment.

Valve assembly: Featuring both roughneck-type and pilot-operated valves, with forged alloy steel valve bodies and seats. The rubber seals are available in polyurethane or specialty rubber options, designed to meet diverse pressure and fluid requirements.

Seal and gasket: Provide a variety of high quality seal ring, packing, gasket, ensure reliable sealing of hydraulic end and power end.

Table 1: Technical Specifications Comparison of National/Ideal C-350 and C-350-F

Key difference analysis:

The key distinction is the 'Forged' designation on the C-350-F model, indicating that its fluid end is forged rather than cast. Forging typically delivers superior material strength, toughness, and fatigue resistance, enabling the fluid end to withstand higher working pressures and more demanding operating conditions.

The hydraulic end is the part of the mud pump that directly contacts and processes high pressure and abrasive drilling fluid. The design and manufacture quality of the hydraulic end is very important to the performance and life of the pump.

• Structure and materials:

The standard C-350 specifies that the hydraulic end is typically fabricated from high-strength cast iron or steel. While robust, these castings may develop internal defects (e.g., porosity, inclusions) and stress concentration risks under high cyclic pressure or impact loads, which limits their pressure-bearing capacity and fatigue life.

C-350-F (Forged): Its key feature is the hydraulic end made of forged alloy steel (e.g., 35CrMo or 40CrMnMo). The forging process applies high pressure to deform the metal plastically, eliminating internal defects, refining grain size, and forming continuous fiber flow lines, thereby significantly enhancing the material's strength, toughness, fatigue resistance, and reliability5. The forged hydraulic end typically undergoes rigorous heat treatment (e.g., quenching and tempering) and non-destructive testing (NDT) to ensure it meets high-pressure and long-life requirements.

• Valve Pot Type: The C-350, a conventional double-cylinder double-acting pump, typically features separate suction and discharge valve pots on its hydraulic end. While specific designs may vary slightly by model and production year, the core structure accommodates valve assemblies and directs fluid flow.
• pressure rating ：

The standard C-350, with its cast structure and 600 HP power rating, typically operates at a hydraulic end pressure of 3000 psi, depending on the cylinder liner size selected.

C-350-F (Forged): The forged construction is expected to deliver higher pressure ratings at the hydraulic end. While no direct data is available, the C-350-F's hydraulic end is likely designed to withstand 5000 psi or higher-comparable to 5000 psi or even 7500 psi modules used in F-series or P-series pumps of similar size and power class-enabling it to handle more demanding drilling or industrial pumping tasks.

• Valve Type/API Specifications: C-350 series pumps typically employ valve assemblies compliant with API standards. For these pumps operating at specified pressure levels, API #5 or API #6 valves may be utilized. The valve types include conventional web-guided valves (e.g., three-wing or four-wing valves) and full-open valves (Roughneck type), the latter offering greater flow area. The valve bodies and seats are forged from high-grade alloy steel and carburized to enhance wear resistance.

The power end is responsible for converting the input power (usually from a diesel engine or an electric motor) into the reciprocating motion of the piston, and the reliability of its design is critical to the overall operation of the pump.

• frame construction ：

The power end frame of the National/Ideal pump typically features a robust cast iron or welded steel plate structure. The welded steel plate configuration (sometimes integrated with cast steel bearing housings) delivers excellent rigidity and strength, with potential for weight optimization. Some modern designs incorporate stress-relief heat treatment to enhance durability. No significant differences are anticipated between the C-350 and C-350-F models in terms of their power end frame structures.

• Gear Type: The C-350 series typically features herringbone gears or double helical gears. This design ensures smooth torque transmission, minimizes noise and vibration, and automatically centers to balance axial forces. The gears are made of high-strength alloy steel, heat-treated and precision-machined.
• Bearing configuration: The key components of the power end, such as the crankshaft and pinion shaft, are usually supported by heavy-duty roller bearings, for example, double-row tapered roller bearings or spherical roller bearings, to bear radial and axial loads. The big end of the connecting rod and the crosshead pin are usually also used by needle roller bearings or cylindrical roller bearings.
• Lubrication Method: The C-350 series power unit employs a combination of splash lubrication and/or forced lubrication. As the gears rotate, oil from the reservoir is splashed to lubricate both the gears and bearings. For critical components like main bearings, pinion shaft bearings, and crosshead raceways, a forced lubrication system driven by a gear pump is utilized. This system delivers lubricant through internal oil passages to ensure optimal lubrication across all operating speeds.
• Similarities and differences: The power end design of C-350 and C-350-F is expected to be largely identical, sharing the same frame, gears, bearing configuration, and lubrication system. The main differences lie in the hydraulic end.

The performance of the mud pump is usually expressed by the flow-pressure curve or table, which shows the maximum working pressure and the corresponding displacement that the pump can achieve under the rated speed and rated power at different cylinder liner sizes.

Table 2: Performance data for the National/Ideal C-350

Note: The above data is based on the National C-350 performance chart provided. Displacement (GPM) is the theoretical value at a rated flow rate of 60 SPM. Actual displacement may be slightly lower due to volumetric efficiency (typically below 100%). Input horsepower (HP) refers to the theoretical power required to achieve the specified pressure and flow rate.

• With the same cylinder liner dimensions, the C-350-F can withstand and operate at higher working pressures than the standard C-350. The forging material's strength and fatigue resistance are its key advantages.
• The flow characteristics are expected to be similar to the standard C-350, because the flow is mainly determined by the cylinder liner size, stroke length and stroke speed, and these power end parameters are expected to be the same between the two models.

To ensure reliable operation of C-350 and C-350-F slurry pumps, regular inspection and replacement of wear parts are required. Below is a comprehensive list of wear parts and key components commonly used for these pump models:

Table 3: Common Wear Parts and Critical Components for C-350/C-350-F (OEM Compatible)

Common use cases:

C-350 is suitable for drilling in medium and shallow oil and gas wells due to its power and displacement.

Well repair operation: Its reliability and relatively simple structure also make it a common pump type for heavy well repair operation [Inferred from duplex pump general use].

Industrial pumping: can be used to transport slurry, cement slurry, ore slurry or other industrial fluids, especially in the occasion that need higher reliability.

Construction engineering: such as tunnel excavation, slurry circulation in foundation treatment.

Well drilling:.

Why choose us (OEM value proposition):

• Quality Assurance: We strictly adhere to industry standards like API, using premium raw materials and advanced manufacturing processes to ensure every product delivers outstanding performance and reliability.
• Perfect compatibility: All products are designed to be 100% interchangeable with National/Ideal C-350 and C-350-F pumps and their original components, ensuring easy installation without any modifications.
• Cost-effectiveness: We offer competitive pricing combined with long product life and low maintenance requirements, helping customers significantly reduce the total cost of ownership for slurry pumps.
• Rapid Response: With ample inventory and efficient logistics, we can swiftly address your needs and minimize equipment downtime.
• Professional Support: Our technical experts are available to provide you with professional support services, including equipment selection, installation guidance, and troubleshooting.

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