Emsco FC-2200 Mud Pump

Core performance parameters

pressure and displacement performance curve

Hydraulic Performance Table of FC-2200 (Based on 100 SPM Rated Stroke)

The data are calculated based on 100% volumetric efficiency and 90% mechanical efficiency.

The Rack Structure: The Victory of Welding Technology

Unlike the cast frames commonly used in small pumps, the FC-2200 features a high-strength welded steel frame (Fabricated Steel Frame).

Material selection: high quality low alloy high strength structural steel plate, which has excellent welding properties and impact toughness.

Process flow: After precision cutting and bevel treatment, the steel plate undergoes multi-pass welding by certified welders. The entire frame must then undergo full heat treatment (annealing) to eliminate residual stresses from welding. This step is critical, as residual stresses combined with operational stresses during pump operation could easily cause weld cracking.

Precision Machining: The heat-treated frame undergoes single-pass machining on a large boring machine to ensure absolute parallelism and perpendicularity between the crankshaft hole and the crosshead guide plate hole. This machining precision directly determines the wear rates of the bearing and crosshead. According to the maintenance manual, the clearance fit between the wear-resistant ring and the frame hole has strict tolerance requirements (e.g., 0.002 "-0.007" clearance fit) to ensure proper alignment.

Crankshaft Assembly: The Toughness of 4340 Alloy Steel

The crankshaft is one of the most expensive and complex parts in the mud pump. FC-2200 adopts the design of eccentric crankshaft with integral forging.

Material upgrade: While the standard configuration typically uses 4140 alloy steel, OEMs often recommend 4340 nickel-chromium-molybdenum alloy steel (NCM steel) to handle extreme operating conditions.

4340 vs 4140: The addition of nickel to 4340 steel significantly improves its deep quenchability and low-temperature impact toughness. This means that even after millions of heavy-load cycles, 4340 crankshafts have a much lower risk of fatigue fracture compared to standard 4140 crankshafts.

Structure features: The integral forging eliminates the interface of the combined crankshaft, thus eliminating the risk of loosening. The eccentric wheel is directly machined on the shaft and supported by a large-diameter spherical roller bearing. This bearing has an automatic self-aligning function, which can compensate for the slight elastic deformation of the crankshaft under heavy load and prevent the edge stress concentration.

Gear installation: The large gear (Bull Gear) typically features a herringbone tooth profile, which automatically counteracts axial forces, allowing the bearing to handle only radial loads and thus significantly extending its service life.

Pinion Shaft

The pinion shaft, serving as the direct load-bearing point for power transmission, is forged from high-strength alloy steel. Its design enables operation from either the left or right side of the pump, enhancing on-site installation flexibility. The bearing housing incorporates labyrinth seals to prevent lubricant leakage and external contamination.

Crosshead and Extension Rod

The crosshead assembly is responsible for converting the rotational motion of the crankshaft into pure linear reciprocating motion, isolating the lateral force of the connecting rod, and protecting the piston rod and cylinder liner.

• Crosshead: Made of ductile iron or cast steel, with replaceable upper and lower guides. The guides are typically lined with babbitt alloy or special wear-resistant copper alloy to reduce friction.
• Pony rod: The key component connecting the crosshead to the piston rod.

Material standard: 35CrMo is the standard material choice for OEM. This chromium-molybdenum steel has extremely high tensile strength and creep resistance.

Surface Treatment: The intermediate tie rod, which reciprocates within the stuffing box, must undergo hard chrome plating and mirror-polishing. This coating not only ensures an exceptionally low friction coefficient but also delivers outstanding corrosion resistance, effectively preventing seal ring damage from slurry splashing.

Connection type: The piston rod is connected by clamp type, which allows the piston rod to have a slight self-centering ability, so as to prevent the piston from being worn out due to slight misalignment

Lubrication System:Double Safeguards

To prevent the motor from burning out during tens of thousands of hours of operation, the FC-2200 features a hybrid system combining forced lubrication and splash lubrication.

• Forced lubrication: An external or internal gear oil pump delivers lubricating oil directly through piping to the main bearing, connecting rod bearings, and crosshead pin 2. The system incorporates a filter to intercept impurities such as metal shavings.
• Settling chamber design: A dedicated settling chamber is installed beneath the crosshead guide plate. Given the proximity of the crosshead area to the hydraulic end, it is prone to contamination by sludge or condensate. The settling chamber utilizes gravity separation to allow water and heavy contaminants to settle, preventing their backflow into the main oil tank and potential contamination of the crankshaft bearings.
• Oil selection: We recommend high-quality extreme pressure gear oils, such as Shell Tellus 68/100 or Regal Oil R&O 150, to accommodate varying ambient temperatures.

Modular Design: Straight-through and L-shaped

The FC-2200 features three independent hydraulic cylinder modules, allowing maintenance without replacing the entire hydraulic system when a single module fails, significantly reducing repair costs.

Structural configuration: The modern FC-2200 typically employs a ** "Valve-over-Valve" (Valve-over-Valve)** or L-shaped design. The suction valve is positioned directly beneath the discharge valve. This vertical arrangement minimizes dead volume, enhances volumetric efficiency, and ensures smoother fluid flow, thereby reducing vortices and erosion.

Pressure rating: The standard module is designed for 5,000 PSI, while the upgraded version for deep well operations can withstand 7,500 PSI.

Module Science of Materials: From 4130 to 35CrMo

The liquid cylinder module must bear the huge internal pressure, so the material selection is very important.

Standard type (5000 PSI): Typically forged from AISI 4130 or 8620 alloy steel. These materials undergo normalizing and tempering treatments, offering excellent overall mechanical properties and weldability.

High-performance variant (7500 PSI): Forging must be performed using 35CrMo or 40CrMnMo alloy steel. The forging process refines grain structure, eliminates casting defects (e.g., porosity and shrinkage cavities), and creates fiber flow along the stress direction, resulting in exceptional fatigue strength. OEM specifications strictly prohibit welding repairs on the module body, as the heat-affected zone may become a fatigue crack initiation point.

Detailed Explanation of the Technology for Fragile Parts

Bi-metal Liner

The shell is forged from high-grade carbon steel (e.g., 45# steel) to provide structural support.

• Lining: Crafted from **high-chromium cast iron (High Chromium Iron)** through centrifugal casting, with chromium content typically ranging from 26% to 28%. The heat-treated inner surface achieves a hardness of HRC 60-65. This exceptional hardness enables it to withstand intense abrasion from barite powder and rock cuttings.
• Processing precision: The inner hole must undergo honing to achieve mirror-like smoothness, thereby reducing heat generated by piston friction.

piston and piston rod

Piston core: forged steel, ensuring no plastic deformation under high pressure.

Sealing rubber:

• Nitrile rubber (NBR): Suitable for conventional water-based slurry, operating temperature below 120°C.
• Polyurethane (Urethane): Excellent tear and abrasion resistance, suitable for high-pressure applications, but not heat-resistant.
• Hydrogenated nitrile rubber (HNBR) is used in high-temperature deep wells or oil-based mud environments.
• The piston rod is designed in two parts and connected with the middle tie rod by a clamp. The surface of the piston rod is also carburized or chrome-plated to prevent corrosion.

Valve and Seat

• Standard: The valve adopts **API 7K Full Open** design. This design features a valve body with only guide legs and no central shaft, providing a large flow channel area and low fluid resistance.
• Material: The valve body and valve seat are usually made of 20CrMnTi or AISI 8620 carburized steel. The depth of the carburized layer is controlled at 1.5-2.0mm, the surface hardness is HRC 58-62, and the core maintains high toughness to withstand the huge impact load when the valve is seated.
• Sealing: Polyurethane inserts provide initial sealing under low pressure, while precision metal conical contact ensures primary sealing under high pressure.

suction desurger

The SD-8 model is typically equipped with an air suction bag designed to absorb kinetic energy fluctuations in the suction line. Although the three-cylinder pump delivers relatively stable flow, it still generates transient negative pressure during the suction stroke. The SD-8 mitigates suction pressure through the expansion and contraction of its internal air sac, effectively preventing cavitation-a critical safeguard for the hydraulic system's internal components.

Exhaust Pulsation Dampener

The system typically employs PD-55 or KB-75 spherical dampers. At the high-pressure discharge end, even minor pressure fluctuations can cause severe vibrations in long-distance pipelines. These dampers, filled with pre-pressurized nitrogen, absorb peak pressure and compensate for trough pressure, keeping fluctuations within 5% to protect downhole motors and MWD instruments.

Liner Wash System

This is an independent low-pressure water circulation system, usually driven by a small electric centrifugal pump.

• Function: Continuously inject cooling water (or coolant mixed with rust inhibitor) into the back of the piston and cylinder liner during operation.
• Significance: Friction between the piston and cylinder liner generates substantial heat. If not promptly dissipated, the piston rubber may rapidly soften, bubble, or even ignite. The OEM drawings detail the coolant spray pipe layout to ensure full coverage of the piston's entire stroke.

The high pressure safety valve must be installed on the discharge pipe manifold, which is of the type of shear pin or spring reset.

• The opening pressure should be set at 110% of the rated pressure of the cylinder liner. It is forbidden to install a stop valve at the outlet of the safety valve. The pressure relief line must be straight to the mud tank and fixed firmly to prevent the reaction force of the pressure relief from injuring people.

Common Fault Troubleshooting Table

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