GARDNER DENVER GP-GXP Pump

Power End: the foundation of indestructible strength

Frame construction: using high strength alloy cast iron one-piece casting frame, compared with the welding frame, this structure provides excellent rigidity and damping performance, effectively avoids the risk of stress concentration and failure of the solder joint under continuous high load.

Crankshaft and eccentric wheel assembly: the core of the power end is a large-diameter crankshaft forged of high-quality alloy steel (4340 or 35CrMo) . Eccentric wheels are made of ductile iron and are known for their high strength and durability, ensuring a smooth transfer of power.

Gears and bearings: Herringbone gear design, this continuous tooth structure ensures smooth and quiet transmission of power while minimizing backlash and achieving superior load distribution.

Connecting rod and crosshead: the connecting rod is a solid ductile iron one-piece structure with a high-lead bronze bushing at the crank end and a bronze bushing at the crosshead end. The crosshead itself is made of strengthened alloy cast iron, which is selected for its high compressive strength under high reciprocating stress and excellent wear resistance.

Lubrication systems: Full Immersion and splash lubrication systems, supplied by a large built-in tank, ensure continuous lubrication of all internal working parts including gears, bearings, connecting rods and crossheads, to reduce friction and dissipate heat effectively. Some models integrate oil pumps and filters to deliver clean lubricants to key components, further ensuring long-term reliable operation of the power end.

Hydraulic end: designed for versatility and easy maintenance

Hydraulic cylinder design: valve box type hydraulic end design, can choose cast steel or ductile iron and other high strength materials, can withstand up to 3060 PSI pressure. A key advantage of the design is that each valve has a separate bonnet, allowing for separate servicing, greatly simplifying maintenance and reducing downtime. In addition, a two-piece"L"-shaped hydraulic end module is available, a design that allows replacement of the suction module individually when it wears out without replacing the entire hydraulic end, further improving maintenance efficiency and cost-effectiveness.

Interchangeable components: detachable, interchangeable cylinder liners are one of the core strengths of the GP-GXP series. This feature gives a single pump great flexibility, users only need to change the size of the cylinder liner and piston, can easily switch between a variety of flow and pressure combinations, thus maximizing the asset utilization of the equipment.

Wear parts: the key wear parts of the hydraulic end -- valves, seats, pistons, and piston rods -- are available in a variety of materials to accommodate the rigors of applications ranging from highly abrasive muds to corrosive chemicals.

Table 1: material and process specifications for core components

Hydraulic end wearing parts technology

Bimetallic high chromium cylinder liners are ideal for abrasive mud. The inner sleeve is made of centrifugally cast high chromium (chromium content not less than 27%) cast iron with hardness up to HRC 60-65, providing unparalleled wear resistance. The jacket is made of forged steel, providing a strong mechanical support. For extreme conditions, zirconia ceramic liners are also available, which are far more resistant to wear than high chromium materials.

The piston rod is made of high strength alloy steel such as 42CRMO. The surface is treated by precision grinding and hard chromium plating to form an extremely smooth, wear-resistant and corrosion-resistant surface, which ensures the effectiveness and long life of the packing seal.

The valve assembly is forged with 20CrMnTi or 8620 alloy steel, and through carburizing treatment to make the working surface hardness of HRC 60 or more, to withstand the huge impact of each valve opening and closing, fully in line with API 7K standards.

Table 2: Gardner Denver GP-GXP series general technical specifications

Table 3: performance data for GXP models with different liner sizes

Note: Performance data are based on 100% volumetric efficiency. Actual performance may vary with operating conditions. The pressure and displacement data are derived from the calculated maximum flow rate (displacement per stroke x 70spm) . Some pressure data are not provided in the source file.

Oil and gas drilling/Workover: as a high-pressure mud pump, GP-GXP is able to efficiently circulate highly abrasive drilling fluids, and its wear-resistant high-chromium liners and carbide valves are able to withstand continuous flushing of drilling cuttings and solids. The forged hydraulic end ensures safety and reliability in high-pressure drilling and fracturing operations.

Pipeline and production transportation: in the pipeline transportation of crude oil (including sour crude oil) and natural gas, the continuous working capacity of GP-GXP is crucial. Its robust power end and reliable lubrication system ensure long-term uninterrupted operation. It is an ideal choice for trunk pressurization and gathering operations.

Industrial slurry and mud pumping: in the field of mining and industrial processing, the pump can effectively transport high concentration, high abrasive slurry and mud. Its powerful horsepower and wear-resistant hydraulic end components ensure excellent performance in environments where other pumps can fail quickly.

Water and core drilling: in deep water and core drilling operations, a steady flow rate and pressure are required to effectively remove cuttings and cool the bit. The reliability of GP-GXP ensures the smooth operation of these critical operations.

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