GARDNER DENVER GP-GXR Pump

Specialty advantages in the field of application

Oil and gas drilling operations: as a mud pump, GP-GXR is the"Heart" of the drilling fluid circulation system. It continuously pumps high-solid drilling fluid down the hole, effectively cooling and lubricating the bit, carrying cuttings to the surface, and maintaining hydrostatic pressure in the wellbore to prevent geological risks such as blowouts. Its ruggedness ensures reliable operation during critical drilling stages, both on land and offshore.

Pipeline transportation and oil production service: GP-GXR pump is also suitable for long-distance pipeline transportation of crude oil, produced water and other fluids. Its power end can withstand continuous high-load operation, and the hydraulic end of a variety of material options to deal with the corrosiveness of different fluids to ensure stable performance in production and gathering.

Mining and industrial slurry conveying: in mining, metallurgy and other industrial fields, slurry conveying with high concentration and strong abrasiveness puts forward very high requirements for the wear resistance of equipment. GP-GXR pump hydraulic end designed for such conditions, can choose high-hardness wear-resistant materials, effective treatment of mineral slurry, slurry, coal slurry and other industrial waste, is the ideal choice for the application of severe slurry pump.

Power end-the cornerstone of stable operation

Frame structure: the core of the power end is a monolithic cast high-strength alloy iron or ductile iron frame.

Crankshaft and connecting rod: crankshaft is the core component which bears the maximum alternating stress. We use high quality alloy steel (4340 or 35CrMo) for integral forging. The connecting rod is made of high strength ductile iron with high lead bronze bushing at the crank end and bronze bushing at the crosshead end to ensure reliability and wear resistance under heavy load.

Gear system: the smoothness of power transmission directly affects the life and noise level of the whole pump. GP-GXR uses precision machined Herringbone Gears with continuous teeth. This gear design enables smooth meshing and uniform force transmission, effectively eliminates axial thrust, and significantly reduces noise and vibration.

Bearings and lubrication systems: to support high load drivetrains, heavy duty tapered or spherical roller bearings are used on crankshafts and intermediate shafts. These bearings are designed to withstand high radial and axial loads.

The hydrodynamic end-designed to withstand abrasive environments

Cylinders (modules) : cylinders are forged in one piece from high quality alloy steel (AISI 4130,35CRMO, 40CrMnMo) and subjected to a rigorous heat treatment and internal hardening process to withstand operating pressures up to 7,500 PSI or higher. We offer advanced two-piece"L" cylinder design options. Compared with conventional one-piece or Valve-over-Valve structures, the suction and discharge modules of the"L"-shaped design are independent, which means that when wear is mainly concentrated in the suction chamber, the user only needs to replace the suction module, and the Valve-over-Valve structure is more flexible, without replacing the entire expensive cylinder, thus significantly reducing maintenance costs and repair time.

Cylinder liners (first line of defense) :

High chromium bimetal cylinder liner: the shell is made of high strength forged carbon steel to ensure excellent compression resistance; the inner casing is made of high chromium cast iron (chromium content is not less than 27%) by centrifugal casting process. Centrifugal casting ensures that the inner casing is dense and defect-free. Subsequently, the inner casing is subjected to quenching heat treatment to achieve an extremely high level of surface hardness of HRC ≥60-65, resulting in excellent wear resistance and corrosion resistance, and a service life of more than 800 hours under standard operating conditions.

Zirconia ceramic liners: for extreme wear and corrosion conditions, we offer zirconia ceramic liners as a top option. The hardness of zirconia ceramics is very high (HRC > 90) , which is much higher than that of metal materials. This not only greatly prolongs its service life (up to 4000 hours) , but also significantly reduces piston wear and the load on the lubricating and cooling system, thereby reducing overall operating costs.

Valve Assembly (heart of hydraulic end) :

Standards and materials: Valve Assemblies (body and seat) are designed and manufactured in full compliance with API 7K, ensuring interchangeability and quality assurance worldwide. The body and seat are forged in one piece from high quality alloy steels such as 20CrMnTi or 40CrNiMo.

Manufacturing Process: the forged blank is subjected to a carburizing heat treatment process to form an extremely hard carbonized layer on the surface of the part, followed by quenching to achieve a working surface hardness of HRC ≥60, at the same time, the core is maintained with good toughness to resist the repeated impact of high-pressure fluid.

Piston and piston rod:

Piston: we offer a variety of piston options to suit different drilling fluid systems. The Bonded Urethane Piston is designed for use with oil-based or synthetic muds and has excellent chemical and abrasion resistance. For water-based muds, NBR pistons are a more cost-effective option.

Piston rod: made of high strength alloy steel (e. g. 42CrMo) and heat treated for optimum combined mechanical properties. The surface of the rod body is treated by precision grinding and hard chromium electroplating to form a smooth, wear-resistant and corrosion-resistant protective layer to ensure its smooth movement and long-term sealing in the stuffing box.

List of materials and processes for key components

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