Gardner Denver FO-FXO (a THRU K) two-cylinder pump

Its main applications include:

Drilling services: Fo-fxo pumps are ideal for mud and cementing operations in shallow oil well drilling. Whether on land or offshore, it can stably and reliably circulate drilling fluid, maintain wellbore stability, and effectively control underground pressure. It has also become a trusted tool for drilling contractors around the world, doing well and core drilling equally well.

Exploration Work: in seismic exploration work, the reliability of the equipment is very high. Fo-fxo pumps are widely used to provide the necessary hydraulic power due to their consistent performance and durability.

Industrial and pipeline delivery: in addition to the oil and gas sector, FO-FXO pumps also play an important role in the industrial sector. It can be used for water supply, boiler feed water and other general industrial services, especially in the need for high pressure occasions. Its rugged construction and configurable fluid-end materials make it equally suitable for pipeline applications, whether transporting sour or non-sour crude oil or industrial water.

Power End: an indestructible power base

Frame: the Frame of the pump is of one-piece alloy cast iron construction, providing unparalleled rigidity. This rugged design effectively resists twisting and deformation under heavy loads and ensures accurate alignment of internal transmission components. This is to extend the life of gears and bearings of the fundamental protection, but also the reliability of the entire power system.

Gears: the FO-FXO pump uses Continuous-tooth herringbone Gears, an advanced gear design.

Bearings: the FXO model uses extremely durable sleeve Bearings for the main Bearings and roller Bearings for the pinion shafts.

Connecting Rods & Crossheads: the Connecting Rods are of ductile iron construction with high lead bronze bushings at the crank ends and bronze bushings at the crosshead ends. The crosshead itself is made of reinforced alloy cast iron and reinforced around oversized crosshead pins.

Lubrication System: a simple and efficient flood Lubrication System is used for the internal working parts of the power end.

Fluid end: for versatility and maintainability

Fo-fxo's Divided Fluid Cylinder the design of the FO-FXO's Divided Fluid Cylinder offers two distinct advantages:

Easy to inspect: the split design allows a comprehensive visual inspection of the fluid cylinder interior for early detection of potential problems.

Reduce replacement costs: in the event of damage, operators only need to replace the damaged parts, rather than replacing the entire expensive fluid end assembly. This greatly reduces maintenance costs and spare parts inventory pressure, directly increasing the total value of pump ownership.

Valve-pot Design: the fluid end is of the box type with a separate bolted bonnet above each valve. This means that any one valve can be inspected or replaced without removing the entire discharge manifold or affecting other valves. This design greatly reduces on-site maintenance time and allows the pump to return to service more quickly.

Interchangeable Liners: the use of removable, Interchangeable fluid Liners is a key design to improve pump flexibility. Within the same size group, the operator can adjust the pump displacement and pressure range on site by changing the cylinder liners with different inner diameters. This enables a single pump asset to be adapted to more variable downhole conditions, thereby maximizing equipment utilization and return on investment.

Table 1: Gardner Fo-fxo (10-inch stroke) performance ratings

The data in this table is compiled from multiple technical manuals and covers the performance of the FO-FXO power unit with different fluid units such as FC-FXD, FY-FXD, and FXO-FXO. Note that the type of fluid end determines the available liner size range and corresponding pressure class.

Liner Size	Displacement	Maximum Working Pressure	Applicable fluid end model
In	Mm	GPM (L/min)	BPH
7-1/2	190.5	1843	696
7-1/4	184.2	(1718)	649
7	177.8	1601	604
6	152.4	1,166	440
5-1/2	139.7	257(973)	367
5	127.0	211(799)	301
5	127.0	223(844)	319
4-1/2	114.3	169(640)	241
4-1/2	114.3	179(678)	256
4	101.6	131(496)	187
3-1/2	88.9	98.3(372)	140
3	76.2	69.6(263)	99.4

Source: GPM (gallons per minute) and BPH (barrels per hour) based on 100% volumetric efficiency and rated speed. The maximum working pressure depends on the selected cylinder liner size and fluid end rating.

Table 2: Fo-fxo -LRB-10-inch stroke) core engineering specifications

Parameters	Imperial	Metric
Rated Input HP	96-122 HP	72-91kw
Stroke Length	10 in	254 mm
Max. Pump Speed	65rpm	65rpm
Max. Jackshaft Speed	390RPM (mud condition)	390RPM (mud condition)
Max. Piston Rod Load	11,270 lbs	5,112 kg
Gear Ratio	J 6.0:1	J 6.0:1
Crankcase Oil Sump Capacity	14gal	53liters
Pump Weight (Approx.w/O Skid)	~ 8,300 lbs *	~ 3,765 kg *
Dimensions (approx. Dimensions L × W × h)	117"× 64"× 48	2972 × 1626 × 1219mm
Suction/discharge line interface	4"NPT 300 #/3"NPT 2500 #	(changes depending on configuration)

Note: pump weight may vary depending on fluid end material (e. g. cast iron or cast steel) and configuration. Some technical documentation indicates a weight of up to 11,270 pounds (5,112 kilograms) . Gear ratio according to the pump speed and pinion shaft speed calculation, the specific configuration may be different.

Table 3: Guide to material selection for fluid-end wearing parts

Component	Material Option	Key features and advantages	Recommended Service
Liners	High-chrome	Excellent wear and corrosion resistance, hardness up to HRC 60-65, service life up to 800-1000 hours.	High abrasive mud, cement slurry, general drilling.
	Zirconia/Ceramic	The ultimate wear resistance, life up to 3000-5000 hours, high surface finish, can also reduce piston wear.	Very high abrasive fluids, long cycle continuous operation, lowest total cost of ownership applications.
	Hardened Steel	Cost-effective, balanced performance, is the industry standard for a variety of applications.	Standard muds, cementing, oil/water based drilling fluids, general services.
	Bronze	Excellent corrosion resistance, especially in saline environments.	Water well drilling, hydraulic conveying, brine treatment.
Pistons	Steel-insert Type	Durable and designed to handle fluids with high solid content.	Mud, cement slurry, highly abrasive slurry.
	Solid iron with cast iron ring	Designed for oil medium, good sealing, chemical corrosion resistance.	Crude oil transportation, oil-based mud, general oil service.
	Urethane Bonded	Suitable for high pressure, oil-based or water-based mud, with excellent extrusion resistance and wear resistance.	High pressure drilling, complex mud system.
	Iron/bronze driven	Versatile design for a wide range of fluids.	General Industrial Service, hydraulic service.
Piston Rods	Hardened Steel	High strength, abrasion resistant, is standard in most applications.	Mud, oil, general service.
	Chrome-plated Steel	Chrome-plated steel provides greater corrosion and wear resistance than hardened steel.	Corrosive fluid environment, working conditions requiring ultra-long life.
	Bronze	The best salt water corrosion resistance.	Water Wells, brine injection.
Valves & Seats	Steel (Wing/centre)	Made of high quality alloy steel, can be equipped with polyurethane or rubber valve rubber, solid design, reliable seal.	Mud, cementing, oil, general services.
	Stainless Steel	Excellent resistance to chemical attack.	Acidic fluids, chemical processes, corrosive formation water.
	Bronze	Designed for hydraulic applications, it is highly resistant to corrosion.	Water well drilling, hydraulic conveying.

Optional equipment and skid-mounted scheme

To further enhance the field adaptability of the FO-FXO Pump, we offer a range of optional devices that can be seamlessly integrated into your operating system.

Skids: standard wooden or heavy-duty steel skid mounts are available. Steel pry seats provide greater pump protection and facilitate lifting and movement at the drilling site.

Pulsation Control: optional suction and discharge Pulsation buffers. These devices effectively absorb fluid pulsation, ensure smooth operation of pumps and downstream pipelines, protect precision instruments such as pressure gauges, and reduce system vibration.

Motor Mounts: top Motor mount option for easy integration of pump and Motor into a compact power unit, saving floor space.

Packing: in addition to standard non-adjustable packings, Kevlar or double stacked packings are available for higher pressures and more challenging fluid environments.

Piston Rod Tapers: available with Gardner Denver No. 1 or API No. 1 two standard tapers to ensure compatibility with your existing tools.

Spare parts supply and technical support

We are committed to simplifying your maintenance and ensuring that you get the support you need quickly when you need it.

Full Overhaul Package: we offer a full range of fluid end and power end overhaul packages. These kits contain all the necessary parts for simplified maintenance, such as cylinder liners, pistons, valves, seals, bearings and gaskets, to ensure you can complete high-quality maintenance work at one time.

Global distribution network: Our dealers are well stocked and have trained spare parts specialists who can help you identify and select the right parts.

Order information: to ensure that you get the correct spare parts, please be sure to provide the pump MODEL and SERIAL NUMBER when ordering. This information can be found on the nameplate on the pump rack, and the serial number is usually also engraved on the top of the hydraulic cylinder end of the rack (crosshead guide area) .

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