Honghua 3NB1300F Mud Pump

 

The Rigid Revolution of Welding Technology

• The 3NB-1300F's frame epitomizes the pinnacle of modern welding technology. We opted for a steel plate welded structure over a fully cast housing, a design choice driven by rigorous mechanical analysis rather than cost-cutting considerations.
• Stress distribution optimization: The welded structure enables engineers to strategically add ribbed slabs at stress-concentrated areas (e.g., main bearing housing support points) while reducing material redundancy in non-load-bearing zones. This on-demand material allocation strategy achieves high rigidity in the pump body while significantly lowering its self-weight, with the total dry weight controlled at approximately 25,850 kg (56,990 lb).
• Vibration energy dissipation: In drilling operations, the pump body is subjected to dual vibration frequencies from formation feedback and mechanical reciprocation. The composite geometry within the welded steel plate structure effectively disrupts the propagation path of vibration waves, serving as passive damping to protect the precision bearing system from micro-wear.
• Manufacturing stability: The cast steel transmission bearing housing and crankshaft upper/lower bearing housings are precision-welded into the frame. To eliminate high-temperature thermal stresses during welding, the entire frame undergoes rigorous post-welding annealing treatment. This process ensures geometric stability throughout the frame's tens of thousands of hours of operation, maintaining consistent coaxial alignment between the crankshaft and crosshead.

The Metallurgical Victory of Crankshaft System: 42CrMo Alloy Steel

The crankshaft, the most heavily loaded component in the powertrain, must withstand 120 impacts per minute without structural failure. The Honghua 3NB-1300F employs 42CrMo alloy steel as its core material.

• Material Science Analysis: 42CrMo is a super high strength steel containing chromium (Cr) and molybdenum (Mo). Chromium enhances the steel's hardenability and hardness, while molybdenum eliminates temper brittleness and improves high-temperature strength.
• Hollow structure design: Based on the OEM component catalog (part number GH3161-02.08.00), we adopted a hollow crankshaft design. This design is highly ingenious:

1. Reducing rotational inertia: The hollow shaft design significantly lowers rotational mass, enhancing the pump's responsiveness during startup and speed changes while reducing current surges on the drive motor (typically a DC or AC variable frequency motor).
2. Improving material properties: In the process of forging and heat treatment, the hollow structure allows the cooling medium to contact the inner and outer surfaces of the material more uniformly, so that the metallographic structure of the whole section is more uniform, and the common problem of "core softening" in solid large shaft is avoided.

• Excentric structure: The pump adopts a typical eccentric wheel structure, and the unbalanced torque is minimized by precise dynamic balance calculation.

Transmission System: The Silent and Smooth of the Herringbone Gear

The power transmission is achieved through a pair of high-precision herringbone gears, with a precise speed ratio of 4.206:1. This ratio optimally reduces the typical 1000-1200 RPM drilling motor speed to the pump's rated 120 strokes per minute (SPM).

• Self-Cancellation of Axial Forces: Single bevel gears generate substantial axial thrust during operation, requiring heavy-duty thrust bearings for balance. In contrast, helical bevel gears (double helical gears) utilize opposing helix angles in their left and right halves to cancel axial components internally. This design not only simplifies bearing configurations but also eliminates axial play, significantly extending the service life of both the pinion shaft and main bearing.
• Continuous meshing performance: The V-gear features an exceptionally high overlap ratio, with multiple gear teeth simultaneously engaged at all times. This continuous engagement ensures torque transmission as smooth as silk, significantly reducing noise and vibration while providing a more ergonomic working environment for drilling platform personnel. The tooth surface is treated with medium-hard gear surface technology, balancing wear resistance with impact toughness.

 

 

The crosshead is the pivotal hinge that converts the crankshaft's rotational motion into the piston rod's linear reciprocating motion. The 3NB-1300F model features a crosshead cast in a single piece from nodular cast iron.

• Material selection: Ductile iron not only possesses the excellent friction-reducing and oil-absorbing properties of cast iron, but also has strength and toughness comparable to steel. In extreme lubrication-deficient moments, the graphite balls within the ductile iron matrix can self-lubricate, preventing cylinder scoring.
• Adjustable guide plate design: The crosshead moves between the upper and lower guide plates. Macro Design's innovation lies in its Top and Bottom Guidance system, which allows coaxiality adjustment by adding gaskets to the lower guide plate.

Technical analysis: Over time, the guide plate and crosshead shoes inevitably wear out, causing the center to sink. Without proper adjustment, the piston rod will operate at an angle to the intermediate tie rod, leading to rapid failure of the packing seal. Honghua's adjustable design enables the equipment to self-repair geometrically, significantly extending the maintenance cycle.

• Intermediate Rod and Connection: The crosshead is connected to the hydraulic end piston rod via an extension rod (Pony Rod). We offer various extended rod specifications, including 19-5/8 "(GH3161-26.08) and 24" (GH3161-26.11), featuring a double-sealed dustproof housing that completely prevents drilling fluid backflow into the power end oil pool.

 

 

Liquid Cylinder Module: A Solid Defense of 35CrMo Forged Alloy Steel

The 3NB-1300F features an industry-standard three-cylinder independent "L" shaped hydraulic cylinder module design.

• The absolute necessity of forging process: All hydraulic cylinder modules are made of high-quality 35CrMo or 40CrMnMo alloy steel forgings. We strictly prohibit the use of castings or welded parts as substitutes.

Microstructural advantage: The forging process applies intense mechanical pressure to compact the cast-state porosity within the steel ingot and realign the grain flow along the part's contour. This dense fibrous structure grants the module exceptional fatigue crack resistance when subjected to pulsating internal pressures up to 34.5 MPa.

Zero Defect Commitment: Every blank must undergo three-tier forging standard inspection prior to processing, with ultrasonic (UT) and magnetic particle (MT) non-destructive testing to ensure complete absence of interlayers, cracks, impurities, or overburn defects.

• Compatibility Strategy: The hydraulic cylinder module of Honghua 3NB-1300F is fully interchangeable with the Bomco/Emsco F-1300 series. This strategic decision significantly reduces inventory risks for users, enabling them to leverage the globally distributed F-series supply chain resources in emergencies. It also underscores Honghua's pivotal role in global standardization.
• Double-ended stud connection: The module is connected to the rack using high-strength double-ended studs (Studs). As specified in the accessory list, these include discharge-to-suction module studs (Stud, Discharge to Suction Module, 4019-44) and power-end studs (Stud, Power End, 4019-46). The studs are specially heat-treated to prevent creep fracture under high tension.

 

Valve box and valve seat assembly: precision check system

The valve box is designed to meet API 7# standard dimensions. As a one-way check valve, it must achieve 120 open-close cycles per minute while maintaining absolute sealing at the closing moment. Any minor leakage will instantly develop into a 'washout' (a term describing rapid, excessive leakage).

Material analysis: The valve body and seat are typically fabricated from high-grade alloy steels such as 20CrMnTi or 40CrNiMo.

• Integrated forging and carburizing: The manufacturing process combines integral forging with deep carburizing. The carburized layer achieves exceptional surface hardness (HRC ≥ 60) while maintaining core toughness. This unique 'hard on the outside, tough on the inside' structure enables the valve seat to withstand both high-speed abrasive scouring from mud and the intense impact forces during valve body seating without fracturing.
• Geometric locking: The valve seat bore in the hydraulic cylinder features a 1:6 taper (conicity). This precision conical surface creates a powerful self-locking force under hydraulic pressure, preventing valve seat loosening during pumping. Honghua's dedicated hydraulic valve-puller (GH3161-26.12.00) 1 is specifically designed to overcome this significant friction, ensuring no damage to the cylinder bore during maintenance.
• Diversified sealing rubber solutions: We provide valve rubber materials in various types to suit different drilling fluid systems.

Nitrile rubber (NBR): Suitable for standard water-based slurry, offering excellent oil resistance and high cost-effectiveness.

Polyurethane (PU) is engineered for high-pressure and high-abrasion applications, featuring exceptional tear resistance with a service life 2-3 times longer than conventional rubber.

Hydrogenated nitrile rubber (HNBR): Engineered for high-temperature (up to 150°C) and oil-based mud (OBM) environments, it delivers exceptional resistance to chemical aging.

The Life Game of Bimetallic and Ceramic in Cylinder Liner System

The cylinder liner is the most rapidly worn component in mud pumps. The 3NB-1300F supports a full range of cylinder liners from 7-inch to 5-inch, giving drilling engineers extensive options for displacement and pressure.

• Bi-metal liners: This is the standard configuration.

The shell is made of 45# carbon steel, which provides sufficient circumferential strength to resist the blast pressure.

Inner Sleeve: Crafted from high-chromium iron alloy (26-28% chromium content), this component is precision-cast into the housing using centrifugal casting technology, achieving an HRC 62-69 hardness. Its microstructure features dispersed chromium carbide particles that function as microscopic shields, effectively resisting abrasive rock fragments in slurry. The sleeve delivers a standard service life exceeding 800 hours.

• Zirconia Ceramic Liners: Designed for high-end users seeking maximum durability.

Material properties: Zirconia ceramics have high fracture toughness and chemical inertness. Its inner surface has high smoothness (4-8 RMS) and low friction coefficient.

Life advantage: The operating life of the ceramic cylinder liner can reach 4,000 to 10,000 hours, which is 5-10 times that of the metal cylinder liner. More importantly, it greatly extends the service life of the associated piston, reduces the replacement frequency, and is especially suitable for offshore platforms and other occasions with extremely high downtime costs.

ID ridges-free: Unlike metal cylinder liners, ceramic liners do not develop inner diameter wear ridges (ID ridges), thus preventing piston damage at the end of the stroke.

Piston and Piston Rod: The Art of Dynamic Sealing

The piston is the primary component that drives fluid to perform work. The piston core of the Honghua 3NB-1300F is made of 42CrMo forged alloy steel, heat-treated to withstand extreme bending stress.

• Seal type:

Replaceable Rubber Pistons: Economical and practical, requiring only replacement of the rubber ring when worn, while the metal core can be reused.

Bonded Urethane Pistons: Designed for high-pressure injection drilling. The polyurethane material is directly vulcanized to the metal core, eliminating seal gaps and preventing 'piston sticking.' These pistons are water-resistant, oil-resistant, and heat-resistant up to 200°F.

• Cooling lubrication: must be used with the spray pump system to forcibly water-cool the back of the piston, to remove the heat generated by friction and prevent the rubber from thermal failure.

 

 

Parameter item	Specifications	remarks
model	Honghua 3NB-1300F (HHF-1300)	three cylinder single action
rated input power	1300 HP (969 kW)	continuous duty
rated stroke	120 SPM (times per minute)	optimal efficiency interval
stroke length	12 inches (305 mm)	long stroke design
gear ratio	4.206 : 1	optimizing torque output
box size	API 7#	Standardized interface
maximum discharge pressure	5,000 PSI (34.5 MPa)	5" cylinder liner required
diameter of the cannula	12" flange (304.8 mm)	assured intake efficiency
diameter of discharge pipe	API 5-1/8" flange, 5000 PSI	High Standard
Dimensions (length × width)	4065 mm × 2505 mm (15' 1¾" × 8' 2½")	compact design
dry weight (approx.)	25,850 kg (56,990 lbs)	Includes base, excludes motor
lubricating system	Forced Lubrication + Splash Lubrication	double safeguard

 

Cylinder liner-pressure-displacement performance map (based on 120 SPM)

Cylinder liner diameter (inches)	Cylinder liner diameter (mm)	Maximum discharge pressure (PSI)	Maximum discharge pressure (MPa)	Theoretical displacement (GPM)	Theoretical displacement (L/s)	Application scenarios
7"	177.8	2786	19.2	780	49.21	Large surface boreholes with high rock-carrying capacity and low pressure
6-3/4"	171.5	2998	20.7	725	45.74	The Balance Ditching Volume and Pressure of the Second Opened Well Section
6-1/2"	165.1	3232	22.3	672	42.40	conventional drilling in the middle and deep well section
6"	152.4	3792	26.1	573	36.15	Directional drilling, requires driving downhole power drill
5-1/2"	139.7	4516	31.1	481	30.34	Deep well, small borehole, high density mud
5"	127.0	5000	34.5	398	25.11	completion operation, ultra-high pressure formation, deep well

 

Deep analysis:

• Stroke length advantage: The 3NB-1300F boasts a 12-inch (305 mm) stroke. Compared to short-stroke pumps, this longer stroke reduces the piston's reciprocation frequency at the same displacement. This directly lowers wear rates on wear-prone components (piston, cylinder liner, valve seat), improves suction efficiency, and minimizes cavitation risks.
• The pump operates across a wide pressure range of 19.2 MPa to 34.5 MPa, covering most drilling and completion operations without requiring frequent pump replacements.

 

 

To ensure the 3NB-1300F's long-term service capability in remote well sites, Honghua didn't just focus on manufacturing the equipment, but also developed a complete set of specialized maintenance tools and sealing system solutions. Using generic tools often makes disassembly difficult and may even damage expensive components.

Ecosystem of Special Tools

Each pump is equipped with the following critical specialized tools, where the Part Number ensures OEM-level precision matching.

1. Hydraulic end disassembly tool:

Hydraulic Valve-Puller (GH3161-26.12.00): A maintenance workhorse. With the valve seat and hydraulic cylinder tightly fitted at a 1:6 taper ratio, mechanical pulling is often ineffective and hazardous. This hydraulic tool delivers tens of tons of vertical pulling force, safely and 2. smoothly removing the valve seat.

Liner hoisting tool (GH3161-26.02.00): Prevents the heavy liner from slipping during installation, which could injure operators or damage threads.

Cylinder head crowbar (GH3161-26.01.00): A specially designed lever angle for easy removal of cylinder heads with high-torque locking mechanisms.

Plate remover (Flashboard puller, GH3161-26.17.00): A tool designed for rapid removal of guide plates.

2. Precision torque tools:

Socket Wrench Series: Available in multiple sizes including 2-3/8 "(GH3161-26.03),2" (GH3161-26.04), and 3-5/8" (GH3161-26.05), designed to accommodate specialized nut dimensions across pump components.

Extension rods (e.g., 19-5/8 "(GH3161-26.08) and 24" (GH3161-26.11)) are designed for tight-fitting operations in confined spaces within pump housings.

3. accessory equipment ：

Manual oil pump (SYB-2): Rated pressure 0-63 MPa, designed to power hydraulic tools without electricity or serve as an emergency lubrication supply.

Chain block (JB/T7334-94, SH1/2) is a lifting device designed to assist in hoisting heavy components.

 

Sealing Integrity System

Leakage is the primary concern for mud pumps. Honghua's seals utilize specially formulated elastomer materials to withstand oil-based mud and high temperatures.

• Key oil seals:

Double lip oil seal (Double lip oil seal, GH3161-04.07): Dimensions 5 "x6.25" x0.625", designed for intermediate tie rod sealing. Its double-lip design prevents both internal lubricant leakage and external mud ingress.

Large skeleton oil seal (GH3161-03.11) with dimensions of 9.125 "x 10.375" x 0.625", designed for high-diameter sealing at the crankshaft extension end.

• static sealing ring:

Cylinder head seal ring (GH3161-05.08): The final line of defense against 5000 PSI pulsating pressure.

Seal ring for valve pot cover (GH3161-05.12).

O-ring series: such as 190x3.55,125x7.0,200x7.0 (GB/T3452.1-2005), which are widely distributed in various flange connection surfaces.

 

 

Proper installation is the prerequisite for the long-term operation of the equipment. The 3NB-1300F has specific engineering requirements for suction conditions and ambient temperature.

Requirements of inhalation system: key to prevent cavitation

The performance of the slurry pump depends on the efficiency of its suction system.

• Inlet pipe diameter: Must match the pump's 12 inch (304.8mm) flange interface. Reducing the diameter is strictly prohibited, otherwise it will increase the flow resistance.
• Charging Pump: In most drilling operations, it is strongly recommended to install a charging pump (centrifugal pump) at the suction end of the mud pump to boost pressure. This significantly improves volumetric efficiency, eliminates cavitation-induced vibrations during high-speed pumping, and extends the service life of the valve and seat.
• Suction Dampener: The standard configuration includes a suction dampener and its rubber cell (GH3161-05.33.01). This device utilizes the compressibility of gas to absorb flow pulsations in the pipeline, stabilizing the suction liquid flow.

 

Lubrication Management: Science of Temperature and Viscosity

The lubrication system is the lifeblood of the power end. 3NB-1300F adopts a combination of splash lubrication and forced lubrication.

• Environmental temperature and oil selection:

Normal environment (+4°C to +68°C / +30°F to +155 ° F): Use AGMA 250.04EP (6EP) or ISO VG320 extreme pressure gear oil. This high viscosity oil forms a strong oil film on the gear meshing surface.

In cold environments (-18°C to +27°C / 0°F to +80°F), ISO VG220 or equivalent low-viscosity oils must be used to ensure low-temperature fluidity and prevent pump cavitation.

• For critical friction pairs (e.g., crosshead guide plate and Wrist Pin) where splash lubrication is ineffective, the gear oil pump delivers lubricating oil directly via piping. Before daily operation, always check the oil pressure gauge to confirm proper fluid flow.

 

Safety Pressure Relief System:JA-3 Shear Pin Safety Valve

As a high-pressure vessel, the 3NB-1300F discharge manifold must be equipped with a JA-3 type shear pin safety relief valve.

• Working principle: This valve utilizes the physical shear strength of the shear pin to limit maximum pressure. Unlike spring-loaded safety valves, it eliminates the risk of moving parts jamming and provides a faster, more direct response.
• Contraindications:

Prohibited substitutes: It is strictly forbidden to use iron wires, welding rods, or ordinary steel nails as replacements for the factory-calibrated shear pins. These materials have unpredictable shear strength, which may cause catastrophic accidents such as pump overpressure explosions or pipeline ruptures.

Single insertion: Only one shear pin can be inserted into a single clipboard hole.

Pressure setting: Select the shear pin with the corresponding pressure based on the current cylinder liner size. For example, when replacing with a 5" cylinder liner, a high-pressure shear pin must be used.

 

 

In today's cutthroat OEM market, the Honghua 3NB-1300F's core competitive edge lies in its extensive interchangeability.

Cross-brand compatibility

Based on extensive market feedback and third-party component catalogs, the hydraulic wear parts (cylinder liners, pistons, valve body seats, and seals) of the 3NB-1300F exhibit high interchangeability with the following mainstream international pump models:

• Bomco/Emsco: F-1300, F-1600, FB-1300
• Gardner Denver: PZ Series (Some Parts)
• National: P Series (via adapter or specific module)
• LS-NOW: 3NB Series

Strategic significance: This open-architecture design significantly boosts drilling contractors' risk resilience. During remote operations or supply chain disruptions, users can effortlessly manage hybrid inventory to keep drilling rigs running.

The Unique Value of OEM Parts

Despite the universal compatibility, we strongly recommend using Honghua's original OEM parts due to their superior tolerance control. Third-party components typically use generic tolerances, whereas Honghua, as the original equipment manufacturer (OEM), holds the proprietary' fitting tolerances' not specified in the blueprints.

• For instance, our specially ground valve seat taper features a higher Contact Area Ratio with the hydraulic cylinder bore, effectively preventing micro-wear under prolonged high-pressure conditions.
• Our 35CrMo module forgings, which have undergone targeted grain refinement heat treatment, exhibit superior impact toughness compared to standard commercial forgings.

 

 

For the convenience of the technical department to review and the purchasing department to place orders, the core components' material and technical specifications comparison table is attached.

Component Name	Reference Part Number (Ref P/N)	Core material	Process characteristics	Key technical indicators
liquid cylinder module	GH3161-05.00 series	35CrMo / 40CrMnMo Forging Alloy Steel	full forging, three stage flaw detection	F-1300 interchangeable, pressure resistant to 5000 PSI+
crank axle	GH3161-02.08.00	42CrMo alloy steel	casting/forging, hollow structure	Optimized Fatigue Strength and Eccentric Design
crosshead	Integrated component	nodular cast iron	continuous casting	Excellent self-lubrication and compressive strength
piston core	GH3161-28.03.00 (assembly)	42CrMo	heat treated forging	Anti-bending stress, compatible with various rubber materials
valve body/valve seat	API 7#	20CrMnTi / 40CrNiMo	full forging, deep carburizing	Surface hardness HRC ≥60,1:6 taper
bi-metal liner	British/Metric Series	45# steel + high chromium cast iron	centrifugal casting	Inner sleeve hardness HRC 62-69, service life>800h
ceramic cylinder liner	apolegamy	Zirconia	firing	Service life>4000h, no inner diameter ridge line
main bearing stud	AH1301010215	42CrMo	rolled thread	High tensile strength, fatigue resistance
intermediate bar seal	GH3161-04.07	special rubber	Double lip design	5"x6.25"x0.625"
relief valve	JA-3	alloy steel	shear pin mechanism	Instant full open, pressure precisely adjustable

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