Halliburton HT-400 Pump

The Power End of the HT-400™ is the conversion hub that transforms the engine's rotational mechanical energy into hydrostatic pressure. Its design philosophy centers on the core metric of' high power density.' By optimizing the structure with precision, our engineers have achieved stable output support up to 800 horsepower (HHP) while maintaining weight limits for helicopter hoisting or compact vehicle installation.

The Box Structure: The Victory of Welding Technology

Unlike conventional cast iron enclosures, the HT-400™ features a high-strength steel welded structure (Weldment) for its power unit housing. This design choice is deliberate, grounded in a thorough understanding of fatigue fracture mechanics.

• Fatigue resistance: The pump body is subjected to intense cyclic loads during fracturing and cementing operations. High-strength steel plates, after precision welding and heat treatment, eliminate internal stresses. Compared to cast structures, they exhibit greater toughness under tensile and shear stresses, significantly reducing the risk of shell cracking.
• Lightweight advantages: The welded structure enables engineers to reduce material thickness in non-load-bearing areas while reinforcing critical load-bearing points like the bearing housing. This allows the HT-400™ to maintain exceptional structural rigidity while keeping its dry weight between 5,500 and 6,500 pounds (2,500–2,950 kg), depending on gearbox configuration. This is particularly crucial for offshore platforms or helicopter transport to remote well sites.
• Left-Right Drive Configuration: Designed to accommodate the complex manifold layouts of modern cementing trucks and fracturing rigs, the HT-400™ housing offers both left-hand and right-hand drive configurations. This mirror design enables twin-pump skid installation, optimizing space utilization while simplifying drive shaft connections. Notably, although internal rotating components are generally interchangeable, the housing itself is non-interchangeable due to variations in bearing hole positions and mounting feet.

Gear Transmission System: Precision Reduction and Torque Amplification

The heart of power transmission lies in its worm gear reduction mechanism. The HT-400™ employs this design instead of spur or bevel gears, primarily because worm gears offer exceptional single-stage reduction ratios and smooth operation, effectively absorbing the pulsating shocks from the plunger's reciprocating motion. We provide two premium gear set configurations tailored to different operational requirements:

1. Holroyd gear set (8.6:1 reduction ratio)

• Design features: This is a single-enveloping gear design. The hardened steel worm drives a centrifugally cast phosphor-bronze gear ring.
• Application Scenario: This configuration delivers a rated input power of 600 BHP (brake horsepower), making it the go-to choice for cementing and acidizing operations. The Holroyd tooth profile's meshing characteristics provide exceptional low-speed control, which is essential for operations requiring precise cement discharge management.
• Materials Science: The tooth ring is made of special bronze alloy with excellent friction reduction and anti-caking ability. Under the condition of boundary lubrication, the bronze as the sacrificial material can effectively protect the expensive steel worm gear from wear.

2. Cone Drive gear set (8.4:1 reduction ratio)

• Design Features: The advanced Double-Enveloping design features a hourglass-shaped worm that encircles the gear's curvature, significantly increasing the number of teeth engaged simultaneously.
• Application scenario: The rated input power is increased to 800 BHP. This high load capacity makes it an ideal choice for high-load, long-term continuous operation conditions such as hydraulic fracturing and coiled tubing operations.
• The advantages of the new tooth are as follows: the increased contact area can disperse the pressure on the tooth surface, greatly reduce the contact stress, prolong the fatigue life, and withstand the instantaneous pressure spikes in the fracturing operation.

Crankshaft and connecting rod assembly: the precision heart of motion conversion

The conversion from rotation to reciprocating motion occurs in the crankshaft and connecting rod mechanism, which is the most concentrated area of mechanical stress.

• Forged Crankshaft: The HT-400™ crankshaft is forged from high-quality alloy steel and undergoes full heat treatment with surface hardening. Its three crankshafts are arranged at 120-degree phase angles, and this three-cylinder design optimizes fluid dynamics for uniform flow, significantly reducing pressure fluctuations in the exhaust manifold. The crankshaft is supported by four main bearings-two outer and two inner. This four-point support structure minimizes bending deformation under heavy loads, ensuring even stress distribution across the connecting rod bearings.
• Forged aluminum connecting rod: This is a critical engineering choice. The HT-400™ employs high-strength forged aluminum alloy connecting rods instead of conventional steel ones.

.Inertia advantage: Aluminum's density is only one-third of steel's. At input speeds up to 2,400 RPM, reducing the reciprocating inertia mass of the connecting rod significantly decreases impact loads on the crankshaft and bearings, thereby improving mechanical efficiency.

.Heat management: The excellent thermal conductivity of aluminum alloy can help to quickly transfer the frictional heat generated by the crank pin bearing, and prevent the bearing from overheating and failure.

.Failure protection: In the extreme lubrication failure, the aluminum connecting rod will melt or break before the forged steel crankshaft, acting as a "mechanical fuse", thus protecting the more valuable crankshaft and box from being completely destroyed.

• Crosshead and Guide Plate: The cast steel crosshead moves reciprocally along the steel slides, guided by two replaceable bronze shoes. The slides are secured within the housing by an innovative expanding clamp mechanism. This design enables maintenance personnel to replace the slides without disassembling the crankshaft, while allowing precise control of the crosshead's running clearance (standard range: 0.006-0.012 inches) through shim adjustments, effectively preventing wear-induced misalignment.

Lubrication System: Dry Oil Pan and Forced Lubrication

The HT-400™ features a wet sump lubrication system, with lubricating oil stored directly at the bottom of the worm gear box.

• Built-in oil pump: A crescent gear pump is directly driven by the worm shaft. This design ensures the oil flow rate is proportional to the pump's rotational speed, guaranteeing full lubrication of critical friction pairs under all operating conditions.
• Oil circulation system: Lubricating oil is drawn from the oil pan and first passes through a tubular heat exchanger (using engine coolant or seawater for temperature regulation) to maintain optimal viscosity (typically above 40°F/4.4°C for starting, with high-temperature control during operation). The oil then flows through a Schroeder magnetic filter and a 25-micron fine filter.
• Filter Protection: The magnetic filter captures iron filings from gear wear, while the paper filter removes other particulate contaminants. The system's bypass valve ensures uninterrupted oil flow when the filter becomes clogged or the cold-start oil viscosity is too high, even if this temporarily reduces filtration efficiency to protect the mechanical components.
• Key lubrication points: The pressure oil is delivered to the crosshead raceway, worm thrust bearing, crankshaft main bearing, and lubricates the big end of the connecting rod via the internal oil passage of the crankshaft. The crosshead pin (Wrist Pin) receives splash lubrication or pressure lubrication through the drilled oil passage inside the connecting rod.

The hydraulic end, the frontline of pumping operations, directly faces challenges of high pressure, corrosion, and wear. The HT-400™ hydraulic end features a modular three-cylinder design, with each plunger paired with a separate forged steel pump head. This modular design significantly reduces maintenance costs-should a cylinder be eroded, users only need to replace that specific cylinder without scrapping the entire hydraulic end.

Structure: Standard and HCLE

To accommodate diverse working media, we have developed two primary flow channel geometries:

1. Standard Fluid End:

• Structure: The cross-bore design is adopted, and the suction valve and discharge valve are arranged vertically.
• Advantages: The design is compact, the dead volume is small, and the volume efficiency is high.
• Applicability: Very suitable for cementing, acidizing and general fluid pumping. It is the most economical and efficient choice for clean fluids or low sand ratio operations.
• Specifications: Compatible with various plunger sizes including 3-3/8 ", 4", 4-1/2 ", 5", and 6", with a maximum pressure capacity of 20,000 psi.

2. The HCLE (High Sand Ratio Low Erosion) hydraulic end:

• Structure: The design adopts either a "T-shaped hole" or straight-through configuration. The intake valve and exhaust valve are optimally arranged in terms of fluid dynamics, typically aligned in a straight line or with a smooth transition.
• Advantages: It significantly reduces the turbulence and vortex of the fluid in the pump cavity, thus reducing the erosion wear of the pump body by high-speed sand-containing fluid (Washout).
• Applicability: Specifically engineered for hydraulic fracturing (Frac), particularly in demanding conditions involving high-concentration proppants. It significantly extends the service life of the pump head when transporting abrasive slurries.

Core Materials and Manufacturing Processes

As an OEM, Halliburton maintains near-perfect material selection standards to ensure every component can withstand extreme operating conditions.

• The material of the pump head body (4330V forged steel):

.We mainly choose AISI 4330V (vanadium modified nickel-chromium-molybdenum alloy steel) as the material of the hydraulic end pump head.

.Technical Advantages: 4330V steel demonstrates superior hardenability and impact toughness compared to standard 4140 steel. Our manufacturing process employs vacuum degassing technology to minimize hydrogen content and non-metallic inclusions in the steel, which is critical for preventing fatigue crack initiation under high-pressure conditions.

.Autofrettage: All high-pressure hydraulic units undergo autofrettage prior to precision machining. By applying ultra-high pressure to the inner cavity, the metal walls undergo plastic deformation, leaving residual compressive stress after pressure release. This pre-stress effectively counteracts the tensile stress generated during pumping, extending the pump's fatigue life by several times.

• Valves and Seats:

.Materials: The material is made of SAE 8620 or 20CrMnTi high grade carburized steel.

.Heat treatment: After deep carburizing and quenching, the surface hardness reaches HRC 58-62, exhibiting exceptional wear resistance. The core maintains HRC 30-40 toughness to withstand the massive impact loads from hundreds of valve seat impacts per minute, preventing brittle fracture.

.Design details: The valve seat's outer circumference is typically designed with a taper (e.g., 1:4 or similar ratio), which relies on a wedge effect to achieve self-locking sealing under high pressure. An O-ring is also included to prevent washout.

• Plunger:

.Colmonoy® Coating: The standard plunger features a steel base with a spray-welded layer of Colmonoy® 88 or a similar nickel-based superalloy. This chromium, boron, silicon, and tungsten alloy is deposited onto the base through spray welding, achieving a hardness of HRC 60+. The coating is not only wear-resistant but also highly corrosion-resistant to saltwater and acids due to its high nickel content.

.Ceramic Plugs: For extreme corrosive or highly abrasive environments, we provide zirconia ceramic plugs. Despite their higher cost and thermal shock sensitivity, these plugs feature an exceptionally smooth surface and low friction coefficient, significantly extending packing life.

Spacer component

The isolation frame is the bridge connecting the power end and the hydraulic end, and its open design is very important.

• Function: It provides an observation window, allowing operators to visually inspect the plunger seal (packing) for leaks. More importantly, it physically isolates the two components, preventing corrosive fracturing fluids or cement slurry from entering the power-side crankcase emulsified lubricating oil, thus avoiding catastrophic power-side failures.
• model ：

1. The L-2 model features a welded structure for enhanced durability, typically used in 800HP fracturing configurations.
2. The L-4 type, featuring 12 independent support pipes bolted together, is a lightweight design commonly used in 600HP cementing configurations.

The HT-400™ demonstrates remarkable versatility through its extensive performance range. By switching to plunger diameters of varying sizes, operators can seamlessly transition between maximum pressure and maximum displacement. This single pump can perform both high-pressure testing at 20,000 psi and large-volume water injection operations.

Performance data sheet (based on 8.6:1 gear ratio, 2,100 RPM engine speed)

Note: The data is calculated based on a 90% volumetric efficiency. The maximum input power is limited to 600 BHP (Holroyd gear) or 800 BHP (Cone Drive gear).

Physical dimensions and weight

The compact design of HT-400™ allows seamless integration into various vehicle-mounted or skid-mounted systems.

• Length: Approximately 56 to 77 inches (1,422-1,956 mm), depending on whether a spacer is installed and the type of hydraulic end.
• Width: approximately 50 inches (1,270 mm).
• Height: approximately 47 inches (1,194 mm).
• Dry weight: Approximately 5,500 pounds (2,500 kg) to 6,500 pounds (2,950 kg). Compared to the Quintuplex pump of the same class, it offers a significant weight advantage, reducing transportation costs and chassis load.

As an OEM manufacturer, we understand that equipment reliability depends not only on design, but also on proper maintenance and high-quality components. This chapter provides core maintenance strategies based on the HT-400™ Pump Maintenance and Repair Manual.

Sealing system: packing and sealing

High pressure seal is the most frequently replaced consumables in pump operation.

• Packing Assembly:

1. The header ring, typically made of HNBR or bronze, is positioned at the base of the packing assembly to provide structural support.
2. Pressure Rings: The core sealing element. For standard operating conditions, we recommend a composite of nitrile rubber and cotton fabric. For acidic or high-temperature environments, we recommend Kevlar®-reinforced HNBR or fluororubber (Viton), or even PEEK to withstand chemical erosion and high-temperature creep.
3. Female Adapter: A top pressure ring prevents the sealing material from being extruded under high pressure.

• Lubrication seal: Located inside the stuffing box nut, it ensures the plunger lubricant remains in the packing area to prevent dry friction.
• Maintenance Note: When installing new packing, perform a break-in. Use clean water and gradually increase pressure to 2,000 psi in 2000 psi increments. Maintain each pressure level for 20-30 minutes, adjusting the packing gland until reaching operating pressure. Never lock the packing gland all at once, as this may cause overheating and burnout.

Valve system assembly: valve body and rubber

• Valve Inserts: They form the first line of defense for valve sealing.

1. Polyurethane: Standard red or brown rubber, suitable for water-based slurry and cement, with excellent wear resistance and an upper operating temperature of approximately 160°F (71°C).
2. High-temperature compound: Yellow or white rubber, suitable for oil-based slurry or acid solutions at temperatures up to 200°F+.

• Spring: Stainless steel springs must be used to prevent corrosion and breakage. Note the installation direction of the conical spring for 5 "and 6" pump heads: the smaller end must face the plunger. Otherwise, the valve may not open fully.

Recommended Spare Parts List (RSPL)

To handle emergencies in remote areas, we recommend clients always carry the following essential spare parts kits:

1. Fluid end consumables package: includes complete set of Vane rubber, Vane spring, packing set, O-ring and Vane cover sealing pad.
2. The spare parts are a set of spare valve body and valve seat, and a spare plunger.
3. Power unit maintenance kit: Schroeder filter cartridge, gearbox cover gasket, and worm shaft oil seal.

Part Number Index (Example)

To help customers find parts, we list the reference numbers for some high-frequency and wear-prone components below:

• 4.5" Varnish rubber (standard polyurethane): Legacy No.316.22049
• 4.5" Verge (conical): Legacy No.316.22047
• Schroeder filter cartridge: SAP No.100021412 (K-25)
• Power end large cover seal: SAP No.100002810

Hot Tags: halliburton ht-400 pump, China halliburton ht-400 pump manufacturers, suppliers, factory