Hydraulic Power Unit – 700 HP HPU
The 700 HP Hydraulic Power Unit (HPU) is a Tier 4 engine-driven system designed for maximum reliability in dredging, mining, and marine operations. Featuring an open-loop hydraulic design, advanced auto-shutoff safeguards, and an integrated cooling system, it delivers high flow rates and pressures to drive large dredge pumps and cutterheads with precision and efficiency.
Key Features / Advantages
- High Power Output – 700 HP Tier 4 diesel engine delivers the muscle needed for large-scale dredging and solids-handling projects.
- Optimized Pump Circuit – Provides up to 160 GPM @ 5000 psi, ensuring continuous and efficient dredge pump performance.
- Cutter Circuit Support – A dedicated circuit delivers up to 25 GPM at 4500 psi to power cutterheads with precision.
- Built-in Safety – Equipped with pressure and flow sensors featuring auto-shutoff to prevent costly equipment damage.
- Eco-Friendly – Runs on Phillips Powerflow NZ biodegradable hydraulic oil, minimizing environmental impact.
- Extended Runtime – Large 120-gallon fuel tank paired with an integrated cooling system for uninterrupted operation.
- Rapid Deployment – 120-ft umbilical hose bundle with ballistic nylon wrap and quick disconnects for fast setup and mobility.
- Remote Operation – Allows full monitoring and control from off-site locations, reducing workforce and downtime.
Gallery
Hydraulic Power Unit – 700 HP HPU
Technical Specifications
Performance Specifications
- Dredge Pump Circuit: Piston pump delivering up to 160 GPM at 5000 psi
- Cutterhead Circuit: Piston pump delivering up to 25 GPM at 4500 psi
- Hydraulic Cooling: Integrated cooling system for continuous-duty operation
- Filtration: High-pressure filtration with contaminant removal for system protection
- Remote Operation: Control and monitoring via a remote device
Physical Specifications
- Engine: Tier 4 700 HP engine
- Fuel Tank Capacity: 120 gallons (454 L)
- Hydraulic Oil: Phillips Powerflow NZ (environmentally friendly)
- Dimensions: 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m)
- Weight: 19,500 lbs (8,845 kg)
- Hydraulic Umbilical: 120-ft (36.58 m) hose with quick disconnects and ballistic nylon wrap
- Connections:
- Main Pump Pressure & Return: 1½-in quick disconnect
- Cutterhead Pressure & Return: ¾-in quick disconnect
- Case Drain: ¾-in quick disconnect
Required Equipment
- Compatible EDDY Pump dredge pumps or cutterheads designed for hydraulic operation
- Diesel fuel supply for Tier 4 engine
Recommended Accessories
- Additional hose assemblies for extended deployment range
- Protective hose reels or spools for safe transportation and storage of the 120-ft umbilical
- Booster pumps and discharge hose floats for long-distance pumping
- Precision dredging tools such as RTK GPS and sonar positioning systems
Comparison Table
| Specification | 125 HP HPU | 200 HP HPU | 400 HP HPU | 550 HP HPU | 700 HP HPU |
|---|---|---|---|---|---|
| Engine | Tier 4 – 125 HP | Tier 4 – 200 HP | Tier 4 – 400 HP | Tier 4 – 550 HP | Tier 4 – 700 HP |
| Hydraulic System | Open-loop | Open-loop | Open-loop | Open-loop | Open-loop |
| Pump Circuit (Dredge) | Up to 140 GPM @ 5000 psi | Up to 40 GPM @ 5000 psi | Up to 80 GPM @ 5000 psi | Up to 140 GPM @ 5000 psi | Up to 160 GPM @ 5000 psi |
| Cutter Circuit | N/A | Up to 25 GPM @ 4500 psi | Up to 25 GPM @ 4500 psi | Up to 25 GPM @ 4500 psi | Up to 25 GPM @ 4500 psi |
| Filtration | High-pressure | High-pressure | High-pressure | High-pressure | High-pressure |
| Cooling System | Integrated | Integrated | Integrated | Integrated | Integrated |
| Operation | Manual | Remote | Remote | Remote | Remote |
| Fuel Tank Capacity | 120 gal (454 L) | 120 gal (454 L) | 150 gal (568 L) | 200 gal (757 L) | 120 gal (454 L) |
| Hydraulic Oil | Phillips Powerflow NZ (Eco-Friendly) | Same | Same | Same | Same |
| Umbilical Hose | 120 ft (36.58 m) with quick disconnects, ballistic nylon wrap | Same | Same | Same | Same |
| Dimensions (L x W x H) | 96” x 56” x 72” (2.44 m x 1.42 m x 1.83 m) | 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) | 12’ x 5’ x 6’ (3.66 m x 1.5 m x 1.83 m) | 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) | 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) |
| Weight | 5,500 lbs (2,495 kg) | 9,000 lbs (4,082 kg) | 12,500 lbs (5,670 kg) | 16,000 lbs (7,257 kg) | 19,500 lbs (8,845 kg) |
| Hydraulic Connections | 1” main lines, ¾” case drain | 1½” main lines, ¾” cutter & case drain | 1½” main lines, ¾” cutter & case drain | 1½” main lines, ¾” cutter & case drain | 1½” main lines, ¾” cutter & case drain |
Industries Served
Dredging & Marine Construction
The 700 HP HPU provides the hydraulic muscle required to power large dredge pumps and cutterheads used in ports, rivers, lakes, and coastal waterways. Its high-pressure circuits ensure efficient sediment removal and channel deepening while maintaining continuous operation in challenging marine conditions.
Mining Operations
Designed for heavy-duty slurry transport, the HPU drives large hydraulic pumps that move abrasive tailings, overburden, and high-density slurry. With its rugged construction and eco-friendly hydraulic oil, it supports 24/7 mining operations while reducing downtime caused by equipment failures.
Municipal Wastewater & Infrastructure
Municipalities rely on hydraulic dredge systems powered by the HPU for lagoon dredging, sediment removal, and maintenance of wastewater treatment plants. Remote operation capabilities enable safe deployment in hazardous or restricted-access environments, thereby improving efficiency and enhancing worker safety.
Oil & Gas Industry
Offshore and onshore projects use the 700 HP HPU to support hydraulic power needs for dredging around platforms, trenching for pipelines, and high-volume slurry pumping. Its Tier 4 engine and environmentally friendly hydraulic oil help operators stay compliant with strict environmental and emission standards.
Industrial Processing & Heavy Manufacturing
Facilities dealing with bulk material movement, chemical slurries, or abrasive byproducts benefit from the HPU’s ability to drive large hydraulic pumps. Its integrated cooling system supports continuous operation in industrial environments where uptime and reliability are critical.
Agriculture & Irrigation
The HPU supports canal dredging, sediment removal, and large-scale irrigation projects. By powering hydraulic pumps for slurry and water transport, it ensures uninterrupted flow in agricultural operations, minimizing downtime during critical irrigation cycles.
Environmental Remediation
For contaminated site cleanup, riverbed restoration, and wetland maintenance, the HPU powers precision dredging equipment equipped with GPS and sonar. Its use of eco-friendly hydraulic oil reduces the risk of secondary contamination in sensitive ecosystems.
Offshore Wind Farm Installation Support
Case Study
Challenge
A European offshore construction contractor was tasked with trenching subsea power cables for a new wind farm located 20 miles off the coast. The seabed consisted of compacted sand and clay, requiring powerful hydraulic systems to achieve the necessary trench depth. Traditional dredging equipment could not deliver the sustained power or precision needed, and project delays would have risked multi-million-dollar penalties.
Solution
The contractor deployed the EDDY Pump’s 700 HP Hydraulic Power Unit (HPU) to drive a high-capacity dredge pump and cutterhead system mounted on a subsea sled. The HPU’s open-loop hydraulic design and 160 GPM @ 5000 psi dredge circuit provided the consistent pressure needed to cut through dense seabed material. Integrated cooling enabled continuous duty operation, while RTK GPS guidance, combined with remote HPU monitoring, ensured precise trenching along the designated cable route, even in strong offshore currents.
Result
The subsea trenching was completed two weeks ahead of schedule, enabling cable laying and turbine commissioning to proceed without delays. The project achieved a 20% reduction in operational costs, thanks to minimized downtime and increased productivity. In addition, the use of biodegradable Phillips Powerflow NZ hydraulic oil helped the contractor meet strict offshore environmental standards, reinforcing their reputation as a sustainable energy partner.
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If you need assistance with pump selection, sales or engineering support, call 619-404-1916.
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Frequently Asked Questions
What is the primary purpose of the 700 HP Hydraulic Power Unit?
The 700 HP HPU is built to provide high-pressure hydraulic power for large-scale pumping and dredging operations. It is most commonly used to drive EDDY Pump dredge systems and cutterheads in applications such as harbor deepening, tailings management, and offshore trenching. Its heavy-duty Tier 4 diesel engine and open-loop design make it suitable for continuous operation under the harshest working conditions.
What flow and pressure does the hydraulic power unit 700 HP circuit deliver?
The dredge pump circuit is engineered to deliver up to 160 GPM at 5000 psi, giving it the capacity to power large dredge pumps for moving dense slurries, abrasive sediments, or overburden materials. This ensures operators can achieve higher production rates and longer pumping distances without sacrificing efficiency or safety.
Can the HPU also power cutterheads in addition to dredge pumps?
Yes. The 700 HP hydraulic power unit for dredging features a dedicated cutterhead circuit capable of delivering up to 25 GPM at 4,500 psi, enabling operators to simultaneously power mechanical cutterheads. This dual functionality enables more effective sediment disintegration and improves overall slurry flow, especially when dealing with compacted or consolidated material.
How does the system protect against equipment damage or operational failure?
The industrial hydraulic power unit integrates pressure and flow monitoring sensors with automatic shut-off capabilities. If pressure spikes or abnormal flow conditions occur, the system immediately halts operation to prevent damage to the pump, cutterhead, or hydraulic system. These built-in safeguards minimize costly downtime and extend the equipment’s lifespan.
What features make this 700 HP hydraulic power unit environmentally responsible?
The 700 HP HPU is designed with sustainability in mind. It operates on Phillips Powerflow NZ hydraulic oil, a biodegradable, non-toxic fluid that is safe for marine and sensitive environments. Combined with a Tier 4-certified diesel engine, the HPU meets modern emission regulations and helps contractors comply with environmental standards for both land and water projects.
What are the physical specifications of the unit?
The 700 HP heavy duty HPU for industrial applications has a compact but heavy-duty footprint, measuring 13’ x 5’ x 8’ (3.96 m x 1.5 m x 2.43 m) and weighing approximately 19,500 lbs (8,845 kg). It is equipped with a 120-gallon (454 L) fuel tank for extended runtime and a 120-ft hydraulic umbilical hose bundle with ballistic nylon wrap for durability and safe handling.
Can the 700 HP hydraulic power unit be operated remotely?
Yes. The 700 HP HPU is designed for remote monitoring and control, allowing operators to manage functions such as pressure, flow, and circuit operation from a control room or vessel. This reduces on-site workforce requirements and increases safety when working in hazardous or offshore environments.
What types of projects typically require a 700 HP HPU?
This heavy-duty hydraulic power unit is ideal for large-scale dredging projects, offshore cable trenching for wind farms, mining tailings removal, wastewater lagoon dredging, coastal reinforcement projects, and heavy industrial pumping applications. Essentially, it is deployed wherever maximum hydraulic power, reliability, and continuous operation are critical.
How is the 700 HP hydraulic power unit deployed and connected in the field?
Deployment is streamlined with the included 120-ft hydraulic umbilical hose bundle, which features quick-disconnect fittings and ballistic nylon protection for ease of transport and setup. Connections include 1½-in quick disconnects for the main pump, ¾-in for the cutterhead circuit, and ¾-in for case drains, ensuring fast integration with dredge pumps and attachments.
What accessories are recommended to optimize performance during extended operations?
Operators often enhance performance with booster pumps for extended discharge lines, discharge hoses and floats for safe slurry transport, hose reels for umbilical management, and precision dredging equipment such as RTK GPS and sonar systems. These accessories enhance efficiency, extend operational range, and provide real-time data for precise dredging control.
HD (Heavy Duty) Slurry Pumps / Dredge Equipment
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