Underwater demolition and rock breaking are among the most challenging applications for hydraulic breakers. Projects such as navigation channel deepening, underwater rock excavation, bridge pier and wharf demolition, coastal infrastructure construction, and foundation removal require equipment that can operate reliably in environments with limited visibility, water pressure, corrosion, and difficult access.
A standard hydraulic breaker should not be submerged without appropriate modifications and protection. Water entering the internal impact mechanism can lead to corrosion, inadequate lubrication, component damage, and premature equipment failure.
For underwater applications, a hydraulic breaker should be equipped with a dedicated underwater configuration and an external compressed-air system. Proper equipment selection, air-pressure management, operating procedures, and post-operation maintenance are essential for maintaining performance and extending service life.
This guide explains the basic working principle, recommended operating procedures, equipment configuration, and BEILITE underwater hydraulic breaker solutions for professional underwater applications.
How Does an Underwater Hydraulic Breaker Work?
The main challenge when operating a hydraulic breaker underwater is preventing water from entering the internal impact mechanism.
During normal operation, the piston moves rapidly inside the breaker body and transfers impact energy to the tool. When the breaker is submerged, surrounding water can enter the internal area through gaps around the tool if the breaker is not properly configured for underwater use.
Water ingress may result in:
- Internal corrosion
- Lubrication loss
- Premature wear of internal components
- Hydraulic or mechanical lock
- Reduced impact performance
- Increased maintenance requirements
To address these challenges, a professional underwater hydraulic breaker system uses positive-pressure compressed air.
Compressed air is continuously introduced into the breaker through a dedicated air supply passage. The resulting positive pressure helps prevent water, mud, and other contaminants from entering the critical internal areas around the piston and tool.
For this reason, underwater operation is not simply a matter of lowering a standard breaker into the water. The breaker, air supply system, carrier, hydraulic circuit, and operating procedures should be considered as one complete system.
BEILITE 3-in-1 Underwater Air Supply System
A reliable compressed-air supply is an important part of an underwater hydraulic breaker configuration. BEILITE recommends a three-stage air supply system consisting of an air compressor, cold dryer, and high-pressure air storage tank.
1. Air Compressor
The air compressor provides the compressed air required to maintain positive pressure inside the underwater breaker.
The compressor should be selected according to the breaker model, operating depth, required air flow, and project conditions. Stable air delivery is important because insufficient pressure may reduce the effectiveness of the underwater protection system.
2. Cold Dryer
Compressed air may contain moisture. A cold dryer removes moisture from the compressed-air system before the air enters the breaker.
This helps reduce the risk of internal condensation and corrosion, particularly during long-term underwater operations or when working in marine environments.
3. High-Pressure Air Storage Tank
The storage tank provides a buffer between the compressor and breaker.
It helps stabilize air delivery and reduce pressure fluctuations during operation. A stable compressed-air supply allows the underwater protection system to maintain consistent positive pressure.
Together, these three components provide a more stable and controlled air supply for underwater hydraulic breaker applications.
Standard Operating Procedures for Underwater Applications
Proper operating procedures are essential for protecting both the breaker and excavator. BEILITE recommends dividing underwater operations into three stages: pre-submersion inspection, submerged operation, and post-operation maintenance.
Phase 1: Pre-Submersion Inspection
Before the hydraulic breaker is submerged, conduct a complete inspection and dry-state test.
Check Hydraulic Connections
Inspect hydraulic hoses, fittings, adapters, and connections for leakage, damage, or abnormal wear.
Any hydraulic leakage should be corrected before the breaker enters the water.
Check the Air Supply System
Confirm that the dedicated underwater air passage is correctly connected and free from blockage.
Start the compressor and verify that compressed air is reaching the designated areas of the breaker. Air flow and pressure should be checked before beginning underwater work.
Check the Lubrication System
Adequate lubrication is particularly important during underwater operation.
Because manual lubrication is difficult or impossible while the breaker is submerged, an automatic lubrication system can provide a more consistent supply of grease to the required components.
Before operation, verify that the lubrication system is functioning correctly and that the grease supply is sufficient.
Check the Carrier and Pipeline
The excavator should be equipped with the appropriate hydraulic and air pipelines along the boom.
Flow and pressure controls should be installed in a position that allows the operator to monitor the system conveniently from the cab.
For extended-boom or deep-water applications, pressure monitoring equipment should preferably be accessible from the operator's position.
Phase 2: Submerged Operation and Pressure Management
Water pressure increases with depth. Therefore, compressed-air pressure must be adjusted according to the operating depth and actual project conditions.
As a general operating principle, the air pressure should be maintained sufficiently above the surrounding water pressure to maintain positive pressure within the breaker.
A preliminary reference range is shown below:
| Operating Depth | Recommended Compressed-Air Pressure* |
|---|---|
| 0–5 m | 1.0–2.0 bar |
| 5–10 m | 2.0–3.0 bar |
| 10–15 m | 3.0–4.0 bar |
*The values above are general reference ranges. Actual air pressure requirements should be determined according to the breaker configuration, operating depth, air system capacity, water conditions, and manufacturer's technical recommendations.
Avoid Excessive Air Pressure
Higher air pressure does not necessarily mean better underwater performance.
If the pressure is excessive, compressed air may cause excessive grease displacement or increase the risk of lubrication loss. Operators should therefore monitor the air pressure continuously and adjust it according to actual operating conditions.
Minimize Blank Firing
Underwater work often involves limited visibility. The operator may not be able to clearly observe the contact point between the tool and the material being broken.
Blank firing can generate unnecessary impact loads and may increase stress on the breaker, excavator boom, and arm.
For demanding underwater applications, an anti-blank-fire system can provide additional protection by helping prevent repeated empty strikes.
Monitor Excavator Stability
Underwater breaking with an extended boom changes the working geometry and load distribution of the excavator.
Operators should consider:
- Excavator operating weight
- Boom and arm configuration
- Breaker weight
- Working depth
- Water resistance
- Breaking angle
- Ground and foundation conditions
The excavator and breaker should be configured as a complete working system rather than selected independently.
Phase 3: Post-Operation Maintenance
Post-operation maintenance is particularly important after underwater work. Salt water, mud, and moisture can accelerate corrosion if they remain on or inside the breaker.
Maintenance should be performed as soon as possible after the breaker is removed from the water.
1. Wash the Breaker with Fresh Water
After marine or contaminated-water applications, thoroughly rinse the external surfaces of the breaker with fresh water.
This helps remove salt deposits, mud, sediment, and other contaminants that could accelerate corrosion.
2. Remove Internal Moisture
Keep the air supply connected after the breaker is removed from the water and use compressed air to help remove residual moisture from the internal areas.
The objective is to ensure that the internal mechanism is thoroughly dried before the equipment is stored or returned to normal operation.
3. Apply Rust-Preventive Oil
For applications requiring additional corrosion protection, rust-preventive oil or suitable hydraulic oil can be introduced through the air supply system according to the manufacturer's maintenance procedure.
BEILITE recommends following the specific maintenance instructions provided for the applicable underwater breaker model, including the recommended oil type and quantity.
Proper drying and corrosion prevention can significantly reduce the risk of internal rust and help maintain the breaker's service condition between underwater operations.
How to Select the Right Underwater Hydraulic Breaker
Selecting an underwater hydraulic breaker requires more than matching the breaker to the excavator's tonnage.
Professional selection should consider several factors:
1. Excavator Operating Weight
The breaker must be compatible with the excavator's operating weight and hydraulic system.
An oversized breaker can negatively affect carrier stability and hydraulic performance, while an undersized breaker may not provide sufficient impact energy for the application.
2. Hydraulic Flow and Pressure
The excavator's auxiliary hydraulic circuit should meet the breaker's required flow and working-pressure range.
Before purchasing, verify:
- Hydraulic oil flow
- Operating pressure
- Return-line back pressure
- Hose and pipeline specifications
- Auxiliary valve configuration
3. Operating Depth
Water depth directly affects hydrostatic pressure and therefore the requirements of the compressed-air protection system.
Projects at greater depths generally require more careful pressure management and system configuration.
4. Material to Be Broken
The type and hardness of the material also influence breaker selection.
Different applications may involve:
- Rock
- Reinforced concrete
- Concrete foundations
- Bridge structures
- Wharf structures
- Riverbed deposits
- Underwater bedrock
The required impact energy and tool configuration should be selected according to the material and production requirements.
5. Working Environment
Freshwater and marine environments present different corrosion challenges.
For projects involving seawater, additional attention should be given to corrosion protection, cleaning procedures, lubrication, and post-operation maintenance.
BEILITE Underwater Hydraulic Breaker Range
BEILITE offers a range of hydraulic breakers that can be configured for underwater applications, including:
BLTB-100 / BLTB-125 / BLTB-135 / BLTB-140 / BLTB-150 / BLTB-155 / BLTB-165 / BLTB-175 / BLTB-195 / BLTB-200 / BLTB-210 / BLTB-230
The appropriate model depends on the excavator, hydraulic system, material, working depth, and project requirements.
For engineering projects with special operating conditions, BEILITE can evaluate the carrier and working environment and recommend a suitable breaker configuration.
Heavy-Duty Application: BLTB-210 for 90-Ton-Class Excavators
For a 90-ton-class excavator equipped with an extended boom and operating at approximately 15 meters underwater, the BEILITE BLTB-210 can be considered as a suitable heavy-duty configuration, subject to confirmation of the carrier's hydraulic specifications and project requirements.
The BLTB-210 is designed for demanding breaking applications where high impact performance and structural durability are required.
Key considerations include:
Impact Performance
The breaker is designed to deliver consistent impact energy for challenging materials such as underwater rock and concrete structures.
Structural Durability
Heavy-duty construction helps the breaker withstand the mechanical loads associated with demanding excavation and demolition applications.
Compatibility with Heavy Excavators
The breaker should be matched with the excavator's operating weight, hydraulic flow, boom configuration, and working geometry to achieve an appropriate balance between breaking performance and carrier stability.
BEILITE Underwater Application Cases
BEILITE underwater hydraulic breakers have been used in river engineering and underwater rock-breaking projects.
Liujiang River Deepening Project – 2021
A BEILITE BLTB-210 was paired with a SANY 650 excavator for underwater channel deepening and rock-breaking work.
Yujiang River Renovation Project – 2022
A BEILITE BLTB-175 was deployed with a Caterpillar CAT 349 excavator for underwater construction and demolition applications.
Hongshui River Deepening Project – 2022
A BEILITE BLTB-210 was mounted on a Liugong 990 excavator and used for underwater foundation-rock breaking in challenging working conditions.
These projects demonstrate the importance of combining the correct breaker configuration with an appropriate carrier, compressed-air system, and operating procedure.
Why Choose BEILITE for Underwater Hydraulic Breaking?
Underwater hydraulic breaking requires specialized engineering rather than a standard breaker configuration.
BEILITE provides solutions covering the hydraulic breaker, underwater air system, lubrication, carrier compatibility, and application requirements.
Our approach focuses on:
- Appropriate breaker selection
- Positive-pressure underwater protection
- Stable compressed-air supply
- Anti-blank-fire protection
- Automatic lubrication options
- Carrier and pipeline configuration
- Application-specific technical support
- Maintenance and service guidance
By evaluating the excavator, operating depth, material, working environment, and project requirements together, we help customers develop a practical underwater breaking solution.
Conclusion
Underwater hydraulic breaker applications require careful preparation, appropriate equipment configuration, and disciplined maintenance.
A professional underwater system should include a properly configured hydraulic breaker, positive-pressure air supply, suitable air treatment and storage equipment, appropriate carrier piping, reliable lubrication, and effective operating controls.
The most important considerations are not simply breaker size or impact energy. Operating depth, water pressure, excavator compatibility, material characteristics, air pressure, and maintenance requirements all influence the overall performance and service life of the equipment.
BEILITE offers a range of underwater hydraulic breaker configurations for river engineering, marine construction, underwater demolition, channel deepening, and rock-breaking applications.
If you are planning an underwater breaking project, contact BEILITE's technical team with your excavator model, operating weight, hydraulic flow and pressure, working depth, material type, and project environment. Our team can evaluate these parameters and recommend an appropriate underwater hydraulic breaker configuration for your application.
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