280 MPa Ultra-High Pressure Hose: DN8 – The Hardcore Tool for Ship Cleaning & Hydraulic Demolition

 1. Product Positioning: DN8, 280 MPa – Extreme Performance

The 280 MPa ultra-high pressure hose is a premium product designed for ultra-high pressure water jet applications, playing an irreplaceable role in ship cleaning, concrete demolition, and water jet cutting. Its nominal bore is DN8 (8 mm) , actual ID range 7.6 – 8.1 mm, and lengths up to 20 meters are available. It meets diverse operational needs from ship hull coating removal to reinforced concrete demolition. The 2,800 bar (40,600 psi) working pressure far exceeds conventional hydraulic hoses, making this hose the core conveying element of ultra-high pressure water jet systems.

2. Structural Breakdown: Three Layers of Hardcore Protection

The extreme pressure capacity of the 280 MPa ultra-high pressure hose comes from its precision multi‑layer construction:

• Inner Tube: Made of polyoxymethylene (POM) or ultra‑wear‑resistant polyurethane, offering excellent chemical resistance and low friction. It effectively resists erosion from high‑speed water jets, with a smooth bore that minimizes fluid resistance.

• Reinforcement: 6 to 8 layers of high‑tensile steel wire spirally wound – the core that withstands 280 MPa. The multi‑layer spiral design provides superior burst resistance and impulse durability compared to braided constructions, ensuring stable performance under frequent pressure fluctuations.

• Outer Cover: Nylon (polyamide) or ultra‑wear‑resistant polyurethane, abrasion‑resistant, weather‑resistant, and chemical‑resistant. It protects the internal steel wires from mechanical damage and environmental attack. Typical outer diameter is 19 – 23 mm.

3. Performance Advantages: Ultra‑High Pressure, Long Life & Safety Margin

• Working Pressure: 280 MPa (2,800 bar / 40,600 psi)

• Burst Pressure: 700 MPa (2.5 times working pressure), compliant with DIN EN 1829‑2 safety standards, providing legally recognized operator protection.

• Temperature Range: -10°C to +70°C, suitable for most industrial environments worldwide.

• Minimum Bend Radius: down to 230 mm – flexible enough for complex, tight spaces such as ship cabins and bridge inspection holes, while maintaining high pressure capability.

• Continuous Length: seamless long‑length construction (up to 20 m) reduces the number of couplings, significantly lowering leak risks.

• Coupling: Use of pull‑proof specially designed hose couplings achieving near‑zero leakage, ensuring total assembly safety.

4. Applications: Ship Cleaning & Hydraulic Demolition

Ship ultra‑high pressure cleaning is a core application. With a 20‑meter length, the hose easily covers large hull areas for rust and paint removal. The hose delivers pure water at ultra‑high pressure through special nozzles, creating high‑speed water jets that efficiently remove rust, old coatings, and marine fouling. The process is environmentally friendly – an ideal alternative to traditional grit blasting.

Hydraulic concrete demolition is another key application. Using ultra‑high pressure water jets, concrete is precisely removed. By adjusting pressure and jet angle, the concrete layer can be stripped while keeping the steel reinforcement intact. Demolition efficiency is more than 20 times that of a conventional jackhammer. It is especially suitable for bridge demolition, tunnel renovation, and nuclear facility decommissioning. This is a cold cutting process – no sparks, no high temperature, no dust – offering unmatched safety in explosive or confined environments.

5. Selection & Usage Guidelines

Selection tips:

• Confirm system maximum dynamic pressure does not exceed 280 MPa.

• DN8 bore is ideal for medium‑to‑high flow water jet jobs, balancing pressure and flow.

• Verify compatibility of all fittings; use original certified couplings.

• Ensure operating temperature is between -10°C and +70°C.

Safety points:

• Inspect outer cover for cuts or wear before each use.

• Do not exceed the rated minimum bend radius during installation.

• Perform periodic hydrostatic testing. Recommended replacement every 2 years or based on service intensity.

• Operators must wear safety glasses and face shields to protect against high‑pressure water jet injuries.

Choosing the 280 MPa ultra‑high pressure hose (DN8, 20 m) means choosing a professional, safe, and efficient solution to conquer extreme applications like ship cleaning and hydraulic demolition. For higher pressure ratings or special lengths, contact the manufacturer for a complete selection.