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Hydro Jetting Or Jet Cleaning Of Subsea Structures

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High Pressure Hydrojetting Solutions
Subsea Engineering And Services

High Pressure Hydrojetting Solutions

Hydrojetting is a high pressure water cleaning method that removes dirt, rust, marine growth, scale and blockages from critical marine and offshore infrastructure. Unlike abrasive blasting or chemical cleaning, it relies solely on water making it eco friendly, safe and highly efficient.

Applications In The Marine And Offshore Industry

Hydrojetting is used extensively across marine assets:

  • Cleaning ship hulls and propellers to reduce drag and fuel consumption
  • Removing scale from subsea pipelines and risers
  • Maintaining offshore oil and gas platforms to ensure structural integrity
  • Descaling storage tanks and ballast tanks in confined spaces
  • Cleaning piers, jetties and underwater structures for long term durability
Advantages Of Hydrojetting

Advantages Of Hydrojetting

  • Eliminates harmful chemicals, reducing environmental impact
  • Extends service life of vessels and structures
  • Reaches hard to access areas with uniform cleaning
  • Prevents corrosion related failures, enhancing safety
  • Improves performance and operational efficiency

Hydrojetting Techniques

Different pressure levels and nozzles are used depending on the job:

  • Low Pressure Jetting (up to 10,000 psi): Ideal for general cleaning and light marine growth removal.
  • High Pressure Jetting (10,000 to 25,000 psi): Used for heavy rust, scale and coating removal on ship hulls and tanks.
  • Ultra High Pressure Jetting (above 25,000 psi): Suitable for industrial scale descaling, paint removal and surface preparation before recoating.

Jet Cleaning

1. What Is Underwater Jet Cleaning?

Underwater jet cleaning uses high pressure water jets to clean submerged surfaces such as ship hulls, propellers and offshore structures. This environmentally friendly method removes biofouling, marine growth and other deposits without using harsh chemicals. Water jet stripping also called water blast cleaning is widely used to remove coatings, debris and contamination from metal or composite surfaces. Ultra high pressure water jetting (30,000 to 60,000 psi / 207 to 414 MPa) ensures effective removal of coatings while preserving the substrate.

2. How Water Jet Cleaning Removes Coatings

Water jet cleaning works through two primary mechanisms:

  • Erosion: For hard coatings (e.g., metal or carbide thermal spray), a special nozzle breaks the water stream into fine droplets. These impact the coating, eroding it gradually without damaging the base material.
  • Delamination: For softer coatings (e.g., paint, adhesives, ceramic), the water stream remains intact to penetrate the coating and separate it at the bond interface. This method is faster than erosion and ideal for large areas. Selecting the correct nozzle and pressure parameters is critical to ensure maximum efficiency and substrate protection.

3. Water Jet Stripping Subsystems

A complete water jet cleaning system typically includes:

  • Pump to pressurize the water
  • Nozzle for precise delivery of the water stream
  • Enclosure to contain the cleaning process
  • Nozzle and part manipulators for accuracy
  • Waste handling equipment for debris removal
  • Process control devices to maintain consistency

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