Hydro Jetting

Definition - What does Hydro Jetting mean?

Hydro jetting is a widely-used method or process to remove coating materials, accumulated contamination and dirt buildup on surfaces as well as blockages on pipes using high-velocity water pressure through a jet nozzle

A typical hydro jet system consists of the following: pressure pump, the correct nozzle type to deliver the intended water stream to the area to be cleaned, waste handling equipment, work area enclosure and other accessories.

Hydro jetting systems operate at pressures of as low as 4,000 pounds per square inch (psi) to as high as 60,000 psi (414 MPa), depending on the work to be done.

Corrosionpedia explains Hydro Jetting

Hydro jetting is basically power-washing with water, set at parameters appropriate for the intended use. The water stream’s flow rate, speed, shape, direction, mass and/or the pressure are mainly determined by the type of jet nozzles and the operating pressure.

Different types of nozzles, in terms of design and material used, are available for various applications. Among the commonly used nozzle designs are the following:

  • Flat jet nozzles have a wide, slot-shaped hole that creates a water jet in a triangular, fan-shaped spray pattern.
  • Point jet nozzles have a round hole that releases a precise, focused water jet. It is a penetrating nozzle that has a much higher impact than flat jet nozzles, and is often used in cleaning pipes, tanks, filters and component parts, and removing concrete or rust.
  • Rotating nozzles have a rotating portion that sprays to the sides as well as straight ahead; this is the best nozzle for cleaning pipe walls after dislodging blockages.

Each of the above types of nozzles has several variations to best fit specific requirements.

In terms of materials used, the three most common jet nozzles are carbide, steel and sapphire nozzles. According to industry experts, the useful life of a jet nozzle is greatly affected by the quality of the water to be used and the operating pressure.

  • Carbide nozzles – The most durable material for dirty, unfiltered water and operating pressures below 140 MPa (20,000 psi).
  • Steel nozzles – Recommended if water passes through 25 microns or finer filters, and operates below 140 MPa.
  • Sapphire nozzles – Sapphire is brittle; requires clean water filtered through 10 microns or better and operating pressures above 140 MPa (20,000 psi) to have the least wear-out.

A nozzle's wearing out also results in the deterioration of jet quality and effectiveness.

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