Understanding Corrosion in Water Pipelines: A Guide for Pipeline Designers


Surface Preparation Water

Last updated: May 15, 2020

What Does Surface Preparation Water Mean?

Surface preparation water is the water used during hydroblasting or water jet cleaning. This liquid usually is highly pressurized so that it impacts the target surface at a high velocity. Surface preparation water is typically used to remove coatings, hazardous materials and contaminants from a substrate to achieve a desired degree of surface cleanliness prior to applying coatings intended to prevent corrosion.


Corrosionpedia Explains Surface Preparation Water

Surface preparation involves treating the surface of a material to increase its adhesion to coatings. When water is used for this purpose, it is known as surface preparation water. The National Association of Corrosion Engineers (NACE) describes four degrees of cleanliness that can be achieved by water jet cleaning:

  • Light Cleaning (NACE WJ-4/SSPC-SP WJ-4 [WJ-4])
  • Thorough Cleaning (NACE WJ-3/SSPC-SP WJ-3 [WJ-3])
  • Very Thorough Cleaning (NACE WJ-2/SSPC-SP WJ-2 [WJ-2])
  • Clean to Bare Substrate (NACE WJ-1/SSPC-SP WJ-1[WJ-1])

Regardless of the desired cleaning level, the water used during jetting or hydroblasting is required to free of sediments and other impurities so as adequately clean the surface.


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