Surface Preparation of Ships Pipelines made Easy for Painting

by OldSailor on March 26, 2008

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Pipelines are the lifeline of ships. As most of the pipelines are made of ferrous material, pipe surfaces are required to be protected against corrosion. Painting of the pipelines is necessary to protect the pipelines. Merely painting the pipe surface without surface preparation is of no use.

Surface preparation standards are laid down by institutions like Steel Structures Painting Council (SSPC), National Association of Corrosion Engineers (NACE), Swedish Standards Institution (SA), International Organization for Standardization (ISO).

Pipe surface preparation

Surface preparation can be done in different ways depending on the requirement. The methods are briefly given below and these methods are not limited to pipe surfaces alone and is applicable to all ferrous structures.

  1. Solvent cleaning (SSPC-SP 1): this involves removal of oil,grease,dirt and salts from the surface by using solvents,emulsions,cleaning compounds,steam.
  2. Hand tool cleaning (SSPC-SP 2): this involves removal of rust scale, loose rust, loose paint by hand wire brushing,sanding,scraping,chipping in addition to removal of oil,grease,dirt,salts
  3. Power tool cleaning (SSPC-SP 3): this involves removal of rust scale, loose rust, loose paint by using power wire brush, power impact tools, power sanders, power griders in addition to removal of oil,grease,dirt,salts. In this method buffing and polishing to smooth finish must be avoided as paint will not stick while painting after cleaning.
  4. White metal blast cleaning (SSPC-SP 5/NACE No.1/SA 3): this involves removal of rust scale, rust, paint and other foreign particles by using abrasives propelled through nozzles or centrifugal wheels. The cleaned surface will be grey white uniform metallic color. The cleaned surface when viewed without magnification would be free from rust scale, rust, paint and other foreign particles
  5. Commercial blast cleaning (SSPC-SP 6/NACE No.3/SA 2.0): this involves removal of rust scale, rust, paint and other foreign particles by using abrasives propelled through nozzles or centrifugal wheels. The cleaned surface would be completely free from rust scale, rust, paint and other foreign particles. At least 67% of each square inch of the cleaned surface would be free from all visible residues.
  6. Brush off blast cleaning (SSPC-SP 7/NACE No.4/SA 1): this involves removal of rust scale, loose rust, loose paint and other foreign particles by the impact of abrasives propelled through nozzles or centrifugal wheels. The cleaned surface would be free from loose rust, loose paint but tightly adhered rust, paint, coatings are permitted subject to adhesion and bonding of paint to be applied.
  7. Pickling (SSPC-SP 8): this involves removal of rust scale, rust by chemical reaction or by electrolysis or by both methods. The cleaned surface would be free from all scale, rust, foreign particles including soot, unreacted or harmful acid or alkali
  8. Near white blast cleaning (SSPC-SP 10/NACE No.2/SA 2.5): this involves removal of rust scale, rust, paint and other foreign particles by using abrasives propelled through nozzles or centrifugal wheels. The cleaned surface would be completely free from rust scale, rust, paint and other foreign particles. At least 95% of each square inch of the cleaned surface would be free from all visible residues.
  9. SSPC-SP 11: This meets the requirement of power tool cleaning to achieve a bare metal surface and to retain or produce a surface profile.

In the above methods of surface preparation, #3 method power tool cleaning can be easily done in the ships by Rustibus pipe series.

Rustibus pipe series

  • are made of stainless steel and aluminium to meet perfect design and quality
  • uses centrifugal force to clean the surface, by means of rotating hammers with Cemented Carbide units
  • removes paint and corrosion in one 360 degree operation and covers a length of 75ft/23 m per hour
  • can meet surface preparation standards of SSPC–SP11
  • are cost effective and environmental friendly

Here are some photographs of Rustibus pipe series.

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Click here or below to view a video clip of Rustibus pipe series in action.

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{ 1 comment… read it below or add one }

Waterjet Industry November 23, 2011 at 4:14 PM

Hi,

Good article and especially liked the video, looks like a fantastic product.

Just for future refrence, does the Rustibus pipe series generate heat?

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