ABRASIVE
BLASTING TECHNIQUE OF SURFACE PREPARATION FOR PAINTING
Abrasive blast cleaning is most
often associated with cleaning painted and unpainted steel. It may also be used
with care to prepare concrete and masonry surfaces and to clean and roughen
existing coatings for painting. Abrasive blasting is an impact cleaning method.
High-velocity abrasive particles driven by air, water, or centrifugal force
impact the surface to remove rust, mill scale, and old paint from the surfaces.
Abrasive cleaning does not remove oil or grease. If the surface to be abrasive
blasted is painted with leaded paint, additional controls must be employed to
minimize hazards to workers and the surrounding environment. The degree of
cleanliness obtained in abrasive blasting depends on the type of abrasive, the
force with which the abrasive particles hits the surface, and the dwell time.
Types
of Abrasive Blasting
a) Air (Conventional)
In conventional abrasive blasting
(Figure 1), dry abrasive is propelled against the surface to be cleaned so that
rust, contaminates, and old paint are removed by the impact of the abrasive
particles. The surface must be cleaned of blasting residue before painting.
This is usually done by blowing clean air across the surfaces. Special care
must be taken to ensure that horizontal or other obstructed areas are
thoroughly cleaned. Uncontrolled abrasive blasting is restricted in most
locations because of environmental regulations. Consult the local industrial
hygiene or environmental office for regulations governing local actions.
Procedures for containment of blasting debris are being used for paint removal
from industrial and other structures. The amount of debris generated can be
reduced by recycling the abrasive. Recycling systems separate the paint waste
from the abrasive.
Schematic Drawing Illustrating
Components of Conventional Abrasive Blasting Equipment
Leopad Group a leading provider of corrosion
protection services ranges from the scope of blasting and painting, insulation,
thermal spray application, passive fire protection, refractory and other
services such as scaffolding, cable tray systems and cathode protection.
We are a
Malaysian company with close to 3000 staff and over 10 offices and fabrication
yards throughout the country. Leopad Group is dedicated to being the market
leader for corrosion protection and provide the highest standards in the
industry with the convenience of providing multi-disciplinary services through
a single point of contact.
For further
enquiries on our services, please contact our Business Development Department
at +603-22600200 , website www.leopad.com or email at hq@leopad.com
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