Sheth group of Industries is a leading surface
solution company providing surface preparation services like media blasting,
abrasive blasting, sand blasting, shot blasting, grit blasting, glass blasting etc.
SGI has achieved highest proficiency level in thermal coatings. Industrial paint coatings and linings and Inspection services are also key services of our
portfolio. I would like to point out our recommended practice for coating
precautions.
Proper
Storage
Coating materials must be stored under
conditions that ensure they remain clean and dry. Foreign matter and dirt or
moisture will reduce the coating’s effectiveness.
Quality
Control
Ensure coating materials have not
exceeded the expiration date printed on the container. Liquid coating compounds
are susceptible to degradation due to age, temperature, and transportation.Only
in-date compounds should be used and use caution in selecting storage
environments for coating components. Materials in previously opened containers
that did not seal properly may not be usable.
Component
Mixing
Hand mixing of multi-component coating
should be discouraged. Powered mixers are preferred. Applicators must ensure
that equipment is properly cleaned between mixing operations. Dried coating on
a mixer may become partially dissolved by the liquid component(s) being mixed. Some
multi-component coatings may require a certain amount of ‘activation time’
after mixing to allow proper chemical reactions between components to reach
adequate completion before application. Manufacturer-supplied instructions
should be followed closely to prevent any potential problems.
Handling
No matter how tough a coating may be,
rough or careless handling can damage the coating. This may lead to weakened or
dis-bonded areas which may later develop into coating faults. Mechanical damage
should be limited as much as possible. Nylon slings, end hooks, padded caliper
clamps, or other methods that minimize damage to coating will be used to handle
the coated structure. The pipeline ditch must be clear of rock and other
foreign matter. It may be necessary to pad the ditch with rock-free dirt, sand,
and bags or ditch pads.
Field
Conditions
Any repair made under field conditions
where application conditions are not controlled is less likely to have the same
long-term protective capabilities as the original coating.
Rock
Shield Considerations
Select backfill, sand padding, rock
shield or alternative coating should be used any time the backfill or trench
has rock or extreme soil conditions requiring additional protection. If pipe is
to be laid in ditch with a rocky bottom ditch should be over excavated and sand
bags should be laid every 20 feet across bottom of ditch to keep pipe coating
off the rocks. Under certain conditions, Powercrete or multi-layer coatings can
be used in lieu of rock shield for new or replacement areas. Coating should be
need-specific for the soil conditions, climate, and operating parameters.
