A pressure cyclone is designed to separate
steam from the pulp in a paper or card
manufacturing plant. The pulp itself coupled
with high temperatures and chemical content
produces a very aggressive corrosive and
abrasive environment.

Two cyclones were delivered to Corroserve’s
workshop in Leeds in need of a programme of
repair and onward protection against abrasion.
Both cyclones were suffering from severe
abrasion damage and both exhibited through
wall defects.

The paper plant operators wanted to protect
against future damage, and the resulting
expensive downtime, and a significant increase
in service lifetime was also required.

Corroserve recommended that after being
abrasive blasted to Sa2½ the internal surface
be repaired and reinforced using wetted out
300gsm glass fibre matting. After initial cure
multiple coats of Plasmet HTE were applied to
both internal and external surfaces to reach a
required DFT of 2000 microns.

Plasmet HTE is a viscous, solvent free, amine
cured epoxy, containing both stainless steel
flakes, glass flakes and silicon carbide. The
specialist coating provides excellent abrasion
(and chemical) resistance.

Plasmet HTE material has been used in
cyclones, chemical process vessels, sugar beet
pulping drums etc. It is also useful for building
up damaged areas of pump impellers and
casings where impact or abrasion, are
prevalent. The coating has good temperature
resistance; Immersed conditions – 275°F. Nonimmersed conditions – 338°F.

Plasmet HTE in conjunction with composite
structural repair techniques will ensure the
cyclones will have an increased service life and
much greater protection against abrasion.