Page 5 - HolzRMBrochure.indd

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Flue Gas Desulphurization (FGD)
Flue gas desulphurization is one of the most challenging
applications for expansion joints. The nature of the process
is inherently detrimental to most of the common expansion
joint designs primarily due to the “wet” atmosphere found
on the inlet and outlet locations and the possibility of
pressure fluxuations from slightly positive to slightly
negative caused by stack draft during specific weather
conditions.
Typical expansion joint designs create a cavity that often
fills with acidic liquid. This liquid quickly works to
penetrate the edges of the flex element and slowly begins to
degrade the bond between the reinforcement plies and the
elastomer. This process eventually causes the inner ply of
the flex element to bubble and separate from the
reinforcement layer and weakens the tensile strength of
the reinforcement layers. This ultimately leads to the
complete deterioration of the expansion joint even with
the addition of a drain plug for removing the liquid.
Holz has spent many years in the development of a product
suitable for long-term use in this harsh environment. Our
specially designed FGD flex element utilizes a robust FKM
outer flex element resistant to aggressive acids and proven
to provide integrity against pressure shifts up to 5psig along
with a zero porosity PTFE barrier acting as the inner gas seal.
The combination of advanced materials insures long life and
predictable performance.
Contact Holz Engineering
for more details about
specific applications.
SPECIAL APPLICATIONS