sive flm of chrome-oxide on the surface to prevent attack and
penetration into the steel substrate below in the form of iron
oxide. A higher grade of stainless steel could have prevented
this corrosion from occurring.
Aulffo Painting of Minotola, N.J., was consulted for its
expertise on tank rehabilitation and to perform the tank re-furbishment. “We constantly strive to provide long-lasting
service and affordability to our customers, and in this unique
situation we had to react quickly with a solution to minimize
Logan Township MUA’s tank downtime,” said Jon Lattin of
Corrosion Technology Systems. MUA arranged for a separate
contractor to weld in new sections of stainless steel in areas
that were compromised. The stainless steel was then abrasive-blasted by Aulffo Painting to achieve a 3-4 mil profle (SSPC- 5
White Metal blast).
The lining material selected to protect the structure was Sauereisen’s SewerGard™ No. 210X, chosen because of its chemical resistance, elongation and abrasion-resistant properties.
Aulffo Painting spray-applied the material in two coats, totaling
60 mils, to withstand the corrosion and abrasion from solids and
debris in the wastewater. The walls were coated 12 inches below the low waterline up to the top of the tank — the area most
susceptible to the corrosive effects of the MIC.
Gary Aulffo, president of Aulffo Painting, stated, “We have
been working with Corrosion Technology Systems and Sauereisen for over 10 years, and over the course of countless projects,
they have proven to provide the highest quality products, complemented by excellent customer service.” Another preventative measure taken by the Logan Township MUA was to replace
the closed hatch tops with open grates to minimize the accumulation of destructive hydrogen sulfde gases in the vapor zone.
Spraying epoxy in February and March in the Northeast
adds additional challenges for applicators such as keeping the
material and substrate at the proper temperatures to insure
ease of application and proper cure. Southern New Jersey’s
late winter temperatures are unpredictable with the average
temperatures in the 30˚F – 45˚F range. Aulffo Painting erected
a small heated storage area in
which to store the materials be-
fore application and also piped
heated air into the headworks
tank during application.
“The entire project
team — CTS, Sauereisen and
Aulffo Painting — were all very
helpful and responsive, result-
ing in a successful project with
no issues,” said Christopher
Whalen, Logan Township MUA
Superintendent. The structure
was inspected by Sauereisen
and MUA six months and 1. 5
years after being returned to service and is exhibiting superior
performance. The coating is 100 percent fully intact with no
indications of areas of concern. It continues to be washable
and serviceable and will be periodically monitored to ensure
“The coating looks to be holding up great. We will continue to check it but, to date, we have no issues,” Whalen
About the Authors: Jon C. Lattin, CSI, CCPR, from Corrosion Technology Systems,
is an independent manufacturer’s representative for Sauereisen. Jon is the current
Vice President of the Construction Specifications Institue (CSI)–Allentown Chapter
and serves on several committees for the Eastern PA Water Pollution Control Operators Association (EPWPCOA).
John E. Davis is a Marketing Specialist with Sauereisen Inc., a global manufacturer
of corrosion-resistant materials. He frequently contributes to professional journals
on the topics of specialty materials and the rehabilitation of wastewater infrastructure. John graduated with a bachelor’s degree in business management and a minor
in marketing from Penn State University with honors.
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Coated stainless steel sidewall after
six months in service (tank cleaned).
View looking down the
tank after six months in
service (tank cleaned).