After experiencing severe telluric current activity on
a pipeline, the author researched the subject. The
causes and effects of telluric currents are explained
and precautions for obtaining data on forecast
telluric activity are given.
This article compares three water quality indices for
the evaluation of water to be used in industrial
processes in Iran. They include the Puckorious
Saturation Index, Langelier Saturation Index, and
Ryznar Stability Index. The most applicable index
for use in that country is suggested.
Re-engineering supply chains can reduce costs, cut
delivery times, provide a significant competitive
advantage, and enhance customer relationships.
Supply chain concepts can be applied to the
finishing phase (coating or plating) of production
to further cut costs and delivery times.
This article discusses the challenges involved with
coating contact, or “faying,” surfaces of steel
building components that are bolted together.
The use of certain zinc-rich primers is one successful
solution, provided the primers meet required
parameters for slip coefficient.
The heliport on a very large offshore structure
required complete coating removal and
replacement. The work could not be performed
during daylight hours because of a very busy and
crucial flight schedule, as well as safety concerns for
the workers from paint debris and metal loss. This
article describes the methods and materials used to
perform the work during nighttime hours. The
job was successfully completed in two weeks.
“Stop, Look, and Listen.” These words from railroad crossing signs are good ones to keep in mind when troubleshooting cathodic protection (CP). Some trouble shooting efforts are pretty straightforward, involving depleted anodes, broken wires, burned out rectifier stacks, and the like. But there are occasions when nothing seems to make sense, and then it’s time to “stop, look, and listen” and figure it out. Here are a few experiences from nearly 45 years of CP work.
An excellent coating job can be ruined by
mechanical damage during shipping and
installation of the coated piece. Coating repairs can
be time-consuming, expensive, and may yield an
inferior coating job. This article provides
precautions to be taken to minimize coating
damage subsequent to initial coating.
Molybdenum-bearing stainless steels and nickel
alloys can experience catastrophic oxidation. This
occurs during oxidation of molybdenum-bearing
materials and is caused by the action of
molybdenum trioxide (MoO3) as an oxidation catalyst. This article explains the oxidation
phenomenon and suggests ways to prevent it.
Being a cathodic protection corrosionist is a lot like
being a detective. It is necessary to examine all the
evidence when solving a mystery. Sometimes it is
necessary to establish a stakeout. That’s what was
done to find the source of intermittent shorts in this
incident. Careful use of instrumentation, data
analysis, and observation solved the problem.
This article presents experimental data that show
the solubility of lead in different waters. Specifically
noted is the solubility of lead in condensed, or
“pure,” water. It provides introductory information
to those just entering the field of water corrosion
and contamination as well as basic information
to others not familiar with water corrosion
and contamination.
The author visited Antarctica in January 2006. He
came across several metal artifacts that had been
there since early in the 20th century. Corrosion
is not a serious problem in Antarctica’s
environment, as evidenced by the relatively
good condition of the artifacts.
The purpose of this article is to draw some attention to the importance of surface preparation and coating inspection and perhaps change some attitudes and the all-too-common practice of assigning less than qualified and experienced personnel to inspect surface preparation and coatings.
The “Spoonbridge and Cherry” is an iconic sculpture in Minneapolis, Minnesota. Recently, concern was expressed over the condition of the cherry and its coatings. The cherry was inspected, removed, and recoated. This article describes the rehabilitation process and the materials used.