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2006-09-23 News Release
Excellent coatings and coaters partnership To ensure that it does not lose its functionality and quality, a coatings producer stores its product at a cool 20 degrees Celsius on the coaters premises.
The BASF Coatings powder coating is stored at the coater Eupec GmbH’s
premises. Depending on the coating variant, the steel pipes then have
to be heated to 180 - 210 degrees Celsius, after which the corrosion-protection
coating is applied externally and then melts. But it is not just the temperatures
that are correctly matched with each other between BASF Coatings and Eupec
– the excellent partnership is particularly evidenced in the large
degree of commonality: innovative technologies and developments are important
to both; they collaborate on these and also present a joint front to customers
on the global pipeline construction market.
The latest example of this excellent partnership is the construction
of the 130-kilometer-long natural gas pipeline for National Grid Transco
from Milford Haven to Aberdulais in Wales. This illustrates the global
nature of the business: the powder coatings are produced in Verbania,
Italy by BASF Coatings, and they are then applied to the pipes in the
city of Mulheim in Germany’s Ruhr industrial area. Once coated,
the pipes are dispatched to Wales. Such a project calls for the close
cooperation between the customer and supplier to be well organized. “Technicians
and Sales staff from BASF Coatings regularly visit Eupec. We work very
closely together in lab operations and sales. Some aspects of product
development are also carried out jointly,” comments Moller.
Once the right coatings have been supplied and stored, Eupec’s
professional engineering systems guarantee the perfect coating. A monolayer
coating was chosen for the current project in Wales. For each coating
method, the pipes first have to be blasted and then cleaned using deionized
water in a high-pressure washing system. The 18-meter-long pipes are heated
to 210 degrees Celsius by means of an induction coil, and the ends are
then taped because they have to be welded later. Some 80 powder guns now
ensure that the electrostatically charged powder coating is uniformly
distributed on the pipes where it melts. Once the pipes have cooled down
again, the testing stage follows: this involves testing the film thicknesses
and the passive corrosion protection properties of the applied coating.
Long-term properties are continually tested in particular by means of
the hot water immersion test and cathodic disbondment test. This is where
the strengths of an excellent partnership come to the fore. However, pore-free
application of the powder coating is also extremely important. This is
verified in the “holiday test”. “The name could come
from the fact that this is the last stage before coating of the pipes
is complete and the pipes can be transported, after which the work is
over for the staff,” explains Jacobs. In this test the pipes are
passed through a ring of radially mounted copper brushes across which
a voltage of between 3,000 and 25,000 volts is applied, depending on the
film thickness. The steel pipe is grounded which means that a short circuit
occurs and is displayed on the instruments if there is even the smallest
defect in the coating.
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