July 2011 Tube ProducTs InTernaTIonal
55
Corrosion resistant
tube and pipe
Liner technology offers alternative
for deep-sea pipelines
The joint development of a lining solution
by Evonik Industries and Swagelining
Limited is still in its infancy, but it has
great potential. Instead of the corrosion
resistant alloy pipes currently used for
many offshore oil production flowlines,
the two companies are now developing
a completely different concept: a
combination of established liner
technology from Swagelining and the
custom-tailored Vestamid
®
polyamide 12
from Evonik.
This technology, based on the concept
of PE lining, which has been used
successfully for many years to protect
water-injection lines worldwide, is
now being developed for hydrocarbon
service to 100°C.
Compared to corrosion resistant alloy
pipes currently used for hydrocarbon
transportation, carbon steel pipes offer
cost benefits and are more readily
available, but are also more susceptible
to corrosion from aggressive products.
Carbon steel pipes with liners
constructed of Vestamid, however, are
protected against internal corrosion
and also offer a weight and price
advantage. In the current project phase
of development, Vestamid is being
integrated with Swagelining’s liner
installation technology to provide a close
fitting, fully protected pipeline system.
evonik degussa GmbH
– Germany
swagelining limited
– UK
Corrosion protection for tubes
Benteler, Germany, is a manufacturer of
high-quality steel tubes, and produces
chromium-VI-free galvanised precision
steel tubes under the name Zista-CRF
®
.
These tubes are used in applications
such as vehicle tubing and for machine
and plant construction. However, the
coating must meet higher requirements
in numerous applications.
The combination of surface
damage through transportation,
handling and further processing,
as well as the absence of the
self-repairing effect of the
chromium-VI-free coating, lead
to a limitation of corrosion
protection
characteristics.
Benteler offers welded and
seamless Zistaplex
®
tubes in
the chromium-VI-free product
range as a solution to this
problem.
Benteler Zistaplex improves the
corrosion resistance of galvanised tubes
through an additional organic coating.
In addition to providing corrosion
protection, Zistaplex is distinguished
by excellent formability that meets
most requirements, even after complete
machining of the tubes. This eliminates
the complex and costly galvanising and
painting process on the customer side.
The special production process enables
the flexible use of different organic
coating types.
In addition to free colour selection,
special requirements such as
temperature and chemical resistance
can be met. A solvent-free process
is employed for environmental and
personnel safety reasons, which fulfils
requirements of the EU Solvents
Directive.
The process also ensures a uniform
coating and uniform corrosion protection
over the entire tube, which enables use
of the most common DIN and SAE tube
screw fittings without prior removal of
the coating.
benteler Tube Management GmbH
–
Germany
Installation of a
polymer liner by
the Swagelining
technology
Galvanised
precision
steel tubes
