TPi July 2016

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38 Tube Products International July 2016
products & developments
Flush system to provide increased
through-bore
The Duoline® Flush System is an
extension and natural progression of
the Duoline DL System, which has been
utilised in onshore and offshore wells
worldwide over the last ten years. Using
the same component material with an
enhanced internal geometry, Duoline is
now able to offer an increased through
bore while still maintaining the benefits
of the original Duoline DL Ring system.
Duoline is a GRE lining system that,
when installed into carbon steel casing
and tubing, protects the base material
from corrosion from CO2, H 2S, O2,
chlorides and water, all or some of
which may be present in the well fluid/
gas. Reservoir clean-up using HCL acid
up to concentration of 28 per cent
can be accommodated to ensure good
flowrates.
Duoline may be installed into threaded
oil country tubular goods (OCTG), either
new or used, within most connection
options. The Duoline Flush System
employs the patented FL-RingTM system,
which permits lining of shoulder-to-
shoulder premium connections without
affecting the connections’ geometry
and performance.
The company can install the system
into a wide range of diameters and
weight bores, and can accommodate
interventions with both coil tubing
and wireline; procedures are already
available for this operation.
Duoline Technologies – USA
Easy cleaning of tubes
and hoses
Stauff Clean offers a simple option
for removing unwanted contamination
in tubes and hoses for maintenance
purposes. In addition, the system can
be an alternative to time-consuming
flushing processes during the production
and processing of tubes and hoses.
Stauff states that its system offers
time and cost benefits compared
to traditional cleaning methods.
Stauff Clean essentially consists of a
lightweight, ergonomically shaped
compressed air gun, supplied with
sufficient compressed air via a quick
release coupling, and a range of
specially shaped plastic nozzles that
are connected to the handheld tool with
retaining rings. The system requires
compressed air at approximately 6 to
8 bar.
The compressed air gun is used to
accelerate foam projectiles into the tube
or hose to be cleaned. The plastic
nozzles compress the inserted projectile,
and also ensure that the connection is
as airtight as possible, while creating a
smooth transition into the tube or hose.
This method is safe and environmentally
friendly, and the operation is intuitive
and quickly learned.
The foam projectiles that carry out the
cleaning are 15 per cent larger than the
inner diameter of the tube or hose to
be cleaned. This creates friction that
effectively releases contaminations.
In addition to a universal version that
covers inner diameters between 6
and 60mm, numerous other projectile
versions with different textures
and grain sizes are available, eg for
removing traces of rust and other
coarse contaminations. The system can
be used up to a tube/hose length of
100m, and regardless of any installed
couplings, fittings and valves.
For more than 50 years, the Stauff
Group has developed, manufactured
and distributed pipework equipment and
hydraulic components for mechanical
and plant engineering, as well as for
service and industrial maintenance.
Walter Stauffenberg GmbH & Co KG
– Germany
Stauff Clean is supplied as a complete set in
a convenient case, on request
Equipping the compressed
air gun with a foam
projectile
Photo credit: Walter Stauffenberg
GmbH & Co KG