COFLEXIP & Services Inc.
In the case of replacing a
damaged riser with a Coflexip
riser, a new flange, if not already
existing. is installed on the
pipeline to terminate it. The flange
can be installed on-bottom, if
there's no need to raise the
pipeline. Any type of approved
underwater welding can be used to
install the flange.
The topside end of the flexible
workboat to the platform using the
platform crane or an air tugger.
Subsequently, the flexible riser is
paid off the back of the boat into
On the seabed, the flanged
end of the Coflexip riser is mated
to the pipeline. The connection is
easy because the riser is flexible.
In addition, maneuvering the riser
into the clamps is simplified by the
Coflexip advantages decrease the
potential diver time, thus expense.
J-tube risers, flexible versus rigid
Replacing a J-tube riser with a new
one of rigid pipe presents a costly
and large-scale operation because
A Coflexip riser can be pulled
through a J-rube or 1-tube with
only the platform crane or an air
tugger. It is nor necessary to
mobilize an expensive barge.
normal need for a barge. With
Coflexip you can avoid both the
water-depth difficulties and the
If the jacket has an available i-
tube, the new Coflexip riser can be
pulled through it using a workboat
and a platform-mounted crane or
If there is no available J-tube,
you can install a clamp-on riser
even in depths where J-tube risers
are usually required. It's easy to
install a Coflexip clamp-on riser in
great water depths because there's
no need for the precise alignments
that have to be made with rigid
The Coflexip clamp-on riser
retains another advantage of the
original J-tube riser. It can be
clamped to the inside of the jacket
where the jacket protects it, and
there's no need for a riser guard.
A reliable riser for less
advantages of using Coflexip for
no need for a large support
no need for heavy underwater
measurements or alignments to
no clamping problems
no need for a long weather
contraction, other than some
slack at either end.
Major oil companies are now using
Coflexip flexible risers all over the
world in working pressures up to
For protecting a pipeline from
Coflexip offers a much greater
degree of safety than rigid pipe
Sediment creep and mudslides are
flowlines at the mouths of rivers,
In a mudslide, the built in flexibility
and the slack of the Coflexip
preventer riser damage due to the
relative pipeline movement.
bottom currents, earth tremors, or
bottom faults. The Mississippi
Delta and Southern California are
Rigid pipe, even with ball
cannot long withstand severe soil
movements. Coflexip can.
In areas of unstable soil, you
incorporating into a pipeline a
section of Coflexip laid out in an
"S" or "U" configuration. The
Coflexip can be bent to a very
small radius of curvature; a 10-
inch I.D. line will bend to an eight-
"Slack" in this section allows the
soil movement to displace the
pipeline instead of damaging it.
When the slack is taken up by
a movement of the soil, a new "S"
or "U " section can be inserted. Of
course a Coflexip riser or flowline
can be laid out with enough slack