Langeled RFO work at Sleipner
As part of the preparations for the supply of gas to the UK from the
Ormen Lange field via the so-called Langeled pipeline various "pigging"
and flooding work had to be done. Here our vessel worked in conjunction
with the DSV Acergy Osprey - a Dive Support vessel I worked on briefly
in the 1990s.
Here the Acergy Osprey is seen working beside the Sleipner platform.
 |
 |
DSV
Acergy Osprey at Sleipner, February 2007
|
DSV
Acergy Osprey at Sleipner, February 2007 |
Concrete mattresses are often used to protect subsea installations,
especially pipelines.
Dawn (03:30!!) over the Acergy Piper, Tyrihans, June 2007
Pipelay
There are various types of pipelay vessel - some operate in "DP" using
thrusters and propellors to keep themselves in position. Others use
anchors - and during such a pipelay there can be an amazing number of
vessels involved. The barge itself, anchor handling vessels, pipe
carriers (to re-supply the barge) and lay support vessels.
Counteracts such as depicted above are used to physically constrain the
position of the pipeline during the lay. They are usually recovered
after use.
Pipelay Initiation
Initiation piles are used to anchor the pipeline when commencing a
pipelay. These piles need to be driven into
the seabed. Below is a picture of a piling hammer being recovered on
completion of such an operation.
