Download - Mammoet BV

Skidding 5% Downhill
A Chinese yard had to move a
Floating Production Storage and
Offloading module (FPSO) across
its slipway and appointed Mammoet
Singapore as the skidding contractor.
What was special about this project
was that the slipway had a downwards
slope of 5%. Hence it was a
real challenge to control the movement
of the 5,200 ton module.
Basically, we had to make sure that
the module did not slide down the
incline uncontrollably. After some
careful experiments and adjustments
to the push-pull units
the multinational Mammoet crew
developed an effective procedure.
Even so, they could only move the
module at half the normal speed.
Return to Caspian Sea
“ It was a real
challenge to
control the
movement of the
5,200 ton module”
After the cold winter, Mammoet returned to the Caspian Sea. As the equipment
Mammoet had left on site had been specially treated for winter storage, Mammoet first
had to prepare it for use.
The first lift was of a module with a weight of 3,480 tons. Moving the module between
the piles (which we had installed before winter), connecting it to the strand jacks and
raising it up took thirteen hours. This was the fifth of a series of fourteen modules which
Mammoet will be installing.
Mammoet used their special containerized strand jacks for this project. Each unit
consists of two containers, one with two strand jacks and the power pack, and one
with drums for the wire rope. These containers are placed on the piles and then pull the
modules up and hold them in position while they are welded to the piles.
Offshore
LOCATION: NANTONG, JIANGSU, CHINA
JOB: SKIDDING A FPSO
CHALLENGE: GOING DOWN AN INCLINE
“ Special
containerized
strand jacks for
this project”
LOCATION: CASPIAN SEA,
KAZAKHSTAN
JOB: INSTALLING OFFSHORE MODULES
CHALLENGE: DIFFICULT ENVIRONMENT