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Thousands of hours demanding
North Sea operation – no problem!
Design innovations demand equipment innovations
We produced the first large Rim Driven Thruster in early 2007.
This innovative RDT was developed, engineered and produced by Brunvoll.
It was installed with resilient mounting to supplement the
two existing LowNoise tunnel thrusters.
The combination of resilient mounting and RDT technology
represent the ultimate in noise reduction measures.
Østensjø Rederi AS
• The shipowner is recognized as a leader in the offshore and towage sectors. It
has a reputation for producing innovative ideas that improve safety, capacity
and costs.
• Crew comfort is a high priority for Østensjø Rederi. Both “Edda Fram” and
“Edda Frende” meet DNV’s Comfort class criteria.
• The “Edda Fram” won the Offshore Support Journal award for the
Ship of the Year in 2007.
The 810 kW RDT
was installed in
“Edda Fram” in 2007
On schedule we delivered the RDT1750
to the Platform Supply Vessel “Edda
Fram” owned by Østensjø Rederi As.
This pioneering ship has diesel-electric
propulsion with advanced cycloidal
propellers, reducing fuel consumption
and emissions.
The RDT has been designed for easy
installation, and this was achieved in
only 3 days. The installation has worked
without problems.
Smooth operation
The resiliently mounted RDT and the 2
LowNoise thrusters all
functioned smoothly. The RDT was used
the most! The crew seemed to prefer it.
Noise level measurements are expected
to indicate levels about 20 dB(A) quieter
than for
conventional tunnel thrusters.
“Edda Fram” “Edda Frende”
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