DCN
International is a Dutch company
with offices throughout Europe
and in Hong Kong.
We have over 40 years experience
in all types of underwater
operations in Europe, Africa,
the Middle East and Far East. We
are specialists in:
All diving operations,
including saturation diving
Hyperbaric operations
Underwater concreting
Underwater excavation
Concrete pumping
Inspection and survey
Soil anchorage
Injection works
DCN complete two major cooling
water intake projects
In the last year, Dutch company
DCN have completed two major
cooling water intake repair and
refurbishment projects. They
have maintained their reputation
for innovation, rapid
mobilisation and completing
works on schedule.
China Light and Power, Black
Point Power Station, Hong Kong
SAR
The task was to clean and repair
four seawater intake culverts
and install new hypochlorite
dosing lines. Each culvert is
about 400 metres long,
constructed from 2.4 metre
square concrete sections. The
culverts were thick with marine
growth and the concrete sections
had shifted, opening up gaps in
the culvert walls. Extended
diving operations were only
possible from the shoreside
ends.
The work had to be completed in
two outages, the first in from
1st November to 31st December
2003, the second from 1st to
31st January 2004.
Cleaning machines and mobile
habitats
DCN’s solution was two custom
built Remotely Operated Cleaning
Machines (ROCMs). Each ROCM
cleans marine growth from the
culvert walls and floor, crushes
it into a slurry and pumps the
slurry back to surface through a
discharge hose.
For the diving work, DCN
supplied two custom built Self
Controlled Habitats (SCHs). Each
SCH is a diving bell on wheels,
allowing the divers to drive
along the culverts carrying out
repairs and installing the new
dosing lines.
