Current and Wave Measurement
Campaign
TEMA Offshore Mooring Limited
(TOML) imports petroleum products
via a Conventional Buoy Mooring
(CBM) system for the Tema Oil
Refinery , Ghana.
The existing system comprises of an
18” pipeline between the CBM and
Tema Oil Refinery.
The system suffers from low
operability and shows damage to
mooring equipment. TOML
commissioned Project Management
International (PMI) to carry out a
study on the existing system and to
propose measures to improve the
system.
To confirm the environmental data at
the CBM a measurement campaign
to collect current and wave data was
implemented. Metocean Services
International. (MSI) was contracted to
carry out the study.
In March 2007, MSI installed an RD
Instruments 300kHz Acoustic
Doppler Current Profiler (ADCP)
fitted with wave firmware.
The unit has also been fitted with a
double external battery canister to
allow for at least 2 months’ uninterrupted
data collection and all
instruments are moored inside a
gimballed stainless steel bottom
frame (picture right below)
Since April this year 4 service visits
have already been undertaken to
collect data for preliminary design
purposes.
The data collected enables the
engineers to confirm that the wave
direction as derived from the
refraction modelling agrees
reasonably well with the measured
wave direction.
The current measurements showed
that the direction varies more
frequently than expected from
previous available data. The
measured data provided valuable
information for the optimization of the
CBM orientation.
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