Saipem 7000 energy assessment results

The offshore fleet is considered a high priority, not only because of the high consumption of fuel and related expenses, but also for the recent regulatory requirements. The purpose of the assessment was to identify design solutions with a high level of replicability, with the ultimate aim of extending the results obtained to other assets with similar features.

The areas of improvement identified were the following:

  • Installation of heat recovery economisers. The intervention proposed consists of recovering part of the sensible heat contained by exhaust gases, thereby reducing the quantity of fuel needed to power conventional boilers.
  • Installation of Green PC software on computers. Green PC software facilitates a reduction in the energy consumption of idle terminals using various stand-by options and minimising waste.
  • Optimisation of navigation routes. Thanks to real-time satellite measurements, an optimal solution is devised for each voyage which means a saving in navigation time and, consequently, in the amount of fuel used.
  • Installation of electric heaters for engines. Currently, the heating of generator engines is by means of a steam circuit characterised by high levels of heat dispersion. The possibility of replacing this system with a similar one based on the use of electric resistance heaters has been considered. Being installed near the engine, they prevent losses associated with the distribution system.
  • Use of fuel additives. The economic impact generated by the use of fuel is enormous. The possibility of using additives available on the market has been evaluated. These promise to increase the efficiency of fuel use and to reduce the polluting emissions caused by combustion.
  • Replacement of electrical transformers. Some measurements carried out on numerous transformers have highlighted a noteworthy fall-off in performance. Given the high energy flows in play, the possibility of replacing these with better performing components has been analysed.

Integrated with a cost/benefit analysis, the Assessment Report establishes a scale of priorities and actions to be implemented within a reasonable timeframe.

Intervention State of progressTechnical and economic feasibility study
Green PC Applied The advantages that can be obtained
were assessed using on-board
measurements during a preliminary
testing phase, which was followed by
service activation.
Route optimisation Applied The service was activated following an
economic analysis of past savings made
on other Saipem vessels, by applying
route optimisation.
Installation of heat recovery economisers Partially applied Following a study on improved efficiency
deriving from the intervention, it is quite
likely that they will be purchased and
implemented by Saipem over the course
of 2014.
Electric heaters Partially applied Following a study on improved efficiency
deriving from the intervention, the
replacement of components installed
on-board commenced.
Fuel additives  Under study The advantages that can be obtained
were estimated with reference to a sector
study of components similar to those
installed on the Saipem 7000.
Replacement of transformers Under study The saving from the replacement
of several components, whose
performances were obtained from
on-board measurements is currently
being assessed.