Operators developing offshore oil and gas reserves face the increasing challenge of reducing costs when the developments move into deep and deeper water. 💰🌊 The riser system cost is particularly sensitive to any increase in water depth,; this is true also of the riser installation costs. 💸 The majority of current deepwater riser systems are based on a welded construction. 🏗️ High specification vessels are required to install these welded risers, incurring high day rates and mobilisation costs. 🚢💰 #offshore #engineering #oil&gas
The installation of flexible risers in deepwater is often limited by the collapse resistance of the pipe as it may be installed empty to keep the riser weight within the pipe lay vessel’s tensioning capacity. As the external hydrostatic pressure increases with water depth, the maximum riser diameter is thus limited by the practicality of strengthening the flexible pipe structure to resist the external pressure. #engineering #deepwater #oilrig
Flexible risers and flowlines are normally designed, procured, and installed from a single vendor. There are only a handful of companies worldwide that manufacture flexible pipes for riser systems. #OilandGas #Energy #Engineering
The flexibility of these pipes allows them to be spooled continuously onto a reel for efficient and quick transportation and installation. Installation speeds can average 500 meters per hour. Flexible risers can be installed from a large number of reel lay vessels, however, for larger pipe diameters and deeper water, the number of capable vessels is reduced. Special reels may have to be built in the case of large-diameter flexible risers. #engineering #construction #piping
The installation weather window is mainly determined by the vessel response to environmental loading. In mild environments, riser installation can be conducted almost year round and so installation schedules are generally quite flexible. For harsh environments, suitable weather windows are small and risers are often pre-installed in the summer months. The risers are wet stored, and simply lifted from the seabed and connected to the host vessel when it is brought on station. #offshore #marineengineering #installation
[ Ссылка ]
