An offshore vessel is one that serves a special purpose for example taking up construction work or providing support in oil exploration. Although the term offshore vessels collectedly refer to, the category of ships that are used for operating on the high seas, they have evolved and their operations have expanded noticeably.
Nowadays, there are several types of offshore vessels that do much more than just drilling and exploration. You can use them in sending high-priority supplies to construction units and excavation sites, on the high seas. Another offshore project they are engaged in is allowing crew personnel from offshore operational areas to be transitioned and relieved as and when required.
Platform Supply Vessel
Platform Supply Vessel (PSV) is a variant of offshore vessel that is used in offshore drilling as, they get deployed for hauling a variety of items such as food, stores, spare parts, and equipment, among others that an offshore rig may require for routine operations.
A PSV begins its journey by loading up at shore. Liquid cargo gets stored in double-bottom tanks, even as dry cargo is held in special pneumatic pressure tanks. Large items for instance drill pipes and various drilling equipment are laid down on the deck. A rig crane is deployed for moving deck cargo; even as liquid and powder cargo is loaded onto the rigs by using pumps.
In a regular voyage, half the time goes into loading and unloading. Working onboard a PSV is not just challenging but also risky since it involves the use of heavy machinery in harsh sea conditions.
Anchor Handling Tug Supply Vessels
Also called, AHTS, these vessels carry out multiple functions and can be used to aid drilling rigs handle supply platforms, towing rigs, anchors, and mooring chains. High bollard pull is a key feature for accomplishing this kind of work, and this is reflected in the vessel’s hull shape, power exigencies, and size of the propeller.
It is vitally important for this offshore support vessel variant to keep stable. They, furthermore have to have enough space for storing equipment and chains. Anchors and wires are passed over the stern employing a stern roller to simplify the operations.
Construction Support Vessels
Offshore Construction Vessels basically feature wide, open areas on the deck and spacious habitation. They are designed for working on a large offshore project and are equipped for staying at the site for lengthy periods. The vessels are equipped with heavy lift cranes, and they support both underwater and surface installations.
Also referred to as Construction Support Vessels (CSV), these are more or less, used for IRM – inspection, repair, and maintenance projects too. Well-stimulation and maintenance are the main tasks of an IRM with, these offshore support vessels typically being remotely operated for supply operations.
The Final Words
Last but not least is Seismic Survey Vessels which are specially designed for conducting seismic surveys out in the ocean. These one-of-a-kind carriers aid in identifying the best areas where oil can be drilled, without causing any disturbance to marine life. They decide the fitness of an area for drilling, by shooting seismic waves and measuring the time frame of their return.