Installation
Offshore installation is a part of the full scope EPCI (Engineering, Procurement, Construction, Installation) services that BOS Shelf, together with partners, provides to the customers. All our partners are committed to their obligations at the highest level of professionalism, according to the internationally recognized standards.Our Installation Services Include:
Jackets Installation
The process starts with loading and transportation of all jackets on board of “Gurban Abasov” crane ship to the installation location.We define target installation locations by utilizing surface positioning system. For the purposes of the setting up rigging connection/removal, we provide sea access ladders and temporary walkways.
Having the light jacket on the seabed and no other means of temporary securing the jacket, we perform pile installation immediately, considering pile batch stabbing. Pile driving sequence starts from the highest jacket leg, progressively to the lowest one. We also perform levelling of jacket, if required, with adequate levelling tool.
Foundation Piles Installation
Transportation of jacket’s foundation piles is being implemented on board of “Gurban Abasov” crane ship, together with jackets. Different pile diameter and wall thickness govern a size of ILT used for pile upending, as well as, hammers/sleeves set up between different pile installations.Pile upending is being conducted either via an upending clamp or a sliding mat (dependable on size) after a structural check.
Decks/Bridges Installation
All the decks/bridges are also transported and installed from the “Gurban Abasov” crane ship. We use bumpers and guides during installation if necessary, performing survey checks prior to installation of decks/bridges. Interface welds process follows the structure installation, applying approved welding procedure.Topsides Modules Installation
Module transportation barge satisfies all the criteria for necessary transportation.Also, a dedicated Transportation analysis is implemented for the following:
- Intact and damage stability of the barge
- Longitudinal strength of the barge with the given loading condition
- Bollard pull requirement for towing between fabrication yard and offshore site
- Motion response for given environment
DBA’s anchor patterns require fixed mooring points in the shallow water. Fixed mooring points are established based on mooring analysis and soil characteristics. Suitable vessel or spud barge is mobilized for the piles installation, capable of working in the shallow water at location.
All of the mentioned structures are installed in line with installation tolerances stated in “GS EP STR 401 – Load out, seafastening, transportation and installation of offshore structures” document.
The required pre-installation seabed survey operation is performed in advance of the installation campaign as per requirements to confirm design seabed condition and possible debris and obstruction.
Offshore Logistics
All the work related to logistics is performed locally under the control of the BOS Shelf Marine Base Management, namely:- Receiving and unloading CPI/Project materials through various transport modes (land, rail, sea) that all extend into the base
- Storing and protecting CPI/project materials in accordance with Project requirements
- Preservation and maintenance of materials and equipment
- Loading out and seafastening materials and equipment to the final point of use by directly loading vessels docked at the quayside
- Vessel mobilization/demobilization
- Vessel fuelling and operational support (storage area for equipment, equipment and personnel transfer from the vessels to quayside, waste handling services, etc.
Vessels
GURBAN ABASOV - Main characteristics
- Ship name - «Gurban Abasov»
- Length overall - 141,40 m
- Length between perpendiculars - 121,75 m
- Breadth - 54 m
- Depth to main deck - 9 m
- Depth to work deck - 13,00 m
- Draft, summer - 7,99 m
- Max. passengers - 217
- Lightship Weight – 12 132 t
- Max Crane Capacity – Main hooks – 600 t (2 x 300 t)
- Max Crane Capacity – Auxiliary hook - 150 t
The thruster system of the vessel is currently composed of only two steerable thrusters and two bow tunnels. The upgrade to operate in DP-3 includes adding further four Thrustmaster OD1500N modular Hydraulic Outboard Propulsion Units with 90° tilt. These thrusters are equipped with independent modular containerized diesel hydraulic power units (with local control panels), remote control panels and DP interface panels.
DBA
- Ship name - «Azerbaijan»
- Ship type - Crane ship
- Built – Blohm + Voss Hamburg
- Year - 1978
- Ship’s owner - Special Sea Oil Fleet Office
- Port of registry - Baku
- Length overall - 121,00 m
- Length between perpendiculars - 120,00 m
- Breadth - 34,50 m
- Depth to main deck - 7,50 m
- Depth to work deck - 11,00 m
- Draft, summer freeboard - 5,56 m
- Aft perpendicular - 0 frame
- Forward perpendicular - 41 frame
- Midship - 1,0 m aft of 21 frame
