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Improving offshore efficiency

Improving offshore efficiency

NPCC Engineering has successfully created a well head platform at WO-16 and SB-14 cluster field located at South East of SH process complex of Mumbai High Field in water depth of 75 to 80 m, with the help of Tekla’s 3D BIM-based software.

NPCC Engineering (NEL) a joint venture of NPCC, Abu Dhabi and Arcadia Shipping, Mumbai, had a task to create well head platforms at WO-16 and SB-14 cluster field located at South East of SH process complex of Mumbai High Field in water depth of 75 to 80 m. The project scope consists of five new well head platforms and two major deck extension on process complexes. NEL was already equipped with high end software needed for oil and gas upstream projects such as PDS, PDMS, STAAD, Sacs and Caesar.

There was need to have 3D software to handle their all structural needs start from concepts to engineering, detailing, fabrication to erection. After extensive evaluation and anticipating upcoming challenges NEL decided to switch from traditional 2D-based platform to 3D BIM-based process and technology. Their choice was Tekla and they decided to implement the software in this fast track green field well head platform project.

WO-16 Cluster & SB-14 Wellhead Platforms Project

This project is a new well head platform which is supported on four-legged fixed jacket structure with two legs having single batter and other two legs have double batter. Jacket is made of tubular sections, welded together, and it is anchored in seabed with main/skirt piles. Jackets have spider deck at top level and have diagonal bracing in all faces connecting horizontal framing levels.

It also includes boat landing, buoyancy tank, anodes, riser, skirt pile guide and lifting /upending, trunnion, etc. Maximum jacket weight is 2,100 MT. The platform top side consists of sub-cellar deck, cellar deck, main deck and aluminium helideck. Top side also includes building module, vent boom, crane pedestal, solar panel supporting platform, well head access platform, walkways, stairways, ladders and railings. Maximum topside weight is 1,900 MT.

Interoperability contributed towards success

The design and modelling of the structure was done with the Tekla Software right from the early stage. Modelling began with the main steel and secondary steel structure as soon as the calculations were completed with SACS.

The model is completed later with all the tertiary elements such as the connecting plates, equipment supports, access platforms, padeyes, stiffeners, node plates, cut outs and penetrations as the vendor information was made available. The robustness of the software in dealing with the changes was beneficial in the overall smooth execution of the project.

Complexity handled with ease

NEL structural design team worked based on the requirements of client and came up with relevant technical and design issues to be developed and incorporated in the Tekla model. In the process of project execution, Tekla local support team got valuable feedback on a few small requirements of offshore industry incorporation. This can further fine tune Tekla offerings to all offshore players.

Other salient features of Tekla that can help on a fast-track project are:

• Easy to learn and implement.
• Tekla Structures allows simultaneous access by multiple users to the same model.
• Web-link facility allows engineers to review the model simultaneously as it is getting developed.
• Tekla Structures users can streamline the design and fabrication processes, ultimately ensuring the highest level of quality in project deliverable.
• Free tools Tekla BIMsight for every NEL team member involved in projects to communicate collaborate with others.

NEL received the following benefits:

• Generating detailed structural material take off list very quickly and accurately during design phase of job.
• Monitoring weight of the structure and the position of the deck structures centre of gravity during the design phase.
• Direct output of 2D drawings to present to the end-user or client and the relevant authorities for approval or certification purposes thus reducing human errors and checking time drastically.
• The software allows user-friendly interface with piping or E&I models in PDS for reviews and complete clash-free structural model.
• Import of main steel frame directly from analysis software SACS.
• Using Tekla 3D structural model for regular design review kept it fully coordinated from any conflicts with the equipment, piping, cable trays and access routes.

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