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Tag Archives: jetty

MAKING CERTAIN OF THE BEST SOLUTION THROUGH COLLABORATION

We recently worked with ABG Shipyard Ltd in Gujarat, India, to develop a bespoke fendering solution which needed to overcome the high tidal variation, underwater current and high wind velocity that they face at their shipyard.

The work we did with ABG Shipyard is a great example of how much added value a bespoke solution, considered on the merits of the specific development, can bring to a project.  When we talk about the benefits of bespoke solutions, it’s often in terms of safety and reducing maintenance – and therefore enabling whole life cost savings. In this case, overcoming the various hurdles brought about in the project, and sticking to a tight timeframe saved ABG Shipyard about €2 million of cost for their project.

The solution required for ABG Shipyard meant that a lot of operational hurdles needed to be overcome, in addition to the demanding environmental considerations, the system was required to meet the conflicting demands of an economical jetty design, whilst being able to accommodate high impact loads.

The solution we came to ultimately used two piles connected with a fabricated frame to improve the load carrying capacity of the jetty. Parallel motion fenders were then installed on the centre of these beams to further reduce impact on the structure, eliminating conventional fenders but providing the most cost effective and easily installed solution, with a quick turnaround time.

The beam structure was designed at our Design Centre of Excellence in India, which also carried out stress analysis of the proposed system.  The complete proposal, including stress analysis, was reviewed and approved by ABG Shipyard and their structural consultant, engineers, as well as being validated by British Maritime (BMT), who acted as independent third party design review.

We worked closely with ABG’s civil consultant and technical team and combined our design and manufacturing capabilities with their knowledge of the specific environmental conditions they work with every day.  Thanks to this sharing of expertise, we were able to develop an effective solution that perfectly met the needs of the project.

I’ll leave you with a few words from D.N. Mathur, Senior Vice President of Projects at ABG Shipyard Ltd. I think Mr Mathur’s words summarise how much value a tailor made solution can add, and the need for suppliers to be involved at the design stage, to maximise operational efficiencies, and reduce costs.

“Trelleborg worked with our civil consultant and technical team to develop a custom-built solution, without overrunning on tight project timelines. Overcoming the operational hurdles posed by the rough environmental conditions at the jetty within this timeframe meant a saving of approximately €2 million to ABG.”

SHIP TO SHIP FOR FLNG – CONSIDER THE BIGGER PICTURE

Tom Toth, Technical Manager for Offshore Integrated Mooring, Trelleborg Marine Systems

With the Petrobas’ jetty in Bahia, Brazil currently under construction and  the conversion  of LNGC Golar Winter to a Floating Storage and Regasification Unit (FSRU), which will be moored alongside: how important is it to have an one party with oversight of the design requirements of the FSRU, jetty and Liquefied Natural Gas Carrier (LNGC)?

FSRUs provide an economical alternative to land based fixed LNG import terminals, offering  relatively short lead time to start up, significantly lower capital cost to construct and the ability to cater to difficult to access or isolated locations. They can also provide effective interim solutions before a major onshore terminal is built.

Essentially, the FSRU (a ship like facility) can take the place of an onshore LNG import terminal with a regasification plant, thereby acting as a floating LNG import terminal. The majority of FSRUs are semi-permanently moored to a land based or isolated jetty-like structure and receive natural gas in a liquefied state from LNG carriers (LNGC) that berth alongside in a moored ship-to-ship (STS) configuration.

An important consideration to ensure the success of these increasingly prevalent projects is the need for the FSRU, jetty and LNGC to be considered holistically in the design phase. To achieve efficient operation, docking and mooring solutions between FSRU, jetty and LNGC should be seamlessly integrated and developed mutually inclusively.

However, we are often finding demarcation in design of the mooring interfaces between the FSRU and jetty, and between the FSRU and LNGC.  Unfortunately, the ‘greyness’ of technical specifications and the split of key components within mooring and berthing packages can often lead to interface or integration  incompatibilities once the FSRU is in operation.

With the FSRU’s development entrusted to a dedicated ship designer, and the jetty being designed separately, the interfaces between the FLNG, jetty and LNGC need careful consideration with regard to the interface protocols, communications methodology and the hardware that makes the physical connections. This is to ensure that all entities work seamlessly together to avoid operational issues.

The FSRU vessel, rather than the jetty, will generally be the central control centre for loading operations and the consolidation point for mooring tension, met ocean monitoring, emergency mooring release and a host of other ship to ship and ship to shore facilities.  As such, the jetty and LNGC’s operations are dependent on the FSRU, as the efficiency of the FSRU itself is dependent on smooth operations between the other two entities.

Class Rules apply to the construction and equipment installed on the FSRU, however, they are generally not applicable to the design of the jetty or the mooring system.   Marine guidelines published by OCIMF and SIGTTO cover recommendations for both jetty and vessel but these are not mandatory. It is therefore important that there is a party that will cast a “birds eye view” over the entire facility, inclusively of all three entities.

The case of the Bahia LNG import terminal, which is currently under construction, could be considered an excellent model, since both the FSRU and jetty side design have been considered holistically by all the key stakeholders. Our OIM team have worked closely with the relevant parties to provide an integrated docking and mooring solution that should satisfy the operational needs of the jetty, FSRU and LNGC.

Having had an overview of the design requirements for both, we have been able to add value to the project by providing our input across both FSRU and jetty facility designers and this should ensure that the systems operational interfaces are aligned and considered well before the construction stage.

Any modifications or changes needed once the FSRU is in service will be costly and potentially impractical to implement.  Such problems are easily avoided when the shared needs of FSRU, jetty and LNGC are considered holistically and developed to complement each other at the design stage.