Creación de Servidores Virtuales.

The yellow items in Figure 24, needed for the pull in procedure, were also used in the two previous projects built by IHC who will also arrange these equipment for Malikai. They have to be flexible on both ILT scenario’s because it is still not known which one will be used. The items are discussed hereafter and also is mentioned which configuration is used in the Moho and Ichthys projects.

Horizontal lifting arm

The lifting arm on top of the ILT is used to transport the ILT with a crane and put it in the correct position in front of the tendons for the pull in procedure. This arm should be designed such that it can work in combination with a link plate.

- Moho: The horizontal lifting arm is not ready to use in combination with a link plate. The end of the tendon piles must support the link plate but the lifting arm is located between the support plate of and the tendon pile so a modification of the horizontal lifting arm is needed.

- Ichthys: For Ichthys, also a link plate is used so the lifting arm is suitable to work with it. This lifting arm has a hole inside it at the location where the support plate must be in contact with the tendon pile.

𝑇𝑒𝑛𝑑𝑜𝑛

𝐼𝐿𝑇

𝐼𝐿𝑇 𝑆𝑢𝑝𝑝𝑜𝑟𝑡 𝐹𝑟𝑎𝑚𝑒

𝐻𝑜𝑟𝑖𝑧𝑜𝑛𝑡𝑎𝑙 𝐿𝑖𝑓𝑡𝑖𝑛𝑔 𝐴𝑟𝑚

𝐿𝑖𝑛𝑘 𝑃𝑙𝑎𝑡𝑒

𝑆𝑢𝑝𝑝𝑜𝑟𝑡

𝑃𝑙𝑎𝑡𝑒

𝑆𝑙𝑒𝑑𝑔𝑒

𝑃𝑢𝑙𝑙 𝐼𝑛 𝑐𝑎𝑏𝑙𝑒

𝐴𝑐𝑐𝑢𝑚𝑢𝑙𝑎𝑡𝑜𝑟

𝑇𝑟𝑎𝑛𝑠𝑝𝑜𝑛𝑑𝑒𝑟𝑠

(𝑖𝑛𝑠𝑖𝑑𝑒)

37 Sledge

The sledge must be designed such that it suits the ILT support frame where it slides over. This frame has the Moho sledge foot print.

- Moho: The ILT support frame from Moho is used for Malikai so the sliding frame will fit.

- Ichthys: Another ILT support frame is used in this project so should be modified that it will fit the new support frame.

Accumulator

Due to the waterdepth of Malikai an accumulator is needed.

- Moho: Located inside ILT

- Ichthys: Not included in the ILT, should be hired and added to the ILT Link Plate and Chain

The ILT needs to be equipped with a link plate as is explained in section 0 and should be checked to work with the tendon piles used for the Malikai project. The diameter of the tendon should correspond with the location of the support plate. A chain is needed to hold the link plate in the vertical position when it is in rest.

- Moho: There was no link plate or chain used for Moho project, this should be added to the ILT.

- Ichthys: ILT already contains a link plate and chain, only the diameter of the tendon pile should be checked with the link plate.

Transponders

The transponders are used to locate the ILT and tendon underwater when these are lowered down. For Malikai these must be integrated into the sledge for covering.

- Moho: The transponders were already located in the sledge.

- Ichthys: The transponders were located into the arms of the ILT and should be integrated into the sledge.

8.4

Conclusions

With IHC two scenarios must be discussed as there are still two ILT scenarios in this stage of the project:

- ILT-16/17, which are owned ILT’s by Heerema (same as Moho project)

- Rent ILT from IHC (same as Ichthys project)

38 In the following table are the actions for the two ILT scenarios summed for Heerema and IHC. It gives an overview which part should be taken from which previous project for each ILT option. When it says OK, the suitable parts for Malikai project are already incorporated in the ILT. All parts can be found in Figure 24.

Heerema’s scope:

ILT-16/17 (Heerema own) Rent ILT from IHC ILT Support Frame Moho project:

ILT support frame for 84’’ O.D. anchor mooring pile.

Moho project:

ILT support frame for 84’’ O.D. anchor mooring pile.

IHC’s scope:

ILT-16/17 (Heerema own) Rent ILT from IHC

Sledge OK Remove the sledge from the ILT and replace it by the one from the ILT- 16/17 (Moho project).

Horizontal Lifting Arm The arm should be modified such that it is not in between the support plate and the tendon as is done for the Ichthys project.

OK

Link Plate A link plate must be added to the ILT so it can work in combination with the split block lifting procedure. The same link plate is needed as in the Ichthys project. The diameter of the tendon piles (for supporting link plate) must be checked with the support plate of the link plate.

The diameter of the tendon piles (for supporting link plate) must be checked with the support plate of the link plate.

Chain A chain for supporting the link plate in rest must be attached to the plate and ILT, same as Ichthys project.

OK

Transponders OK Transponders are located into the arms of the ILT. For Malikai, these transponders need to be integrated into the sledge like on Moho project. Accumulator OK Because of the waterdepth, an

accumulator is needed and must be added to the front of the ILT like in the Moho project.

8.5

Recommendations

When an accumulator is attached to the front of the ILT, the sledge is probably too light because the C.o.G. can be in front of the sledge. To get a much more static design, either reinforce the sledge or build a new one. For both cases the Moho foot print needs to be obtained to work with the support frame.

39 From previous pull in procedures in the Moho project is learned that the ILT support frame is not strong enough to guide the ILT when it is located at the end of the frame as is shown in Figure 25. Due to the weight, the support beams were rotating so either make the support point of the beams closer to the tendon or use additional welds to lock the beams better in the support frame.

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9

Conclusions

The internship assignment contains five problems for the TLP installation which needs to be solved. This is done by designing new equipment or a modification of the layout used in the past. A summary of the problem definitions, final design and the results are written in this report. The specific conclusions for each design are already provided at the end of each chapter.

During the designing period, the final concept for the rod lock mechanism and bullnose guide were shown to the client with a presentation and discussion during the weekly meeting. With their approval, the final designs were made as is also done for the other problems. All designs were also presented and discussed with the Heerema field specialists so everything will work and fit during the installation. The corresponding technical drawings are made, reviewed and added to the design reports.

To show that every part, weld and installation equipment cannot fail, the unity check is introduced. After each calculation, the value for the check is given as can be seen in the detailed conclusions in the design chapters. All used items within the calculations are suitable for offshore transportation and installation purposes and the values are within acceptable limits. Detailed calculations are only written in the original Heerema design reports used within the Malikai project. These reports are all approved by Heerema engineers and ready to send to the client for their comments.

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10 Recommendations

All specific recommendations corresponding to each design are provided in the design chapters in this report. Here, the next steps in the design process are discussed where the other engineers can work on. At this point in time, the design reports and technical drawings are finished, reviewed by other Heerema engineers and signed off. The next step is to send the reports, including the drawings, to the client so they can gives their comments. They return the comments with a corresponding code:

- Code 1: Accepted

- Code 2: Accepted with comments

- Code 3: Not accepted, revise and resubmit

Within the internship period, the guide cone seafastening report is already code 2, updated with their comments and send back to the client. All other parts are ready to send for the first client review. Other structural engineers of the Malikai project have to survey these review cycles and update the reports where the drafter has to update the drawings.

The installation engineers have to provide the installation manuals which describes the working principles and the points of attention for the field engineers during the TLP installation. Besides that, the quality control (QC) engineer has to make checklists for all the equipment used and installation procedures. This is done to watch over the quality and safety and make sure that the field engineer checks everything before is it used.

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