Q2. What Are the Construction Stages of Offshore Structure?

Constructability of Offshore Structure

Unit-1

Q1. Define what is meant by constructability of offshore structure?

Q2. What are the construction stages of offshore structure?

Q3. Write necessary principles for constructability of offshore structure.

Q4. With neat sketch explain the launching operation of Jacket structure.

Q5. Explain assembly and jointing afloat.

Q6. What are different kinds of material used for offshore structure construction? Name few corrosion resistant materials.

Q7. Explain risk and reliability evaluation for offshore structure.

Q8. Consider yourself as an Engineering graduate from AMET University in NA and OE. What are the salient points you will keep in mind before installing any deep water offshore structure.

Q9. Write different deck installation technique for fixed offshore structure.

Q10.Write installation sequence, transportation, load out, deck modular installation for jacket structure.

Unit-2

Q1. Write several factors which affects significantly construction in deep sea.

Q2. Write several considerations and phenomenon for deep sea operation?

Q3. What is corrosion? Name few corrosion resistant materials and technique to protect the materials from corrosion.

Q4. Write salient points related to function, component, static stability, and Natural time period, of articulated tower.

Q5. Draw a neat sketch of TLP and explain in context of its function, static stability, and Natural time period.

Q6. Draw a neat sketch of FPSO and explain its components, static ability, and Natural heave time period and Pitch

Q7. Draw a neat sketch of Spar and explain function, function of components, natural heave and pitch period, static stability.

Q8. What are the different kinds of mooring system differentiate between them very briefly.

Q9. What are the different kinds of anchor system? What are their advantages and disadvantages?

Q10. Write the differences between catenary and taut mooring line with application.

Q11. What are the different material used in mooring lines, and write their advantages and disadvantages.

Q12. Write EOM for floating buoy in sway motion, under catenary mooring. And describe each individual component of EOM considering the system to be uncoupled SDOF system.

Q13. Explain with neat sketch different kinds of mooring buoys (i) SALM, (ii) ALC, (iii) Fixed tower, (iv) CALM.

Q14. Derive expression for minimum catenary length (ls) and Tension (TH) considering static analysis of catenary mooring line, with gravity anchors.

Q15. Write what are the significant factors to be kept in mind for deep water mooring .

Q16.Q14. A platform is restrained from moving by two anchors with anchor lines of chain cable, Thelength l of the anchor line is 500m and the horizontal pre-tension TH is 200KN. The weight of chain in water is w=900N/m. Assume static environmental forces on platform. (a) What is the distance between anchors A and B (b) What is the tension at the platform (c) Find out how large environmental force on platform has to be to move anchor (d) Study the displacement of the platform as a function of the environmental force on the platform.

Q17. Write analytical expression for [Static analysis of Catenary mooring line], (a) Minimum length of catenary. (b) Horizontal distance from anchor point to attachment point to floating vessel. (c) Projection of Catenary mooring on Horizontal plane.

Q18. Derive expression for static analysis, with all assumptions. And plot sketch of THvs x in catenary mooring line.

Q19. Write DNV recommendations of material for mooring line.

Q20. What are the different kinds of pipe laying method write their advantages and disadvantages.

Q21. Write short note on bridge piers and sea floor well completions.

Unit-3

Q1. Explain briefly different methods of removal of piled structure in shallow water.

Q2. In case foundation of silts and sand sea bed condition, how piled structure can be removed explain briefly.

Q3. Explain step wise sequence of removal of piled structure (shallow water) for (i) Sands, (ii) if pile has been frozen.

Q4. Write short note on what are the problems faced during uninstallation of offshore structures.

Q5. Give minimum four points why it is necessary to uninstall offshore platform once its service life is over.

Q6. What are the important scenario’s which must be adapted for removal of offshore structure.

Q7. Give salient points for decommissioning of large Jacket structure.

Q8. Explain procedures involved in decommissioning of Frigg drilling platform.

Q9. Explain what are the difficulties associated with removal of Gravity based platform and write steps involved in decommissioning of GBS platform.

Q10. Write down the steps involved in removal of offshore gravity platform.

Q11. Write down the changes that might have occurred during service life of structure, which should be considered at the time of planning of removal of offshore structure.

Q12. Write brief description about several new developments in new salvage techniques.

Q13. Explain the various methods for removal of harbor structures.

Q14. Explain briefly procedure involved in removal of coastal structures.

Q15. Consider yourself an Engineering graduate from AMET university, what are the points you will keep in mind before decommissioning of deep water arctic structures.

Q16. What is VIV? How VIV can be reduced.

Q17. What is the importance of fatigue loading in concern to offshore structure? How fatigue can be reduced.

Q18. What are the different methods of deep water mooring system?

Q19. Describe what are the consideration that makes deep water mooring different from shallow water mooring.

Q20 Draw a neat sketch and describe installation of suction pile. Give an application.

Unit-4

Q1. Write a short note on sea ice and ice bergs in Arctic.

Q2. What are the atmospheric conditions that severely affect the offshore structure? Name them and mention their effects on offshore structure.

Q3. What are the effect of atmospheric icing on offshore structure and API recommendation to overcome the problem related to icing.

Q4. Explain in detail about Arctic seafloor and geotechnics.

Q5. Write short note on logistics and operations in Arctic.

Q6. Write salient points on Oceanographic in Arctic.

Q7.What are the positive and negative impacts of construction activities on ecology of Arctic area.

Q8. Write what are the several points to protect the slopes of offshore structure in Arctic region.

Q9. Explain in points what are the different earth work employed in Arctic to improve constructability of offshore structure.

Q10. What is ice structure, how they are built, what are the recommendations of API bulletin 2N, in section design of ice load.

Q11. With a neat sketch explain steel tower platforms for Arctic structure with highlighting modifications employed for arctic condition.

Q12. Write salient points about caisson retained islands.

Q13. Write short note on shallow water gravity base caissons.

Q14. Write short note on bottom founded deep water structures.

Q15. Draw a neat sketch and explain various deep water platforms and mooring line employed for these structures.

Q16. What is sea spectrum? Write analytical expression for various sea spectrumwith clearly indicating each term in the analytical expression.

Q17. Define wave, current, and tide write natural time period for them.

Q18. What does wind spectrum represent? Write analytical expression for several wind spectrums with clearly indicating each terms in expression.

Q19. Write difference between time domain and frequency domain analysis.

Q20. Draw a neat sketch of semi-submersible and explain function of each component.

Unit-5

Q1. What are the various modifications that can be employed before installing offshore Arctic marine structure.

Q2. What are the procedures to solve problems related to stability of offshore structure in marine (Arctic) structure?

Q3. How scour protection is provided in Arctic marine structure.

Q4. Write down the API bulletin 2N, section Active ice management recommendation.

Q5. What is corrosion? How corrosion failure can be protected for Arctic marine structure.

Q6. What are the effects of very low temperature on steel? Suggest some solution for these problems.

Q7. What are the major sources of problem for concrete structure? Suggest few solutions for these problems.

Q8. Explain several important considerations for constructability in areas which are subjected to heavy sea ice, bad weather.

Q9.Write a short note on current arctic developments.

Q10. Draw a neat sketch of SCR and explain where it is preferable to use and why.

Q11. Draw a neat sketch of TTR and explain where it is preferable to use and why.

Q12. Write the expression for finding Time period of FPSO in heave, roll, and Pitch.

Q13. What is static stability? How it is achieved in in FPSO.

Q14. Draw a neat sketch and write short note on different kinds of mooring line, materials used for manufacturing of these mooring lines.

Q15.Write the expression for Dynamic EOM for FPSO in Pitch motion and explain each terms. Consider the system to be uncoupled SDOF system.