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Dr. S. Nallayarasu
IIT Madras

 

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Loads on Offshore Structures
Wind Loads; Wave and Current Loads; Calculation based on Maximum base Shear and Overturning Moments; Design Wave heights and Spectral Definition; Hydrodynamic Coefficients and Marine growth; Fatigue Load Definition and Joint Probability distribution; Seismic Loads.

Concepts of Fixed Platform Jacket and Deck
Jacket concepts, redundant framing arrangement; Launch and Lift jackets; Simple Deck configurations for Lift and float-over installations; In-service and Pre-service Loads and analysis.

Steel Tubular Member Design
Principles of WSD and LRFD; Allowable stresses and Partial Safety Factors; Tubular Members, Slenderness effects; Column Buckling, Design for Hydrostatic pressure; Design for combined axial and bending stresses (API RP 2A guidelines).

Tubular Joint Design for Static and Cyclic Loads
Simple tubular joints, design using allowable loads; stress concentration factors; S-N curves and fatigue damage calculations.

Submarine Pipelines and Risers
Route selection and Diameter / wall thickness calculations; Pipeline stability, free span calculations; Concrete coated pipelines and pipe-in-pipe insulated pipelines; Design using DNV 81 code.

Design against Accidental Loads (Fire, Blast and Collision)
Behavior of steel at elevated temperature; Fire Rating for Hydrocarbon fire; Design of structures for high  temperature; Blast Mitigation-Blast walls; Collision of Boats and energy absorption; Platform survival capacity and Plastic design methods.

S.No

Topics

No.of Hours

1

Loads on Offshore Structures

8

2

Concepts of Fixed Platform Jacket and Deck

6

3

Steel Tubular Member Design

6

4

Tubular Joint Design for Static and Cyclic Loads

6

5

Submarine Pipelines and Risers

8

6

Design against Accidental Loads (Fire, Blast and Collision)

8

Total

42

  1. Basic structural mechanics.

  2. Basic hydrodynamics.


Text Books:

  1. Hydrodynamics of Offshore Structures by S.K. Chakrabarti, Springer-Verlag

  2. Handbook of Offshore Engineering by S.K. Chakrabarti, Elseviers, 2005.

  3. Offshore pipelines by B. Gou, S. Song, J. Chacko and A. Ghalambor,  GPP Publishers,2006

  4. Structural Stability - Theory and Implementation by W.F.Chen and E.M.Lui by Elsevier

Reference:

  1. Interim Guidance Notes for the design of and protection of topside structures agains explosion and fire, Joint Industry Research, UK.



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