Safety of a deep water marine riser under random loads.pdf

Proceedings of the Institution of
Civil Engineers
Maritime Engineering 160
December 2007 Issue MA4
Pages 175–183
doi: .
Paper 14927
Received 01/09/2006
Accepted 07/08/2007
Keywords: Rizwan A. Khan Suhail Ahmad
fatigue/offshore engineering/risk & Research Scolar, Department of Professor, Department of
probability analysis Applied Mechanics, Indian Applied Mechanics, Indian
Institute of Technology, Delhi, Institute of Technology, Delhi,
India India
Safety of a deep water marine riser under random loads
R. A. Khan BTech (civil), MTech (structure) and S. Ahmad MTech, PhD
The safety of a deep water marine riser subjected to high
1. INTRODUCTION
axial and bending stresses was addressed with respect to
potential fatigue failure. A three-dimensional non-linear For deep water oil and gas exploration, an offshore floating
dynamic analysis of a marine riser was carried out for production unit is usually employed based on a floating platform,
response calculations. The response histories so obtained semi-submersible on tension legs that receives oil from the sub-
were employed for the study of the fatigue reliability sea well via flexible or rigid piping systems, called risers. A riser is
analysis of the riser under random wave and random wave a long tubular steel structure with oil and drilling fluid in the inner
chamber and water outside