Integrated Mooring and Riser Design: Reliability Analysis Methodology and Preliminary Results

1999 ◽  
Author(s):  
P. Goodwin ◽  
R.V. Ahilan ◽  
K. Kavanagh ◽  
A. Connaire
Keyword(s):  
Reliability Analysis ◽  
Preliminary Results ◽  
Analysis Methodology ◽  
Design Reliability ◽  
Riser Design

Strength Performance of Steel Catenary Riser Using Short Term and Long Term Analysis Methodologies

2016 ◽  
Author(s):  
Feng Wang ◽  
Roger Burke ◽  
Anil Sablok ◽  
Kristoffer H. Aronsen ◽  
Oddgeir Dalane
Keyword(s):  
Bending Moment ◽  
Current Profile ◽  
Short Term ◽  
Sea State ◽  
Strength Performance ◽  
Steel Catenary Riser ◽  
Analysis Methodology ◽  
Riser Design ◽  
Term Analysis

Strength performance of a steel catenary riser tied back to a Spar is presented based on long term and short term analysis methodologies. The focus of the study is on response in the riser touch down zone, which is found to be the critical region based on short term analysis results. Short term riser response in design storms is computed based on multiple realizations of computed vessel motions with various return periods. Long term riser response is based on vessel motions for a set of 45,000 sea states, each lasting three hours. The metocean criteria for each sea state is computed based on fifty six years of hindcast wind and wave data. A randomly selected current profile is used in the long term riser analysis for each sea state. Weibull fitting is used to compute the extreme riser response from the response of the 45,000 sea states. Long term analysis results in the touch down zone, including maximum bending moment, minimum effective tension, and maximum utilization using DNV-OS-F201, are compared against those from the short term analysis. The comparison indicates that the short term analysis methodology normally followed in riser design is conservative compared to the more accurate, but computationally more expensive, long term analysis methods. The study also investigates the important role that current plays in the strength performance of the riser in the touch down zone.

Steel Catenary Riser Design Based on Prescribed Motions From Coupled Analysis Methodology

2008 ◽  
Author(s):  
Marcos Vinicius Rodrigues ◽  
Vigleik L. Hansen ◽  
Rodrigo Almeida Bahiense ◽  
Celso Velasco Raposo
Keyword(s):  
Coupled Analysis ◽  
Steel Catenary Riser ◽  
Analysis Methodology ◽  
Riser Design

Drilling Riser Design and Analysis for Deepwater Applications

2013 ◽  
Author(s):  
Yongming Cheng ◽  
Tao Qi
Keyword(s):  
High Pressure ◽  
Production Systems ◽  
Dynamic Performance ◽  
Design Procedure ◽  
Dynamic Strength ◽  
Low Pressure ◽  
Strength Analysis ◽  
Global Dynamic ◽  
Analysis Methodology ◽  
Riser Design

A riser is a fluid conduit from subsea equipment to surface floating production systems such as spars, TLPs, and semi-submersibles. It is a key component in a drilling and producing system. Drilling risers include the applications in marine drilling (low pressure) and tie-back drilling (high pressure). This paper discusses drilling riser design and analysis for a deepwater application. This paper first discusses the configuration of marine drilling and tie-back drilling risers. It then presents the drilling riser design procedure and analysis methodology. The riser design and analysis cover the riser tensioner setting, marine operation window, strength and fatigue, etc. A marine drilling riser example is used in the paper to demonstrate the design and analysis for a deepwater application. This paper shows the dynamic strength analysis results for the riser. It then identifies governing locations for the riser design. A tie-back drilling riser example is also provided to illustrate its global dynamic performance. This paper finally discusses the design and analysis challenges of a drilling riser for a deepwater application.

scholarly journals In Situ X-Ray Study of Phase Transformations in Ti-Nb-Based SMA under Variable Stress-Temperature Conditions: Preliminary Results

2013 ◽  
Vol 738-739 ◽  
pp. 87-91 ◽  
Author(s):  
Sergey Dubinskiy ◽  
Vladimir Brailovski ◽  
Sergey Prokoshkin ◽  
Karine Inaekyan
Keyword(s):  
Phase Transformations ◽  
Biomedical Application ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preliminary Results ◽  
Analysis Methodology ◽  
Thermal Chamber ◽  
Working Principle ◽  
Sma Actuator

The technique and preliminary results of in situ X-ray diffraction analysis of the martensitic transformation in the newly developed Ti-Nb-Zr SMA for biomedical application are presented. To perform the in situ analysis, an original tensile stage, powered by a Ti-Ni SMA actuator and fit within the “TTK450” thermal chamber of a “PANalytical X’Pert Pro” diffractometer is designed, manufactured and validated. The tensile stage working principle and analysis methodology are described in detail. Preliminary results obtained during in-situ X-ray analysis of the phase transformations in Ti-Nb-Zr SMA are also presented.

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