Skip Navigation Minerals Management Service Minerals Management Service MMS Home pagesSearchMMS Topic IndexAbout MMSWhat’s NewOffshore Energy and Minerals Management United States Department of the Interior
TA&R Home PageTA&R International Home PagesTA&R Oil Spill Research HomeTA&R Research Projects HomeTA&R Workshops HomeTA&R Safety Home
Project Number 132
Date of Summary June 30, 1997
Subject Resistance of TLP Tendon Steel to the Ripple-Load Effect on Stress-Corrosion Cracking
Performing Activity Naval Research Laboratory
Principal Investigator Dr. Pete S. Pao
Contracting Agency Minerals Management Service
Estimated Completion Completed
Description The objective was to determine the susceptibility, of candidate steel and associated weldments on tension leg platforms (TLP) tendons to ripple-load cracking effect on stress-corrosion cracking in salt water. The project used parameters relevant to offshore applications--including those of stress ration, temperature and frequency. Also, the project acquired the data necessary for stress-corrosion cracking and corrosion-fatigue to implement a new theoretical model developed to make predictions of the ripple-load degradation in 3.5 percent NaCl Aqueous solution for TLP tendon steel, its weldments and heat-affected zone. The project also examined the resistance to ripple-load cracking in terms of the threshold level below which ripple-load cracking will not occur, as well as numerical integrations of time-to-failure curves for specific combination of material/structure and loading conditions. This project is an adjunct study to Project No. 63 completed in FY 1987.
Progress Completed

Reports
AA Pao, P. S. and Bayles R. A. Effect of Ripple Loads on Stress-Corrosion Cracking in Structural Steels, Final Report No. NRL ser6013/003, May 30, 1995, submitted by the Naval Research Laboratory, Washington, DC on June 2, 1995.

 

Privacy | Disclaimers | Accessibility | Topic Index | FOIA

Last Updated: 07/22/2008, 06:29 PM

PDF.