After Mexico City Earthquake, the PEMEX (Petroleos Mexicanos) Refiney located in Salina Cruz, Oaxaca, Mexico required a shut down to inspect some vapor lines connected to turbines, steel structures and foundation. This system has been operating for 40 years without any problems.
After a visual inspection on the lines, it was found out that several spring supports are not working or are not set properly. In order to design and size the springs, a Piping Stress analysis was performed. The calculation shows several elements overstressed and the loads on nozzles exceding the allowable loads.
For safety requirements, the operator has decided to replace all the spring supports based on the stress analysis results.
As stress engineers, how can we justify that this system is failing according to Autopipe but it has worked for over 40 years without any issues?
The earthquake caused damage in the Mexican states of Puebla and Morelos and in the Greater Mexico City area, including the collapse of more than 40 buildings. 370 people were killed by the earthquake and related building collapses, including 228 in Mexico City, and more than 6,000 were injured. I was looking for essay proofreading and editing and found a team of experts who helped me out and get quality work.