PROPANE STORAGE TANK WORTHINESS ANALYSIS DUE TO SUBSIDENCE CONDITION

• Main Author: Samuel Bhagaskara, Nathan
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74890
• Institution: Institut Teknologi Bandung

80.000 m3 propane storage tank experienced subsidence during hydrotest. This condition causes a distortion on the outer tank shell and needs to be re-evaluated to check the worthiness of the storage tank to be operated again or fitness for service. Fitness for service procedure based on API 579-1/ASME FFS-1 is use as a guide to analyze the worthiness of the flaws tank due to unexpected loadings. The process begins with doing level 1 and level 2 analysis using the distorted tank shell measurement data. If necessary, level 3 analysis includes using complex numerical analysis. The result shows that out-of-roundness (RSF? RSFa) and out-of-plumbness (1200?????????????????) criteria by using level 1 and level 2 analysis is acceptable, but not with the bulge criteria so the analysis continued to elastic-plastic analysis at level 3. Level 3 analysis is done using finite element simulation/ The result shows that the stress occurred in the tank is already exceed the yield stress, but the tank is still acceptable due to plastic collapse, local failure, and collapse because of buckling criteria is still satisfied. Tank is still fit for services with some notes to be considered such as wind load, seismic load, and pressure is needed to include in the analysis. Tank shell also need to be reinforced and monitored at a regular intervals.