With the rapid increase in energy demands in the country, imported fossil fuels are stored in large diameter tanks to meet the energy demands. Most of the storage tanks are in the coastal areas for ease of shifting and storing the fossil fuels. Due to poor ground conditions (soft soils) in coastal areas, most of the tanks are supported on piles. In this paper, a case study is presented pertaining to the performance of large diameter bored piles of 1.2 m diameter and 57 m in length. Ground conditions were challenging because of the presence of top 25 m soft clay layer followed by intermittent layers of dense sand and stiff clay up to the explored depth. Challenges with respect to design, installation, testing as well as limitations with respect to the applicability of static formula for estimating the pile capacity for larger diameter and longer piles are highlighted. Challenges with respect to evaluation of negative drag and its effect on pile capacities are presented. Numerical models are developed and validated with pile load test results. With the help of numerical and pile load test results, limitations in the IS code for evaluating the pile capacities for longer piles are highlighted. From pile load test results, the important aspects to be considered while designing larger diameter bored cast-in-situ piles are presented.