@AmarP welcome! RBM is very simplistic minded view of the refineries at Jamnagar needing periodic maintenance, also expansion to meet the demands from diversion of Russian crude via Indian shores. Also they seem capable and interested in more general infrastructure works. Valuations though are going to be expensive till order book gets implemented for the next one year or so.
Tinna is also expensive now but the EPR theme plus general market growth will be playing out stronger than expected for many years.