It is an auxiliary ship capable to carry 500 tonnes of fuel. It has seagoing capabilities and have all essential communication and navigation equipment. The vessel is classed under IRS (No: 39518) with Class notation : +SUL, for carriage of oil with flash point above 60 Degree.
INS Poshak is named after a previous auxiliary vessel of same name which served the Indian Navy. It was delivered to the Indian Navy on 18 June 2012. Poshak is first of a series of two barges being built by the Shalimar Works (1980) Ltd. M/s Shalimar Works secured the contract in November 2007 to manufacture two barges at a cost of INR 13.95 crores per barge. The basic design, detail construction design and consultancy for test and trial was provided by M/s Marine Consultants, Selimpur Road Kolkata.