Shipping Corporation of India (SCI) has signed contracts for construction and delivery of four Panamax bulk carriers with STX Shipyard, reports said.These vessels would be of higher capacity in the Panamax size range with 80,655 DWT each compared to the conventional Panamax vessels of 75,000 dwt.. SCI has embarked upon a fleet acquisition plan and with signing of this contract, has 32 vessels of 1.44mn GT on order. This include all types of vessels, i.e. crude oil carriers including 2 VLCCs, product tankers, dry bulk carriers, cellular container vessels and offshore supply vessels.