A tender for a new contract has been floated by Abu Dhabi's Zakum Development Co (Zadco), a subsidiary of state energy firm Abu Dhabi National Oil Co (Adnoc), as part of a $50m upgrade of its Zirku Island oil processing and distribution facilities, Meed has reported. The engineering, procurement and production (EPC) contract covers the construction of a new 12-inch pipeline to replace an existing transit route. The project is part of a wider scheme to upgrade the company's oily water treatment and disposal facilities. The contract is expected to be awarded before the end of the year.