A tender for a contract worth more than $25m has been floated by Abu Dhabi Gas Industries Co (Gasco) for modifications of its gas processing facilities at the coastal Bab field, Meed has reported. The project is part of the $1bn-plus Asab, Bab, Bu Hasa and Ruwais (ABBR) programme to increase production, processing and distribution capacity at the fields by 140 million cubic feet a day. Firms prequalified to bid on the contract include the UK's Costain, Paris-based Technip, and France's Litwin, the magazine reported.