(EnergyAsia, November 23) — Singapore’s Keppel Singmarine Pte Ltd, a leading builder of offshore support vessels, said it has been awarded a contract worth S$230 million to build six new Anchor Handling Tug/Supply (AHTS) vessels for Gulfmark Offshore Inc. (US$1=S$1.7).   Two of these six 10,700 bhp AHTS vessels of 2,700 dwt each will be…