A group of Australian and United States investors have combined to acquire an interest of up to 70 per cent in the gas pipeline assets of Tenneco Energy Australia.

The deal, expected to be announced in the next two weeks, includes a majority interest in the 660 kilometre Moomba to Port Bonython petroleum liquids pipeline in South Australia and a similar stake in the just-completed Balera to Walumbilla gas pipeline stretching across southern Queensland.