Tenneco Gas to Develop 470-Mile Pipeline: Tenneco Inc.'s gas unit will also run the $170-million project in Queensland state. The 16-inch-diameter natural gas pipeline will connect reserves in southwest Queensland with existing pipelines serving the cities of Brisbane and Gladstone, the Houston-based company said. Construction is expected to begin in June and the pipe is expected to begin carrying gas by the end of 1996. The company said the project is its largest investment since it decided on a redeployment strategy late last year. The Queensland operation will serve as a base for Tenneco Gas' future operations in Asia.