Tenneco Inc., as expected, said it plans to move its home base out of Houston and build new corporate headquarters in Greenwich, Conn., that will function as a "compact" executive management center.

The company said Friday that between 50 and 100 people may lose their jobs as a result of the move.The conglomerate, which has interests in natural gas, automotive parts and shipbuilding, said 30 employees will transfer to the new location from Tenneco's current Houston headquarters.

Tenneco also owns a 21 percent stake in Case Corp., a maker of agricultural and construction equipment. Since 1992, the work force at the Texas headquarters has dropped to 275 from 1,000 in 1991, the company said.

Its overall work force has fallen to 55,000 from 80,000 as part of the sale of Case and the Albright & Wilson chemicals unit.

The company said Tenneco Gas, which has a staff of 1,500, will continue to be based in Houston. The unit operates one of the nation's largest natural- gas pipeline systems.

Tenneco said other positions are expected to be filled mainly by workers hired in the area of Fairfield County, Conn., which is about 45 minutes from New York City.

The new headquarters will be small, with 70 positions, including support staff, it said, which will lower operating costs.

Construction of the headquarters site is expected to be completed in March of next year. It will be near the New York State border and the Westchester County Airport.