General Dynamics' Charleston (S.C.) Facility will fabricate components for four offshore drilling rigs under a $33-million contract from Bailey & Shannon Drilling Company, Inc. of Stafford, Texas. The award involves construction of major portions of steel work on the rigs.

The components will be used in jackup drilling rigs with a 16,000-foot drilling capability and in workover rigs capable of drilling to 25,000-foot depths. The rigs will be used off the Gulf Coast.

This is the second contract that General Dynamics has received for major portions of steel work on offshore drilling rigs in four months. Last December, the firm was awarded a contract for components for two rigs for the same owner. The new contract work will begin late this year, with delivery of the components scheduled in 1982.

The work will provide jobs for approximately 250 employees at the Charleston Facility. The new contract, along with other awards, has boosted the backlog at the facility from $8 million to $48 million since January.