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Salas O’Brien LLC in Santa Ana has acquired a Houston, Texas-based engineering firm.

The company plans to change its name once it folds Kalmans Marshall Engineering Inc. into its operations, continuing as KME Salas O’Brien LLC.

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The deal added 55 people to Salas O’Brien’s roster, for a total of 170 employees.

The acquisition will increase the Santa Ana-based engineering firm’s annual billings from $19 million to $30 million, and expand its total number of offices from nine to 12, according to Chief Executive Darin Anderson.

“This is a significant milestone for Salas O’Brien,” Anderson said. “This combination enables us to serve our national clients even more effectively.”