12" Gas Pipeline in City of San Diego

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Location:San Diego, CA
Client:San Diego Gas & Electric
Project Type:Gas Pipeline Replacement
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Project Description:

SPEC provided engineering design, project coordination, construction support, and project management services to Sempra Energy/SDG&E for the replacement and hydrotest of 2.5 miles of a 12-inch natural gas pipeline in the City of San Diego. The pipeline supplies natural gas to residents of the Mission Valley area, as a part of SDG&E’s distribution pipeline network. The project was undertaken as part of SDG&E’s Pipeline Safety Enhancement Plan (PSEP), and also included an isolation block valve, a horizontal directional drill (HDD) under Highway 163, and the Camino De La Reina undercrossing.

The work included the research of existing substructures and potential traffic impact for installation in Camino Del Rio S. In addition to the detailed mapping, engineering, and design for the 12-inch gas pipeline, SPEC was responsible for preparation of the encroachment/ excavation permit applications and draft of franchise/right-of-way agreements from the City of San Diego and Caltrans. SPEC worked closely with other consulting firms, the City of San Diego, MTS, and Caltrans throughout the project. SPEC prepared drawings for permits and construction, prepared record drawings at the end of construction, assisted with development of specifications and procurement of materials.

The engineering and design included analysis and layout of the HDD alignment, confirming constructability and calculating operational and installation stress within the HDD segment. In addition to the design of the replacement pipeline, the work included planning and procedures for the hydrostatic testing of the new replacement pipeline, specifying placement of temporary test heads and requirements for gas handling to isolate the 2.53 miles of pipeline.