Firewater Line Replacement

CHEVRON REFINERY

Project Value: $1.2 Million

Background

The Firewater Line replacement program was a complex project involving civil and mechanical scopes. The project included the replacement of the existing line, which required extensive excavation, sand backfill, and paving.

Scope

Project management: set-up, and mobilization.
Material procurement as shown in specifications and contractor workbook
Fire-watches
Traffic control

Excavation, sand backfill, and paving
Trench plates
Layout and weld-bay piping prefabrication
Field piping fabrication, hydro-testing, installation, and tie-ins

Coat and wrap underground CS piping and flanges
Guard post installation
QAQC and document submittals
Clean-up and demobilization

Project Highlights

Completed 150 carbon steel welds
Completed 76 HDPE fusion welds
Installed 475LF of HDPE pipe
Excavated 270 cu yd of material
Imported 250 tons of clean rock fill, 110 tons of sand fill and 150 tons of aggregate base rock
Import level and compact 60 tons of asphaltic concrete paving
Coordinated excavation and mechanical scope to limit the risk of open dig sites

Challenges & Solutions

The firewater line project required being set underneath an operational street. Due to the activity of the street, it needed to be open for traffic during non-construction hours.

During the project, we encountered multiple subsurface obstructions. There was also a high-water table that could affect the excavation and installation of the new line.

With great coordination between the team, we were able to restore the roadway daily with trench plates and shoring to keep the road operational after hours.

With multiple obstructions found, we recommended and installed various piping modifications to the firewater line. Due to the high-water table, we ran pumps to pull out excess water to be able to continue work.