Worker relines water pipeline

Water Authority Completes Pipeline 3 Relining in Mission Trails Regional Park

San Diego County Water Authority Operations and Maintenance staff recently completed a complex relining project on a section of Pipeline 3 in central San Diego, within Mission Trails Regional Park. Pipeline 3 traverses the western portion of the region from the Riverside County border in the north to Lower Otay Reservoir in the south.

Large-diameter pipelines operated by the Water Authority and its 24 member agencies extend approximately 310 miles to convey water throughout the region.

By relining pipes ahead of time or conducting timely repairs, the Water Authority and its member agencies avoid pipeline failures and improve the reliability of future water supplies. The proactive Pipeline 3 relining project is part of the asset management program to make preventative repairs to large-scale infrastructure.

Pipeline 3 Relining

In June 2020, O&M staff performed an inspection of Pipelines 3 and 4 within Mission Trails Park during a routine shutdown. They inspected an area of Pipeline 4 that had previously been repaired, and the repairs were found to have held up successfully. Pipeline 3 has similar characteristics to Pipeline 4 in that area, and during the shutdown, staff inspected and found a 32-foot section of pipeline that had sustained lining damage. Between August and September 2021, staff completed the complex repairs on Pipeline 3.

Operations and Maintenance teams collaborate, overcome challenges

“The project was challenging due to several geographical factors, including the distance of access structures from the damaged section and the steep grade of the hill that the section of pipeline traverses,” said David Hernandez, maintenance technician at the Water Authority. “Our asset management, facility maintenance, and mechanical maintenance teams collaborated closely to plan and execute the complex repairs.”

To begin the relining project, heavy concrete covers at access point structures were first removed to allow staff to access the pipeline. Piping and an air valve at the top and pumping well at the bottom of the hill were then removed to allow for safe access. Staff installed an atmospheric ventilation fan that moved fresh air into the pipeline. Once the piping and valves were removed, they were able to enter the pipeline.

Staff then hiked through the pipeline to perform a visual inspection and locate the damaged area. They located the broken lining section and loaded broken pieces into buckets and manually hauled the buckets to access structures. Then the metal pipeline was prepared for the application of new liner. Preparation of the pipe took several days – it involved carefully cutting out any remaining damaged liner, descaling rust from the metal, and cleaning up and wiping down the metal to prepare for new lining. O&M staff then mixed the new lining material – approximately 4,400 pounds of dry material was mixed and lifted over the course of the project. The new liner was then manually applied to the pipe, starting from the bottom half for traction and then applied up to the crown of the pipe. Finally, every inch of the new lining was carefully inspected.

Careful planning protects crews during critical repairs

The highly specialized work effort was performed in a safe and efficient manner due to careful planning and execution by the Water Authority’s O&M staff. Throughout the process, staff took multiple safety measures, including wearing personal protective equipment, having a confined space rescue team on standby, and tying hand and foot loops into a safety rope. The entire project took approximately one month. It will extend the lifetime of Pipeline 3, a crucial component to the region’s water supply.

Pipeline 5 Upgrades in North San Diego County Halfway Complete

This week, crews are installing a carbon fiber lining inside Pipeline 5 in North San Diego County between Fallbrook and Escondido. The work is essential to maintain the 96-inch pipeline that delivers untreated water from Lake Skinner in southwest Riverside County to the Lower Otay Water Treatment Plant in southern San Diego County.

The work began at the end of March when Pipeline 5 was shut down for the installation of two internal steel bulkheads. The bulkheads allow the rest of the pipeline to stay in service while work is performed in an isolated section.

“Ensuring that water supplies continue to be reliable for all of the region’s 3.3 million residents and businesses is our priority,” said Jim Fisher, director of operations and maintenance at the Water Authority. “We are performing this essential repair to one of our largest pipelines to make sure that there are no interruptions in service to our member agencies.”

The carbon fiber installation is anticipated to be complete by the end of next week. Carbon fiber is a highly effective solution to reinforce the stressed areas of the pipe and extend its lifespan.

Proactive asset management program detects issues before they arise

Pipeline 5 was built in 1982 and is a part of the Water Authority’s Second Aqueduct, which includes Pipelines 3, 4 and 5.

In August of last year, Water Authority staff detected a leak in nearby Pipeline 4 at Moosa Creek and inspected the other two pipelines at that location. During that inspection, Pipeline 5 showed signs of stress, where the operating pressure within the pipe exceeds 400 pounds per square inch. A failure of the large-diameter pipeline would cause significant damage to the environment and nearby pipelines.

The proactive and timely repair to Pipeline 5 is part of the asset management program, which is a key element of the Water Authority’s commitment to providing a safe and reliable water supply to San Diego County. Making preventative repairs to large-scale infrastructure ensures that regional water service will continue uninterrupted.

After installation of the carbon fiber is complete, a second shutdown to remove the isolation bulkheads is anticipated to take place in May, after which the pipeline will return to normal service.

Protecting the health of essential workers during COVID-19

To ensure safety and health, most Water Authority employees have been working from their homes since mid-March. For those employees who need to be at work sites, strict precautions are being taken by limiting the number of people present, maintaining physical distance, requiring all employees to wear protective gear and providing hand washing stations where possible.