Resolving Blockages in the International Outfall Interceptor: A KES Success Story

At Kary Environmental Services (KES), our team consistently demonstrates expertise in handling complex environmental and infrastructure challenges. One such case involved a blockage in the International Outfall Interceptor—a critical part of the city's sewer system. The blockage had caused a significant surcharge, but thanks to our innovative approach and advanced equipment, we were able to successfully resolve the issue. Here's a closer look at how we did it:

The Challenge

The blockage in the International Outfall Interceptor was obstructing the normal flow and creating excessive pressure. Our goal was to lower the interceptor's flow to a level that would allow for video surveillance of the line and pinpoint the source of the blockage. Once identified, we were able to clear the blockage, restoring functionality to the system.

The Solution: A Partial Bypass System

To address the problem, KES installed a custom-designed partial bypass system. The system was strategically configured to reduce the flow and allow for surveillance. Here's a breakdown of the setup:

Pump Setup:

- Manhole #33: We installed a 12-inch Pioneer pump with a 12-inch HDPE suction line, connecting it to the top of the existing 30-inch interceptor. This setup relieved the surcharge caused by the blockage.

- Manholes #32, #31, and #30: At each of these locations, we placed two 12-inch Pioneer pumps, connected via 18-inch HDPE suction lines to the invert of the existing 30-inch interceptor. These pumps helped to further reduce the flow in the line.

Discharge Lines:

- Manholes #30, #31, and #32: Three 18-inch HDPE DR 17 discharge lines were manifolded 20 feet downstream of Manhole #33.

- Manhole #33: A 12-inch discharge line was connected to the three 18-inch discharge lines, enabling a seamless flow diversion.

Discharge Points:

- One 18-inch discharge line flowed into Manhole #34.

- Two 18-inch discharge lines discharged into Manhole #35, ensuring the proper redirection of flow.

The Outcome

With the bypass system in place, we were able to reduce the flow in the interceptor sufficiently to perform video surveillance. This allowed our team to accurately identify the blockage. Once located, KES used a Jetter and heavy-duty saw attachment to break free the obstruction, clearing the line and restoring normal operations.

Materials Used:

- 6 x 12-inch Pioneer pumps

- 2,895 LF of fused 18-inch HDPE DR 21

- 12-inch HDPE suction line

- 18-inch HDPE DR 17 discharge lines

- Custom manifold system

A Proven Approach to Infrastructure Challenges

This project highlights KES's ability to tackle complex infrastructure issues with precision and advanced technology. By implementing a temporary bypass system, we not only solved the immediate problem but also provided a visual solution to pinpoint the blockage, ensuring the system could function smoothly once more.

At KES, we pride ourselves on delivering innovative, reliable solutions that protect public health, safety, and the environment. Stay tuned for more case studies and success stories on how we continue to push the boundaries of environmental service excellence.

Get in touch – we're here to help!

641 S. Drew St.

Mesa, AZ 85210

Phone: 480-945-0009

Email: [email protected]

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