This month, the water district is completing the installation of a 48-inch auxiliary emergency pipeline at the plant’s lower basin near the Granada Gate.
The pipeline is designed as a safety feature to manage overflow in case of an emergency and is part of the plant’s wash water recovery facility. The pipeline is made from high-density polyethylene, a high-strength, corrosion-resistant thermoplastic used in physically demanding environments to transport resources with a high rate of flow such as water.
These pipes are fused together using a cost-effective, heat fusion joining technology called electrofusion, considered the most advanced method for joining polyethylene pipes. This process uses electrical heating to melt both the wall and surface of the pipe, creating a completely unified joint that becomes stronger than the pipe itself.
The electrofusion process requires a specialized piece of equipment, known as a McElroy Pit Bull. Each pipe is fastened into the Pit Bull where sliding and shaving tools carve away strands of pipe along the edge until it is perfectly smooth. When the pipe edges are flush, a hot plate is slid between the two segments to melt the thermoplastic, then the segments are pressed together to create a completely homogenous joint.
One advantage of electrofusion is that it has a small footprint and is specifically suited for tight installations where access is difficult, such as in trenches or around other pipes. Now that is tight!
We appreciate your patience as our work near the Granada Gate entrance winds down. Thank you for your understanding of any short delays while accessing the street. Paving repair work will take place in early November.