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Hawaii Electric Company Installs 25,000' of FPVC® Pipe to Convey RO Reuse Water to New Kahe Power Plant

In July 2009, Hawaii Electric Company completed installation of its new reclaim water pipeline to transport RO reuse water from the Honouliuli Wastewater Treatment Plant (WWTP) to the Kahe Power Plant. The new pipeline will reduce Hawaii Electric's potable water consumption at the Kahe facility by more than 140,000 gallons per day, allowing the Honolulu Board of Water Supply (HBWS) to conserve potable water for other uses.

Underground Solutions, Inc. (UGSI) contracted with Road Bore Construction to provide UGSI's FPVC® pipe and fusion services for this critical pipeline. FPVC® pipe was installed via horizontal directional drilling (HDD) and direct-bury; passing through the Ko'Olina resort area and under Hawaii Department of Transportation right-of-ways.

Hawaii Electric Company, design engineer HDR, and Road Bore Construction determined that FPVC® pipe was the most suitable product for the pipeline after a detailed evaluation of both FPVC® and HDPE pipe. For each pipe size (8" and 12") FPVC® pipe provided the required ID and working pressure with an OD 20% to 30% lower than equivalent ID and pressure class HDPE pipe; reducing soil displacement by approximately 30% in the HDD sections. The ability to use readily available standard waterworks fittings was also attractive to HBWS, which had design oversight and input into the project. These considerations contributed to the design team's conclusion that FPVC® pipe would provide a lower overall installed pipeline cost as compared to HDPE pipe.

Hawaii Electric Company Project Manager Curtis Omura commented: "We made a commitment to help preserve our precious water resources, and Underground Solutions helped us make good on that commitment. FPVC® pipe was the right product for this project, allowing us to meet our deadlines and keep our commitments to our customers."

Dustin Griffith, Project Manager for Road Bore Construction, stated: "The project went extremely well. The UGSI team supported our work and we look forward to working with them again."

UGSI Contact: Rob Craw (925) 577-7566 (rcraw@undergroundsolutions.com)

Open Cut Installation

HDD Installation

Installation in Ko'Olina