- ENGINEERING INFO
- CASE STUDIES
Tripler Army Medical Center, Schofield Barracks, and Wheeler Army Air Field (AAF) are U.S. Army installations located on the island of Oahu, Hawaii. Combined, these facilities cover over 17,500 acres. Schofield Barracks was established in 1908 to provide mobile defense of Pearl Harbor and the entire island of Oahu. It has been home to the 25th Infantry Division since 1941, as well as the Command Headquarters for the United States Army in Hawaii. Wheeler AAF is a National Historic Landmark, designated as such for its role in the Japanese attack on Pearl Harbor on December 7, 1941. Currently Schofield and Wheeler jointly support over 140,000 soldiers, civilians, contractors, and family members. These installations were established to provide strategic defense of the United States and continue to do so to this day.
For over a decade, the U.S. Army has had responsibility for maintaining the aging infrastructure of its Oahu bases while also expanding capacity to support ongoing growth required to meet current day defense demands.
|Pipeline Details and Program Summary|
|Property Owner:||U.S. Army / Department of Defense|
|Utility Owner:||Aqua Engineers|
|Project:||Sewer Upgrades 2007 - 2015|
|Location:||Schofield Barracks / Wheeler Army Air Field / Tripler Army Medical Center|
|Pipe:||62,000 LF of, 4" - 24" Fusible PVC®|
|Installation:||Open-Cut, Horizontal Directional Drilling|
Based on hydraulic models dating back to 2002 covering portions of the wastewater system, the U.S. Army Department of Public Works (DPW) proposed sewer upgrades to address surcharging in the collection system. Aqua Engineers - which took over the ownership and operation of the U.S. Army wastewater collection systems on Oahu from the DPW in 2004 through the award of a privatization contract - answered this challenge by implementing extensive utility upgrades to meet current and future needs. It was important to Aqua to design and build these system upgrades using materials that would function for their full design life with little to no maintenance or rehabilitation.
David T. Paul, P.E., an engineer for Aqua Engineers, commented, "Fusible PVC® pipe is free of gasketed joints between manholes, is non-corrosive, and is a tough material." He went on to explain, "Other projects Aqua has executed demonstrated that, with the right contractors bidding, there can be no cost difference between installing Fusible PVC® pipe versus bell-and- spigot PVC pipe."
The primary installation method for the majority of the military utility work on Oahu has been open-cut. As a result, engineers and end-users typically compare bell-and-spigot pipe to fused-joint pipe when designing projects. The benefits of a monolithic, fused-joint PVC pipe system clearly present the best value for long-term ownership needs.
The following factors were considered by Aqua Engineers when evaluating which pipe product would provide the best value for its piping upgrades:
Aqua Engineers concluded that installation of Fusible PVC® pipe will provide the best value for its utility upgrades. Fusible PVC® pipe was selected for its sustainable attributes and life cycle performance cost benefits over the long-term duration of Aqua's privatization projects.
To date, Fusible PVC® pipe has been utilized on seven Army base projects on Oahu, and Aqua Engineers continues to select Fusible PVC® pipe for its rehabilitation and replacement programs