The new $1.3 billion Levi’s® Stadium in Santa Clara, California, home to the NFL’s San Francisco 49ers is a model of sustainability, from its 27,000-square-foot (2508 square-meters) green roof and its owners suites decked out in reclaimed wood, to its farm-to-table concessions offerings. But none of the green features is more crucial to its operations than its use of recycled water for the flushing and irrigation systems.
PREPPING FOR THE “SUPER FLUSH”
Up to 85 percent of all water use in the 68,500-seat stadium will be from recycled water used for toilet flushing and playing field and green roof irrigation. The recycled-water pressure booster system built by California Hydronics Corp. (CHC) using Xylem’s Bell & Gossett brand products, taps into the Santa Clara Valley Water District water recycling system. This eliminates the need to use freshwater to flush toilets and to irrigate the natural grass field, green roof and other areas, which is of particular concern in drought-ridden California.
Volunteers coordinate plans for the “Big Flush.”
A recycled-water pressure booster system ensures adequate water is available when everyone goes to the bathroom at one time, like halftime at a football game. The “Super Flush,” a test of the system, was conducted in April 2014 to make sure the system was fully operational before the stadium opened. During the test, hundreds of workers and volunteers simultaneously flushed every toilet and urinal and turned on every sink in the stadium for about thirty minutes.
The B&G/CHC system solution handled it with flying colors.
Goulds Water Technology e-SV multistage centrifugal pumps proved a good fit for Levi’s Stadium’s recycled-water pressure booster system.
INNOVATIVE AND HIGH-PERFORMING
There are twice as many toilets in Levi’s® Stadium as there were in Candlestick Park, the 49ers’ former stadium, and the expectation is for significant water savings due to more efficient infrastructure. According to stadium water assessment estimates, 84 percent of all of the water used will be recycled water, which amounts to more than 42 million gallons (nearly 159 million liters) a year.
All of the Bell & Gossett products that went into the stadium are noted for their efficiency and were selected by Turner-Devcon, who drafted design development drawings and specs, along with the support of M-E Engineers. Plumbing contractors ACCO and FW Spencer completed the permit packages, which included the selection of Bell & Gossett centrifugal pumps and Goulds Water Technology e-SV multistage centrifugal pumps for the recycled-water pressure booster system.
“The system needed to be both innovative and high-performing,” says Kevin Coyne, vice president, FW Spencer. “Based on our successful history working with CHC, we knew the Bell & Gossett products would deliver on both fronts.”
Goulds Water Technology e-SV pumps installed in Levi’s Stadium.
A CLOSER LOOK AT EFFICIENCY
ACCO, the mechanical contractor for the project, procured a variety of Bell & Gossett products, including Rolairtrol air separators, Series 60 inline pumps, 1510 end suction base mounted pumps, and VSX double suction pumps for the hydronic systems. Xylem Bell & Gossett brazed plate and GPX gasketed plate and frame heat exchangers were specified and supplied for the project, offering the highest level of thermal efficiency for the condenser water system since majority of the air-conditioning equipment and food service coolers are water-cooled.
The stadium received Leadership in Energy & Environmental Design (LEED) Gold certification, a first for a NFL stadium. “Every detail regarding environmental sustainability was addressed during planning and construction,” says CHC’s Ken Carey. “This project is a bellwether for others to follow.”
B&G products installed in Levi’s Stadium.
READY FOR GAME DAY
The 49ers made their debut in Levi’s® Stadium during the NFL preseason in August 2014. The stadium is scheduled to host Super Bowl 50 on February 7, 2016, to a crowd of more than 70,000 people. With an increased focus on sustainability and efficiency, Levi’s Stadium will be ready for the fans. ■
About the Author
Mark Handzel is the vice president of product regulatory affairs and director of HVAC commercial buildings for Bell & Gossett, a Xylem Brand. Bell & Gossett is the world leader in energy efficient pumps. For more information, visit www.bellgossett.com.
MODERN PUMPING TODAY, January 2015
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