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DeKalb, IL -- Bringing its water system into the 21st century and complying with provincial standards were the main goals of the city of Saint John, New Brunswick, when it decided to install a new potable water tank.
The city’s old riveted tank built in 1935 had a capacity of 250,000 imperial gallons — not enough to meet the needs of the 25,000 customers in the city’s western section, especially in case of an emergency.
“We needed extra water to fight fires and for other emergency water situations,” said Dean Price, project engineer in the Saint John Municipal Operations and Engineering department. “We also needed to be able to meet peak demand in the middle of the day when we couldn’t get water fast enough from the lake.” The site is 250 feet above sea level.
The city’s tank selection process focused on a choice between bolted tanks and welded steel. “We considered a welded tank assembled on site, but didn’t want to have to do sandblasting and painting near the houses in the area,” Price explained. “We decided to go with a bolted tank because the panels are prepainted and shipped here and because the factory epoxy finish is expected to last longer.”
The city financed about half of the total cost, with additional funding coming from the provincial and federal governments. Site work began in 2001 and the infrastructure was built in 2002.
A seven-man crew from Gretario Engineered Storage in Innerkip, Ontario, began installation of the TecStore tank in July this year. The work went quickly except for delays caused by driving rain and wind.
The new tank is 64 feet in diameter and 56 feet high with a 2-foot side wall and a concrete base. Its capacity is 1.2 million imperial gallons. A small control building was also built nearby for reinjecting chlorine and keeping it at safe levels.
Completed in October, the new tank is painted a custom blue and has an aluminum geodesic dome. Adhesive letters spell out the Saint John name on the side. Extras include plastic caps over the bolts and a conical floor that allows dirt to be swept away when the water drains.
“This tank is a major part of our long-term water strategy that will bring us up to standard,” Price noted.
The new tank is in a residential area on a hill overlooking the harbor, so appearance was another important consideration. “It’s next to Martello Tower, the historic military lookout,” Price added. “The tower is a couple of hundred years old and was used in the First and Second World Wars to watch for ships and submarines along the coast. A lot of people visit the museum — and can see the tank.”
The old tank will be demolished in a few months. “The old paint is peeling, so we’re looking forward to seeing it come down,” Price said. After testing and cleaning are completed in late October, the new tank was scheduled to go on line in November.
Source: http://www.aquastore.com/
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