Sailing to the Bridge
Dave Brockman of Christiansburg got a waterview perspective of the George P. Coleman Bridge when he sailed past it on the York River with his wife Sharon. Dave works for Carter Caterpillar in Roanoke and helps service the hydraulic system that turns both spans of the bridge sideways. “A large powerhouse in each pylon runs four independent motors on wheels. Each takes 120 gallons per minute to flow in the hydraulic fluid at 3,000 PSI. There’s not a machine in North America that can test it at full load. Our test handles 60 gallons up to 6,000 PSI, which works fine.” Up above, we could hear the thunder of traffic crossing the steel grid.