Click Image to Enlarge The National 911 Memorial is designed
with two fountains that have the approximate footprint of the
original twin towers. FiberSystems Inc. (FSI) used phenolics in
the manufacture of large-diameter piping for the fountains. FSI
fabricated 4,300 lineal ft (1,311m) of 12-inch and 16-inch
(305-mm and 406-mm) diameter piping, manufactured via wet
filament winding. The fountains hold approximately 600,000
gal/2.7 million liters of water, which is recirculated and
treated at a rate of 30,000 gal/min (113,562 liters/min).
Source: FiberSystems Inc. FSI's pipe for the National 911
Memorial fountains comprise an inner layer of 30-percent glass-
reinforced vinyl ester and an outer layer of about 60 percent
glass-reinforced phenolic. Wall thickness throughout the entire
piping system ranges from 0.230 to 0.290 inch (5.8 to 7.4 mm).
Source: FiberSystems Inc. Phenolic resins, or resins formed by
an acid- or base-catalyzed condensation reaction of formaldehyde
and phenol, were the first commercially av