Lawyers for two workers injured in the deadly Feb. 7 explosion at the Kleen Energy powerplant in Middletown, Conn., allege that “multiple” ignition sources were in operation while natural gas was being purged from the nearly $1-billion construction site. The suit, filed by Timothy Hilliker and Harold Thoma, electricians for Ducci Electric, Torrington, Conn., claims that welding and grinding operations were taking place at the time of the purge, with electricity on-site and a gas-fueled torch heater in use. “If you release a massive amount of natural gas and you have all of these ignition sources operative, you have the
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.