Officials at the Pacific States Cast Iron Pipe Company say the plant will not re-open until the investigations into Sunday night's fiery explosion are finished.
Just after 10 p.m. an explosion rocked the Utah County plant and homes up and down the valley and injured 11 employees.
"At this point, the accident is under investigation," General Manager John Balian said in a statement. "We have been in touch with our injured employees and their families and will do everything within our power to insure their needs are met during this difficult time."
Nine of the employees injured were released hours after being taken to Utah Valley Regional Medical Center. But two, Tim Beardall and Gustavo Cervantes, were flown to University Hospital's burn unit for further treatment.
Cervantes is expected to be released today but Beardall does not have a release date yet.
The explosion is initially believed to have been caused by calcium carbide mixing with water, which created a highly flammable gas, said Utah County Sheriff's Sgt. Spencer Cannon.
"We have notified all federal, state and local agencies of the incident and will continue to provide these reporting agencies with updates and answer all questions they might have," Balian said.The cast-iron factory has been operating since 1926 under its parent company, McWane Inc., based in Alabama.