Galveston officials confirmed the incident happened at about 3 p.m. at Texas International Terminals on Old Port Industrial Road.
Officials said the incident happened while the workers were doing maintenance work on equipment at the facility.
The Galveston Fire Department said that once crews responded, the fire was no longer active, and no leaks were found.
The workers were taken to the hospital with injuries. Galveston FD said three of the workers sustained burns, while the other two had non-burn-related injuries.
Authorities said there is no danger to the public as firefighters gather information at the scene.
It's unclear what led to the incident, but an investigation is ongoing to ensure all safety protocols were taken.