The injured have been identified as Sushant Behera of Cuttack, Gunanindhi Bartti and Sanjib Patel of Balagir district. All are mechanics and have been engaged in repair work in the plant.
As per reports, the explosion took place from the cylinder when the repair work was underway at the plant to seal leakage in the gas pipeline.
On being informed, fire tenders reached the spot and rescued the injured trio.
The injured were rushed to the Community Health Centre (CHC) at CHC. Their condition was reportedly stable.
Meanwhile, police initiated a probe into the matter.