Three people were killed and 28 injured on Thursday in an explosion on a Thai PTT PCL gas transmission line in Samut Prakan province, southeast of Bangkok, the company said.
"PTT joined local rescue teams to bring the wounded to the hospital," PTT said in a statement.
Video from the scene showed flames leaping dozens of metres into the air and a large cloud of smoke hanging high above the facility.
The charred remains of houses and cars can also be seen.
PTT said that the fire had been brought under control and that gas going into that pipeline had been stopped.
Gas supplies had been restored for industrial customers and power plants, company official Chokchai Thanamethee told reporters.


Technical glitch with air traffic system at Delhi airport resolved
Indonesian mosque blasts injure dozens, teenage suspect identified
Over 200 flights delayed at Delhi airport after glitch in air traffic system
India top court says Air India crash report does not insinuate anything against pilot
Belgium's Liege airport temporarily halted again due to drone sighting