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.


Israel reopens Gaza's Rafah border crossing to Egypt, with limits
Russian drone strike kills 12 miners in Ukraine
Five-year-old boy returns to Minnesota after ICE release
Reopening of Gaza's Rafah crossing expected Monday
Winter storm death toll in United States reaches 90
Pakistan says 145 militants killed after attacks in Balochistan
Israeli strikes kill 26 in Gaza, health officials say
US government starts likely brief shutdown as House fails to approve deal
