Six workers were injured when the pipes near a compressor blasted at a private pharmaceutical company near Parawada in Visakhapatnam on Saturday, police said.
Inspector of Parawada police station P. Ramana said the workers of Glochem Industries received minor burns as it was not a big explosion.
The cause of the blast is yet to be ascertained.
All the injured have been admitted to a local hospital, he said.