A 45-year-old man seriously burned himself in Waldorf Sunday while igniting a 270-gallon barrel that had been converted into a homemade barbecue grill, authorities said.

The incident occurred at about 6:15 a.m. in the 4000 block of Maguire Place, according to the Maryland Office of the State Fire Marshal. Authorities said the man was igniting the converted barrel when there was a sudden flash of flame.

The man sustained first- and second-degree burns to about 50 percent of his body, authorities said, but he was able to drive himself to the hospital and is expected to survive.