An employee was walking toward the company vehicle when he noticed that there was oxygen gas venting on the side of the van. He opened the tri-cock valve to bleed the pressure down from 120 PSI, opened the doors to vent the van for about 5 minutes, and then closed the doors. As he walked across the parking lot, he lit a cigarette lighter, which caused a flame to ignite on his left shirt sleeve. He suffered second and third degree burns to his chest and underarms, requiring hospitalization.