OUR BRICKLAYER WAS IN A 70'FT. SAND DRYER, ALONG WITH OTHER TRADESMEN FROM OTHER COMPANIES, WHO STARTED THEIR WORK PRIOR TO OUR ARRIVAL. WHILE PERFORMING REPAIRS TO THE FIREBRICK. IN THE COURSE OF WELDING ANCHOR PINS FOR THE BRICKS, AFTER INSTALLING THE THIRD ANCHOR, AN APPARENT NATURAL GAS POCKET IGNITED, BURNING OUR BRICKLAYERS ARM, BACK AND TOP OF HIS HEAD.