major refractory revamp in primary reformer in ammonia plant , service as per following description , repair & replace fire bricks and removal repl . of burner blocks as per sow a , burner block dismantling and installation as per sow b , dismantling and reinstallation of ceramic fiber module for roof of radiant chamer for the revamp of one primary reformer as per sow c , dismantling and reinstallation of ceramic fiber module above 6th burner outer walls for the primary reformer revamp of one primary reformer as per sow c , unit rate for supervisor ( manpower rates for additional refractory jobs ) , unit rate for mason ( manpower rates for additional refractory jobs ) , unit rate for carpenter ( manpower rates for additional refractory jobs ) , unit rate for helper ( manpower rates for additional refractory jobs ) , mobilization per person per trip