The latter Section of the twentieth Century saw the introduction of extra stringent boiler manufacturing criteria, particularly in relation to welding know-how and inspection, and also the evolution of electronic control programs that now provide an unsurpassed degree of trustworthiness. The modern, micro-processor based mostly, higher-integrity, "Boiler Command Method" (BCS) http://edgarepblv.educationalimpactblog.com/27597075/contemporary-packaged-boiler-procedure-routine-maintenance-and-coaching