Quash Commissioning Quandaries Problems in testing a tank underscore larger issues

摘要

REVAMP COMMISSIONING The troubleshooting request fails to mention the pressure/vacuum relief system configuration and the vessel vacuum rating,nor specify explicitly whether this is an over-pressure rupture or a tear from vacuum collapse.The problem statement implies it could have been either.Regardless,formal constraints for under-and over-pressure are needed during the commissioning/startup phase.In other words,the steam supply crosstie to the vessel and the method to limit flow/pressure would be established by engineering calculation and the connections,depressuriza-tion,padding and vents sized and specified in the commissioning/startup procedures,so that the relief system is not overwhelmed,unsafe conditions are prevented and commissioning steps are of an acceptable duration.Even if not required by process safety management,consider a rigorous safety review(process hazard analysis)of the commissioning procedures following a standard methodology.