We recently discovered cracking in a steel stack that is part of a gas turbine/waste heat boiler unit at a refinery. The stack is only in service when the gas turbine is operating with the waste heat boiler shutdown (i.e. a bypass or auxiliary stack).
The stack in question is 9 ft diameter x...
I'm looking at a temporary project option to hot tap "fresh" 98 wt% sulfuric acid lines (material 316ss). Everything I've found in industry literature (API 2201, internal corporate guidelines, etc.) lists sulfuric acid service as a service NOT RECOMMENDED for hot tapping due to hazards...
