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June 6, 2022
10:45AM - 11:45AM
Reverse Flow of High Pressure Steam to Furnace Steam Drum Affecting Piping
Michael Polasek, Eastman
Expo A2
A steam cracking furnace was being started up after shutting down due to the electrical issues at the facility. The steam drum vents were opened to vent steam as well as the superheater vent valve, and high pressure steam from the main header was bypassed around the nonreturn valve to warm up the heater steam header. The control valve on the superheater vent was slowly closed to increase the steam drum pressure as the heater temperatures increased. The steam drum vent was left open and the warmup steam started flowing backwards through the convection section to the steam drum as the superheater vent was closed further. This condition was heating up the steam line toward its failure point since fuel was being added to the furnace to get it up to decoking temperatures. The steam pressure was at the point where steam would be sold out to the plant header when an elbow from the steam sales line going from the steam drum to the firebox failed releasing high pressure steam to the atmosphere.
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06/06/2022 10:45 AM
06/06/2022 11:45 AM
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Reverse Flow of High Pressure Steam to Furnace Steam Drum Affecting Piping
A steam cracking furnace was being started up after shutting down due to the electrical issues at the facility. The steam drum vents were opened to vent steam as well as the superheater vent valve, and high pressure steam from the main header was bypassed around the nonreturn valve to warm up the heater steam header. The control valve on the superheater vent was slowly closed to increase the steam drum pressure as the heater temperatures increased. The steam drum vent was left open and the warmup steam started flowing backwards through the convection section to the steam drum as the superheater vent was closed further. This condition was heating up the steam line toward its failure point since fuel was being added to the furnace to get it up to decoking temperatures. The steam pressure was at the point where steam would be sold out to the plant header when an elbow from the steam sales line going from the steam drum to the firebox failed releasing high pressure steam to the atmosphere.
Expo A2
