Process

[Anonymous]

~ Consider running between TAR’s with only spalling though a proactive approach

– EOR = 1175-1200degF
– 5 years between pigging

~ Delta Valve Info

– During an emergency shutdown, stagnant cooling water froze in the Delta Valve cooling box causing a bulge in the covers.
– Two instances of transition spool leakage at bottom flange face

~ Furnace Fouling

– Skin TI’s, Delta P

~ Reasons

– Feedstock CCR, Aromaticity, Salt
– Furnace Hot Spot, Flame Impingement, less XS02
– Process Low Velocity

~ Mitigation

– Chemicals
– CZ Alonizing – Inside
– Recycle
– Velocity Steam
– Metallurgy
– Furnace Design
– Preheat
– Outside Coating – Outside

~ No technology for venting

– Getting everyone away from the structure on a routine basis (unheading, cutting, switching)

~ Lowering pressure during venting of the drum

– EPA driven
– Options:
– Install liquid ring compressor
– Install injector

~ Foaming/Anti-foaming Injection

– Injection point 180 degrees from vapor outlet
– Carrier is HGO and LGO
– Throttle to hold pressure
– Standard outage one drum diameter

~ Minimum coking time

– 4 – 6 hours in the drum
– Achieve minimum temp of 910 to 920 for 30 minutes
– Restart coking process
– If too soon into drum, quench and drill

[Author]

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