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RE: Coke drums

#7337

Anonymous

[quote]ORIGINAL: Guest

COKE DRUMS

Structure Valves
– Minimum purge steam to Structure valves
– Valves that reliably operate T/A to T/A
– Motor Actuators are Reliable
– No stray valve movements on MOV’s
– Eliminate effect of vibration on elec contacts
=> Power down between operation using the PLC interlock
=> Shell’s Mike Fynan noted that MOV batteries can lose memory when power is cut, therefore you need to maintain charging to the battery with the circuitry
=> Circuit boards can flex and crack due to vibration and thermal expansion/contraction
– need to use a hardened circuit board
– not possible to move circuit board to another location, since need to count turns for position
– Provide a secure clutch handle to protect MOV when it “torques out”
– Shell uses the Rotork IQ with the Velan Switch and Valvtron Ball

Top Deheading
– All automatic – Closure device, Opening, Stem Position, Closure
– Auto-switch cutting combo tool
=> Side Note: Delta Slide Valve plus an additional manual flange = Double Block
or use the new Delta two-point closure design?

Operations
– All remote-operated and automatic (valves, deheaders and cutting)
+ Cameras/Acoustics
– Make shot coke to reduce drain time and cutting

Design
– Concrete withstands thermal/cylic stress failure
– Coke chute ramps are of concrete instead of metal to reduce erosive wear

Emergency Egress
– Deluge, Barriers, or Baker Life Chute

Elevator
=> Dependable!!!
=> Size for turnaround or install separate maintenance elevator

Maintenance
– Platforms and Cranes provided as needed
– All remote-operated and automatic (valves, deheaders and cutting)
+ Cameras/Acoustics
– Make shot coke to reduce drain time and cutting
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