Decoking Operation

{
  "id": "MLC-T-ENV-007455",
  "term": "Decoking Operation",
  "field": "Environment",
  "definition": "1. Sequence of steps conducted at the end of the delayed coking unit's cooling cycle to open the coke drum to the atmosphere in order to remove coke from the coke drum. Decoking operations begin at the end of the cooling cycle when steam released from the coke drum is no longer discharged via the unit's blowdown system but instead is vented directly to the atmosphere. Decoking operations include atmospheric depressuring (venting), deheading, draining, and decoking (coke cutting).\n\n2. Coke combustion activity that occurs inside the radiant tube(s) in the ethylene cracking furnace firebox. Coke combustion activities during decoking can also occur in other downstream equipment such as the process gas outlet piping and transfer line exchangers or quench points.",
  "references": [
    "40 CFR 63.641 (CFR 2016)",
    "85 FR 40386; 40 CFR 63.1103 (CFR 2021)"
  ],
  "url": "https://mlchart.com/terminology/environment/decoking-operation/"
}