Vent Stream

Term · Environment · MLC-T-ENV-029644

1. Any gas stream discharged directly from a distillation facility to the atmosphere or indirectly to the atmosphere after diversion through other process equipment. The vent stream excludes relief valve discharges and equipment leaks including, but not limited to, pumps, compressors, and valves.

2. Any gas stream released to the atmosphere directly from an emission source or indirectly either through another piece of process equipment or a material recovery device that constitutes part of the normal recovery operations in a polymer process line where potential emissions are recovered for recycle or resale, and any gas stream directed to an air pollution control device. The emissions released from an air pollution control device are not considered a vent stream unless, as noted above, the control device is part of the normal material recovery operations in a polymer process line where potential emissions are recovered for recycle or resale.

3. Any gas stream, containing nitrogen which was introduced as air to the air oxidation reactor, released to the atmosphere directly from any air oxidation reactor recovery train or indirectly, after diversion through other process equipment. The vent stream excludes equipment leaks and relief valve discharges including, but not limited to, pumps, compressors, and valves.

4. Any gas stream discharged directly from a reactor process to the atmosphere or indirectly to the atmosphere after diversion through other process equipment. The vent stream excludes relief valve discharges and equipment leaks.

5. Used in reference to batch process vents, continuous process vents, and aggregate batch vent streams, means the emissions from one or more process vents.

6. Emissions from a process vent.

7. As used in reference to batch process vents, aggregate batch vent streams, continuous process vents, and storage vessels, means the emissions from that emission point.

8. As used in reference to batch front-end process vents, continuous front-end process vents, and aggregate batch vent streams, means the emissions from one or more process vents.

9. Gas stream, containing nitrogen which was introduced as air to the air oxidation reactor, released to the atmosphere directly from any air oxidation reactor recovery train or indirectly, after diversion through other process equipment. The vent stream excludes equipment leaks including, but not limited to, pumps, compressors, and valves.

10. As used in the process vent provisions, means the gas stream flowing through the process vent.

Table 1. Record
Identifier	MLC-T-ENV-029644
Field	Environment
References	40 CFR 60.661 (CFR 2013); 40 CFR 60.561 (CFR 2013); 40 CFR 60.611 (CFR 2013); 40 CFR 60.701 (CFR 2013); 40 CFR 63.1312 (CFR 2013); 40 CFR 63.1423 (CFR 2013); 40 CFR 63.1402 (CFR 2013); 40 CFR 63.482 (CFR 2018); 40 CFR 60.611a (CFR 2024); 40 CFR 63.101 (CFR 2024)

Record as JSON

{
  "id": "MLC-T-ENV-029644",
  "term": "Vent Stream",
  "field": "Environment",
  "definition": "1. Any gas stream discharged directly from a distillation facility to the atmosphere or indirectly to the atmosphere after diversion through other process equipment. The vent stream excludes relief valve discharges and equipment leaks including, but not limited to, pumps, compressors, and valves.\n\n2. Any gas stream released to the atmosphere directly from an emission source or indirectly either through another piece of process equipment or a material recovery device that constitutes part of the normal recovery operations in a polymer process line where potential emissions are recovered for recycle or resale, and any gas stream directed to an air pollution control device. The emissions released from an air pollution control device are not considered a vent stream unless, as noted above, the control device is part of the normal material recovery operations in a polymer process line where potential emissions are recovered for recycle or resale.\n\n3. Any gas stream, containing nitrogen which was introduced as air to the air oxidation reactor, released to the atmosphere directly from any air oxidation reactor recovery train or indirectly, after diversion through other process equipment. The vent stream excludes equipment leaks and relief valve discharges including, but not limited to, pumps, compressors, and valves.\n\n4. Any gas stream discharged directly from a reactor process to the atmosphere or indirectly to the atmosphere after diversion through other process equipment. The vent stream excludes relief valve discharges and equipment leaks.\n\n5. Used in reference to batch process vents, continuous process vents, and aggregate batch vent streams, means the emissions from one or more process vents.\n\n6. Emissions from a process vent.\n\n7. As used in reference to batch process vents, aggregate batch vent streams, continuous process vents, and storage vessels, means the emissions from that emission point.\n\n8. As used in reference to batch front-end process vents, continuous front-end process vents, and aggregate batch vent streams, means the emissions from one or more process vents.\n\n9. Gas stream, containing nitrogen which was introduced as air to the air oxidation reactor, released to the atmosphere directly from any air oxidation reactor recovery train or indirectly, after diversion through other process equipment. The vent stream excludes equipment leaks including, but not limited to, pumps, compressors, and valves.\n\n10. As used in the process vent provisions, means the gas stream flowing through the process vent.",
  "references": [
    "40 CFR 60.661 (CFR 2013)",
    "40 CFR 60.561 (CFR 2013)",
    "40 CFR 60.611 (CFR 2013)",
    "40 CFR 60.701 (CFR 2013)",
    "40 CFR 63.1312 (CFR 2013)",
    "40 CFR 63.1423 (CFR 2013)",
    "40 CFR 63.1402 (CFR 2013)",
    "40 CFR 63.482 (CFR 2018)",
    "40 CFR 60.611a (CFR 2024)",
    "40 CFR 63.101 (CFR 2024)"
  ],
  "url": "https://mlchart.com/terminology/environment/vent-stream/"
}

Record 29,644 of 30,736 in Environment terminology (MLC-0121). Request the full dataset.