Pressure Relief Device

{
  "id": "MLC-T-ENV-022008",
  "term": "Pressure Relief Device",
  "field": "Environment",
  "definition": "1. Safety device used to prevent operating pressures from exceeding the maximum allowable working pressure of the process component. A common pressure relief device is a spring-loaded pressure relief valve.\n\n2. Safety device used to prevent operating pressures from exceeding the maximum allowable working pressure of the process equipment. A common pressure relief device is a spring-loaded pressure relief valve. Devices that are actuated either by a pressure of less than or equal to 2.5 pounds per square inch gauge or by a vacuum are not pressure relief devices. [40 CFR 63.1001 (CFR 2013)][40 CFR 63.1020 (CFR 2013)][40 CFR 63.1251 (CFR 2013)][40 CFR 65.2 (CFR 2013)][40 CFR 63.1361 (CFR 2013)] [40 CFR 98.6 (CFR 2013)]\n\n3. Valve, rupture disk, or similar device used only to release an unplanned, nonroutine discharge of gas from process equipment in order to avoid safety hazards or equipment damage. A pressure relief device discharge can result from an operator error, a malfunction such as a power failure or equipment failure, or other unexpected cause. Such devices include conventional, spring-actuated relief valves, balanced bellows relief valves, pilot-operated relief valves, rupture disks, and breaking, buckling, or shearing pin devices. [40 CFR 63.641 (CFR 2019)]\n\n4. Safety device used to prevent operating pressures from exceeding the maximum allowable working pressure of the process equipment. A common pressure relief device is a spring-loaded pressure relief valve. Devices that are actuated either by a pressure of less than or equal to 2.5 pounds per square inch gauge or by a vacuum are not pressure relief devices. This definition does not apply to ethylene production affected sources.\n\n5. Valve, rupture disk, or similar device used only to release an unplanned, nonroutine discharge of gas from process equipment in order to avoid safety hazards or equipment damage. A pressure relief device discharge can result from an operator error, a malfunction such as a power failure or equipment failure, or other unexpected cause. Such devices include conventional, spring-actuated relief valves, balanced bellows relief valves, pilot-operated relief valves, rupture disks, and breaking, buckling, or shearing pin devices. Devices that are actuated either by a pressure of less than or equal to 2.5 pounds per square inch gauge or by a vacuum are not pressure relief devices.[85 FR 40386; 40 CFR 63.1103 (CFR 2021)][85 FR 49084; 40 CFR 63.255 (CFR 2021)] [40 CFR 63.101 (CFR 2024)]",
  "references": [
    "40 CFR 63.12005 (CFR 2013)",
    "85 FR 41680; 40 CFR 63.7957 (CFR 2021)",
    "85 FR 40740; 40 CFR 63.2406 (CFR 2021)",
    "85 FR 40386; 40 CFR 63.1101 (CFR 2021)",
    "40 CFR 63.522 (CFR 2024)"
  ],
  "url": "https://mlchart.com/terminology/environment/pressure-relief-device/"
}