API Std 521 Technical Regulation: Pressure-relieving and Depressuring Systems Design
The API Std 521 standard establishes engineering protocols for the design, operation, and selection of equipment in pressure-relieving systems. The regulation is focused on ensuring industrial safety at oil refining, petrochemical, gas production facilities, and liquefied natural gas (LNG) infrastructure. EV Group China specialists recommend using these provisions to minimize risks when selecting system configurations that correspond to the specific operating conditions at particular production sites.
The document contains mandatory requirements and expert recommendations on the following critical aspects of engineering activity:
- Analysis and identification of root causes for overpressure in process circuits.
- Methodology for calculating individual capacity indicators during pressure relief.
- Design and selection of components for disposal systems, including piping, separation vessels, flare systems, and vent stack systems.
It is important to note that this standard does not apply to direct-fired steam boilers.