PSV Sizing utilizes equations from API Standard 520 Part I to determine required relief area or flow capacity of the pressure safety valve or Pressure Relief Valve (PSV, RV, or PRV). Calculations can be performed for vapor, liquid, or steam service. Default units are in US but users can solve in metric units.

Note that the calculator application is for general use only and is not responsible for errors or omission, misuse of the app, or bugs in the code.