Relief Valve Sizing Tool (API 520)Relief Valve Sizing (API 520) Relieving Pressure (psia) Temperature (°R) Molecular Weight Z (Compressibility Factor) K (Heat Capacity Ratio) Flow Rate (lb/hr) Discharge Coefficient (typically 0.975) Calculate Relief Area Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Share on WhatsApp (Opens in new window) WhatsApp More Share on LinkedIn (Opens in new window) LinkedIn Share on Tumblr (Opens in new window) Tumblr