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: Click to share on X (Opens in new window) X Click to share on Facebook (Opens in new window) Facebook Click to share on WhatsApp (Opens in new window) WhatsApp More Click to share on LinkedIn (Opens in new window) LinkedIn Click to share on Tumblr (Opens in new window) Tumblr