API 14B Gas Leak Rate Calculator

Compute subsurface safety valve gas leak rates using the Dranchuk–Abou–Kassem equation of state — per API RP 14B, 5th edition, consistent with Errata 1. Full numerical transparency: Sutton pseudo-criticals, Wichert–Aziz sour-gas correction, Newton+bisection DAK solver.

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  • ✓ 15 calculations
  • ✓ SI and USC unit systems
  • ✓ Full DAK Z-factor computation
  • ✗ No saved history

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  • ✓ Unlimited calculations
  • ✓ Persistent named spreadsheets
  • ✓ Full calculation history
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Based on American Petroleum Institute Recommended Practice 14B, 5th edition, October 2005. Derivation & methods →