api2000API 2000 – 6th Edition (Appendix A = API 5th edition) • Tank volume • Liquid flow (pump-in-out) • Pump out • Temperature change • Average storage temperature • Vapour pressure • LatitudeOFFICE OF THE FEDERAL REGISTER. WASHINGTON, D.C.. Document Name: CFR Section(s):. Standards Body: e. American Petroleum Institute. API 2000: Venting Atmospheric