1Date of Issue: May 2008 Affected Publication: API Standard 611, General-purpose Steam Turbines for Petroleum, Chemical, and Gas Industry Services, Fifth Edition, March 2008ERRATA Foreward, Insert the Following Text:Shall: As used in a standard, “shall” denotes a minimum requirement in order to conform to the specification.Should: As used in a standard, “should” denotes a recommendation or that which is advised but not required in order to conform to the specification.