This standard covers the minimum requirements of special-purpose steam turbines for refinery services. These requirements include basic design@ materials@ and related lube-oil systems@ controls@ and auxiliary equipment.Note: A bullet (?)?at the beginning of a paragraph indicated that a decision by the purchaser is required. These decisions should be indicated on the data sheets (see Appendix A); otherwise they should be stated in the quotation request or in the order.Steam turbines are classified general-purpose or special-purpose according to service requirements as described in 1.1.2.1 and 1.1.2.2.General-purpose turbines are those horizontal or vertical turbines used to drive equipment that is usually spared@ is relatively small in size (power)@ or is in noncritical service. They are intended for applications where steam conditions will not exceed 600 pounds per square inch gauge (41 bar guage) pressure or 750 ?F (400 ?C) inlet temperature@ or both@ and where speed will not exceed 6000 revolutions per minute. Requirements for general-purpose turbines are defined in API Standard 611.Special-purpose turbines are those horizontal turbines used to drive equipment that is usually not spared@ is relatively large in size (power)@ or is in critical service. This category is not limited by steam conditions or turbine speed.
API STD 612-1987 history
2020API STD 612-2020 Petroleum, Petrochemical, and Natural Gas Industries—Steam Turbines— Special-purpose Applications (EIGHTH EDITION)
2014API STD 612-2014 Petroleum@ Petrochemical and Natural Gas Industries - Steam Turbines - Special-Purpose Applications (SEVENTH EDITION)
2005API STD 612-2005 Petroleum@ Petrochemical and Natural Gas Industries - Steam Turbines - Special-Purpose Applications (Sixth Edition)
2003API STD 612-2003 Petroleum@ Petrochemical and Natural Gas Industries - Steam Turbines - Special-Purpose Applications (Fifth Edition; Errata July 2003)
1995API STD 612-1995 Special-Purpose Steam Turbines for Petroleum@ Chemical@ and Gas Industry Services