This standard covers the minimum requirements for open@ simple@ and regenerative-cycle combustion gas turbine units for refinery services of mechanical drive@ generator drive@ or process gas generation. All auxiliary equipment required for operating@ starting@ and controlling gas turbine units and for turbine protection is either discussed directly in this standard or referred to in this standard through references to other publications. Specifically@ gas turbine units that are capable of continuous service firing gas or liquid fuel or both are covered by this standard. Note: A bullet (?) at the beginning of a paragraph indicates that either a decision is required or further information is to be provided by the purchaser. This information should be indicated on the data sheets (see Appendix A); otherwise it should be stated in the quotation request or in the order.