1.1 This specification1 covers water insoluble and oil soluble polyalkylene glycol based (PAG) lubricants used in gas turbine lubrication systems.

1.2 This specification is intended to define the properties of water insoluble or oil soluble polyalkylene glycol-based turbine lubricating oils that are functionally interchangeable with existing oils of this type, are compatible with most existing machinery components, and with appropriate field maintenance, will maintain their functional characteristics. Auxiliary systems, like hydraulics, gearboxes, and couplings, are also lubricated by the same lubrication systems.

1.3 This specification is intended to define only new lubricating fluids before it is installed in the machinery.

1.4 It is possible that other water insoluble and oil soluble polyalkylene glycol-based turbine lubricants that do not meet this specification may perform satisfactorily in some turbines.

1.5 This specification does not include API Group I-IV or non-PAG based API Group V oils. For mineral oil and synthetic (API group I, II, III, or IV) fluids used to lubricate steam or gas turbines, the user is referred to the current version of Specification D4304. The ISO 8068, DIN 51515-1, or DIN 51515-2 may also be of useful reference. For polyol ester fluids used to lubricate land-based gas turbines, the user is referred to the current version of military specification MIL-PRF-23699 for fluid performance requirements. For phosphate ester fluids used as turbine lubricants or steam turbine electro-hydraulic control (EHC) fluids, the user is referred to the current version of Specification D4293 for fluid performance requirements.

1.6 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.