American Petroleum Institute

Special-Purpose Gear Units for Refinery Service - Third Edition
 N STD 613

Annotation

This standard covers the minimum requirements for special-purpose, enclosed, precision single- and double-helical one- and two-stange speed increasers and reducers of parallet-shaft design for refinery services. It is primarily intended for gears that are in continuous service without installed spare equipment.

Note: The purchase of a spare set of gear rotors or a complete gear unit does not mean that the equipment is spared.

This standard includes related lubricating systems, controls, instrumentation, and other auxiliary equipment. This standard is not intended to apply to gears in general-purpose service, which are covered by API Standard 677 (inpreparation); to gears integral with other equipment; or to gears other than helical.

Note: A bullet (•) at the beginning of a paragraph indicates that a decision by the purchaser is required. These decisions should be indicated on the data sheets (see Appendix A) when provisions are made thereon; otherwise, they should be stated in the quotation request or in the order.

The following gear-driven applications may be covered by this standard:

a. Speed increasers, including those for centrifugal compressors, axial compressors, blowers, rotary positive displacement compressors, contactors, separators, and centrifugal pumps.

b. Speed reducers, including those for reciprocating compressors, rotary positive displacement compressors, contactors, centrifugal pumps, extruders, generators, and fans.

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