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API Std 677 General-purpose, Extruder, and Epicyclic Gear Units for Petroleum, Chemical, and Gas Industry Services, Fourth Edition
standard by American Petroleum Institute, 09/01/2021
This standard covers the minimum requirements for general-purpose, enclosed single and multistage gear units incorporating parallel shaft spur, and helical gears for use in the petroleum, chemical, and gas industry services. General-purpose and extruder gears manufactured according to this standard are limited to pitch line velocities that do not exceed 60 m/s (12,000 ft/min).
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API STANDARD 677
FOURTH EDITION, SEPTEMBER 2021
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Scope 1
Normative References 1
Face Width-to-Diameter Ratio (b/dws) Limits 99
Maximum dmN Numbers for Rolling Element Bearings 51
Users of this standard should be aware that further or differing requirements may be needed for individual applications. This standard is not intended to inhibit a vendor from offering, or the purchaser from accepting, alternative equipment or engineering solutions for the individual application. This may be particularly applicable where there is innovative or developing technology. Where an alternative is offered, the vendor should identify any variations from this standard and provide details.
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General-purpose, Extruder, and Epicyclic Gear Units for Petroleum, Chemical, and Gas Industry Services
This standard covers the minimum requirements for general-purpose, enclosed single and multistage gear units incorporating parallel shaft spur, and helical gears for use in the petroleum, chemical, and gas industry services. General-purpose and extruder gears manufactured according to this standard are limited to pitch line velocities that do not exceed 60 m/s (12,000 ft/min).
The requirements for parallel shaft helical gears applied to extruder services are included in Section 9 of this standard.
The requirements for epicyclic gears driving equipment, such as electrical generators, centrifugal compressors, and pumps, are included in Section 10 of this standard.
This standard does not apply to gears in special-purpose service, which are covered in API 613, to gears integral with other equipment, or gears with noninvolute tooth forms.
NOTE General-purpose gears are applied in equipment trains that are usually spared, or are in noncritical service. Typical applications for which this standard is intended are cooling tower water pump systems, forced and induced draft fan systems, and other general-purpose equipment trains.
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
API Specification 5L, Line Pipe
API Standard 670, Machinery Protection Systems
API Standard 671, Special-purpose Couplings for Petroleum, Chemical, and Gas Industry Services
API Recommended Practice 686, Recommended Practice for Machinery Installation and Installation Design
API Recommended Practice 691, Risk-based Machinery Management
API Manual of Petroleum Measurement Standards (MPMS) Chapter 15, Guidelines for the Use of Petroleum Industry-specific International System (SI) Units
AGMA 925-A03 1, Effect of Lubrication on Gear Surface Distress
ANSI 2/API Standard 614, Lubrication, Shaft-sealing and Oil-control Systems and Auxiliaries, Fifth Edition, April 2008
ANSI/ABMA Standard 7 3, Shaft and Housing Fits for Metric Radial Ball and Roller Bearings (Except Tapered Roller Bearings) Conforming to Basic Boundary Plan
1 American Gear Manufacturers Association, 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia 22314, www.agma.org.
2 American National Standards Institute, 1899 L. Street, NW, 11th Floor, Washington, DC 20036, www.ansi.org.
3 American Bearing Manufacturers Association, 1001 N. Fairfax Street, Suite 500, Alexandria, Virginia 22314, www.americanbearings.org.