API St 677-2021 Datasheets PDF

Full title and description

St API St 677-2021 Datasheets — datasheet companion for API STD 677:2021, "General-purpose, Extruder, and Epicyclic Gear Units for Petroleum, Chemical, and Gas Industry Services." The datasheets package provides tabulated selection, dimensional, performance and ordering data (spreadsheet/excel format) intended to accompany the full API STD 677 technical standard.

Abstract

These datasheets summarize the key numeric and tabular information from API STD 677 (4th Edition, 2021) for quick selection and specification of general-purpose, extruder and epicyclic gear units used in petroleum, chemical and gas industry services. Typical contents include gear ratios, nominal torques, bearing and shaft dimensions, lubrication notes, speed and pitch-line velocity limits, tolerances and recommended inspection/test points.

General information

• Status: Current.
• Publication date: September 2021 (4th edition; published September 2021 — edition dated 2021-09/September 1–13, 2021 in distributor records).
• Publisher: American Petroleum Institute (API).
• ICS / categories: Petroleum, chemical and gas industry services; mechanical engineering — gears and gear units.
• Edition / version: 4th edition (2021).
• Number of pages: Full standard: 188 pages (standard); datasheet package: published as a separate datasheet set (Excel/tabular files) accompanying the standard.

Scope

Provides minimum requirements and specification data for general-purpose, enclosed single- and multistage gear units incorporating parallel-shaft spur and helical gears, extruder gears (slow-speed applications), and selected epicyclic gear units for electrical generators, centrifugal compressors and pumps in petroleum, chemical and gas industry services. The standard (and its datasheets) note limits such as maximum pitch-line velocity (commonly limited to 60 m/s for general-purpose/extruder gears) and excludes special-purpose or integral-gear arrangements covered by other API standards.

Key topics and requirements

• Types covered: general-purpose parallel-shaft gears, extruder (slow-speed) gears, and selected epicyclic gear units.
• Design/performance limits: rated torques, speeds, allowable pitch-line velocity (≈60 m/s limit for general-purpose/extruder gears), service factors and load considerations.
• Dimensional data: shaft and bearing dimensions, mounting interfaces, and envelope sizes presented in tabular form for selection.
• Materials and heat treatment guidance for gear sets, shafts and housings.
• Lubrication, sealing and auxiliary systems guidance (lubricant type, filtration, breathers, sump capacity ranges).
• Tolerances, inspection and acceptance testing: runout, tooth contact, vibration and factory testing requirements.
• Referenced standards and normative documents for detailed tolerancing, measurement and test methods.

Typical use and users

Datasheets are used by rotating-equipment engineers, OEMs, maintenance and reliability teams, procurement/specification engineers, and technical sales. They provide rapid lookup for selection, basic ordering data and installation checks when specifying or replacing gear units in petrochemical, oil & gas and related industrial plants.

Related standards

Closely related API gear standards and referenced documents include API STD 613 (special-purpose gears), API STD 672 (integrally geared compressors), API STD 617 and multiple AGMA/ISO test and tolerance documents cited by API STD 677; the full standard lists several AGMA and ISO references for detailed procedures and tolerances. The separate datasheet product is published as an add-on/tabular package to the API STD 677 technical text.

Keywords

API 677, gear units, extruder gears, epicyclic gears, parallel-shaft gears, datasheets, gear selection, petroleum industry, chemical industry, speed reducers, torque tables, pitch-line velocity.

FAQ

Q: What is this standard?

A: API STD 677 (4th edition, 2021) is an API technical standard that sets minimum requirements for the design, testing and specification of general-purpose, extruder and selected epicyclic gear units used in petroleum, chemical and gas industry services. The "datasheets" product packages tabular/excel selection and dimensional data that accompany the full standard.

Q: What does it cover?

A: It covers general-purpose enclosed single- and multistage gear units (spur and helical), extruder-specific requirements (slow-speed/high-torque applications) and certain epicyclic gear applications, with limits such as maximum pitch-line velocity and exclusions for special-purpose or integrally geared equipment (covered by other API standards). The datasheets present the numeric tables and selection data extracted or summarized from the full text.

Q: Who typically uses it?

A: Rotating‑equipment designers and engineers, OEMs that manufacture/rebuild gearboxes, maintenance and reliability teams, procurement and spec writers in oil, gas and chemical plants, and consultants who need repeatable selection and inspection criteria.

Q: Is it current or superseded?

A: The 2021 (4th) edition is listed as the current edition; it supersedes the earlier API 677:2006 (R2016) edition. For confirmation of currency consult API or authorized distributors.

Q: Is it part of a series?

A: Yes — API publishes a family of gear and rotating-equipment standards (API 613, API 617, API 672, etc.). API STD 677 is the API document addressing general-purpose/extruder and some epicyclic gear units; a separate "datasheet" product (spreadsheet/Excel) is published to aid specification and selection.

Q: What are the key keywords?

A: API 677, datasheets, gear units, extruder, epicyclic, parallel-shaft, pitch-line velocity, torque, speeds, petroleum/chemical/gas industry.