API St 547-2017 (2022) PDF

Full title and description

API Standard 547 — General‑Purpose Form‑wound Squirrel Cage Induction Motors — 185 kW (250 hp) through 2240 kW (3000 hp). This standard defines the mechanical, electrical and testing requirements, typical ratings and dimensional data sheets for large form‑wound squirrel‑cage induction motors used in industrial and petroleum‑industry applications.

Abstract

API Std 547 specifies requirements for design, construction, rating, nameplate data, tests and mechanical dimensions for general‑purpose form‑wound squirrel‑cage induction motors from 250 hp (185 kW) up to 3000 hp (2240 kW). It includes performance and routine/type test criteria, allowable temperature rise and vibration limits, and references data‑sheet formats used for procurement and inspection. The standard is intended to support consistent specification, manufacture and acceptance testing of large motors used in the oil & gas and heavy industrial sectors.

General information

• Status: Published, active (second edition).
• Publication date: Second edition, May 2017 (original API publication). A related datasheet package and some national/adopted versions are dated/issued in subsequent years (references show items listed as 2022 in some catalogs).
• Publisher: American Petroleum Institute (API).
• ICS / categories: Electrical machines and apparatus; rotating electrical machines; industrial motor standards (motors & drives).
• Edition / version: 2nd Edition (May 2017). Datasheet/worksheet supplements (API STD 547DATASHEETS) exist as companion documents.
• Number of pages: Standard document ~62 pages (second edition PDF record); datasheet workbook(s) are separate (typically 1–few pages or spreadsheet files).

Scope

Specifies minimum technical requirements for the design, manufacture, testing and documentation of general‑purpose form‑wound squirrel‑cage induction motors in the power range indicated (185 kW through 2240 kW). The scope covers electrical ratings and performance, mechanical dimensions and tolerances, permissible temperature rises, vibration limits, routine and type tests, nameplate/data‑sheet information and acceptable materials and construction practices appropriate for industrial and petroleum‑industry service. Companion datasheet/spreadsheet files provide standardized data‑sheet templates for procurement and inspection.

Key topics and requirements

• Defined rating bands and nameplate information for motors 250 hp (185 kW) and larger.
• Mechanical dimensions, mounting and shaft details to ensure interchangeability and fit with driven equipment.
• Performance and efficiency requirements, permissible temperature rise and insulation class guidance.
• Routine, type and performance test procedures and acceptance criteria (including vibration limits and no‑load/load tests).
• Data‑sheet formats and recommended information fields (available as companion datasheet/spreadsheet documents).
• Guidance on construction, materials and documentation required for procurement and inspection in oil & gas applications.

Typical use and users

Used by motor manufacturers (OEMs), specification writers, procurement teams, rotating‑equipment engineers, inspection and testing laboratories, and plant maintenance/operations personnel who specify, supply, install or accept large industrial induction motors — particularly in petroleum, petrochemical and heavy industrial facilities.

Related standards

Companion document: API STD 547DATASHEETS (datasheet/spreadsheet templates). Related international and industry standards commonly referenced when specifying large motors include IEC 60034 (rotating electrical machines), NEMA MG‑1 (motors and generators) and other API or industry standards covering motor controls, coupling and installation practices. Users should cross‑reference applicable national adoption or translation documents where present.

Keywords

API 547, form‑wound, squirrel‑cage, induction motor, large motors, 250 hp, 3000 hp, motor datasheet, performance tests, temperature rise, vibration limits, nameplate data, API standard.

FAQ

Q: What is this standard?

A: API Std 547 is an API technical standard that sets out requirements for general‑purpose form‑wound squirrel‑cage induction motors in the 185 kW (250 hp) to 2240 kW (3000 hp) range, including design, testing and documentation.

Q: What does it cover?

A: It covers electrical and mechanical requirements, performance and acceptance tests, allowable temperature and vibration limits, and standard data‑sheet fields used for procurement and inspection; companion datasheets are provided as spreadsheet templates.

Q: Who typically uses it?

A: Motor OEMs, rotating‑equipment engineers, procurement/specification teams, testing laboratories and plant maintenance/inspection personnel in oil & gas and heavy industrial sectors.

Q: Is it current or superseded?

A: The recognized edition is the 2nd Edition published in May 2017; users should check API notifications and national catalogs for errata, corrigenda or later notices and for any national adoptions or translations issued in later years (some catalog entries list related material dated 2022).

Q: Is it part of a series?

A: Yes — API issues motor and rotating‑equipment related standards and companion datasheet publications; API Std 547 is associated with its companion datasheet workbook (API STD 547DATASHEETS) and is typically referenced alongside other motor standards (IEC, NEMA) depending on regional practice.

Q: What are the key keywords?

A: Form‑wound, squirrel‑cage, induction motor, large motor, datasheet, performance tests, API 547, nameplate, vibration, temperature rise.