API STD 541-2014 (R2021)

$53.30

Form-wound Squirrel Cage Induction Motors-375 kW (500 Horsepower) and Larger

Published By	Publication Date	Number of Pages
API	2014	168

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Description

1.1 Scope

1.1.1 This standard covers the minimum requirements for special purpose form-wound squirrel cage induction motors 375 kW (500 hp) and larger for use in petroleum, chemical, and other industry applications. This standard can also be used for induction generators by substituting “generator” for “motor” where applicable. Notes following a paragraph in Sections 1 through 8 are informational only and are not enforceable as part of this standard.

NOTE A special purpose machine typically has one or more of the following characteristics:

is in an application for which the equipment is designed for uninterrupted, continuous operation in critical service, and for which there is usually no installed spare equipment;
is larger than 2250 kW (3000 hp) for speeds 1800 rpm and below;
is rated 600 kW (800 hp) or greater for two pole (3000 rpm or 3600 rpm) machines of totally enclosed construction, or rated 930 kW (1250 hp) or greater for two pole machines of open or guarded construction (including machines with WP-I or WP-II type enclosures);
drives a high-inertia load (in excess of the load Wk2 listed in NEMA MG 1, Part 20);
uses an adjustable speed drive (ASD) as a source of power;
is an induction generator;
is a vertical machine rated 375 kW (500 hp) or greater; or
operates in abnormally hostile environments.

A round bullet (?) at the beginning of a paragraph indicates that either a decision is required or further information is to be provided by the purchaser. This information shall be indicated on the datasheets (see Annex A); otherwise, it shall be stated in the quotation request or in the order.

A diamond bullet (?) at the start of a paragraph indicates additional requirements for motors applied with ASDs. 1.1.2 This standard requires the purchaser to specify details and features. The purchaser shall complete the datasheets in Annex A.

NOTE Guidance for completion of the datasheets is provided in Annex C.

1.2 Alternative Designs

The vendor may offer alternative designs (see 8.1.9).

1.3 Dimensions and Standards

1.3.1 Both the metric (SI) and U.S. customary (USC) system of units and dimensions are used in this standard.

Data, drawings, and hardware (including fasteners) related to equipment supplied to this standard shall use the ?

2 API STANDARD 541

system of units specified by the purchaser. An alternate system of units for hardware (including fasteners and flanges) may be substituted if mutually agreed upon by the purchaser and the vendor.

1.3.2 This document recognizes two different systems of standards for the manufacturing and testing of electrical machines: the North American ANSI, IEEE, and NEMA standards and the international IEC and ISO standards. The North American standards are the base documents. When specified by the purchaser, the corresponding international standards are acceptable for use as alternatives; however, this shall not be construed that they are identical to the North American standards.

NOTE The purchaser should be aware that specific requirements contained within corresponding standards may differ.

1.4 Conflicting Requirements

In case of conflict between the inquiry, order and datasheets, this document, and any referenced standards, the order of precedence shall be: