IEEE 841-2009 pdf download IEEE Standard for Petroleum and Chemical Industry—Premium- Efficiency, Severe-Duty, Totally Enclosed Fan-Cooled (TEFC) Squirrel Cage Induction Motors—Up to and Including 370 kW (500 hp)
1.2 Purpose
The purpose of this standard is to define a specification that deals with mechanical and electricalperformance, electrical insulation systems, corrosion protection, and electrical and mechanical testing forsevere-duty TEFC squirrel cage polyphase induction motors. up to and including 370 kW (500 hp), forpetroleum and chemical industry application. Many of the specified materials and components in thisstandard stem from experience with severely corrosive atmospheres and the necessity for safe, quiet.reliable,premium efficiency motors.
2.Normative references
This standard shall be used in conjunction with the following standards. When the following standards aresuperseded by an approved revision, the new revision shall apply.
ABMA 9-1990, Load Ratings and Fatigue Life for Ball Bearings.
ABMA 11-1999, Load Ratings and Fatigue Life for Roller Bearings.
ABMA 20-1996, Radial Bearings of Ball, Cylindrical Roller and Spherical Roller Types-Metric Design.API 610-2004, Centrifugal Pumps for General Refinery Services.2ASME Bl.1-2001, Unified Inch Screw Threads (UN and UNR Thread Form).
ASTM B117-97, Standard Practice for Operating Salt Spray (Fog) Apparatus.
5,6EEE Std 112-2004TM,IEEE Standard Test Procedure for Polyphase Induction Motors and Generators.
IEEE Std 117-1974TM (Reaff 1991), IEEE Standard Test Procedure for Evaluation of Systems of InsulatingMaterials for Random-Wound AC Electric Machinery.
IEEE Std 275-1992TM (Reaff 1998), IEEE Recommended Practice for Thermal Evaluation of InsulationSystems for Alternating-Current Electric Machinery Employing Form-Wound Preinsulated Stator Coils forMachines Rated 6900 V and Below
IEEE Std 522-2004TM,IEEE Guide for Testing Turn Insulation of Form-Wound Stator Coils forAlternating-Current Electric Machines.
NEMA MG 1-2006 Motors and Generators.
NFPA 70-2005, National Electrical Code ® (NEC ® ). 8
3. Service conditions
3.1 Usual service conditions
Unless otherwise specified, motors conforming to this standard shall be suitable for operation within their rating under the following service conditions:
a) Exposure to an ambient temperature in the range of –25 °C to +40 °C
b) Exposure to a maximum altitude of 1000 m above sea level
c) Indoor or outdoor severe-duty applications, such as humid, chemical (corrosive), or salty atmospheres
d) Full voltage across-the-line starting
e) Application in Class 1 Division 2 and Class 1 Zone 2 areas on sine wave power in accordance with the applicable codes and standards
3.2 Unusual service conditions
Unusual service conditions should be brought to the attention of those responsible for the design, manufacture, application, and operation of the motor. Such unusual conditions include the following:
a) Exposure to
1) Flammable or explosive gases
2) Combustible, explosive, abrasive, or conductive dust
3) Lint or dirty operating conditions where the accumulation of dirt will interfere with normal ventilation
4) Nuclear radiation
5) Abnormal shock, vibrations, or mechanical loading from external sources
6) Abnormal axial or side thrust imposed on the motor shaft
7) Altitude or ambient temperature outside the range covered in 3.1