IEEE 841 SQUIRREL CAGE INDUCTION MOTOR

[bobziva]

IEEE 841 is Standard for Chemical and Petriochemical Industry.My customer wants to see 3/4 HP motor designed to meet IEEE 841 Standard. One comment sent to me is that 3/4 HP motors are not provided for that standard. Who can tell me is it true or not ? / I do not have here standard /
Sincerely,
bobziva@yahoo.com

 

[mbailey]

The IEEE 841 standard applies to high-efficiency totally enclosed fan-cooled, horizontal and vertical, single speed, squirrel cage polyphase induction motors, up to 370kW (500hp) in the NEMA frame sizes 143T and larger for petroleum, chemical and other severe duty applications. Excluded are sleeve bearings and specific feature required for explosion proof motors.

Almost a direct quote from the scope in IEEE841-2001.

 

[Farkel]

Yes, Spec only is for intergal motors, not fractional. However, Tatung makes as close as you will find in a severe duty all cast iron motor for chemical duty that would be considered as close as you will get in a fractional.

 

[jOmega]

Farkel:

Impro seals DE & NDE both.... in that Tatung motor ?

 

[Farkel]

No seals, but the intent of other ingredients are there.

 

[bobziva]

If Standard IEEE841-2001 is only for intergal motors, not fractional, which IEEE Standard is provided for small fractional motors ? ( If any )

 

[jOmega]

Thanks, Farkel.
Without the seals, application in severe duty environments is limited.

Have added info to database.

jO

 

[Farkel]

Should rephrase my statement, the motors have no inpro seals, but has shaft slinger, and construction to prevent contamination of bearings. Also, Tatung has it's own wire mill, and manufacturer for their IEEE841 motors a wire with 4800VAC peak to peak BIL. Sorry to say IEEE does not have a spec concerning fractional motors.

 

[jbartos]

Suggestion: Check with some manufacturers if they follow any standards, e.g.

http://www.ryanherco.com/Download/Stenner02.pdf

Another approach is to have a 3/4HP motor qualified by a Nationally Recognized Testing Laboratory (NRTL) for the chemical and petrochemical industry applications.

 

[jOmega]

JB,

While having the motor tested and qualified by an independent agency might seem like a good idea,
it is VERY expensive.... and......

Additional: after you have read IEEE std 841 ... you will understand that the qualities defined therein, cannot be inspected into a motor; they have to be designed and built into it.... ergo.... third party qualification would not work in this instance. The motor either meets IEEE 841 or it doesn't.... If it does, then there'd be no need for a third party agency to qualify it. If it doesn't.. then a third party agency will not be able to qualify it to IEEE 841 compliance.

It's not quite the same as having a product that lacks a U.L. label tested at ETL labs and certified therefrom.

Your suggestion works only if the customer is willing to accept that while it doesn't necessarily comply with all of IEEE 841.... the NRTL qualification would be acceptable.

Worth a try....but get out the checkbook.

 

[jbartos]

Suggestion: It depends on applications. In some instances, the product has to be certified in a relatively costly way, e.g. the Nuclear Power Generating Station Class 1E equipment; if one type is discontinued and the substitute is not Class 1E equipment certified.