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1999 Edition, August 3, 1999

Complete Document

American National Standard Mechanical Vibration - Balance Quality Requirements of Rigid Rotors, Part 1: Determination of Possible Unbalance, Including Marine Applications

Includes all amendments and changes through Reaffirmation Notice , November 5, 2004

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Product Details:

  • Revision: 1999 Edition, August 3, 1999
  • Published Date: November 5, 2004
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: Acoustical Society of America (ASA)
  • Page Count: 32
  • ANSI Approved: Yes
  • DoD Adopted: No

Description / Abstract:

Scope and field of application

This part of S2.19 gives recommendations for determining unbalance and for specifying related quality requirements of rigid rotors. It specifies

(a) a representation of unbalance in one or two planes;

(b) methods for determining permissible residual unbalance;

(c) methods for allocating it to the correction planes;

(d) methods for identifying the residual unbalance state of a rotor by measurement;

(e) a summary of errors associated with the residual unbalance identification.

In table 1 and figure 2 recommendations are given, based on worldwide experience, concerning the balance quality requirements of rigid rotors, according to their type, mass, and maximum service speed.

This part of S2.19 is also intended to facilitate the relations between manufacturer and user of machines. Terminology specified in this part of S2.19 may be used for establishing technical specifications. [For definitions, see ANSI S2.7.]

Detailed consideration of errors associated with the determination of residual unbalance is not included in this standard. Nor does this standard define permissible residual unbalances for flexible rotors; these are covered in ANSI S2.43. The methods for balancing are not described.

The recommended balance quality grades are not intended to serve as acceptance specifications for any rotor group, but rather to give indications of how to avoid gross deficiencies as well as exaggerated or unattainable requirements; they may also serve as a basis for more involved investigations, for example, when a more exact determination of the required balance quality by measurement in the laboratory or in the field is necessary. If due regard is paid to the recommended limits, satisfactory running conditions can most probably be expected. However, there may be cases when deviations from these recommendations become necessary, e.g., because of unusual construction or geometry.