API 684 :2005

1 OVERVIEW
  1.1 Introduction
  1.2 Organization
  1.3 Standard Paragraphs
  1.4 Definitions and References
  1.5 Fundamental Concepts Of Rotating Equipment Vibrations
2 LATERAL ROTORDYNAMICS
  2.1 Introduction
  2.2 Rotor Bearing System Modeling
  2.3 Rotor Modeling Methods and Considerations
  2.4 Support Stiffness Effects
  2.5 Journal Bearing Modeling
  2.6 Seal Types and Modeling
  2.7 Elements of a Standard Rotordynamics Analysis
  2.8 Machinery Specific Considerations
  2.9 API Testing and Results
  2.10 Standard Paragraph Sections for Lateral Analysis
3 STABILITY ANALYSIS
  3.1 Introduction
  3.2 Rotor Modeling
  3.3 Journal Bearings
  3.4 Seals
  3.5 Excitation Sources
  3.6 Support Stiffness Effects
  3.7 Experience Plots
  3.8 Machinery Specific Considerations
  3.9 Solving Stability Problems
  3.10 Indentifying Fluid Induced Instabilities
  3.11 Stability of Testing Machinery
  3.12 Standard Paragraph Sections for Stability Analysis
       SP6.8.5 - SP6.8.6
4 TORSIONAL ANALYSIS
  4.0 Introduction and Scope
  4.1 Modeling
  4.2 Machinery Specific Modeling Considerations
  4.3 Reciprocating Machinery
  4.4 Torsional Analysis Calculations
  4.5 Torsional Excitation Sources from Rotating Machinery
  4.6 Fatigue Analysis
  4.7 Contents of a Torsional Report
  4.8 Field Testing to Determine Torsional Response
  4.9 Torsional-Lateral Vibration Coupling
  4.10 API Document Paragraphs on Torsional Vibration
5 BALANCING OF MACHINERY
  5.1 Scope
  5.2 Introduction
  5.3 Balancing Machines
  5.4 Balancing Procedures

Defines, discusses, and clarifies the API Standard Paragraphs (SP) Section 6.8 which outlines the complete lateral and torsional rotordynamics and rotor balancing acceptance program designed by API to ensure equipment mechanical reliability.