The Hydraulic Institute (HI) recently announced the publication of a new document, ANSI/HI 9.6.8 Dynamics of Pumping Machinery, that addresses the need for guidance on dynamic analysis of different pump applications. Developed through a large cooperative committee of HI pump manufacturer members, HI Standards Partners and HI Associate Members, almost all HI rotodynamic pump member companies were represented at various times during the 10-year period required to produce this new document. The Dynamics of Pumping Machinery document was initiated in 2005 during a revision of the 2000 edition of HI's normative vibration standard, ANSI/HI 9.6.4-2000 (since superseded by ANSI/HI 9.6.4-2009), when the committee recognized that guidance information pertaining to dynamic analysis contained in that standard was best addressed in a separate guideline document. The concept was to create a document that provided guidance to the pump industry regarding recommended best practices for dynamic analysis of pumps and pumping equipment across the immense scope of pump types and applications addressed by HI Standards (see Figures 9.6.8.1.2a, 9.6.8.1.2b and 9.6.8.1.2c).
![Figure 9.6.8.1.2a. Rotodynamic pump types - overhung (Graphics courtesy of Hydraulic Institute)](/sites/default/files/0615/HIreport-Image_1.jpg)
![Figure 9.6.8.1.2b. Between-bearings pump types and classifications](/sites/default/files/0615/HIreport-Image_2.jpg)
- Rotor lateral
- Rotor torsional
- Structural, including Reed frequency analysis
- Level 1 - Simple calculations performed using standard or derived equations
- Level 2 - Intermediate methods that involve basic mass elastic modeling using commercially available software tools such as finite element analysis
- Level 3 - Advanced methods involving multiple specialty programs and complex methodologies, typically undertaken by specialists
- Decision matrix and uncertainty values table to help quantify risk and uncertainty
- Market influences considerations
- Market trends considerations
- Cost and lead time considerations
![Figure 9.6.8.1.2c. Rotodynamic pump types — vertically suspended](/sites/default/files/0615/HIreport-Image_3.jpg)