Reciprocating Equipment Piston Rod Dynamic Elastic-Plastic Deformation Analysis

Analysis of reciprocating equipment piston rod leads to nonlinear elastic-plastic deformation analysis of rod with initial imperfection under axial dynamic load. In this paper a new and effective model and analytical formulations are presented to evaluate dynamic deformation and elastic-plastic stresses of reciprocating machine piston rod. This new method has capability to account for geometric nonlinearity, elastic-plastic deformation and dynamic effects. Proposed method can be used for evaluation of piston rod performance for various reciprocating machines under different operation situations. Rod load curves and maximum allowable rod load are calculated with presented method for a refinery type reciprocating compressor. Useful recommendations and guidelines for rod load, rod load reversal and rod drop monitoring are also addressed.

Authors:

• Amin Almasi

Keywords:

• Deformation
• Reciprocating Equipment
• Rod.

References:

[1] H. P. Bloch, Compressor and Modern Process Application, John Wiley
and Sons, 2006.
[2] H. P. Bloch, A Practical Guide To Compressor Technology, Second
Edition, John Wiley and Sons, 2006.
[3] H. P. Bloch and J. J. Hoefner, Reciprocating Compressors Operation &
Maintenance, Gulf Publishing Company, 1996.
[4] R. N. Brown, Compressors Selection and Sizing, Third Edition, Gulf
Publishing, 2005.
[5] R. S. Wilson, Reciprocating Compressor: Reliability Improvement
Focusing on Compressor Valves, Piston and Sealing Technology,
Compressor Optimization Conference, Aberdeen, 30-31 January, 2007.
[6] D. Hickman, Specifying Required Performance When Purchasing
Reciprocating Compressor - Part I & II & III, Compressor Tech Two,
August - September- October, 2007.
[7] S. M. Leonard, Increasing the Increase Reliability of Reciprocating
Hydrogen Compressors, Hydrocarbon Processing, pp. 67-74, January,
1996.
[8] S. M. Schultheis, C. A. Lickteig, R. Parchewsky, Reciprocating
Compressor Condition Monitoring, Proceeding of the Thirty Sixth
Turbomachinery, pp. 107-113, 2007.
[9] A. G. Fagundes, N. F. Fernandes, J. E. Caux, On-line Monitoring of
Reciprocating Compressors, NPRA Maintenance Conference, San
Antonio, May 25-28, 2004.
[10] L. E. Bishop, P-V Simulation A New Approach To Modeling
Reciprocating Compressor Performance, Journal of Petroleum
Technology, Page 881 - 888, May, 1985.
[11] H. Gajjar, Take It to Limit: The Dynamics of Rod Load and Rod
Reversal in Reciprocating Compressor, SPE 36265, SPE Mid-Continent
Gas Symposium, Amarillo, Texas, 1996.
[12] R. H. Grzebieta and N. W. Murray, The Static Behavior of Struts with
Initial Kinks at Their Centre Point, Int. J. Impact Eng., Vol. 4, No. 3, pp.
155-165, 1983.
[13] N. Jones and H. L. M. Dos Reis, On the Dynamic Buckling of a Simple
Elastic-Plastic Model, International Journal of Solid Structures, 16, pp.
969-989, 1980.
[14] W. A. Griffith, E. B. Flanagan, Online Continuous Monitoring of
Mechanical Condition and Performance For Critical Reciprocating
Compressors, Proceeding of the 30th Turbo-machinery Symposium,
Texas A&M University, Houston, TX, 2001.