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Rotordynamic Analysis of Carbon Graphite Seals of a Steam Rotary Joint

  • H. Hirani
  • S. S. Goilkar
Conference paper
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 1011)

Abstract

In the present paper, a carbon graphite mechanical seal under low speed (< 1 m/s), low pressure (3 to 7 bar) and high temperature (\(120\mbox{ \textendash }17{0}^{\circ }\mathrm{C}\)) conditions has been analyzed. Paper manufacturing machines, where the process fluid steam transfers the heat to rotary drum for drying of paper-pulp, use a floating arrangement of such mechanical carbon graphite seals. A good design of floating ring seal permits relatively low clearance (to minimize leakage) without rubbing contacts, but in the absence of a reliable rotor dynamics tool, often floating rings are subject to excessive vibrations and subsequent brittle failure. To avoid unpredictable seal failures it is always essential to estimate reliable static and dynamic characteristics of floating seals. The present paper describes a numerical procedure for computing the static and dynamic characteristics of floating ring seals accounting for all radial and axial forces. The dynamic characteristics are predicted, based on the perturbation analysis and a finite-difference scheme. The analyzed results have been utilized to modify the geometric design of seal rings. Finally, comparative experimental studies performed on the modified and existing seals have been presented to validate the modified seal design.

Keywords

Steam rotary joint Paper industries Carbon graphite floating seal 

References

  1. 1.
    Lee, Y.B., Shin, S.K., Ryu, K., Kim, C.H.: Test results for leakage and rotordynamic coefficients of floating ring seals in a high-pressure, high-speed turbopump. Tribol. Trans. 48, 273–282 (2005)CrossRefGoogle Scholar
  2. 2.
    Yu, J.J., Goldman, P., Bently, D.E., Muzynska, A.: Rotor/seal experimental and analytical study on full annular rub. Trans. ASME, J. Eng. Gas Turb. Power 124, 340–350 (2002)CrossRefGoogle Scholar
  3. 3.
    Goilkar, S.S., Hirani, H.: Design and development of a test setup for online wear monitoring of mechanical face seals using a torque sensor. Tribol. Trans. 52, 47–58 (2009)CrossRefGoogle Scholar
  4. 4.
    Kanemori, Y., Iwatsubo, T.: Experimental study of dynamic fluid forces and moments for a long annular seal. Trans. ASME, J. Tribol. 114, 773–778 (1992)CrossRefGoogle Scholar
  5. 5.
    Ismail, M., Brown, R.D.: Identification of the dynamic characteristics of long annular seals using a time domain technique. Trans. ASME, J. Vib. Acoust. 120, 705–712 (1998)CrossRefGoogle Scholar
  6. 6.
    Ha, T.W., Lee, Y.B., Kim, C.H.: Leakage and rotordynamic analysis of a high pressure floating ring seal in turbo pump unit of a liquid rocket engine. Tribol. Int. 35, 153–161 (2002)CrossRefGoogle Scholar
  7. 7.
    Rao, T.V.V.L.N., Hirani, H., Athre, K., Biswas, S.: An analytical approach to evaluate dynamic coefficients and non-linear transient analysis of a hydrodynamic journal bearing. Tribol. Trans. 23(1), 109–115 (2000)CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIndian Institute of TechnologyNew DelhiIndia
  2. 2.Department of Mechanical EngineeringIndian Institute of TechnologyPowaiIndia

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