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Research Papers: Gas Turbines: Structures and Dynamics

Integral Pumping Devices for Dual Mechanical Seals: Hydraulic Performance Generalization Using Dimensional Analysis

[+] Author and Article Information
Hassan A. Warda

Professor
Department of Mechanical Engineering,
Alexandria University,
Alexandria 21544, Egypt
e-mail: hassan.warda@usa.net

Ihab G. Adam

Department of Mechanical Engineering,
Arab Academy for Science, Technology &
Maritime Transport,
Smart Village,
Cairo 12577, Egypt;
Department of Mechanical Engineering,
Alexandria University,
Alexandria 21544, Egypt
e-mail: ihabadam@yahoo.com

Ahmed B. Rashad

Department of Mechanical Engineering,
Arab Academy for Science, Technology &
Maritime Transport,
Smart Village,
Cairo 12577, Egypt;
Department of Mechanical Engineering,
Alexandria University,
Alexandria 21544, Egypt
e-mail: a_bahaa99@yahoo.com

Muhannad W. Gamal-Aldin

Department of Mechanical Engineering,
Alexandria University,
Alexandria 21544, Egypt
e-mail: muhannad.wg@alexu.edu.eg

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received April 1, 2017; final manuscript received November 6, 2017; published online May 15, 2018. Assoc. Editor: Jerzy T. Sawicki.

J. Eng. Gas Turbines Power 140(8), 082507 (May 15, 2018) (9 pages) Paper No: GTP-17-1124; doi: 10.1115/1.4039083 History: Received April 01, 2017; Revised November 06, 2017

An experimental study is carried out investigating hydraulic performance for various designs of dual-mechanical-seal cartridges with integral pumping-rings. The tested devices are classified into two main families: radial-flow and axial-flow. The radial-flow family utilizes the modified-paddle-wheel (MPW) pumping ring with either a radial or a tangential oriented cartridge outlet port, while the axial-flow family utilizes the pumping scroll (PS) pumping ring in the following cartridge-geometries: single-pumping-scroll (SS) and double-pumping-scroll (DS); as both types can be of either a radial or a tangential outlet port; and of an internal clearance value complying with American Petroleum Institute (API) 682 standard or smaller clearance. An experimental setup is constructed, and appropriate instrumentation is employed to measure inlet pressure, outlet pressure, rotational speed, and barrier fluid flow rate acquiring flow-head characteristic curves. Moreover, empirical generalized characteristic curves are deduced from experimental observations obtained from the present study and previous companion work. The generalized curves can be employed in estimating pumping ring performance for a different size or other operation conditions such as varying rotational speed or fluid type. They can be also utilized to validate numerical simulations for geometrically similar designs.

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References

Blaber, J. A. , 2003, “ Training Module TM-070,” John Crane EAA Training and Development Group, Manchester, UK.
API, 2012, “ Pumps-Shaft Sealing Centrifugal and Rotary Pumps,” 4th ed., API Publishing Services, Washington, DC, API Standard No. 682.
Smith, R. J. , 2010, “ Pressurized Dual Mechanical Seals Supporting Piping Plan Developments,” 26th International Pump Users Symposium, Houston, TX, Mar. 15–18, pp. 57–65. http://oaktrust.library.tamu.edu/handle/1969.1/162627
Carmody, C. , Roddis, A. , Amaral, T. , and Schurch, D. , 2007, “ Integral Pumping Devices That Improve Mechanical Seal Longevity,” 19th International Conference on Fluid Sealing, Poitiers, France, Sept. 25–26, pp. 235–247.
Luan, Z. , and Khonsari, M. , 2006, “ Numerical Simulations of the Flow Field Around the Rings of Mechanical Seals,” ASME J. Tribol., 128(3), pp. 559–565. [CrossRef]
Luan, Z. , and Khonsari, M. , 2007, “ Computational Fluid Dynamics Analysis of Turbulent Flow Within a Mechanical Seal Chamber,” ASME J. Tribol., 129(1), pp. 120–128. [CrossRef]
Warda, H. , Wahba, E. M. , and Selim, E. A. , 2015, “ Integral Pumping Devices for Dual Mechanical Seals: Experiments and Numerical Simulations,” ASME J. Eng. Gas Turbines Power, 137(2), p. 022504. [CrossRef]
Warda, H. , Adam, I. , Rashad, A. , and Aldin, M. G. , 2016, “ Effect of Kinematic Viscosity of Barrier Fluids on the Performance of a Bi-Directional Integrated Pumping Ring for Dual Mechanical Seals,” ASME Paper No. FEDSM2016-7763.
John Crane, 2015, “ TYPE 1648/2648/3648,” John Crane Group, Chicago, IL, accessed Feb. 13, 2018, https://www.johncrane.com/~/media/J/Johncrane_com/Files/Products/Technical%20Specification/Seals/TD-1648-2648-3648-8pg-BW-OCT2015.pdf
Zlokarnik, M. , 2002, Scale-Up in Chemical Engineering, Wiley, Hoboken, NJ. [CrossRef]
Gülich, J. F. , 2010, Centrifugal Pumps, 2nd ed., Springer, Berlin. [CrossRef]
Dixon, S. L. , 1998, Fluid Mechanics, Thermodynamics of Turbomachinery, 4th ed., Butterworth-Heinemann, Oxford, UK.
Timar, P. , 2005, “ Dimensionless Characteristics of Centrifugal Pump,” Chem. Papers-Slovak Acad. Sci., 59(6B), p. 500. http://chempap.org/?id=7&paper=11
Coleman, H. W. , and Steele, W. G. , 2009, Experimentation, Validation, and Uncertainty Analysis for Engineers, Wiley, Hoboken, NJ. [CrossRef]

Figures

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Fig. 1

Illustration of barrier fluid circulation by the use of a pumping ring integrated on pump's shaft

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Fig. 2

Schematic diagram for the process-fluid loop (a) and the barrier-fluid loop (b) [7]

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Fig. 3

Geometry of the tested bidirectional MPW dual seal cartridge [9]

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Fig. 4

Photographs for the experimental setup showing the: MPW-pumping-ring (a), PS-pumping-ring (b), dual-seal cartridge (c), dismantled dual-seal cartridge (d), and seal cartridge being mounted on the pump's shaft (e)

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Fig. 5

Effect of shaft rotational speed on QP characteristic curve for the MPW dual-seal cartridges for water as barrier fluid

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Fig. 6

Effect of shaft rotational speed on QP characteristic curve for the single-scroll dual-seal cartridges for water as barrier fluid

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Fig. 7

Effect of shaft rotational speed on QP characteristic curve for the double-scroll dual-seal cartridges for water as barrier fluid

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Fig. 8

Dimensionless characteristic curve π2−π1 plotted at different rotational speeds for the MPW dual-seal cartridges for water as barrier fluid

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Fig. 9

Dimensionless characteristic curve π2−π1 plotted at different rotational speeds for the single-scroll dual-seal cartridges for water as barrier fluid

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Fig. 10

Dimensionless characteristic curve π2−π1 plotted at different rotational speeds for the double-scroll dual-seal cartridges for water as barrier fluid

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Fig. 11

Dimensionless characteristic curve π2−π1 plotted for various types of barrier fluid for the MPW dual-seal cartridges at the same rotational speed

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Fig. 12

Dimensionless characteristic curves π2−π1 for all tested dual-seal cartridges for water as barrier fluid

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