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research-article

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
hassan.warda@usa.net

Ihab Adam

Visitor Associate Professor, Department of Mechanical Engineering, Arab Academy for Science, Technology & Maritime Transport, Smart Village, Cairo, Egypt; Associate Professor, Department of Mechanical Engineering, Alexandria University, Alexandria 21544, Egypt
ihabadam@yahoo.com

Ahmad B. Rashad

Visitor Assistant Professor, Department of Mechanical Engineering, Arab Academy for Science, Technology & Maritime Transport, Smart Village, Cairo, Egypt; Assistant Professor, Department of Mechanical Engineering, Alexandria University, Alexandria 21544, Egypt
a_bahaa99@yahoo.com

Muhannad W. Gamal-Aldin

Lecturer Assistant, Department of Mechanical Engineering, Alexandria University, Alexandria 21544, Egypt
muhannad.wg@alexu.edu.eg

1Corresponding author.

ASME doi:10.1115/1.4039083 History: Received April 01, 2017; Revised November 06, 2017

Abstract

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 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 tangential outlet port; and of an internal clearance value complying with 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 varying rotational speed or fluid type. They can be also utilized to validate numerical simulations for geometrically similar designs.

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