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RESEARCH PAPERS

Mathematical and Experimental Investigation Into the Auto-Frettaging of High-Pressure Mudpump Fluid Ends

[+] Author and Article Information
A. H. Van Der Krogt

Koninkijke/Shell, Exploratie en Produktie Laboratorium, Rijswijk, The Netherlands

J. Pressure Vessel Technol 100(1), 39-45 (Feb 01, 1978) (7 pages) doi:10.1115/1.3454432 History: Received June 22, 1977; Online October 25, 2010

Abstract

The fluid ends on high-pressure triplex mud pumps are exposed to high cyclic internal pressures. These fluid ends should therefore have adequate elastic strength and fatigue life under operating conditions. A method for increasing the fatigue life of the fluid ends is the auto-frettage process. The elastico-plastic behavior of fluid ends manufactured with side bores subjected to internal pressure has been studied both mathematically and experimentally. The mathematical analysis was carried out using an elasto-plastic finite-element approach. The experimental study, using direct strain-gage measurements, confirmed the mathematical analysis.

Copyright © 1978 by ASME
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