Failure analysis and modernization of high-pressure hydraulic press for drilling tubes testing

•Multi-disciplinary research is conducted on a high-pressure hydraulic press.•Potentially weak elements and their failure modes are determined.•Analytical models of static and dynamic impacts are implemented.•Proposed design modifications provide the integrity of the existing structure.•Simultaneous...

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Bibliographic Details
Published in:Engineering failure analysis 2020-11, Vol.117, p.104772, Article 104772
Main Authors: Krot, Pavlo V., Zimroz, Radoslaw
Format: Article
Language:English
Subjects:
Hydraulic press
Penetration
Shock
Structural failure
Water jet
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Summary:•Multi-disciplinary research is conducted on a high-pressure hydraulic press.•Potentially weak elements and their failure modes are determined.•Analytical models of static and dynamic impacts are implemented.•Proposed design modifications provide the integrity of the existing structure.•Simultaneously, the required performance of tubes testing is provided. This research paper represents the results of abrupt failure investigation in the structure of industrial plant for hydrostatic pressure testing of tubes. The significant damages of testing machine elements are observed after the moving tube impact when the opposite tube end cap has been suddenly released because of the screw-thread defect. The water pressure inside the tube at the time of the incident was only 20 MPa while the maximal pressure of 125 MPa is required by tubes tests specification. Therefore, based on admitted assumptions, the detailed analysis is conducted of static and dynamic forces acting on elements of structure to avoid full machine destruction in case of the next incidents under higher pressures. Conditions are determined of the sharp cap end penetration into thrust plate and possible damage of upper protection casing from the water jet and tube pieces impacts under conditions of the crack opening in the tested tube. The two options are proposed of plant modernization to reinforce structure for safety work under pressure from 70 MPa to 125 MPa depending on tube size and testing conditions. The developed improvements of machine structure allow simultaneously increasing the productivity of testing plant up to 14–20 tubes per hour depending on their sizes.
ISSN:1350-6307
1873-1961
DOI:10.1016/j.engfailanal.2020.104772