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A comparative analysis methodology of calculation of strength tubesheets by european standards and guidelines for UDT

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Celarek A. , Talaga J.

This paper presents comparison of calculation methods of the required thickness of the tube sheet in the shell and tube heat exchanger compatible with the standards of the European standard PN - EN 13445-3, and the guidelines of the Polish Office of Technical Inspection (UDT). Details of the methods are illustrated by numerical examples – (calculations) for the selected design of the tubesheet.

An Evaluation of the Changes to the Mechanical Properties of Polymer Biocomposites Resulting from their Long-Term Storage at Low Temperatures

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Celarek A. , Kuciel S.

This paper presents an analysis of the properties of biocomposites that were stored for four years in the refrigerator at 6°C and were investigated for detailed information of mechanical properties like tensile strength and bending. The study was based on test results obtained in 2011. Comparison of changes in the structure of composite materials was carried out an analysis of SEM image. Matrix filling materials were made of wood fibres and tuff.