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Analysis of the Possibility of Using Dynamic Methods for Assessment of Investment Projects in the Domestic Foundry Industry

Szymszal J., Lis T., Gajdzik B., Kliś J.

Archives of Foundry Engineering

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2014

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Vol. 14, iss. 3

103--106

EN

A comparative analysis involving the evaluation of the effectiveness of investment projects can be based on various rules indicating selection of the most favorable decisions. The dynamic methods for assessment of investment projects discussed in this article, which consider the possibility of modifying the predetermined investment options, are quite complex and difficult to implement. They are used both in the construction phase of the new company, as well as in its subsequent modernization. The assessments should be characterized by a high coefficient of the economic efficiency. The, observed in practice, high dynamic variability of both the external and internal conditions under which the company operates is the reason why in the process of calculating the economic efficiency of investment projects, there is a significant number of random parameters affected by high uncertainty and risk. Investments in the metallurgical industry are characterized by a relatively long cycle of implementation and operation. These are capital-intensive projects and often mistakenly taken investment decisions end in failure of the investment project and, consequently, in the collapse of the company. In addition, the applied methods of risk assessment of investment projects, especially the dynamic ones, should be fully understood by managerial staff and constitute an easy to use, yet accurate tool for improving the efficiency of the company.

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Analiza stanu naprężeń w konstrukcjach odlewu korpusu, pokrywy i klina zasuw klinowych do gazu

Gwiżdż A., Żuczek R., Nowak M.

Prace Instytutu Odlewnictwa

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2012

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T. 52, z. 4

127-153

PL

Przeprowadzono analizę numeryczną rozkładu naprężeń eksploatacyjnych w zasuwach miękko uszczelnionych do sieci gazowych z rur PE odlewanych z żeliwa sferoidalnego EN-GJS-400-15. Analiza przeprowadzona została z wykorzystaniem systemu ANSYS, na podstawie danych i dokumentacji dotyczącej rzeczywistych warunków próby, przeprowadzanych w Fabryce Armatur JAFAR SA. Zastosowanie oprogramowania ANSYS pozwoliło na zintegrowanie analiz numerycznych opracowanej konstrukcji wirtualnej, obciążanej ciśnieniem próby, z reakcją rzeczywistej konstrukcji w trakcie prób laboratoryjnych prowadzonych na stanowisku do analizy szczelności, wraz z możliwością weryfikacji wyników wirtualnych i rzeczywistych. W niniejszej publikacji przedstawiono wyniki analizy dla zaworów DN50 i DN150. Wyniki tej analizy wykorzystane będą do weryfikacji konstrukcji odlewów wchodzących w skład modeli zasuw klinowych, poprzez poprawki wymiarowe konstrukcji.

EN

Numerical analysis was carried out to establish the operating stress distribution in soft-sealed gate valves cast from ductile iron EN-GJS-400-15 for the gas network of PE pipes. The analysis was carried out with ANSYS software, based on data and documentation of actual test conditions used at the JAFAR SA Fittings Factory. The use of ANSYS software allowed integration between the results of numerical analysis of the developed virtual structure loaded with test pressure and the response of real structure obtained during laboratory tests carried out on a stand for pressure leak testing, with further possibility of a verification of the results, both virtual and real. This publication presents the results of the analysis carried out on DN50 and DN150 gate valves. Through dimensional corrections introduced to the design, the results of this analysis will be used in verification of castings operating as components in models of the wedge gate valves.

3

Optimising stock management in foundries to keep the economic size of orders

Szymszal J., Binczyk F., Smoliński A., Kliś J.

Archives of Foundry Engineering

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2007

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Vol. 7, iss. 2

43-48

EN

Skillful stock management is one of the main conditions to raise the production output of an enterprise, foundry shop included. This article outlines modern methods of stock management using the generally available Excel calculation sheet to estimate the economic order quantity and minimum stock level required for selected auxiliary materials used in foundry production.