<abstract xmlns="http://www.w3.org/1999/xhtml">

The sealing gaskets are mechanical systems that seal and fill the gap between two or more jointed surfaces. The gasket have been created and designed to prevent leaks that can occur between surfaces subjected to compression and also, to prevent contamination with dust, mud or other impurities from outside of the system. The applicability area of these gaskets has increased visibly and they are currently used in a full range of equipment, such as mechanical transmissions, machines for terrain works, equipment production, etc. The way that seals help to fix and connect the mechanical assemblies, their stress resistance and their durability over the time have been studied by literature. The paper presents the influence of the components assembly in a high-pressure pump and its impact on sealing. Using the Taylor Hobson measurement system and scanning electron microscopy we were able to find out the composition of the gasket studied and determine the dimensional variations, mainly due to the assembly process.
</abstract>

Experimental Investigation on Assembly Process for High Pressure Injection Pump Components

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In this paper, a review is made of the knowledge about magnetorheological fluids which are part of the class of intelligent materials. These are the fluids that do not comply with Newton’s law, their energization being realized through an external magnetic field. Essentially, magnetorheological fluid is a synthetic solution based on hydrocarbons, populated with soft magnetic particles (easy to magnetize and demagnetize). Shock absorbers that use magnetic fluids are found in the automotive industry for vibration pick-up. The shock absorber with elastic element and magnetorheological fluid presents the following advantages: the possibility of electric control of the stroke and the speed of response of the piston-cylinder system, by a contactless method; it has a simple and reliable construction; the proposed shock absorber is a watertight construction; no internal sealing elements compatible with the magnetorheological fluid are required; the shock absorber does not have components with relative movement at the level of the control element, reducing frictional forces.
</abstract>

Aspects Concerning the Use of Magnetoreological Fluids in Construction of Shock Absorbers

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The wear is a very common physical phenomenon in the mechanical area. It can be observed in different mechanisms in different forms. Depending of the role of the mechanism in the assembly or subassembly of which it is part of, wear can happen. Thus, after a short analysis in the automotive area, it can be observed that in the fuel high pressure pumps, several forms of wear are encountered. Various levels of the wear can be studied. Depending of the working period and the operating conditions of the pump, various types of wear can occur, such as adhesion, corrosion, abrasion, fatigue or erosion. The purpose of this paper is to experimental study a type of wear often encountered in high pressure pumps, whose early identification can be useful in damages prevention in order to assure the pump performance. Some wear examples due to material fractures are described.
</abstract>

Fractures Analysis in High-Pressure Pumps

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The asynchronous electric motor is used in the electric stock industry. The inverter adjusts the speed of an asynchronous motor from level 0 to rated speed. An oil pumping plant comprises the bottom machine and the surface machine. The lower machine consists of the depth pump, gas and sand separator, extraction pipe, pump rods. The surface tool includes the pump unit and other equipment. In turn, the pumping unit consists of the rocker, mechanical gearbox, connecting rods, cranks and electric motor. In pump extraction processes, maximum engine speed and / or power is not required. Significant reductions in power consumption can be achieved by adjusting the engine speed with the help of a converter. This solution can reduce production costs and increase productivity by up to 50-60%. The paper is dedicated to studying the regulation of the asynchronous electric motor using a converter controlled by a Siemens PLC. The equipment used is didactic, being produced by the company ASTI Romania.
</abstract>

Operation of the Pumping System with Rods

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The structural continuity of the and the integrity of the metallic materials specific of pipelines guarantees their exploitation under proper technical conditions and with the minimum reduction of environmental risks, representing a permanent preoccupation and essential condition in the maintenance of the transport systems of fluid hydrocarbons through metallic pipes.
Metallic and non-metallic materials coming in contact with a certain environment suffer gradual degradation due to reciprocal interaction.
The nature of this interaction can be chemical or electrochemical and this, in time, makes the material unusable due to the structural, dimensional or continuity changes.
The resistance to corrosion of a metallic material is closely related to the composition and its structure, to its degree of purity, to the nature and characteristic of the corrosive environment, to the conditions in which the corrosion takes place.
When there is uniform corrosion, the behavior of the material is evaluated by the gravimetric index, the penetration index and the volumetric index.
The protection against corrosion represents the total measures taken to diminish the destructive action of the environment on materials in working concrete conditions, at the lowest possible cost and by meeting safety conditions.
The main means of protection or reduction of the corrosion intensity are the following: treatment of the environment (with the purpose of reducing its aggressivity), coating of the surfaces exposed to the corrosion, application of surface treatments, moving the electrochemical potential of the metal in the field of immunity or passaging and draining of dispersion currents.
The displacement of the potential of the metallic material protected in the field of immunity can be ensured by the realization of a galvanic pile with an active anode or by current injection, which opens, as an engineering practice, the way to ensuring the cathodic protection applied to the equipments in contact with an electrolyte (water, oil etc.), as the most modern method of preventing the loss of metallic material and of structural damage of the pipes destined for the transport of fluid hydrocarbons.
</abstract>

Problems in Insuring Maintenance of Transport Systems of Fluid Hydrocarbons Through Metal Pipes

AHEAD OF PRINT

Volume 69 (2023): Issue 3 (September 2023)

Volume 69 (2023): Issue 2 (June 2023)

Volume 69 (2023): Issue 1 (March 2023)

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Volume 68 (2022): Issue 3 (September 2022)

Volume 68 (2022): Issue 2 (June 2022)

Volume 68 (2022): Issue 1 (March 2022)

Volume 67 (2021): Issue 4 (December 2021)

Volume 67 (2021): Issue 3 (September 2021)

Volume 67 (2021): Issue 2 (June 2021)

Volume 67 (2021): Issue 1 (March 2021)

Bulletin of the Polytechnic Institute of Iași. Machine constructions Section

 Machine Construction section, as part of the Bulletin of the Polytechnic Institute of Iasi founded in 1946, appears as an autonomous publication since 1950. Currently, it is issued in both printed and electronic format, on a quarterly basis, and is included in a library exchange program with 84 other publications. The Machine Construction section is a technical scientific journal which publishes original research papers, as well as occasional reviews of treaties, lectures and monographs in various fields of Mechanical Engineering. Main topics include: theoretical and applied machine mechanics; fluid mechanics and hydro-pneumatic machines; robotics; tribology; machine manufacturing; machining technologies; industrial management; economical engineering in mechanics; machine design; mechatronics; theoretical and experimental study of strain and stress; micromechanical systems; materials machinability and surface finishing technologies; machine tools; automotive; internal combustion engines; steam and gas turbo-engines; refrigeration machines and heat pumps; renewable energy sources; heat transfer; cogeneration and tri-generation systems; applied thermodynamics and thermal systems; combustion; agricultural mechanics and machinery; technologies and equipment for food processing and food industry; bioengineering and biofuels; traffic and safety etc. At this time, there is no publication fee and full-text papers are available open-access on the university website. The review process of each submitted paper includes an anti-plagiarism test with specialized software and a double-blind independent review. The authors are notified at each stage of the process. The rejection rate is above 50%. The main publication language is English.  Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 