Novos documentos depositados
This job contains a bibliographic review of subjects as nucleation in the welding process, grain refinement and mechanical properties and grain refinement techniques in welding in order to endorse and justify the accomplishment of the experimental procedure. For the evaluation of the results obtained with this experimental procedure, there were one metallographic analysis, stress tests to break, and handmade folding until the break, where there have been changes in the weld bead p...
This work aims to characterize the HAZ coils Half-Pipes Jackets type in process equipment to the joints of the top type (vertical position) and fillet (horizontal and over head position). This need of characterization was due to the lack of detailed knowledge about failures observed in vessels with such a constructive arrangement, making remedial activities a sequence of actions with little theoretical basis to make the most efficient intervention. It was performed three specimens con...
The objective of this paper is to describe the main procedures in the execution of the maintenance of the flange sealing face lining of P-5202 heat exchanger located at Petrobras/Fafen-BA urea ground plan. The SA-105 medium-carbon steel forged flange internally lined with AISI 316-L stainless steel presented severe corrosion in the presence of ammonium carbamate in the sealing face. As substratum a SA-283 specification low-carbon steel sheet was used to simulate this type of coating...
The objective of this work is to present the main methods for quality control in welding joints of pyrolysis furnaces in a petrochemical industry. From required requisites, it describes the TIG welding process, the X-ray process stages, the causes and corrections of different types of defects in arc welding, and the several steps of the quality control process. It presents a study case that evaluates the quality of the welds through the results from the gammagraphy test. The study ...
This paper presents a new methodology for the dimensional recovery service and improvement of internal surface properties in entry jacket, a component of the FH hydraulic Packer. Usually the recovery of the entry jacket was carried out with thermal spray electric arc in almost 100% of its entire internal area, with the exception of the region which serves to protect the edges of the metallization, called anchorage. It also presents a solution to the seal failure, which results in th...
In contrast to almost all other equipment, machinery, vehicles, objects and commonly used materials, most of the pressure vessels are no industries manufacturing line items. The vessels are commonly custom designed and built to meet in each case a particular purpose or to certain performance conditions. As a result, the design is always done individually for each vessel to be built. The design of a pressure vessel includes not only its physical dimensions to withstand pressure and ...
Welding distortion has negative impact on fabrication accuracy, external appearance and production. In this study a wide collection of technique to minimize welding distortion throughout design, fabrication and post welding stages is presented. A numerical technique was also been performed to predict welding distortion. Welding induced strain in T-joint fillet weld of ASTM 36 steel using manual GMAW are numerically investigated. A previous work performed by the author was considered...
This monograph has the purpose to evaluate and verify the compliance of the safety management and fire prevention system during welding and cutting activities of one chemical company to the requirements of the National Fire Protection Association standards NFPA 51B – Standard for Fire Prevention During Welding, Cutting, and Other Hot Work, 2009 Edition. Practices, procedures, human and equipments factors were taken into account, by identifying the gaps to the standard requirement ...
The use of tubes of Polyethylene of High Density (HDPE) in Brazil, in spite of not being so recent, it has been developing on these last years, being considered a market now in expansion. The applications with systems of water and gas the low pressure is the one of larger use, maybe, due to the application engineers' little information on HDPE for more severe services, with detailed information on the limits of application of this material. This work aims at to do a comparison of th...
The permanence and persistence of corruption, in addition to misappropriating the patrimony of society, causes disservice in the essential demands of the population and reduces national and foreign investments due to political and judicial weaknesses. Understanding the dynamics of corruption in the public sector will facilitate the implementation of anti-corruption policies, obeying what advocates the law of fiscal responsibility. The study developed had the purpose of analyzing, ...