ANALYSIS OF EFFICIENCY IN LIQUID SEAL WITH THE USE OF MECHANICAL SEAL

Transcription

1 Proceedings of the 5th International Conference on Integrity-Reliability-Failure, Porto/Portugal July 2016 Editors J.F. Silva Gomes and S.A. Meguid Publ. INEGI/FEUP (2016) PAPER REF: 6210 ANALYSIS OF EFFICIENCY IN LIQUID SEAL WITH THE USE OF MECHANICAL SEAL Eduardo Costa Estambasse 1(*), Flavio Antunes Ferreira 1, Marco Antônio dos Anjos 1, Paulo Bronieira Jr. 2, Willian R. B. M. Nunes 2, Evandro de Souza Leite 2, Cesar Renato Foschini 1 1 Department of Mechanical Engineering, Faculty of Engineering Bauru (FEB), Paulista State University, São Paulo, Brazil 2 Technology College SENAI, Londrina, Paraná, Brazil (*) eduardoestambasse@yahoo.com.br ABSTRACT Sealing systems plays an important role in the industry, the study of the components of these systems evaluates and predicts the life of equipment working under harsh regimes. This paper proposes the development of a bench where you can collect various types of data and results. Can be evaluated in this device the sealing system for mechanical seals and gaskets. An interchangeable flange of the replacement condition of parts of seal. The drive is done by an alternating current motor, which can be variable rotation proposal for data collection. It will be constructed a mathematical model in order to equalize product loss and component wear. Keywords: Seals, mechanical seals, gaskets. INTRODUCTION Faced with the constant needs of the companies, these open up the opportunity for situations improvements in its various segments, to improve, according to ( Efficient mechanical seals aid reliability, 2015) sealing systems must play solutions that meet this demand. Seals for mechanical seals, figure 1, are widely used in rotary systems and pumping in order to prevent leaks, provide an ideal condition for working with fluids or gases, this system prevents them from being released to the environment contaminant possible environment and the economy with waste leaks that occur in other processes. Fig. 1- Conventional mechanical seal -685-

2 Topic_M: Industrial Engineering and Management To (NYEMECK; LEDAUPHIN, 2015) mechanical seals can behave in different ways when subjected to shocks temperatures and other intemperes according to (LAMBERT, 1996). The types of seals can be divided in two ways: a) Static; (together) b) Dynamics; (mazes, worm drives, and with contact, which can be radial or axial seals and gaskets being and mechanical seals). Mechanical seal Component responsible for sealing pressurized fluids in reservoirs that may be static or rotating, which have axes which your body. It consists of rotating elements that are fixed to the shaft, and the static part fixed to the call box housing has sealing faces that are constructed of ceramic, tungsten, silicon, graphite etc. these are considered as main elements, the other o-rings, wedges, spring, Teflon can be considered as secondary elements. Basically the seals are composed of the following components can be seen in Figure 2: sided ring; Counter face ring; Seals; Spring; drag ring; Fig. 2- Mechanical seal in cut Regarding the forms of assembly of mechanical seals are divided into two main groups; a) Set rotary compensation based stationary; b) compensation set stationary and rotating seat. The seals may still exhibit several advantages relative to the use of gaskets to seal systems; a) has higher mean time between failure is deemed to other sealing systems. b) Reduces the implementation cost by eliminating waste products and maintenance. c) Does not require maintenance. d) Trust in security when it retains dangerous products

3 Proceedings of the 5th International Conference on Integrity-Reliability-Failure Gaskets The gaskets are important parts of the pumps due to its construction and assembly process can provide disadvantages hinder the satisfactory operation of the system. It is also component that is intended to prevent leakage of fluid into the middle, but the gaskets need leakage for your own lubrication, they can still damage the sacrifice glove, causing increased consumption due to grips as (EDSON EZEQUIEL DE MATTOS, 1998). Sealing by gaskets systems require constant maintenance, and monitoring of leaks grips, which in turn may cause damage to the equipment due to the exhaust products, these can be corrosive and hazardous. Gaskets are made of the following materials; Cotton; Jute; Nylon; Teflon; Eraser; Aluminum; brass and copper; Carbon; After the manufacture of the packing, they are impregnated with materials such as tallow, graphite, oil, silica and mica in order to make them self lubricated. Can be constructed in four different they are; Gasket type String Table 1 - Different types of gaskets Lip gasket Gaskets Compression Chevron gasket -687-

4 Topic_M: Industrial Engineering and Management It is essential to the leaky gaskets systems, according to need, or if an excessive heating must be carried with increased leakage of fluid for the purpose of lubricating and cooling assembly, this causes minimizes shaft wear, as a contra entry increases the product waste to be sealed. METHODOLOGY This work is an experimental research with the development of a project and the construction of a device for packing and mechanical seals tests. In principle for the construction of testing equipment will be an analysis of the main types of sealing systems used in industry, the device for data collection aims to replicate exactly industrial equipment. The making of the project will be made using the SolidWorks graphics software for the construction of equipment drawings. Thus it is possible to detail all the stages of project construction and positioning simulation of components, you can still check for possible failures. The designed equipment is capable of monitoring leaks, the two types of seals, gaskets and mechanical seal, you can answer the requests as leaks under pressure, or contamination by vacuum leak. Another factor that may be considered in sealing systems using this device is the temperature condition of the components. It will be possible to attach other devices to that equipment, such as a PLC (Programmable Logic Controller) that can be used to change the axle rotation speed. A literature search of sealing systems for rotating machinery analysing the various existing forms, features and characteristics of each type of equipment and sealing systems base the proposed study. Figure 3 illustrates the mounting of equipment designed in SolidWorks, the machine has a cap and may have fluid under pressure can also experience sealing systems with the use of vacuum. Fig 3-3D drawing assembly of the test device The machine is equipped with an AC motor with 1 hp of power, being driven by a circuit breaker. An elastic claw coupling makes connection to the motor shaft drawn steel SAE 1045 in the dimensions of 3/4 "diameter by 800mm in length. The shaft is supported by two bearings type P 204 with

5 Proceedings of the 5th International Conference on Integrity-Reliability-Failure The reservoir housing will be constructed of sheet 1/4 "steel SAE 102 may be airtight with pressure and vacuum experiments through holes in their ends of 22mm for passage of the simulation axis. On the side flange is coupled which simulates the housing gaskets or mechanical seals can be replaced according to the needs of the experiment. The flanges are fixed by screws and have a oring ring seal. In this device will be mounted to leakage analysis configuration in mechanical seals, in this case we will use two seals on each side of the box according to figure 4. Fig. 4 - Leak check device in stamp - Court. To analyze the leak adopt that failure can occur in two ways; 1) leak fluid that causes change in the processes to which the system aims to seal. 2) Environmental contamination from the spill. Before the two forms presented failures, we adopt the second as a criterion to analyze the experiment. It can perform the calculation of the mechanical seal leakage proposed by (QUIXADÁ, 2014) as follows: (1) Q = Leak rm = average radius of the faces re = outer radius of the faces ri = Inside radius of faces h = Thickness of the film formed between the faces Dp = Pressure difference in interface µ = liquid viscosity The most important factor in this case becomes the thickness formed by the fluid film, which is the space between seal faces, taking into account that a small variation in the value according to (HARUYAMA et al., 2013) causes large change in the calculated leak. PARTIAL RESULTS AND DISCUSSION Within the methodological procedures adopted for this research, the following steps were followed for the development and collection of data; 1) Analyse the bibliographic data necessary for the development of the prototype for the experiment. 2) Definition of the components that will be used to assemble the data collection system

6 Topic_M: Industrial Engineering and Management 3) Mounting Strategy sealing system used for monitoring and data collection. 4) Verification of the data, tabulation of the values and application of mathematical models. 5) Presentation of the results. Using the review of bibliographic data has been defined a model to be built that can give data collection conditions of the samples being analysed. According to the theme of work, the results of the proposed study will present the real situation of the components in scope, these data can be used in mathematical models and simulations of finite elements. To (ZHANG et al., 2006), thereby improving the design of the sealing assemblies. They can also be used in order to clarify the maintenance of seal kits, also contribute to minimizing contamination risks to the environment and people. PRELIMINARY CONCLUSIONS This study aims to investigate the amount of fluid lost through different types of sealing leaks through tests. The following conclusions can be verified in this study; The design, manufacture and assembly of a simulation equipment for use in sealing systems. Product waste of calculation Application of the equipment in operation. Make a real comparison of fluid leakage in the equipment to the outside. The device may be configured in various ways to suit various types of sealing systems. ACKNOWLEDGMENTS I thank the School of SENAI Technology Londrina for supporting us technically and financially. Also extend its thanks to the INTERSEALS Company that provided the material for study and assembling the prototype. REFERENCES [1]-Edson Ezequiel de Mattos, R.F. Bombas Industriais. 2. ed. Rio de Janeiro: Interciencia, [2]-Efficient mechanical seals aid reliability. World Pumps, v. 2015, n. 5, p , maio [3]-Haruyama, S. et al. Influence of surface roughness on leakage of new metal gasket. International Journal of Pressure Vessels and Piping, v , p , nov [4]-Lambert, P. The development of a new generation of split mechanical seals. Sealing Technology, v. 1996, n. 32, p. 7, ago [5]-Nyemeck, A.P.; Ledauphin, T. Experimental analysis of mechanical seals operating under thermal shock. Sealing Technology, v. 2015, n. 2, p. 8 12, fev [6]-Quixadá, R.F. Estudo de selo mecânico para turbinas hidrocinéticas. Trabalho de Conclusão de Curso - Graduação - Bacharelado. Disponível em: < Acesso em: 8 jul [7]-Zhang, J. et al. A numerical simulation of 3-D inner flow in Up-stream Pumping Mechanical Seal*. Journal of Hydrodynamics, Ser. B, v. 18, n. 5, p , out