Tubesheets in fixed and floating head heat exchangers. A heat exchanger is a device that is used to transfer thermal energy enthalpy. Floating head heat exchanger maintenance free download as powerpoint presentation. A heat transfer device used to exchange heat between two liquid streams that are single phase fluids. The optimum thermal design of a shell and tube heat exchanger involves the consideration of many. Based of the exchanger configuration obtain the temperature correction factor. The floating tubes sheet is clamped between the floating head and a clamp ring. These heat transfer devices are engineered to meet to a wide variety of applications. Thus, this exchanger is a modified floatinghead shellandtube exchanger. Because of the number of variations in mechanical designs for front and rear heads and shells, and for commercial reasons, tema has designated a system of notations that correspond to each major type of front head, shell type and rear head.
Shell and tube exchangers an overview sciencedirect topics. Pdhonline course m371 2 pdh shell and tube heat exchangers. Reason for heat exchangers a heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another hot and cold fluid. Temperature control of shell and tube heat exchanger by using. Types of heat exchangers used on ship marine insight. The types of exchangers are mainly defined by their construction and are as follows. There are 161 suppliers who sells floating head heat exchanger on, mainly located in asia.
The shell is equipped with two nozzles for entry and exit of shell side fluid. Floating head exchangers are used when the media being handled causes fairly rapid fouling and the. Dec 16, 20 most process shellandtube heat exchangers are manufactured to tubular exchanger manufacturers association tema standards. A dimensionless coefficient representing the magnitude of thermal performance.
Heat transfer heat exchanger types of heat exchangers. Fluid engine oil sea water inlet temperature, c 65 20 outlet temperature, c 55 25 heat load, kw 117. For 1 shell2 tube pass exchanger for other configurations use the following charts temperature correction factor. The study of failure analysis of shell and tube heat exchangers will help to understand methods to analyze various types of failure in shell and tube heat exchangers. A sthe is the most common type of heat exchanger in oil re fineries and other large chemical processes, and is suited for higherpressure applications. May 04, 2009 heat transfer 1 heat exchangers heat transfer heat exchanger types of heat exchangers heat exchangers are classified according to flow arrangement and type of construction. Design a double pipe heat exchanger with bare inner multitubes that can be used to cool engine oil with cold sea water. The floating tube heat exchanger is standard equipment in our quadrant sr and srs series thermal oxidizer and has found success in other heat recovery applications. Cpi manufactures a revolutionary shell and tube heat exchanger. Pdf on nov 3, 2011, b gligorijevic and others published analysis of floating head heat exchanger bolts failure find, read and cite all the research you need. Feb 26, 2015 floating head heat exchanger maintainance 1. The input file generated by the hextran gui is given below, followed by the exchanger data sheet and. In any heat exchanger there must be a fluid that requires a change in energy heating or cooling and a fluid. Floating head heat exchanger is widely used for the service where the temperature is high between the shell and tube bundle, or the dirty service, like the petroleum refinery.
The original method employed for head pressure control in this system is to cycle the evaporative condenser fan on and off as needed to maintain the head pressure actually the saturated condensing pressure between 220 and 250 psia 15171724 kpa at all times during the year. Certified print should be checked to insure proper connection of the system piping to the highk heat exchanger. The first type of a heat exchanger is called the recuperative type, in which heat are exchanged on either side of a dividing wall by fluids. These are calculated using a pressure vessel design code such as the boiler and pressure vessel code from asme american society of mechanical engineers and the british master pressure vessel standard, bs 5500. Doublepipe heat exchanger one fluid flows through the smaller pipe while the other fluid flows through the annular space between the two pipes. Fixed and floating head pressure comparison for madison ice. A heat exchanger is a devices used to transfer heat between mediums. Gulley, gulley computer associates, tulsa, oklahoma.
As its name implies, this type of heat exchanger consists of a shell a large vessel. Almost all the systems onboard ship depends on heat exchanger where the fluid is either cooled or heated. Tech scholar coimbatore institute of technology anna university, chennai. In general the tubes in the heat exchanger undergoes expansion when there is a temperature gradient, now if both side of the tubes are firmly fixed then it may bulge as there is no provision for expansion in order to avoid this the tube side bundl. Find out information about internal floating head exchanger. The type of heat exchanger used for a particular usage depends on the application and requirement. Most processes require the heating or cooling of streams to produce a desired temperature before the stream can be fed to operations. Shell and tube heat exchanger can be designed for high pressure relative to the. Heat exchangers are devices that regulate efficient heat transfer from one fluid to another. The first letter of the standards designates the heat exchanger front end while the second letter designates the shell type or the heat exchanger middle section and the third letter designates the heat exchanger rear section.
Choosing a backup generator plus 3 legal house connection options transfer switch and more duration. Floating head heat exchanger design tema api anson. Therein, popular analytical techniques such as log mean temperature difference lmtd and effectivenessnumber of. Heat exchanger the purpose of a heat exchanger is just thatto exchange heat.
In other heat exchangers, heat transfer between fluids takes place through a separating wall or into and out of a wall in a transient manner. As shown in the name of it, in this design, one end of the tubesheet is fixed to the shell, while the other one can float freely inside the shell. Liptak 1970, 1985, 1995, 2005 introduction the transfer of heat is one of the most basic and best understood unit operations of the processing industries. Scribd is the worlds largest social reading and publishing site.
The mechanical design of a shell and tube heat exchanger provides information on items such as shell thickness, flange thickness, etc. Fixed and floating head heat exchanger constructions find widespread application in the power and process industries. Vibrations and fatigue are the examples of most dangerous causes that can cause failure. Shell and tube heat exchanger offer great flexibility to meet almost any service requirement. Temperature control of shell and tube heat exchanger by using intelligent controllerscase study 1, mr. Pdf on nov 3, 2011, b gligorijevic and others published analysis of floatinghead heat exchanger bolts failure find, read and cite all the research you need. Tubeandshell heat exchanger in which the tube sheet at one end of the tube bundle is free to move explanation of internal floating head exchanger. A floating head cover is bolted to the tube sheet and the entire bundle can be removed for cleaning and inspection of the interior.
Tubular heat exchanger inspection, maintenance, and repair. Floating head heat exchanger maintenance heat exchanger leak. Floating head heat exchanger on sales quality floating head. Maintenance procedurefloating head exchanger slideshare.
Heat transfer by shell and tube heat exchangers tema. Lewin heat exchanger design shellandtube heat exchangers heuristic 55. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a. A computer program in matlab has been written for shell and tube heat exchanger design. Oct 11, 2019 different types of heat exchangers are used onboard a ship. Best floating head heat exchanger for sale floating head heat exchanger is one of the most used heat exchanger. Head off heat exchanger errors chemical processing. Aug 18, 2014 this presentation is about maintenance procedure for floating head heat exchanger. Lewin heat exchanger design shellandtube heat exchangers these movies demonstrate the flow of process fluids in a typical shellandtube heat exchanger setup. Jan 25, 2018 the floating tubes sheet is clamped between the floating head and a clamp ring. What is the function of floating head in heat exchanger. In most heat exchangers, the fluids are separated by a heat transfer surface, and ideally they do not mix. The ring which is split in half to permit dismantling is placed at the back of the tube sheet shows the details of a split ring assembly. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising.
Api heat transfer is a proud member of tema tubular exchanger. System piping should be free of debris prior to connection to the highk heat exchanger. Heat exchangers jordan university of science and technology. Simple or composite wall of some kind divides the two. These standards include a threeletter designation of the exchanger type that specifies overall mechanical layout in the form. This presentation is about maintenance procedure for floating head heat exchanger. Pdf analysis of floatinghead heat exchanger bolts failure. A wide variety of floating head heat exchanger options are available to you, such as ce.
The floating tube heat exchanger is unlike any shell and tube heat exchanger. In process calculations, the main objectives of heat exchanger calculations are to. There are many types of heat exchangers applied in the process industry. Gaskets between inlet and outlet connection flanges should be centered to allow unrestricted fluid flow. Internal floatinghead exchanger article about internal. A floating head heat exchanges is a type of shell and tube device with several components, including tubes, tube sheets, shell and shellside nozzles, tubeside channels and nozzles, channel covers, a pass divider and baffles. With high reliability and wide adaptability, floating head heat exchanger has accumulated a wealth of experience during the long term using process, and promoted its development constantly. Analysis of floatinghead heat exchanger bolts failure b. Troubleshooting shellandtube heat exchangers use these techniques and guidelines to ensure more reliable heat transfer d. The figure above shows different arrangements of the shells, tubes and baffles in heat exchangers according to tema standard classifications. Shell and tube heat exchanger provide relatively large ratio of heat transfer area to volume and weight and they can be easily cleaned. Tubes can be cleaned mechanically, chemically, water blasted or steam cleaned.
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