Tubes can expand freely, the channel head and shell cover arrangement are convenient for inspection, and the tube bundle can be removed easily for cleaning. The fluids may be separated by a solid wall to prevent mixing or they may. The choice of shell and tube type is determined chiefly by factors such as the need for the provision for differential movement between shell and tubes, the design pressure, the design temperature, and the fouling nature of the fluids rather than the function. Floating head designs of head exchangers in an effort to reduce thermal stresses and provide a means to remove the tube bundle for cleaning, several floating rear head designs have been. It consists of a stationery tube sheet which is clamped with the shell flange.
Fixed and floating head heat exchanger constructions find widespread application in the power and process. 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. Floating head heat exchanger design tema api anson. Shell and tube exchangers an overview sciencedirect topics. They are widely used in space heating, refrigeration, air conditioning, power stations, chemical plants, petrochemical plants. Therein, popular analytical techniques such as log mean temperature difference lmtd and effectiveness. 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. What is the function of floating head in heat exchanger.
The ring which is split in half to permit dismantling is placed at the back of the tube sheet shows the details of a. Cn102359850a assembly for pressure test of floating head. Floating head the floating head heat exchanger is the most versatile type of from a 1 at selcuk universitesi. The floating tube heat exchanger is unlike any shell and tube heat exchanger.
Plate and frame heat exchanger pfhe is smaller and therefore more compact. Tema type bem would have the b representing the front head, the e the core or middle section and m representing the rear head designs. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed. Oil industry heat exchanger drawing labels, details, and other text information extracted from the cad file. Compare the calculated overall heat transfer coefficient you obtained from the previous step with that you assumed in step 8. Lewin heat exchanger design shellandtube heat exchangers 12 fixed head 12 floating head. The term heat exchanger applies to all equipment used to transfer heat between two streams. Tube sheet heat exchangers of the big advantages of using a shell and tube heat exchanger is that they are often easy to service, particularly with models where a floating tube bundle where the tube plates are not welded to the outer shell is available. At the opposite end of the bundle, the tubes may expand into a freely riding floating. The response of the two tubesheets to external mechanical andor thermal loading is not independent. Floating head designs of head exchangers in an effort to reduce thermal stresses and provide a means to remove the tube bundle for cleaning, several floating rear head designs have been established. Tubeandshell heat exchanger in which the tube sheet at one end of the tube. The invention discloses an assembly for a pressure test of a floating head type heat exchanger.
It is specially designed to be completely stressfree to promote longer equipment life and virtually no maintenance. 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. 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. Scribd is the worlds largest social reading and publishing site. Floating head assembly for shell and tube type coolers or heat exchangers. A liquid twophase fluid heat exchanger is referred to as a compact heat exchanger if the surface area density on any one fluid side is above about 400 m2m 3 122 ft2ft3. The shellandtube heat exchanger is a nonfired pressure system consisting of two. Tema stands for tubular exchangers manufacturers association and is a set of standards that were developed by leading shell and tube manufacturers. Floating head the floating head heat exchanger is the most. Floating head heat exchanger on sales quality floating head. Fixed and floating head heat exchanger constructions find widespread application in the power and process industries. In a floating head heat exchanger, one end of the tubesheet is fixed to the shell, while the other one can float freely inside the shell.
Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Floating head heat exchanger maintainance slideshare. Issn 2348 7968 optimization of tubesheet thickness of. Floating head shell and tube exchangers floating head exchangers are used when the media being handled causes fairly rapid fouling and the temperature creates expansion problems. Counter flow heat exchangers are the most efficient of the three types. In a shell and tube heat exchanger having a floating head and a floating tube sheet to which said floating head is connected during the assembly of said exchanger and having tubes connected to said tube sheet, the improvement which comprises a positioning support member extending outwardly from the face of said tube sheet near the upper end thereof in a direction opposite said.
This course is intended for graduates or soon to be, designers, freelancers, technicians and engineers involved in. A floating head is excellent for applications where the difference in temperature between the hot and cold fluid causes unacceptable stresses in the axial. In a shell and tube heat exchanger having a floating head and a floating tube sheet to which said floating head is connected during the assembly of said exchanger and. Heat exchanger is an important and expensive item of equipment that is used almost in every industry oil and petrochemical, sugar, food, pharmaceutical and power industry. Heat exchanger tubesheet layouts h a fixed tubesheet exchanger b utube exchanger c floating head exchanger with split backing ring d pull through floating head exchanger reproduced with permission from heat exchanger design, e. In this type of exchanger the tubesheet at the rear header end is not welded to the.
In contrast to the parallel flow heat exchanger, the counter flow heat exchanger can have the hottest coldfluid temperature greater than the coldest hotfluid temperatue. Aug 18, 2014 this presentation is about maintenance procedure for floating head heat exchanger. For an easy inspection of the floating head in its instal lation position, the. Many a times some issues occurred in the heat exchanger.
Tubesheets in fixed and floating head heat exchangers. Floating head heat exchanger on sales quality floating. A heat exchanger is a device used to transfer heat between a solid object and a fluid, or between two or more fluids. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Pdf analysis of floatinghead heat exchanger bolts failure.
The exchange can take place between a process stream and a utility stream cold water, pressurized steam, etc, a process stream and a power source electric heat, or between two process streams resulting in energy integration and reduction of external heat sources. Numerical simulation with htri software and thermal design with manual calculation for heat exchanger design 25%. In floating head heat exchangers, the sealing strips should be installed in order to reduce the product. The fluids may be separated by a solid wall to prevent mixing or they may be in direct contact. 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. Floating head exchanger p, s, t and w type rear headers. 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. Shellandtube heat exchangers funke warmeaustauscher. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a. The inspection of heat exchangers is the one area of equipment inspection where i firmly advocate the use of a. Tube sheet heat exchangers of the big advantages of using a shell and tube heat exchanger is that they are often easy to service, particularly with models where a floating tube bundle where. Inspection procedure for shell and tube heat exchangers. Heat exchanger and its types engineering solutions. Heat transfer equipment may be designated by type or function it performs, such as chiller, condenser, cooler reboiler, etc.
Heat exchangers heat exchangers are used to transfer heat between two sources. The tubes may be permanently positioned inside the shell fixed tubesheet exchanger. A floating head exchanger is suitable for the rigorous duties associated with high. A plate heat exchanger, phe, is a compact heat exchanger where thin corrugated plates some 0. A floating head exchanger is suitable for the rigorous duties associated with high temperatures and pressures but is more expensive typically of order of 25% for carbon steel construction than the equivalent fixed tubesheet exchanger. Nonconformities definition any change in the condition of an item described on the. Lewin heat exchanger design shellandtube heat exchangers 12 fixed head 12 floating. 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. Us2691508a floating head assembly for shell and tube type. In general, for the calculation and design of the different components of heat exchangers, in this document the criteria set by tema code is. Heat transfer by shell and tube heat exchangers tema.
The assembly comprises a doublecylinder assembly which is connected with a side flange on. Fixed tube sheet heat exchangers used on fixed tube sheet heat exchangers. Inspection procedure for shell and tube heat exchangers printed. Split ring type heat exchanger floating head joint leak. Therein, popular analytical techniques such as log mean temperature difference lmtd and effectivenessnumber of. 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. The simplest is a pullthrough design which allows the tube bundle to be pulled entirely through the shell for service or replacement. Floating head support system for shell and tube heat exchanger. A heat exchanger is a devices used to transfer heat between mediums. In floating head heat exchangers, the sealing strips should be installed in order to reduce the. Floating head heat exchanger cross section view assemblv fmawvg head 3 3 3 back cover 4. The choice of shell and tube type is determined chiefly by.
Exchanger inspection 101 visual inspection of shell and tube heat exchangers. To allow for thermal expansion floating head designs types p,s,t. It is specially designed to be completely stressfree to promote longer equipment life and virtually. We have included on that figure the nomenclature to be used in subsequent derivations. Special designs are available for particulate ladened air streams, corrosive applications, high temperatures, and high pressures. The term heat exchanger applies to all equipment used to transfer heat.
Find out information about internal floatinghead exchanger. R sekulib university of kentucky introduction a heat exchanger is a device that is used for transfer of thermal energy. Heatexchanger tubesheet layouts h a fixed tubesheet exchanger b utube exchanger c floatinghead exchanger with split backing ring d pull through floatinghead. A floating head heat exchanges is a type of shell and tube device with several components, including tubes, tube.
Find out information about internal floating head exchanger. At the opposite end of the bundle, the tubes may expand into a freely riding floating head or floating tube sheet. Heat exchanger maintenance training animation types. 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. The inspection of heat exchangers is the one area of equipment inspection where i firmly advocate the use of a check list to make sure you got everything. If you continue browsing the site, you agree to the use of cookies on this website. We have been facing frequent failures in floating head joint of split ring type shell and tube heat exchangers. Us2691508a floating head assembly for shell and tube. The floating tubes sheet is clamped between the floating head and a clamp ring. Jul 20, 2016 tema designations refer to portions of the unit that make up the complete heat exchanger. Shell and tube heat exchanger sthe has a larger area and is not as compact as the pfhe. A heat exchanger is a device built for efficient heat transfer from one medium to another.
722 1114 677 1574 79 851 606 1099 497 732 557 1365 610 181 838 1453 658 494 355 1625 1603 1214 234 959 716 515 663 1220 1453 677 603