These sheets, which are called plates, are very fine and grooved to enable the diffusion of the. Shell side of shell and tube type heat exchanger to check leakage from tube to tube sheet plate reinforcing pad of nozzle line vessel, when necessary 2. If the heat exchanger is located at the inlet or discharge of a blower with a pulsating flow, such as a roots type rotary lobe blower, the heat exchanger must be protected from the pulsation by a chambered silencer. The pressure test is an important final step of maintenancerepair actions. Bfwoperating pressure 85 kgcm2, temp 160c shell side fluid. With the path to the pressurerelief device blocked, the heat exchanger ruptured catastrophically.
Heat exchanger the purpose of a heat exchanger is just thatto exchange heat. 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. The lower test pressure value corresponding to the maximum allowable working pressure mawp lessens the likelihood of gasket damage and leakage. Can anyone please point me to a source for determining the correct procedure for hydrotesting the various search for. May 19, 2018 asme section viii division 1, ug99 specifies the hydrostatic test conditions for pressure vessels and heat exchangers. It is a ideal design method when the heat medium is steam.
Jan 09, 2014 green berets ultralight bug out bag with gear recommendations duration. The hydrostatic test pressure shall be as specified in the approved vendors drawing, and it shall be held for at least half an. The purpose of this specification is to define a minimum common set of supplementary requirements for the specification for procurement of shellandtube heat exchangers in accordance withapi standard 660 9. With a plate type heat exchanger, the heat penetrates the surface, which separates the hot medium from the cold one very easily. Shellandtube heat exchangers funke warmeaustauscher. Hydrotesting procedure of shell and tube heat exchanger. The heat exchanger inspection article provides you with information about the inspection of the heat exchanger and heat exchanger testing during the manufacturing phase, as well as inservice inspection in operating units.
Test pressure should register on the gauges as close to the 12 o’clock position as possible. Pdf during its fabrication hydrotest, the flanged joint between the tubesheet and the channel of a shell and tube heat exchanger leaked. Hydrostatic testing of heat exchangers may 24, 2001 4 comments related topics. Asme uhx and tema heat exchanger software codeware.
Misaligned flanges can induce extraneous stresses in the vessel walls and are subject to leakage as well. Hydrostatic test shall normally be carried out for all vessels by use of water. However, the term is commonly used to equipment in which two process streams exchange heat with each other. Floating head heat exchanger design tema api anson. Allegheny bradford corporation allegheny bradford offers a. Microbiologically influenced corrosion of stainless steels. Can anyone please point me to a source for determining the correct procedure for hydrotesting the various. I want to know, how much time, pressure to be kept. Hydro test procedure for heat exchanger gas technologies. 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. Pdf shellandtube heat exchangers for general refinery.
The hydrotesting procedure of a shell and tube heat exchanger requires you to fill the shell and tubing with water that had a color dye added to it. It is the shell and tube heat exchanger temperature, considering normal operating conditions. Test pressure and holding time shall be as follows. Jan 22, 2020 heat exchanger hydrotest procedure pdf hydrotest procedure of heat exchanger at site. The heat exchanger must be isolated from system vibrations using flexible piping connections and isolation pads on the mounting feet. There are a variety of methods of inspecting or testing heat exchangers. Shellandtube heat exchangers for general refinery services api standard 660. Csb investigating causes of fatal rupture of heat exchanger.
If you need asme uhx and tema mechanical design calculations, drawings and reports then the compress heat exchanger option is for you. The term heat exchanger applies to all equipment used to transfer heat between two streams. Asme pressure vessel heat exchanger hydrostatic test for internal. Asme section viii division 1, ug99 specifies the hydrostatic test conditions for pressure vessels and heat exchangers.
Hydro test procedure for heat exchanger free download as pdf file. Both horizontal and vertical heat exchangers can be modeled. If the heat exchangers were builttoorder, it carried an alphanumeric number called a qnumber. May 24, 2001 heat exchangers are pieces of process equipment built and designed for maximum efficiency of heat transfer between two different machines or mediums. On the morning of the accident, an operator used steam to clean out process piping. In any heat exchanger there must be a fluid that requires a change in energy heating or cooling and a fluid. Quick startup and shutdown is a major cause of heat exchanger damage. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid. Damage mechanisms also referred to as degradation mechanisms is a general term referring to any. Heat exchangers hydrostatic test procedure heat exchanger.
The optimum heat transfer rate takes place in a balanced counter flow heat exchanger and by using this optimum rate of heat transfer, the concept of heat exchanger efficiency is introduced as the. Same as with the design pressure, this value is defined by the thermal design. The steam heated the liquid ammonia remaining in the exchanger shell which caused the pressure to build. This is a draft and must be edited based on your po requirements. The plate heat exchanger shall be operated by persons who have studied the instructions in this manual and have knowledge of the process. For pressure testing following major modifications involving through wall welding on a pressure boundary. The plate heat exchanger is a device that permits recovery of the heat contained in a fluid being transferred to another fluid.
Jun 11, 2008 on the morning of the accident, an operator used steam to clean out process piping. The greater the temperature difference, the smaller will be the required heat transfer surface. Supplementary specification to api standard 660 shellandtube heat exchangers page 4 of 63 s614 december 2018. Supplementary specification to api standard 660 shell and. Discussion of the detailed anatomy of the heat exchanger and the. Heat exchangers hydrostatic test procedure free download as pdf file. The heat transfer performance of a heat exchanger is the product of. If a heat exchanger was built to the factory standard design, it carried a six digit number, the first three being the commodity code indicating the type of unit. A heat exchanger is a device that is used to transfer thermal energy enthalpy between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at different temperatures and in thermal contact. The plate heat exchanger is made up of a variable number of grooved metallic plates so that the fluids between which the heat transference takes place can flow through. Searching documents and internet sources the following is what i found on heat exchanger inspection methods and sources. These plates form channels that allow the alternation of the fluids in countercurrent. Green berets ultralight bug out bag with gear recommendations duration.
Both fluids never touch each other because they are separated by metallic sheets. How do you conduct hydrotest on shell tube heat exchanger. Inspection of unit at regular intervals and as frequently as experience indicates, an examination should be made of the interior and the exterior of the heat exchanger. Anson can manufacture u tube heat exchanger in accordance with the asme standard, tema, and api for 1, 2, or 4 pass u tube heat exchanger, other special requirements. All heat exchangers shall receive a shop hydrostatic test in accordance with the. Manuals for the hisaka plate heat exchanger consist of the following seven related documents.
Hydrostatic testing of heat exchangers inspectioneering. There are many areas on a heat exchanger that you can not get to for visual inspections while the heat exchanger is in the furnace. This includes knowledge of precautions regarding media type, pressures, temperatures in the plate heat exchanger as well as specific precautions required by the process. Up to eight design conditions can be investigated for fixed, utube, kettle and floating tubesheet style exchangers. Heat exchanger hydrotesting procedures svanels petroleum 12 mar 05 18. Ramesh, if the corrected hydrotest pressure for the shell side is lower than the design pressure of the tube side then a psv would be required considering a tube rupture case for the shellandtube exchanger corrected hydrotest pressure is defined as follows. Asme pressure vessel heat exchanger hydrostatic test for. It is therefore possible to heat or cool fluids or gases which have minimal energy levels. The code provides for testing at higher hydrostatic test pressures but most pressure tests are at the 1. Case histories from experience and the published literature illustrate factors which resulted in microbiologically influenced corrosion mic of stainless steel piping, storage tanks and heat exchangers by waters used for hydrotesting, cooling and other purposes.
Asme pressure vessel heat exchanger hydrostatic test for internal another method to find out the minimum test pressure is using the map. During boiler testing, i have seen that boiler inspector normally ask immediately to release the pressure after his visual inspection say max 30 min. The heat transfer analysis is done by considering water inside the tube and steam on shell side. Jul 07, 2019 heat exchanger hydrotest procedure pdf hydrotest procedure of heat exchanger at site. Exchanger inspection 101 visual inspection of shell and tube heat exchangers. As one end of the tube bundle is float, the heat exchanger can be guaranteed safety even under the extreme heat cycle.
Most processes require the heating or cooling of streams to produce a desired temperature before the stream can be fed to operations. The design of shell and tube heat exchanger using kern method for water and steam combination is validated by wellknown dittusboelter equation of turbulent flow inside tube. A 12 shellandtube heat exchanger is illustrated in figure 5. Charge the tank to the selected temperature and set the heat exchanger inlet temperature at the selected differential above the tank. Plate heat exchanger 2 operation and maintenance manual. 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. Is the same rule apply for shell and tube heat exchanger alsoor applicable for. An odd number of tube passes is seldom used except the 11 exchanger.
Hydrostatic test for heat exchanger floating head aes. Sample test procedure tanks with integral heat exchangers. A heat exchanger follows this principle in its endeavour to reach equalisation. Typically it are the vacuum jet overhead condensors gases and cooling water in the tubes. In most industrial processes, the loss of heat is very. 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. For the pressure test following minor heat exchanger work. Plate heat exchanger inspection and test plan this plate heat exchanger inspection and test plan article provides you with a sample plate heat exchanger itp. Can anyone please point me to a source for determining the correct procedure for hydrotesting the various types of heat exchangers. Shellandtube heat exchangers can have multiple passes, such as 11, 12, 14, 16, and 18 exchangers, where the first number denotes the number of the shells and the second number denotes the number of passes. The fluids are always separated by two gaskets for security reasons.