 Hello friends, myself, Prof. S. P. Mankani, Assistant Professor, Department of Mechanical Engineering, Valchand Institute of Technology, Solaapur. So today we are going to discuss about Cochran boiler. See at the end of this lecture, students will be able to understand the working of Cochran boiler. See here just the constructional details has been displayed in this particular slide. So different parts are given. So in this particularly we are going to be studying it as the working advantage as well as the different parts means the construction parts are concerned. So here the overall view if you are going to observe it here I given this one representation as a red color. So which is indicating it as at a higher temperature and this particularly we are taken it as a blue color with this one as a water is there and here the stream part. So this particularly the boiler is a fire to boiler. So this particular Cochran boiler is more popular in our area as far as Solaapur district is concerned. So in couple of industries we are having this particularly a Cochran boiler because of it can be installed easily as well as so this is going to be utilizing the lower quality of the fuel and the requirement of the textile industry is going to be fulfilled by this Cochran boiler. Because it doesn't require as a more the high pressure boilers are concerned. So as far as the units are related. So here coming to this particularly as the Cochran boiler the constructional detail we are going to study and as well as the working and then advantage and disadvantage. So here considering this as a constructional details. So here this is the fire door is concerned here the fuel is going to be there on this particularly grate. So this particular grate so this on this particularly we are going to be putting this one as a fuel. So this particular advantage of this Cochran boiler is we are going to be using a lower quality of the fuel even some of the wastages also they are going to burn in this particular Cochran boilers. So here this damper is provided on the grate and a blow off Coch is given in the left side of this diagram. So when the fuel is burning on this particularly the grate. So that fuel creates the the flue gases the flue gas start flowing in this particular path which is given as a red color arrow mark. So here in this particularly the pipelines the flue gas is going to flow and this we are going to be calling it as a fire tube boiler with a reason that the flue gases are passing through the tubes and water is surrounding this particular tubes and that is the reason we are going to call this as a fire tube boiler and it is a low pressure boiler. So the flue gases while it is passing through this particularly tube it transfer the heat energy to the water which is surrounding towards this particular pipelines. The flue gases come to this one as the smoke box here the partial this one in the this particularly smoke box the some part of the the dust is going to be extracted here. The remaining flue gases is going to flow through this particularly chimney. So as far as the detail of this particular chimney is a separate topic the designing of this particular chimney is a separate topic we are not going to discuss that one just we are going to consider this part as a important as this level of this particular smoke has to go in such a level that it should not harm the normal movement of the birds are concerned. The flue gas has to cross that much this area is concerned. So then coming to this one as this particular portion is the steam portion this is a steam portion and remaining this one is a water portion. So here this one is given as the external shell of this one the boiler. So inside this there is a high pressure steam we are going to calling this as a superheated steam in this particular shell. So here the anti-priming is provided in the steves stop wall. So through this one we are going to be using the steam for our working of industrial purpose. So the high pressure steam we are going to be taken through this one. This here given as the steam stop wall and here one more the notation is given as a steam or this safety wall here is a safety wall. So while you are studying of this Cochran boiler just you compare with your household this one as the cooker. So in the cooker also they are going to be providing as a one safety wall they are going to provide it. So it is a safety purpose the name itself indicating it as a safety purpose. So and below that one there is a pressure gauge is there below that one there is a pressure gauge. So it is indicating the pressure of the steam inside this shell pressure of the steam inside this shell. So then there is a manhole is provided in this one. The manhole is the size of this manhole just for your understanding purpose we are going to discuss that as it is a size of this hole is a normal man can enter inside through this one and just he can clean it all the related here in the parts and then he can come out from this this is a manhole they are provided for a cleaning purpose. So then coming to this one as this external part of the shell and here there is a water level indicator. So this is a water level indicator this indicates how much the water is there inside this particularly the boiler. So water level indicator is one of the important this one indicate this one as for indication of the level of the water. So these all are coming as this all are the integral part of the boiler. These are the mountings of the boiler. So here one more word is coming as the accessories of the boiler and mountings of the boiler. So mountings is the integral parts. So without that the boiler cannot work effectively. When you go to the accessories part those are related as the increasing the performance of the boiler is concerned. So here there is a one fusible plug provided here. This plays the important role when there is a water inside this particularly the boiler is going to a level less. Here there is a water level indicator is also there. So this is for the regular observation of working and in any case if the water level is going below that one in any emergency cases. So this particular fusible plug is going to be operating. So means the temperature crosses that time in the emergency cases this fusible plug is going to be coming in the picture. So that time if it opens if it crosses that particular temperature by any other reasons also so that time this fusible plug is going to be dissolved means the excess temperature. So that time this whatever the water is there inside that will come on this particularly through this path on this one as a grid means it will stops the further burning of the fuel. It is for the emergency working it is for safety purpose. So coming to this one this we have discussed about the city wall. So coming to this the rest of the this informations we are going with this one as the firebox and this is a vertical feed pipe and this is a fuel a fuel pipe. So this we are going with the next this one I given all the details you may refer all individual parts also I explained already the detailing I given it those particular information about the detail part. So just you can observe this the great of this chamber as well as the working just I given this one as a JIF the for understanding purpose working. Just you can observe here the flue gases how exactly it passes through this particular aero mark I have shown it then it will go to the chimney and that goes to the exhaust and here in this particular part the storage of the steam is going to be taken place rest of the total content will be there as a water on this particular surface because the heat is going to be transferred through this one. So let me know so this boiler either it is a water tube boiler or a fire tube boiler this boiler is a fire tube boiler the reason is that the flue gases are passing through the pipes and surrounding that one there is a water. So that is the reason we are going to be calling this as a fire tube boiler. So just you can observe this diagram here there is a firing is going to be taken place on the grid the fuel is going to be supplied through this field door. So then this flue gases are passing through this particularly pipe just you can observe neatly so then it will come through the chimney then it goes to the atmosphere. Just for it is an understanding of the working principle of this particularly the Cochrane boiler thank you for further part of will be covered in the next lecture thank you.