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REPAIR PROCEDURE OF FIRE TUBE BOILERS

on July 31, 2022 BOILER

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on July 27, 2021

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REPAIR PROCEDURE OF FIRE TUBE BOILERS

TUBE TO TUBE SHEET LEAKAGE Check visually and mark the area where leakage is observed. Remove the water from boiler Carry Out Dry Penetrant * (D.P) Examination Of Weld and about 25 To 30 mm Inside Circumferences of tube. If visual Examination or D.P Test confirms leakage is through tube, it means tubes is cracked and it must be replaced If the leakage is through weld mark the area from where leakage is observed Remove the defective weld completely Carry out D P test to confirm defect is removed completely Clean the area thoroughly and preheat the area to 100 deg minimum. Weld root pass using # E7018 @ 3.15 mm electrodes only After root pass carry out d.p test to confirm sound root Clean the area and again preheat to 100 Deg C. minimum Complete the welding using E 7018 @ 3.15 mm electrode Ensure cleaning between subsequent passes Carry out the D P test to confirm the weld Conduct the hydro test to confirm no leakage occurs Alternatively E 6013 electrodes can be used if welder...

HEAT RECOVERY STEAM GENERATOR

The subject of waste heat recovery, though now new, is talked about all over the world, today, and almost in every sphere of activity. Fast depletion of coal reserves and ever-increasing oil prices are resulting in the increased unit cost of electrical power which necessitates the system designer to select a process or a system with a maximum heat recovery for plant economics. Waste heat utilization generates energy, practically at no fuel cost. Thus energy production from waste heat reduces the cost of energy and conserves the other scarce sources of energy, which are fast depleting. A Waste Heat Recovery System can be broadly defined as any system, which recovers the heat, which is otherwise wasted. The WHR system can be designed to meet the process steam requirement in which case, the system consists of a Heat Recovery Steam Generator (HRSG) also called as Waste Heat Recovery Boiler with associated auxiliaries. In case there is no requirement of process steam, the WHR system...

THE COMBUSTION PROCESS IN GAS TURBINES

The combustion process is of critical importance to the gas turbine cycle because in this process only heat energy, which is later converted into work by the turbine, is released from the fuel. Therefore, any losses incurred in the combustion process have a direct effect on the thermal efficiency of the cycle. Despite the importance of the combustion process, normally it receives lesser attention than the expansion, compression, and heat-transfer processes. Owing to its extreme complication, this process is not completely understood, and no rigorous analysis has been made. An empirical or trial-and-error approach is therefore adopted instead. Furthermore, it is not too difficult to achieve a combustion efficiency of 98 % with a static pressure loss of less than 5%. This, of course, raises the question of the efficacy of attempts at further improvement. However, there is a real need for reducing the size of combustors, increasing their life and...

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REPAIR PROCEDURE OF FIRE TUBE BOILERS

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