Most of the cases.. Custumer ask for expected boiler life & we tend to say approx 10 years.. How one arrive at this figure? I’ve asked this question so many time to may expert inthis field but not able to get any satisfactory answer. Recently i went thru ASME VIII Division1 , where the Fatigue…
OK..Now the big question.. the flow parameter Re & thermal parameter Pr, how they connects to HEAT TRANSFER??? So for our help.. Mr. Nusselt has created Nusselt Number!! The traditional dimensionless form Nusselt number Nu, which may be defined as the ratio of convection heat transfer to fluid conduction heat transfer under the same conditions.…
Lets See.. “CONVECTION HEAT TRANSFER” Heat transfer occur when there is Delta T Across the two bodies.. heat always flow from hot side to cold side. Heat transfer may occur under natural draft or under forced circulation. Industrial heat transfer equipment are mostly occur under forced condition. As discussed above, one can conclude that the…
The discussion is IS 4503 Oriented. IS 4503 is the code for heat exchanger .. Type of heat exchanger Fixed Tube Plate U Tube Floating head Classification on Pressure 2.5 kg/cm²(g) 6.3 kg/cm²(g) 10 kg/cm²(g) 16 kg/cm²(g) 25 kg/cm²(g) 40 kg/cm²(g) Classification on Temperature Max. Allowable Metal Temperature Carbon Steel : 250ºC SS : 120ºC…
Lets do the Quick CaclulationInputsActul Flow in m3/hr ?Design head MWC ?Operating head MWC ? Minimum Flow required for safer operating of the pump ?How the by pass is maintained, using Orifice or control Valve ?Let Boiler Steam flow rate is 31000 kg/hr Flow32.488 m3/hr X 1.05 (design factor) + Min. bypass flow via orifice…
Design of any heat exchanger is manly depend upon the flow configuration.As discussed before the configuration could be of three type (majourly) Parallel Flow Counter Flow Cross Flow The compactness increases from Parallel flow to Counter Flow to Cross Flow While complexity increases in reverse direction. The superheater has flue gas on one side &…
One thing we must remember while designing super heater.. Better the steam dryness compact will be the super heater. One must always ensure that dry steam (99%) is coming in the superheater.Just to give you the picture.. for 98% Dry steam.. the unit energy required to make steam 100% dry+70ºC superheat is : 61.5kcal/kg for…
VALVES FUNDA
Lets start this session with some overview on Control Valves. A power operated device, which modifies the fluid flow rate in a process control system. It consists of a valve connected to an actuator mechanism that is capable of changing the position of a flow controlling element in the valve in response to a signal…
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