Lab Manual | Babcock and Wilcox boiler and Cochran boiler

Objective: To study about Babcock and Wilcox boiler and Cochran boiler.

Babcock and Wilcox boiler

Babcock and Wilcox is a water-tube boiler is an example of horizontal inclined tube boiler it also a High Pressure Boiler.

Construction: Babcock and Wilcox boiler with longitudinal drum. It consists of a drum connected to a series of front end and rear end header by short riser tubes. To these headers are connected a series of inclined water tubes of solid drawn mild steel. The angle of inclination of the water tubes to the horizontal is about 15° or more.

Working: The fire door the fuel is supplied to grate where it is burnt. The hot gases are forced to move upwards between the tubes by baffle plates provided. The water from the drum flows through the inclined tubes via down take header and goes back into the shell in the form of water and steam via uptake header. The steam gets collected in the steam space of the drum. The steam then enters through the antipriming pipe and flows in the superheater tubes where it is further heated and is finally taken out through the main stop valve and supplied to the Steam turbine or Steam engine when needed.


The pressure of steam in case of cross drum boiler may be as high as 100 bar and steaming capacity upto 27000 kg/h.

At the lowest point of the boiler is provided a mud collector to remove the mud particles through a blow-dawn-cock.

Cochran boiler

It is one of the best types of vertical multi-tubular boiler, and has a number of horizontal fire tubes it also a Low Pressure Boiler.

Construction: Cochran boiler consists of a cylindrical shell with a dome shaped top where the space is provided for steam. The furnace is one piece construction and is seamless. Its crown has a hemispherical shape and thus provides maximum volume of space.

Working: The fuel is burnt on the grate and ash is collected and disposed of from ash pit. The gases of combustion produced by burning of fuel enter the combustion chamber through the flue tube and strike against fire brick lining which directs them to pass through number of horizontal tubes, being surrounded by water. After which the gases escape to the atmosphere through smoke box and chimney.


  • Shell diameter 2.75 m
  • Height 5.79 m
  • Working pressure 6.5 bar (max. pressure = 15 bar)
  • Steam capacity 3500 kg/hr (max. capacity = 4000 kg/hr)
  • Heating surface 120 m2
  • Efficiency 70 to 75% (depending on the fuel used)


23 Responses to “Lab Manual | Babcock and Wilcox boiler and Cochran boiler”

  1. fahim

    Best work, GOD bless all your team.
    Keep doing. Best regards. Thanks.

  2. harpinder

    if u give digram colured than its more intersting

  3. arvind

    if possible attached the working of lanchasire and locomotive boiler

  4. admin

    Goto the link:

    Here you will find the details about Lancashire boiler and Locomotive Boiler.


  5. arvind



    so,i am very happy. i get the more knowedge according to my book; thank you very much

  7. vinod kumar

    please give lab manual of thermodynamics acc to uptu syllabous . with diagram coloured

  8. omkar

    What is FP in the cochran boiler diagram?
    please let me know as soon as possible. 🙂

  9. gajanan patil

    have a information about working principle of boiler

  10. himanshu

    @omkar– its fusible plug.

  11. tushar

    very good, by this information we can improve our knowledge, thanks…….

  12. nikhil bedre

    Thanks for giving knowledge about cochran boiler

  13. virendra ku.

    Very easy to understand and interesting..

  14. RC

    Hey Bastard Whats The Meaning Of FB in COCHRAN BOILER

  15. admin

    We were not asking your name dear. Thanks for visiting us, if you dont like us, there is no need to visit here again.


  16. Anyewi George


  17. Tirath Kumar

    Lab manuals of IC engine % gas turbine lab

  18. Tirath Kumar

    please provide the lab manuals of IC engines & Gas Turbine lab.

  19. ravalika

    thank you for mentioning the specifications of cochran boiler it would be nice if you mention specifiations for babcock also….

  20. ravalika

    thank you for mentioning specifications for cochran boiler it would be nice if you mention specifications for babcock also….

  21. Pritam Ghish

    May i have the applications of different types of boilers?
    It’s urgent 🙂

  22. Vikas rajpoot

    Hi, it is really good for first year students there is no need to buy any lab manual suggested by collage store

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