Examples of internally fired boilers - Basic Mechanical Engineering

Q.  Lancashire boilers are ______
- Published on 01 Sep 15

a. externally fired boilers
b. internally fired boilers
c. both a. and b.
d. none of the above

ANSWER: internally fired boilers


  • Mukesh Maske   -Posted on 24 Dec 21
  • Sravanthi    -Posted on 12 Nov 15
    - A closed pressure vessel used to generate steam under pressure is called as boiler.

    - Different boilers are classified depending upon

    1) Position of furnace:

    a) Internally fired boilers: Locomotive and Lancashire boilers have furnace inside the body of boiler shell and hot gases passing through tubes are surrounding by water. Lancashire boilers have working pressure in the range of 0.7 Mpa to 2 Mpa. The efficiency of this boiler is 65% - 70%.

    b) Externally fired boilers: Babcok-Wilcox boiler, Loeffler boiler, etc have furnace outside the boiler shell. In these furnaces, water passing through tubes is surrounded by hot gases.

    2) Method of circulation: According to method of classification these are classified as:

    a) Natural circulation: In these boilers, water is circulated by natural convection. Water flows from high density to low density due to temperature gradient which causes density gradient along the tube. Babcok- Wilcox is an example of this type.

    b) Forced circulation: In these boilers, water is circulated using centrifugal pumps which are driven by an external power source. High pressure boilers generally use this method of circulation. Water is circulated by forced circulation in Lamont and Loeffer boilers.

Post your comment / Share knowledge

Enter the code shown above:
(Note: If you cannot read the numbers in the above image, reload the page to generate a new one.)