Answer / ronak pujara

water if used directly contains minerals in it which might
cause salt deposits on the inner surface of the tubes and
the boiler shell, which might reduce the heat transfer rates
considerably....
apart from this presence of salts and other minerals
increases the boiling point of water hence increasing the
heat input to it...
due to this reasons, demineralisation of water is done
before feeding it to the economiser...

Answer / debabrata roy

If the water is not treated it may form sludge inside wall
of boiler tubes. which may increase day by day. Increase
sludge layer decrease proper heating of water inside boiler
tube. It will cause heat loss and also efficiency of boiler
will decrease. Thats why boiler feed water should properly
treated in water treatment plant.

Answer / vijendra kumar pal

For boiler tube & line sefty.

plz anyone provide me the sample test papers of ONGC as of i m from Mechanical engg bakground and would be appearing for the test in the june 2010. My email id - neeraj_94312@rediffmail.com

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