Answer / karthick

1.high alkalinity causes scale formation on the walls of
the heating surface so it reduces the heat transfer from
the surface to water.
2.the ph value is very difficult to be adjusted
3.eye and skin irritation
4.it affects the feed water treatment by poor filtration of
water

Answer / chanakyapitti

PH of water will indicate the characteristic of water. Normal water has ph value 7, weather it will decrease the water change as acid.If it will raise above 7 the water will change as base. Further raising of ph above 10.2 it will leads the caustic embitterment. This will form in inner surface of boiler tubes as scale which was heat resident. Due this scale the heat transfer rate will be decreased by increasing the layer thickness in the tube. Overheating of tube will occur. because of overheating tube will be damaged. so that boiler water PH should be with in limits between 9.6-10.5

can anybody provide me the HPCL apptitude papers?am having the test on this feb 19th 2008 so plz

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