how many manhole should be there on boiler? why?
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Answer Posted / magesh
First of all what is a man hole?
It is a small opening provided in the boiler outer surface,
through which men can enter inside the boiler during the
maintenance time.
There are no restrictions in limiting manholes to 1 or 2.
Wherever human entry is must during maintenance, there
provided the Man Holes.
Usually Man Holes are provided in the following areas.
1. Furnace Bed area at two sides.
2. Top near the superheater coils area
3. Economiser casings
4. Airpreheater casings
5. Bunker.
6. Even in some high capacity fans.
7. Ductings.
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