hi
i hope all of u will be fine and shine....
well i have engaged now a days in modification of a tank. the problem which i faced is that of breather valves.
Existing breather valves are 2Nos. of dia 6" and now requirement increases. Consultant has recommended that intall a new breather of dia 10" to meet the requirment of inbreath and outbreath.

My supervisor asked me to use the Manhole for that breather.i.e. he wish to fabricate a plate/hollow plate for manhole with breather valve, to be welded on that plate.

1. Purpose of Manhole?
2. if i use the manhole for breather purpose wat will be the adverse effect of that?
3. if i use the manhole, how will i acheive the purpose of manhole?
4. can some one share the detail how to fabricate that plate?\



Manhole size is of dia 24"

Thanks and best rgrds