Boiler Operation Engineer Interview Question - 12
Q. How it is been decided that RHS or LHS safety valve of steam drum is set at higher pressure ?
Ans.
It is decided based on the slanting angle of steam, drums & CBD line connection.
If drum is aligned horizontally then you can set any side of the Safety valve at higher pressure as there is uniform spreading of sludge in drum.
Whereas if drum is slanted (made down)towards right or left from where CBD line is connected then it is needed to set that side safety valve at higher pressure to avoid carryover of sludge into the safety valve if it blows first.
Such sludge will deposit on safety valves disc & seat which again leads into leakages & wrong operation related issues.
So safety valve of such location is always set at higher pressure.
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