Answer Posted / sabry
If the impulse line connected to the low side of the differential pressure instrument is filled with a suitable fluid, it's called (wet leg).
If the impulse line is empty, it's called (dry leg).
Dry leg & Wet leg is a technique used in differential pressure measuremnt for 2 main reasons:
1 - We use (wet leg) to prevent the dangerous fluid from harming the sensitive instrument.
2 - In closed tank application, we use (wet leg) to prevent vapour condenstion due to temperature variation, so we get a stable/accurate measurement.
Good Luck
Ahmed Sabry
I&C Senior Engineer
Cell:+2 (0122) 1367310
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