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what the differant between Wet Leg /Dry Leg
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Answer Posted / www.islamqa.com
They are diffrential pressure transmitter "installation
technique" used in "level measurement"
When installing diffrential pressure transmitter we attach 2
impulse lines with high & low transmitter sides, the 1
attached to low side is empty impulse line so it is "dry
leg" or it's filled with a sealing liquid with density
greater than the process liquid so it is "wet leg".
We use "dry leg" for closed pressurized tank.
We use "wet leg" for closed pressurized tank also but if we
have the probability of process liquid condensable vapor
which will give a faulty measurement.
If we have an open tank, the Tx low side is atmospheric.
Regards,
Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
CELL.: 00 2 0121367310
ahmedsabry.onine@gmail.com
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