Answer / www.islamqa.com

Bharathi is right, we have to use "condensation pot"

# Actually the gas is "self venting" and the instrument
mounting should be above the pipeline in order to avoid
vapor condensation which cuase fault reading.

# For liquid service the instrument mounting should be
below the pipeline as the liquid is "self draining".

# If we want to mount the instrument below the pipeline in
gas service we should use "condensation pot" and the
operator should drain it regularly to avoid fault reading.

# In steam service we use the condensation pot also and it
should be fully filled with water and its mounting should
be in the same pipeline level and the instrument itself
will be below the pipeline, this link indicte the situation:

http://www.eng-tips.com/viewthread.cfm?qid=166893&page=97

the aim of water filling is to provide a solid motion
transfer in order to have a good accuracy.

Regards,

Ahmed Sabry
Control and Instrumentation Engineer
GPC - General Petroleum Company
CELL.: 00 2 0121367310

Answer / ravi

you can use the txe down, which measures level or flow, we
have to make impulse line downwards by taking flange
opening at the top of process line. we have to give steam
line over the entire impulse line, so that gas especially
LPG will not condense at atmospherice temp, and it will
give the correct pressure across the diaphram of DP, so
that correct level can be mearure.

Answer / hemant bhati

You can bring the Transmitter down side only when you
provide a diagram seal type of arrangement even there is
gas line.

Answer / snehal

place the taps side of the line
place the transmitter beside/above the line so that
condensed fluid will drain off

Answer / kk

transmitter taps should be greater than 45 from both taps

Answer / krishna

YOU CAN INSTALL TRANSMITTER DOWN SIDE SO THAT YOU SHOULD
MAKE IMPULSE LINES ACCORDING TO REQUIREMENT . TRANSMITTER
RANGE WILL CHANGE ACCORDING TO DISTANCE FROM TANK TO THE TX
LEVEL .OTHERWISE ERROR WILL ERAISE

Answer / bharathi

You can bring the impulse line as you want. But the only
thing is u should provide condensate pot at drain point. al
so provide steam trace over the impulse line. It will
avoided rate of condensate. If you install without this
condensate pot the transmitter reading starts fluctuate
frequently.

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