What is loop or pigtail in an impulse line?
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Answer Posted / suresh m (fcri)
Loop/Pigtail helps provide for tube expansion due to
temperature changes. If tube is straight and directly
inserts into the pressure transmitter (which is also
rigidly fixed to a support), there will be streses in tube
due to expansion/contractions.
In steam applications, impulse tubes are to drain
condensate back into process line and transmitter is fixed
generally above process line. The same with gas
applications. For liquid applications, the impulse tube
slopes to eliminate gas formation inside which escapes back
to process line.
In both cases, the pigtail/loop will therefore have to be
appropriately directed (either upward or downward
respectively, even as slope is maintained for impulse
lines).
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