Thanks for replying.
Let me share some process data:
– Piping diameter: 8″. Distance: about 50 m
– COT= 491°C
– Temp. measurement next to furnace and drum inlet
That being said, we are seeing between 27 and 35 °F. Line is completely isolated and this temperature drop has been constant in the last 5 years. But I wanted to understand a little bit more the nature of this drop and to make like a benchmark with other refineries.