The process reasoning is covered well by 25362. However, other reasons are based on eceonomics: eg. a very tall vessel is less ecomomical to build than a horizontal vessel; because of the civil fdn etc and wind loads.
On the otherhand if a smaller vessel is installed horizontally, it requires a...
To Answer your Q:
You have got most of the answers, just one more addition; if you are firing fuel that makes soot, then you will have soot coming out of the casing and it is nusiance and health hazard; the place will have soot all over. Sometimes you may like to run the convection section...
There are velocity criteria for tubes and they are as follows:
CS tubes: Velocity between 3 ft/sec to max 6 ft/sec
SS tubes: Max 15ft/sec (fresh water)
Cu Ni tubes: 10 ft/sec
Adm Brass: 5 ft/sec
The lower limit would be 3 ft/sec in all cases, below this velocity fouling frequency would...
Seems like you have a problem associated only with inst reading using fuel gas.
Q1: What is the flow rate of this gas in the instrument lines that you need to read instruments off. Are these lines dead ended or there is some purge and if so, how much (scfm)?
Q2: Your analysis does not show...
