Gas flow measurement in large stacks
Gas flow measurement in large stacks
(OP)
Hi everybody,
have anybody any experience on combustion flue gas flow measurement in large stacks?
Large means 40m. with 5m. diameters + 50m. with 4m. diameter. Total 90 m.
Flow is about 100.000 SCFM at 700°F.
I'm oriented on S-type pitot tube as claimed by the EPA code (mot mandatory in my case).
But I'm not sure about the accuracy and repetability I can get.
Another problem is the location, in order to meet the 5 diam. straight run upstream and downstream the only suitable place is 64m. height (!!). Of course the maintenance dpt. is not happy.
Suggestion/Improvements?
Thanks.
have anybody any experience on combustion flue gas flow measurement in large stacks?
Large means 40m. with 5m. diameters + 50m. with 4m. diameter. Total 90 m.
Flow is about 100.000 SCFM at 700°F.
I'm oriented on S-type pitot tube as claimed by the EPA code (mot mandatory in my case).
But I'm not sure about the accuracy and repetability I can get.
Another problem is the location, in order to meet the 5 diam. straight run upstream and downstream the only suitable place is 64m. height (!!). Of course the maintenance dpt. is not happy.
Suggestion/Improvements?
Thanks.





RE: Gas flow measurement in large stacks
Since your pipe diameter is so large, I would use one with both ends supported. Then gather the signal with a draft-range D/P transmitter.
RE: Gas flow measurement in large stacks