lol
6" straight copper tubes,3 ea in 1/4, 3/8, and 1/2"CTS, smooth, moderate dent, Big dent
the problem is that with a (pseudo) venturi the pressure recovery is high even with substantial restriction
test setups are:
1) cross/CTS adapter -> connecting tube -> test tube -> connecting tube -> CTS adapter/cross
and
2) CTS tube of relevant size with a 1/8" tap in sidewall -> connecting tube -> test tube -> connecting tube -> CTS tube w/tap
flow rates from 0.3 to 4.0 gpm
have not yet plotted the data, will be interesting to see how well the 2 'pressure tap' methods compare
(god I wish this stuff was automated, 3 more weeks perhaps)
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