In carbon steel HVAC piping, 150 PSI is the typical hydrostatic test pressure. Smaller sizes aren't a problem, but when you get to 14" and up the max test pressures get below 150PSI.
Have any of you read this bulletin from NCPWB (see link below)? Any opinions on this?
Link
I checked a handful of ASTM A53B & A106B mill test reports and about half did not comply with the manganese to carbon ratio of 5+. Also, I didn't see "grain size" anywhere on the MTR's.
Also curious...
