43 CFR § 3175.41
Flange-tapped orifice plates
June 11, 2020
Flange-tapped orifice plates that are constructed, installed, operated, and maintained in accordance with the standards in §3175.80 are approved for use.
Flange-tapped orifice plates that are constructed, installed, operated, and maintained in accordance with the standards in §3175.80 are approved for use.