Hubbed flange 2 "ANSI #150 is what size?
2 "ANSI #150" means a two inch valve (that is, metric DN50) with a rating of Class150 and approximately equivalent to the metric PN25.
ANSI B16.5 American Standard looper flange class pressure level
2 refers to the nominal diameter, corresponding to DN50150 refers to nominal pressure, equivalent to PN20
The flange under ANSI gauge dimensions is the flange listed in ASME B16.5. 2 "represents the nominal diameter of 2 inches, refers to the flange welding end pipe, the outer diameter is 2", that is, 60.3mm, approximately equal to the metric size of DN50, but not exactly the same. #150 indicates that nominal pressure is class150, and that is 2.5MPa, which is equivalent to PN25 in HG/T20615-2009. However, in the ASME series, metric dimensions are required in metric sizes, and the inch sizes are in English. In principle, the two can not be used in combination. That is to say, 2 inch flanges and DN50 can not be connected together in principle.
