Flange PL40 (B)What does PL40 mean in flange PL40 (B) -1.6RF304HG20593-97?
PL 'flat welding flange 40 nominal diameter DN40
RF refers to the sealing surface of the flange for the projection type; 1.6 is nominal pressure 1.6MPa; 304 is the flange material. The latest standard is HG/T 20592-2009, steel pipe flanges, gaskets and solid parts, instead of HG20592~20635-1997.
HG20592-97 is the Ministry of chemical industry standard "welding flange plate steel pipe flanges" (European system), PL refers to the type of flange welding plate flange, (B) refers to the application of the pipe diameter B series (Metric), flange diameter DN40 nominal diameter is 46mm, with a 45mm diameter steel pipe.
