Flanges are welded in the form of PL, SO, WN. What do you mean?
In accordance with the provisions of the HG20592, the flange code significance is as follows:PL welding plate flange with flange, SO diameter, WN butt welding neck flange;IF integral flanges, SW Socket Weld flanges, TH threaded flanges;PJ/SE ring loose flange butt welding, PJ/RJ welding ring flanges;BL flange cover, BL (S) lined flange cover
PL welding plate flange, SO with diameter WN welding neck flange;
PL welding plate flange,SO with diameter flange,WN butt welding flange;IF integral flange,SW socket welding flange,TH threaded flange;PJ/SE welding ring loose flange,PJ/RJ flat ring loose flange;BL flange cap,BL (S) lined flange cap
