Use of non-standard flanges: Non-standard flanges are mainly used for pipeline connections, and various non-standard flanges are installed on the pipelines to be connected. Non-standard flanges can be used in low-pressure pipelines, and non-standard flanges can be used for pressures above 4kg. Add gaskets between the two non-standard flanges and tighten them with bolts. The different bolts used mainly depend on the thickness of the non-standard flange under different pressures.
Material
Carbon steel
ASTM A105, A350 LF1, LF2, LF3, LF6, CL1/CL2,; A694 F52, F60, F65, F70; A516 Gr. 60, 70;
BS-EN 10222-2 P245GH, P280GH; EN10222-4 P355NH, P355QH; EN10273 P250GH, P265GH;
DIN 17243 C22.8; VD-TUEV350/3 C21; GB/T 1591 Q345B, Q420B; NB/T 47008 16Mn,20#;
BS 10250-2 S235J…