... Welding Flange, Blind Flange, Orifice Flange, Ring Joint Flanges, Long Welding Neck Flange, Figure 8 Blanks Standard, BS4504 SEC 3.1; welding ... loose plate flange(101), loose plate flange(102), loose plate with weld-neck flange (104), blink flange(105) Pressure Grade PN2.5 ... BS 4504(PART-1); welding neck flange, hubbed slip-on hubbed threaded, plate flange, loose plate with weld on plate collar flange ...