CNIS GB/T 9115.25-88 Steel pipe welding neck flanges with tongue and groove face for PN 2.5MPa (25 b... CNIS GB/T 9116.4-88 Hubbed slip-on-welding steel pipe flanges with raised face for PN 1.0MPa (10 ba... CNIS GB/T 9119.6-88 Slip-on welding plate steel pipe flanges with raised face for PN 0.6MPa (6 bar) CNIS GB/T 9113.22-88 Interal steel pipe flanges with ring-joint face for PN 5.0MPa(50bar) CNIS GB/T 9118.5-88 Loose hubbed steel pipe flanges with welding neck collar with ring-joint face f... CNIS GB/T 9116.25-88 Hubbed slip-on-welding steel pipe flanges with ring-joint face foR PN 25.0MPa (... CNIS GB/T 9123.27-88 Steel pipe blank flanges with tongue and groove face for PN 5.0MPa (50 bar) CNIS GB/T 9123.29-88 Steel pipe blank flanges with tongue and groove face for PN 15.0MPa (150 bar) CNIS GB/T 9119.7-88 Slip-on welding plate steel pipe flanges with raised face for PN 1.0MPa (10 bar... CNIS GB/T 9113.25-88 Integral steel pipe flanges with ring-joint face for PN 25.0MPa (250 bar) CNIS GB/T 9115.36-88 Steel pipe welding neck flanges with ring-joint face for PN 420MPa (420 bar) CNIS GB/T 9115.12-88 Steel pipe welding neck flanges with raised face for PN 2.0MPa (20 bar) CNIS GB/T 9119.1-88 Slipon welding plate steel pipe flanges with flat face for PN 0.25MPa (2.5 bar) CNIS GB/T 9123.8-88 Steel pipe blank flanges with raised face for PN 1.0MPa (10 bar) CNIS GB/T 9115.26-88 Steel pipe welding neck flanges with tongue and groove face for PN 4.0MPa (40 b... CNIS GB/T 9116.7-88 Hubbed slip-on-welding steel pipe flanges with raised face for PN 4.0MPa (40 ba... CNIS GB/T 9113.7-88 Integral steel pipe flanges with raised face for PN5.0 MPa (50 bar) CNIS GB/T 9121.2-88 Loose plate steel pipe flanges with weld-on collar with raised face for PN 1.0M... CNIS GB/T 9118.8-88 Loose hubbed steel pipe flanges with welding neck collar with ring-joint face f... CNIS GB/T 9115.27-88 Steel pipe welding neck flanges with tongue and groove face for PN 5.0MP (50 ba... CNIS GB/T 9113.14-88 Integral steel pipe flanges with male and female face for PN 15.0 MPa (150 bar) CNIS GB/T 9128.1-88 Octagonal metallic ring gaskets for steel pipe flanges joints CNIS GB/T 9123.25-88 Steel pipe blank flanges with tonges and groove face for PN 2.5MPa (25 bar) CNIS GB/T 9113.19-88 Integral steel pipe flanges with tongue and groove face for PN 5.0 MPa (50 bar)