ASME/ANSI B16.47 Series B-API 900 Class Blind Flange/Standards, Dimensions & Weight

Blind Flange is flanges that designed to be joined to a piping system by butt welding. This kind of flange include lots of specification, weld neck flange is expensive because of its long neck and cost of people for contact Blind flange with pipeline or fitting, but is preferred for high stress applications. The necks, or hubs, transmits stresses to the pipeline. The gradual transition of thickness from the base of the hub to the wall thickness at the butt weld provides important reinforcement of the blind flange. The bore of Blind flange matches bore of the pipeline, reducing turbulence and erosion.

  • Our company is a manufacturer of ASME/ANSI B16.47 Series B-API Blind Flange, which is precisely engineered in accordance with international quality standards. For detailed dimensions of 900 Class Blind flange, kindly check the table below. Also, you can download the datasheet.
900 Class Blind Flange Drawing ASME/ANSI B16.47
Product Blind Flange
Pressure Rating 900 lb, 900 Class
Dimensional Specification ASME/ANSI B16.47
Size 26″ to 60″
Surface Treatment Anti-rust Oil, Paint, Zinc, Hot Dipped Galvanized
Grades 304, 304L, 316L, 321, 347, 904L, Duplex, Carbon Steel, Nickel Alloys
Test Certificates As per EN 10204 3.1
Inspection Videos, Pictures, Inspection Report with Goods
Pipe Normal Diam. O.D.
OF
Flange		 Thickness Raised
Face
Diam.		 Diam. of
Bolt
Circle		 No. of
Bolt
Holes		 Diam. of
Bolt
Holes		 Diam. of
Bolt		 Fillet
Radius
Min.
inch O C R BD BN BH DB r1
26″ 1022.4 153.9 762 901.7 20 66.5 2 1/2 11.2
28″ 1104.9 166.6 819.2 971.6 20 73.2 2 3/4 12.7
30″ 1181.1 176 876.3 1035.1 20 79.2 3 12.7
32″ 1238.3 185.7 927.1 1092.2 20 79.2 3 12.7
34″ 1314.5 195.1 990.6 1155.7 20 85.9 3 1/4 14.2
36″ 1346.2 201.7 1028.7 1200.2 24 79.2 3 14.2
38″ Size 38″ through 60″ are identical to series A, Class 900 flanges.
40″
42″
44″
46″
48″
50″
52″
54″
56″
58″
60″