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ASTM A105N Carbon Steel Blind Flange ASME / ANSI B16.5

What is a Blind Flange,what about its specification and its advantages.

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What is a Blind Flange?

The blind flange is basically a flange that does not have a hub or a bored center. Blind flanges have the face thickness of a flange, a matching face type, and similar bolting pattern. Blind flanges can also be used to seal a nozzle opening on a pressure vessel.Similar to a regular flange, a blind flange has mounting holes around the perimeter and the gasket sealing rings are machined into the mating surface. The difference is that a blind flange has no opening for fluids to pass through

Specification of Blind Flange

Sealing Face RF, FF, FTJ
Size Range 1/2” – 48” / DN15 – DN1200
Pressure Rating Class 150, 300, 600, 900, 1500, 2500lb
Standard ASME / ANSI B16.5, ASME B16.47 Series A/B
Carbon Steel ASTM A105 / A105N
Low Temp Carbon Steel ASTM A350 LF2/LF3
Pipeline Steel ASTM A694 F42 / 46 / 56 / 60 / 65
Alloy Steel ASTM A182 F11 / 12 / 5 / 9 / 91 / 92
Stainless Steel ASTM A182 F304/304L/304H, 316/316L, 310S, 317,347,904

Advantages of a Blind Flange

1.First of all, a reasonable mechanical design structure can help us reduce the pressure and wear between the flange surfaces;

2.In addition, the material and heat treatment process of blind plate also affect the overall quality of the flange;

3.Furthermore, if the blind flange is working in a dusty or polluted environment, the necessary dust-proof devices and sealing devices should be added


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