Flanges

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Blind Flanges

Blind Flange produced in our Mumbai factory, carries a promise of quality and consistency. Sotco India continues to meet customers’ needs through global quality standards from original design to distribution. Sotco India manufactures to global standards. We are one of the leading importer, stockholder, suppliers & exporters dealing in Blind Flange since 1990. When procuring raw materials to manufacture Blind Flange, our primary responsibility is to ensure that same quality and consistency exists in our supply base.

Blind flange (blind flange) also called blind plate, not the middle hole of the flange, sealed pipe plug for use. Sealing surface in the form of more types, there are flat, convex, concave and convex surfaces, tongue and groove, ring joint face.

Excel Metal is excellently equipped for the production of tailor-made, high-grade flanges. In our forging shop, an advanced, automatically controlled steel bar furnace with a length of over 12 m heats the raw material up to approx. 1,100°C before rings or flanges with an outside diameter of up to 2,800 mm are formed using our face plate bending machine.

 

Blind Flange Dimensions and Tolerances

NPS 1/2
Class 150 300 400 600 900 1500 2500
Diameter - D 90 95 95 95 120 120 135
Height - B 9.6 12.7 14.3 14.3 22.3 22.3 30.2
11.2 14.3 20.7 20.7 28.7 28.7 36.6
Diameter - G 35.1 35.1 35.1 35.1 35.1 35.1 35.1
Diameter - K 60.3 66.7 66.7 66.7 82.6 82.6 88.9
Bolt Holes 4 4 4 4 4 4 4
Diameter - L 15.9 15.9 15.9 15.9 22.2 22.2 22.2
Stud Bolts Diameter x Length
Diameter (in) 1/2 1/2 1/2 1/2 3/4 3/4 3/4
Length (mm) 55 65 75 75 110 110 120

 

Dimensional Tolerances of Blind Flanges ASME B16.5

Outside Diameter
≤ 24 = 1.6 mm | > 24 = ± 3.2 mm
Inside Diameter
not applicable
Diameter of Contact Face
1.6 mm Raised Face = ± 0.8 mm
6.35 mm Raised Face, Tongue & Groove / Male-Female = ± 0.4 mm
Outside Diameter of Hub
≤ 12 = + 2.4 mm / - 1.6 mm | ≥ 14 = ± 3.2 mm
Diameter of Counterbore
not applicable
Drilling
Bolt Circle = 1.6 mm | Bolt Hole Spacing = ± 0.8 mm
Eccentricity of Bolt Circle with Respect to Facing
≤ 2½ = 0.8 mm max. | ≥ 3 = 1.6 mm max.
Thickness
≤ 18 = + 3.2 mm / - 0 | ≥ 20 = + 4.8 mm / - 0
Length thru Hub
≤ 18 = + 3.2 mm / - 0.8 mm | ≥ 20 = + 4.8 mm / - 1.6 mm

Notes
1. Dimensions are in millimeters unless otherwise indicated.
2. The length of the stud bolt does not include the height of the chamfers (points).

 

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