We Rio Engineering are Manufacturers and Exporters of Blind Flanges as per International Standard from Mumbai, Maharashtra, INDIA.

Contrary to all the flange types seen above, blind flanges do not have a center hole, and are used to blind or seal a pipeline, a valve/pressure vessel and block the flow of the fluid. Blind flanges have to withstand remarkable mechanical stress due to the system pressure and the required bolting forces.

Blind flanges allow easy access to the pipeline, as blind flanges can be easily unbolted to let the operator execute activities inside the terminal end of the pipe (this is also the reason why the blind flange type is used as a manhole for pressure vessels, at times). It is maybe interesting to observe that, while this blind flanges type is easier to manufacture, blind flanges are sold at a premium average cost per kilogram compared to the other flange types.

Blind Flanges are manufactured without a bore and used to blank off the ends of piping, valves, and pressure vessel openings.

From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types.

However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these blind flanges are suitable for higher pressure temperature applications.

Blind Flange Dimensions

During a dimensional inspection of the flange, you should check for

• Outer Diameter of body
• Bolt Circle & Bolt hole Diameter
• Straightness and alignment of the bolt hole
• The thickness of the Blind

Class 150 Blind Flanges Dimensions

Class 300 Blind Flanges Dimensions

Class 400 Blind Flanges Dimensions

Class 600 Blind Flanges Dimensions

Class 900 Blind Flanges Dimensions

Class 1500 Blind Flanges Dimensions

Class 2500 Blind Flanges Dimensions

Disclaimer – Please check with ASME B16.5 before using it.