A blind flange is a solid disc used to block off a pipeline or create a stop. It has no openings and can be inserted between two open flanges to block the flow of liquid. It is used for repairs, adding new lines, and closing a line. It is cheaper than valves and can be incorporated into the final length of a pipeline. The use of flanged pipes has made building and repairing pipes easier and faster. A universal design allows any pipe flange to be used in any pipeline.
A blind flange is a solid disc used to block off a pipeline or to create a stop. It is machined the same way as a regular flange with the mounting holes around the perimeter and the gasket grommets machined into the mating surface. The difference is that a blind flange has no openings to allow fluid to pass through. The blind flange can be inserted between two open flanges and used to block the flow of liquid through a pipeline.
Often a blind flange is inserted into a pipeline when a repair is needed further up the line. This allows downstream flanges to be disconnected without fear of liquid leakage. Many times this type of block is used when adding another line on an existing pipeline or when adding a new valve. This block is also used to close a line when it is no longer needed.
Without the blind flange it would be difficult to maintain or repair a pipe. Flow would have to be shut off at the nearest valve, which could be miles away from the repair area. The valves are also very expensive and tend to stick. The blind flange is a much cheaper way to seal a pipe.
When pipeline is being constructed, a blind flange is often incorporated into the final length of the pipe. This design allows for expansion or continuation of the pipeline by simply adding on the end flange. This also applies to adding tees at the construction site. A tee can be installed and then clamped off to leave the option of running a pipe later.
The use of flanged pipes made it possible to build pipes much faster than traditional welded pipes. It has also made the task of repairing and replacing sections an easier job. Pipe sections can now be assembled anywhere in the world and shipped to the job site. Once there, they can simply be bolted into place and the pipeline can resume carrying its liquid cargo.
Using a universal design, any pipe flange in the world can be used in any pipeline as long as the correct diameter is selected. This allows for emergency repairs with locally manufactured parts and eliminates the need to ship special parts around the world.
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