For the blind flange, this is the final part of the connection type on the pipe. It is called a blind flange because the position of this flange is the last barrier to the pipe. So this section is used for blocking fluid flow, it can be said that the last channel in this section is a fairly vulnerable section.
Because this section will receive a high enough pressure from the initial position of the pipe originating or it can be said to be the last retainer.
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