Can a loose-flange only be connected to another loose-flange?
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Taking the connection of the pipe ends in an enamel-lined kettle as an example, the pipe ends of such equipment are all equipped with slip flanges; can PL flanges be used for the flanges of the connected pipes?
For the mating flanges, one is loose-fitting, while the other can be chosen arbitrarily
That is to say, as long as the pressure rating is the same and the sealing surfaces match, they can be connected, right?