Piping
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Some write it as PN25, while others write it as PN2.5 – how can one tell the difference?
First, you need to confirm whether this is a level, as there are values of 2.5 as well as 25
See what the standard is – for a pressure of 2.5 MPa, some standards use PN2.5 while others use PN25. The old standards used megapascals, while the new nominal pressure standard is in bars
One is the standard from the Ministry of Machinery, and the other is the standard from the Ministry of Chemical Industry; it depends on which one you need to use