PN CLASS inches metric
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1. What do the numbers 150 and 300 represent for CLASS 150 and CLASS 300? 2. What are the methods for labeling PN series and CLASS series products? 3. What are the standards for converting inches to metric DN?
1. The numbers 150 and 300 represent the pressure rating of the valve or pipe fitting, that is, the maximum allowable operating pressure (in pounds per square inch, psi). 2. There is no direct correspondence between the PN series and the CLASS series, but they can be compared based on pressure rating. The specific method for marking the pressure rating requires reference to relevant industry standards or consultation of a pressure rating chart. 3. The conversion between inches and metric DN requires reference to the ANSI B36.10 and ANSI B36.19 standards, which specify the outer diameter and wall thickness of pipes of various sizes. Generally, 1 inch is approximately equal to 25 millimeters, and a preliminary conversion can be made using this ratio. .
GBT1047-2019 and GBT1048-2019 will give you the answer