I was referencing ASTM 403A, and noticed the designations "WP", and "CR". From past posts I found that "WP" stands for "Welded Pipe". I was unable to find a definition for "CR". What does "CR" mean? What are the differences between WP and CR? From what I could tell, it is the hydrostatic testing methods, and dimension standards that are different. Are there other differences, what about advantages/disadvantages between the two? Any help would be appreciated.
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