whats the differece between x42 pipe and x52 pipe
PSL1 Vs. PSL2 Differences Steel Pipe, Steel Tube, Steel PSL1 Vs. PSL2 Differences. The American Petroleum Institute (API) designates different specifications on selling line pipe. The two specs under API 5L are PSL1 and PSL2. These specs cover seamless and welded steel line pipe from grades X42 through X80.