What is the difference between PLS1 and PLS2 on 9711?
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What is the difference between PLS1 and PLS2 on 9711?
API Spec 5L specifies only a lower limit for the yield strength requirement of PSL1 steel pipes, with no upper limit specified; whereas PSL2 steel pipes have both a lower and an upper limit for their yield strength requirements； PSL1 steel pipes do not have specified requirements for Charpy impact toughness, while PSL2 steel pipes have specified requirements for both Charpy impact toughness and the SA% value of the DWT test for pipes with a diameter of D≥508 mm. Requirements for yield strength and tensile strength in tension testing of PSL1 and PSL2 steel pipes.
For the pipeline section in gas transmission projects, the steel pipes generally chosen are welded steel pipes of the PSL2 series as specified in GB/T9711—2011.
PLS1 and PLS2 are position switches used to set different signal input positions. PLS1 is usually set at a lower position point to initiate an action, while PLS2 is set at a higher position point to terminate or change that action. The specific settings and functions may vary depending on the design of the actual device. .