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PSL-1 is a loose normal high quality for line [Steel Pipe Projects For Constructions](https://www.steelpipeseller.com/projects/ "Steel Pipe Projects For Constructions"), whereas PSL-2 accommodates further testing requirement, stricter chemical physicals, together with different ceiling limits of mechanical properties, and require Charpy affect testing situations.
Long elbows are used in low-stress gravity-fed techniques and different purposes where low turbulence and minimum deposition of entrained solids are of concern.
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