I am designing a piping system for a hydraulic power unit (HPU). One leg consists of 3" S160 piping operating at 3,195 psi. Another is comprised of 1 1/2" XXS piping operating at 4,150 psi. Both legs incorporate A106 Gr. B pipe with full penetration butt-welded fittings (i.e. elbows, tees, caps...