Reactor, Column, and Transfer Piping Flange Supply

Reactors, distillation columns, and transfer piping define the petrochemical flange list. Class 150 and 300 dominate utility and lower temperature service. Class 600 through 1500 weld necks handle high temperature transfer lines and reactor feed where pressure and temperature stack against the joint.

Material selection swings between A105 carbon for benign streams, F22 and F91 chrome-moly for hot hydrocarbon service, and F304L and F316L stainless for corrosive feedstocks and intermediates. The plant turnaround calendar drives demand spikes that reward a supplier who pulls from stock rather than promising a mill rolling.

Traceability is non-negotiable. Every flange ships with mill test reports tied to heat numbers, and PMI confirmation on alloy grades is routine before any joint goes into a high pressure service file. Forged construction covers the high pressure work, while plate-cut comes in at lower pressure utility tie-ins and AWWA-style cooling water connections.