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A purchase order specifies a stainless steel weld neck flange: NPS 2, Class 150, raised face. The supplier still asks for the pipe schedule. Why is that information missing from an apparently complete description?
Choosing between a blind flange and a pipe cap starts with the connection already on the line. A spare pump nozzle may have a flange. A new pipe spool may end in plain pipe. Both need a closure, but they do not need the same part.
Pickling and passivation address different surface problems on stainless steel flanges. One batch may arrive with dark scale from heat treatment. Another may look clean but carry iron transferred during machining or handling.
Flange bolt hole orientation determines where the holes sit around the bore once the flange is fixed in place. Two stainless steel flanges can share the same bolt circle, hole count and hole diameter, yet still refuse to bolt together.
Are stainless steel flanges magnetic? Some are, and a magnet can also attract certain flanges made from nominally non-magnetic grades.
Your order specifies F316L stainless steel flanges. The quotation offers F316/F316L. Does the additional grade indicate an acceptable supply option, a material substitution, or simply an unclear description?
