I am reviewing some design blueprints for a plant expansion that has not yet been commissioned. Part of the design includes a non-integral superheater fed from a branch steam line. The piping to the superheater is marked non-boiler code, but the piping out of the superheater is marked boiler code until the first valve. I was under the impression that piping to and from a non-integral superheater was all non-boiler code. Why would the superheater outlet piping be considered boiler code? The engineering firm that did the design is no longer in business or I would ask them. Thanks in advance.
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