![]() ![]() ![]() Thick, hot formed heads can be OD ordered but require an extra manufacturing step. are custom made.) As heads get thicker, hot forming is necessary and dies are based on ID. ![]() thick or less, choosing ID or OD makes little difference, while most heads more than 36 in. For instance, after a purchase order is issued, heads are the first things ordered - obtaining off-the-shelf heads is more likely if specified by nominal pipe sizes (NPS), which is OD from diameters 14 in. However, sometimes specifying a vessel based on outside diameter (OD) is better. This also will simplify fabrication/installation of internal hardware (e.g., support rings, trays, distributors, etc.). Process engineers often specify a vessel’s diameter based on inside diameter (ID) to ease volumetric calculations. So, here, we’ll attempt to condense the 5,000+ pages (50+ lbs) of the ASME Boiler and Pressure Vessel Code, or “the Code,” as it’s affectionately known, into a simple guide when specifying vessels, heat exchangers and tanks. ![]() Smart choices can save you money during fabrication as well as over the lifecycle of the vessel. Yet, there’re as many choices within the ASME code as there are when searching for your next vehicle. “Just build it to the Code.” That’s the most common response you hear during a design review that involves purchasing a new pressure vessel. This article is the final part of a series on pointers for welded equipment (e.g., pressure vessels, heat exchangers and tanks). ![]()
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