Nozzles and flanges are critical pressure vessel components that provide connection points for piping, instrumentation, and access.
Nozzles are cylindrical extensions welded to vessel shells that provide openings for fluid transfer, instrumentation, or access. Flanges are flat, circular discs with bolt holes that connect nozzles to piping systems, creating sealed, pressure-tight joints. Together they form the primary interface between pressure vessels and external systems.
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A nozzle is the welded attachment to the vessel shell that creates an opening, while a flange is the bolted connection component that mates with piping flanges. The nozzle provides structural integrity, while the flange provides the sealing surface.
Nozzles are reinforced using pad plates, thicker shell sections, or integrally forged designs to compensate for material removed from the pressure boundary and manage stress concentrations at the opening.
Spiral wound gaskets (SS with graphite/filler), ring joint gaskets (oval/octagonal), and flat gaskets (non-asbestos) are commonly used, selected based on pressure, temperature, and fluid compatibility.
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