More to Quick-Opening Closures than Meets the Eye

July 2017, Vol. 244, No. 7

The common definition of a closure is a pressure-containing component used to blank off an opening nozzle on a vessel or end of pipeline. Under this definition, a closure could be: • Weld cap (flat, ellipsoidal, spherical, conical) • Bolted blind flange • Quick opening closure As defined by ASME B31.4 and ASME B31.8 a quick-opening closure is a pressure-containing component used for repeated access to the interior of a piping system. As defined by ASME VIII-1 UG-35.2 (a) (1): Quick-actuating or quick-opening closures are those that permit substantially faster access to the contents space…

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