开孔袋开孔补强英文版.docx

UG-35 OTHER TYPES OF CLOSURES UG- Spherically Dished Covers Requirements for design of circular spherically dished heads with bolting ranges are given in l-6 UG- Quick-Actuating (Quick-Opening) Closures LIG-(a) Definitions UG-(a) (1) Quick-actuating or quick-opening closures are those that permit substantially faster access to the contents space ofa pressure vessel than would be expected with a standard bolted flange connection(bolting through one or both flanges). Closures with swing bolts are not considered quick-actuating (quick- opening). UG-(a) (2) Holding elements are structural members of the closure used to attach or hold the cover to the vessel. UG-(a)(3) ponents are structural items that are used to prevent opening of the closure while pressure is applied. ponents may also be used as holding elements. UG-(a) (4) The locking mechanism or locking device consists bination of ponents. UG-(b) General Design Requirements UG-(b) (1) Quick-actuating closures shall be designed, such that the failure ofa single ponent while the vessel is operating, will not: (a) release the cover; (b) result in the failure of any other ponent or holding element; (c) increase the stress in any other ponent or holding element 6y more than 50% above the allowable stress of ponent. UG-(b)(2) Quick-actuating closures shall be designed and installed such that i