Hypothetical Vessel Design

Example 7-1 Hypothetical vessel design, carbon steel grade A-285, Gr C 

Closest standard plate thickness to fabricate vessel is 0.50 in. with — 0.01 in. and 4- 0.02 in. tolerances at mill. 

Balaneid Disk and Vinted Piston Typi Billows Typ  

Back Pressure Has Very Little Effect on Set Pressure 

P2 Vent Line Back-pressure Fs = Force of Valve Spring An Nozzle Seat Area Ap= Piston Face Area Ab Bellows Area Aq= Valve Disc Area 

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The objective of this case study is to develop an ANN model for predicting the possibility of failure or defect of a given vessel. It is based on a hypothetical vessel s design features and the ship owner s management quality. 

During the past 45 years of peaceful use of nuclear energy, no case of a nuclear reactor pressure vessel rupture has occurred. This hypothetical event is not included in the design basis accidents (DBAs) nor, according to the most recent trends, among the severe accidents to be reasonably considered. This is not, as it will be discussed more extensively later, the only possible choice it, however, has been considered acceptable and practicable. 

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