Abstract: At the beginning of a project, setting an allowable external load value related to the static equipment nozzle size and pressure level can facilitate the separate work of the equipment and piping stress engineers, thereby greatly accelerating the project progress. However, some problems often arise in the setting and use of the allowable external load values of nozzles and in the process of verification and calculation of values exceeding the specified value. Thispaper elaborates on these issues in the hope of helping designers avoid over-design while ensuring the safety of the designed products.

Key words: allowableexternal load of nozzle, local stress, static equipment