A seamless blank unstayed dished head with pressure on theconcave side has a diameter of 1,016mm and is a segment of a spherewith a dish radius of 889 mm, The thickness of the dished head is25.4mm. The maximum allowable stress value of dished- head material(carbon steel, SA- 285- A) is 88.9 MPa, which has an operatingtemperature of no more than 250 C. Determine the maximum allowableworking pressure of the blank unstayed dished head.
