AlexRG
Mechanical
- Jul 6, 2006
- 18
I am working on the design of a vessel that has torispherical heads and im having a litlle trouble about it. With a design load of 15 psi the calculated head thickness is around 5/16". This was calculated using the general vessel formulas from table 2-1 of the Pressure Vessel Design Manual by Dennis Moss. the procedure 2-4 of same manual studies the stress at four points of the head . If I use the equations for the stresses in the knuckle I get 4000 psi and 56000 psi in the two directions. If the design temp. its 310ºf for SA-36 steel sheets, the allowable stress its 16700 psi. Then i have to increase the thickness of the head up to 3/4" to be ok. its this equation or guideline stipulated in the ASME CODE??. Im doing it all right ??. the internal Diameter of the vessel its 4000 mm. with a L/r = 16 2/3.