ASME VIII Div.1

Appendix 1-5(g)(1)

In the 'Conical Section' output, we found that the discontinuity stresses are computed based on internal design pressure. We suggest, there should be an alternative option to calculate discontinuity stresses based on MAWP as the cone/shell junction is the critical part of the vessel.

Please comment.

Dear Jayaraj,

A typical component design may involve satisfying many requirements such as thickness due to hoop stress (from internal pressure), external pressure, and others such as discontinuity stress check for a cone-cylinder junction, area of reinforcement and strength of weld check for a nozzle. The MAWP due to hoop stress (internal pressure) is usually reported. In some cases, the MAWP calculation procedure is non-linear e.g. area of reinforcement check for a nozzle. There are other cases, in where due to the complexity involved, MAWP is not computed.

So, to make sure the component passes all the checks at MAWP, perform a second run in which enter the MAWP as the design pressure and check all the requirements.

Regards,
Mandeep Singh
COADE, Inc.


[This message has been edited by msingh (edited June 25, 2000).]