Posted by: rakesh sharma
WRC related problem. - 03/12/09 11:38 PM
Hellow Experts,
please tell me when to do WRC in CEASER II and what is the formula behind WRC.
Please tell me when to use WRC 107 & WRC 297.
Im the beginer....
Regards,
Rakesh
Posted by: RK
Re: WRC related problem. - 03/13/09 12:12 AM
Hello Rakesh,
As per best of my knowledge WRC-107 is used for design of vessel nozzles & attachments. It covers both spherical & cylindrical vessels. While WRC-297 specially applicable to cylindrical nozzles in cylindrical vessels. It gives data for large D/T ratio than WRC-107. In WRC-107 there is no seperate membrain stress intensity is given. while in WRC-297 emphasizes on the seperation of membrane stress.
for more detail I would reccomend you to use the PVRC(pressure vessel research commity) guidelines.
Posted by: RK
Re: WRC related problem. - 03/13/09 12:14 AM
Before using it in Ceaser you should know the basic thing behind it. It will always better that you should first read the guidlines and then check in the computer software.
Posted by: anindya stress
Re: WRC related problem. - 03/15/09 10:26 AM
WRC bulletins 107 and 297 ( by the way the full form of WRC is welding research council) addresses local stresses at vessel -nozzle interesection.WRC 107 is for cylindrical as well as spherical vessels and WRC 297 is only for cylindrical vessels. Both the bulletins discuss how to calculate membrane and bending stress intensities at different locations along the joint.These stress intensities are used as per rules of ASME SEC VIII DIV 2.WRC 297 additionally provides local flexibilities also.
For the formulas: read WRC 107 and 297.
For the basics: Basis method behind Caesar II is finite element analysis using beam elements.Basic method behind WRC 107/297 requires an understanding of shell/plate theory and good command over differential equations.
Based on the type of questions ( most of them)that we get to see in the forum these days and the absolute lack of interest ( this is based on my personal experience of trying to "teach" some young engineers who feels that spending time to brush up the fundamentals or improve knowledge base is a wastage of time)on part of most young engineers, I think my suggestions on "for the basics" will fall to deaf ears.
Regards