# Boiler Header stress calculation problem

The header in the boiler always has more than10 tubes connected to it at one point，but now the autopipe just can create one node at one node.So how to creat more than10 tubes at one node？Or how to calculate the Panel stress for the boiler.

Parents
• Hi mike:
I am a new user for  the AutoPipe.  So I know it a little. I have two questions as below:
1:What is the user SIF?  Is it a coefficient? How to specify  it ,I see there are so many option for it, which one should be choose?

2: I do not specify a user SIF， I  creat a  node A139 and then  try to creat all the followed node  connect to it  by change the  origin point, but they do not connect to A139,they still connect by sequence.
3:The tube for the boiler header will be a circle as followed picture, is the available?

Best Regards.
• Hi mike:
I am a new user for  the AutoPipe.  So I know it a little. I have two questions as below:
1:What is the user SIF?  Is it a coefficient? How to specify  it ,I see there are so many option for it, which one should be choose?

2: I do not specify a user SIF， I  creat a  node A139 and then  try to creat all the followed node  connect to it  by change the  origin point, but they do not connect to A139,they still connect by sequence.
3:The tube for the boiler header will be a circle as followed picture, is the available?

Best Regards.
Children
• Greetings,

1:What is the user SIF?  Is it a coefficient? How to specify  it ,I see there are so many option for it, which one should be choose?
A user SIF is a user defined SIF value. If the user wants to override an automatic SIF value with their own. If the junction is outside of the automated SIF calculations user should specific their own SIF value.
There are a number of ribbon commands to specify an SIF, with a model opened in the program, click on the binoculars icon in the top right corner of the application screen, then on the "command search utility" that appears, type in SIF and select a line with "Joint Type and User SIF". Select help on this dialog to see details about this feature.

2: I do not specify a user SIF，I  created a  node A139 and then try to create all the followed node  connect to it  by change the  origin point, but they do not connect to A139,they still connect by sequence.