How do I model a pipe that has a four way intersection. Meaning one pipe is going North to South and then another pipe intersecting going East to West like a '+'

This is not a 'tee' function.

Search for "cross"

Try here:
http://www.pennusa.com/pennpage/directory/reducefitting.html

In absence of clear guidelines of SIF for cross, C-II does not define SIF for same. Unless derived by FEM, one may define two seperate SIF by just off setting branch by 1mm element.

Pradeep,
UNderstand that SIF for cross is not covered anywhere and manual calculation is needed.
However I still don't know how to model it on CII can you explain further on what you meant by 'off setting branch by 1mm element. '

Try this,

1. Element 10-20
DX = 300 mm .......Define SIF at 20..WELDING/UNREINFORCED.

2. Element 20-40
DZ = 300 mm

3.Element 20-25
DX = 1 mm........Define SIF at 25..WELDING/UNREINFORCED.

4.Element 25-30
DX = 300 mm

5. Element 25-50
DZ = -300 mm

Nodes 20 & 25 are offset by 1 mm and at both the location normal Tee SIF is defined.

If you find better method than this latter on then please post here for the benefit of group.

Pradeepd's suggestion will give you a decent structural model of the cross, but it will not deal with the sif issue.

If the 'branches' are small in comparison to the header, I would contend that the relevant sif for a comparable tee appleid to each 'branch' would be appropriate. However if the 'branches' are anything like the header size, such that a bending load on one branch affects the other one, then you will need FE to get an sif.

You might visualise an FE plot of the loaded component ... if contour lines from one branch affects the other branch ... like affecting the 'back' of a normal three leg tee, then it's complex.