Smart Tee Model considerations in START-PROF

This article provides guidelines for modeling Tee or branch connections using Software START-PROF. The guideline covers modeling for both the Standard Tee and Non-Standard Tee Connection.

Modeling Standard Tee

When you create a standard tee in START-PROF, you can specify tee length (L), tee height (H), header wall thickness, and branch wall thickness.

Fabricated Tee Modeling in Start-Prof
Fabricated Tee Modeling in Start-Prof

When you run analysis simple tee model is automatically replaced by a complex model. Added 6 additional nodes (21, 2, 3, 4, 5, 20). Nodes are hidden for the user. It is visible only in developer mode.

  • 10-20 Element is rigid (H=Dh/2, Dh – header outer diameter)
  • 4-10 and 10-5 elements length is 1 mm (L=2mm)
  • 20-21 pipe element has a wall thickness specified in “Tee” dialog box Tb=10 mm. It can be thicker than the connected pipe
  • 4-3 & 5-2 pipe elements have a wall thickness specified in the “Tee” dialog box tn=10 mm. It can be thicker than the connected pipes
Smart Tee
Tee Connection in Start-Prof

Modeling Non-Standard Tee

For “Nonstandard Tee” and for any standard tee if ASME B31J code selected, additional run flexibilities added into nodes 4 & 5, and branch flexibilities added into node 20. Flexibilities calculated according to ASME B31J

Using ASME B31J Option in Start-Prof
Using ASME B31J Option in Start-Prof

If the option “Consider Tee Branch Flexibility” is selected, then 4 & 5 nodes are not created for standard tees. The flexibilities in node 20 calculated according to ASME BPV SIII div 1 class 1 NB 3686.

Considering Tee Branch Flexibility
Considering Tee Branch Flexibility

Few More Resources for you…

Piping Stress Analysis using Start-Prof
Piping Stress analysis Basics
Piping Stress Analysis using Caesar II
Piping Stress Analysis

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Alex Matveev

Alex Matveev is one of the authors of pipe stress analysis codes GOST 32388-2013 Process Piping, and GOST 55596-2013 District Heating Networks. He is also one of the developers of PASS/Start-Prof software, which is developed since 1965 and used in 95% of process, power, district heating, gas and oil transportation design companies in Russia and CIS countries; it is industry standard in that region. He is the head of the PASS/START-PROF pipe stress analysis software development team. Also, He offers technical support and training for users of their software that number already 3000+, developing since 1965, industry standard in several countries for 50+ years, translated into English in 2017, come out from their domestic market, and started sales for the international market since 2018.

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