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When modeling a Tee, install the Tee Flow Thru Branch in the branching line. With regard to installing the Tee Flow Thru Run, you have the following options:
1) Install the Tee Flow Thru Run in both the upstream and downstream pipelines (this is a very conservative approach).
2) If you only want to install the Flow Thru Run in one pipeline, install it in the pipeline that has the larger flow rate. For example, if you know that the flow enters the Tee from the branch pipeline and the upstream pipeline, and that the combined flow exits through the downstream pipeline, install the Flow Thru Run in the downstream pipeline.
3) Choose a pipeline (upstream or downstream) that you always install the
Flow Thru Run fitting in, then consistently follow that procedure throughout the system.
4) Ignore the Flow Thru Run losses and only install the Tee Flow Thru Branch fitting (this is the least conservative approach). Some of our users elect to use this approach since the branching loss is the most significant.
As you can see, there are several different approaches to modeling the Flow Thru Run effects of tees. The approach you decide to use is up to your preference and engineering judgment.
A note of caution - if you install both a Tee Flow Thru Run and Tee Flow Thru Branch to model one Tee fitting, the Bill of Materials Report will include an extra Tee. If you want to include the effect of both the Flow Thru Run and Branch, as well as have the correct count of Tees in the Bill of Materials, you can do the following: In the pipeline in which you want to install the Tee Flow Thru Run, click on the Tee Flow Thru Run fitting in the list of available fittings, but do not actually install it. Instead, note the K value and then install a Fixed K fitting using this K value. The Bill of Materials Report will then have the correct number of Tees and you will fully account for the Tee loss.
