Donald Edwards

You'll need to re-phrase the question.

You might look at pressure loss of fittings.

Maybe Google, "equivalent length of pipe".

Assuming that you mean flow straight through an equal Tee, then use 20d (twenty times the nominal diameter of the pipe) as the equivalent length.

For axial flow through side exit and for side inlet and axial flow in both directions use 65d.

Note that in every book or paper that you look at it will be slightly different, but these are good approximations. (Especially as we do not know velocities, pipe condition, material etc).

One reference gives no loss coefficient for straight through flow and 1,3 and 0,7 for subdivision of flow for sharp edges and rounded with flat bottom respectively.

where p_v=loss coefficient x density x velocity²/2 (pressure loss in fittings or valves)