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On fitting/s directly connected to a sprinkler: When could the fitting/s be neglected in the calculation of pipe friction loss?

Question asked by rick.nunez.3000 on May 15, 2020
Latest reply on May 16, 2020 by jmrivera

Reference: NFPA 13 (2019 Edition)

27.2.4.8 Friction Loss

27.2.4.8.1 Pipe friction loss shall be calculated in accordance with the Hazen–Williams formula with C values from Table 27.2.4.8.1, as follows:

(9) Friction loss shall be excluded for the fitting directly connected to a sprinkler.

 

What does "directly connected" to a sprinkler means? Suppose, a reducer-couple + a short riser nipple is attached to a tee in a branchline from which a sprinkler head tops it,  are these add-ons excluded from the friction loss calculation?

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