When replacing sprinklers in a system, is it necessary to perform a hydrostatic test?

Section 5.4.3 of the standard refers to NFPA 13 \"Standard for the Installation of Sprinkler Systems\" when maintenance or repair involves more than 20 sprinklers. This section is intended to address common installation issues such as pipe, fittings, hangers and so on.

It is sometimes a common practice to hydrotest a system without sprinklers installed, i.e.: with ½\" plugs installed in the bottom of a drop to a pendent sprinkler and then install the sprinkler after final adjustment of the drop once the finished ceiling is installed. Both standards are silent on this issue. My suggestion is to consult the local fire marshal to determine what he/she will accept. In most cases when replacing sprinklers only, and not modifying the pipe, a hydrostatic test is not required.

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Quick FAQ....

I have a standpipe system with two risers. The original design indicates a total flow of 750 gpm (2839 Lpm). Am I required to flow this much water for the five year flow test?

No. When conducting the five year flow test, one riser is tested at a time. Therefore, the flow should be a total of 500 gpm (1892 Lpm), 250 gpm (946 lpm) for each of the two topmost outlets.