According to the NFPA 13, Installation of Sprinkler Systems, once a sprinkler is removed it cannot be reinstalled. This rule was added to the 2013 edition of the NFPA because of concerns that the sprinkler could be damaged during the removal process.
The addition of this stipulation is not surprising as removing a sprinkler can cause damage to occur to the threading, water seal or operating element. While there may be no visible signs of damage, the sprinkler's performance may still be negatively affected.
A simple requirement and yet this new stipulation has stirred debates. The controversy stems from the wording, which simply states "When a sprinkler is removed" without any specifications for its removal.
This ambiguity is the reason for that two interpretations have emerged. Both of which are directly related to whether or not there is the presence of a drop riser nipple, or other fitting between the sprinkler and the branch-line outlet.
According to one side, provided the sprinkler is detached from the sprinkler system without the sprinkler being touched, the potential for mechanical damage is completely eliminated. The sprinkler and the fitting can therefore be reinstalled.
The other side of the debate argues that regardless whether or not the sprinkler has been physically touched, it can still be damaged as it waits to be reinstalled. For example, the sprinkler or the container in which it is stored could be dropped or kicked and compromise its functionality.
These two sides faced off at the development of the 2013 edition of the NFPA 13 and it is likely more attention will be given to this issue at the development meetings for the 2016 edition.
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