sprinklernotes Using Bushings to Change Pipe Size or Connect Sprinklers “Our local AHJ has recently told us that bushings are not allowed to be installed on the outlet of the branchline where the fire sprinkler is connected. I feel that he is confused the way he is interpreting the code: NFPA 13 2010 edition 6.4.6. The term "not available" in 6.4.6.2 he stated does not make sense since 1" x 1/2" or 1" x 3/4" reducers should always be available. Does this rule apply to bushings to connect a fire sprinkler to a branchline or only to bushings used to reduce pipe sizes on the run of the branchline?”
We have reviewed NFPA 13, Standard for the Installation of Sprinkler Systems, 2010 edition as the applicable standard. Our informal interpretation is the use of bushings is allowed. Sections 6.4.6 and 8.15.9 govern the use of bushings. One-piece reducing fittings are required for pipe changes except when standard fittings are not readily available or new installations are expected to potentially supply sprinklers below a ceiling. For these installations, bushings are allowed, as indicated by the third bullet point in the “Coffee Break Training” document that was included in your email. The primary issue is a concern about leaks, since the number of threaded connections is increased. It is also recognized that it is desirable for ease of modification to allow bushings when a system is installed prior to the finish work where the area and ceilings are expected to be installed. The term “expected” was intentionally used to reflect it recognized that the plans for areas can change, particularly for leased buildings. This exception is expected to be applied to an entire floor. If, after the system is installed, a portion of the floor is identified as not receiving a drop ceiling, the standard does not require the bushings to be removed. Actually, if there is a potential for the area to change hands, such as a lease, one could still expect a ceiling to be installed. Starting with the 2007 edition, section 8.15.19.2 was changed to reflect that bushings are not only acceptable but beneficial in regard to allowing future modifications. This allowance is not predicated upon the presence of a drop ceiling. It’s worth noting these requirements have remained unchanged for the 2013 through 2019 editions of the NFPA 13.
