In NFPA 13 under "Location of Hangers on Branch Lines", Section 188.8.131.52 (2016 Edition) states that "wall-mounted sidewall sprinklers shall be restrained to prevent movement."
This section does not relate to seismic restraint, and annex material clarifies as much.
How is this sidewall-restraint typically achieved?
Many sidewall sprinkler installations have an armover and a drop that goes down the wall before a reducing elbow serves the sprinkler in the wall, and I don't recall ever seeing a means to restrain the pipe (or sprinkler) for steel jobs.
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