DS 2-8 Earthquake Protection for Water-Based Fire ... - FM Global

2-8 Earthquake Protection
Page 36 FM Global Property Loss Prevention Data Sheets
E. Provide a flexible coupling within 2 ft (0.6 m) above the initial in-rack sprinkler pipe drop attachment
to the rack (see Fig. 20).
F. Provide flexible coupling(s) on the horizontal portion of in-rack sprinkler piping within 2 ft (0.6 m) of
the connections to vertical pipe drops (see Fig. 20).
G. When pipe drops supplying in-rack sprinklers are connected to overhead horizontal piping via an
armover, no flexible couplings are needed on the armover. However, provide a hanger of the type that
will resist vertical upward movement per Section 2.2.1.8.1(B) and Figure 20.
Fig. 19. Arrangement of combination risers for ceiling sprinklers and in-rack sprinklers/hose stations
2.2.1.4.6 For drops to below suspended ceilings, mezzanines, walkways, etc. that supply more than one
sprinkler (see Fig. 21), provide flexibility per the following guidelines.
A. Provide a flexible coupling within 2 ft (0.6 m) of the connection to overhead piping or armovers for
pipe drops that exceed 2 ft (0.6 m) in length.
B. Provide flexible coupling(s) on the horizontal portion within 2 ft (0.6 m) of any tee or elbow connecting
pipe drops to sprinkler piping beneath ceilings, mezzanines, walkways, etc.
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