В СП5 об этом,разумеется, ничего нет. Но можно посмотреть зарубежные материалы.
https://www.victaulic.com/systems/vicflex-f...itting-systems/https://www.pmengineer.com/articles/87873-f...ler-connectionsФитинг, в который непосредственно вворачивается спринклер,при применении гибких патрубков должен быть закреплён на подвесном потолке или прикреплён к коробу. Иначе при работе спринклер и гибкий(гофрированный) патрубок пустятся в пляс.
В NFPA-13 2019 нашлось следующее:
17.4.1.3.3.3* Where flexible sprinkler hose fittings exceed 6 ft
(1.8 m) in length and are supported by a suspended ceiling in
accordance with 17.4.1.3.3.2, a hanger(s) attached to the structure
shall be required to ensure that the maximum unsupported
length does not exceed 6 ft (1.8 m).
A.17.4.1.3.3.3 The committee evaluation of flexible sprinkler
hose fittings supported by suspended ceilings was based on
information provided to the committee showed that the maximum
load shed to the suspended ceiling by the flexible hose
fitting was approximately 6 lb (2.7 kg) and that a suspended
ceiling meeting ASTM C635, Standard Specification for the Manufacture,
Performance, and Testing of Metal Suspension Systems of
Acoustical Tile and Lay-In Panel Ceilings, and installed in accordance
with ASTM C636, Standard Practice for Installation of Metal
Ceiling Suspension Systems for Acoustical Tile and Lay-In Panels, can
substantially support that load. In addition, the supporting
material showed that the flexible hose connection can be
attached to the suspended ceilings because it allows the necessary
deflections under seismic conditions.
17.4.1.3.3.4* Where flexible sprinkler hose fittings are used to
connect sprinklers to branch lines in suspended ceilings, a
label limiting relocation of the sprinkler shall be provided on
the anchoring component.