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26.2.5 Pipe Support
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Pipe supports shall comply with the following:
- Pipe supports shall be designed to provide adequate lateral, longitudinal, and vertical sway bracing.
- The design shall account for the degree of bracing, which varies with the route and operation of the vessel.
- Bracing shall be designed to ensure the following:
- Slamming, heaving, and rolling will not shift sprinkler piping, potentially moving sprinklers above ceilings, bulkheads, or other obstructions.
- Piping and sprinklers will remain in place at a steady heel angle at least equal to the maximum required damaged survival angle.
- Pipe supports shall be welded to the structure.
- Hangers that can loosen during ship motion or vibration, such as screw-down-type hangers, shall not be permitted.
- Hangers that are listed for seismic use shall be permitted to be used in accordance with their listing.
Sprinkler piping shall be supported by the primary structural members of the vessel such as beams, girders, and stiffeners.
The components of hanger assemblies that are welded directly to the ship structure shall not be required to be listed.
U-hook sizes shall be no less than that specified in Table 9.1.2.4.
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