Does above ground Fire Fighting Sprinkler Piping require any additional Supports apart from mentioned in NFPA 13 such as Rigid/Thrust at change of direction/in a long run of Piping.
The only additional supports required are sway bracing, which are required where sprinklers are installed in seismic active zones.
client is demanding thrust support @ all piping direction changes even if our zone is "ZERO" seismic region
A full hydraulic transient or surge analysis shall be performed on the complete AG pipe system to determine the pressure transients. The analysis shall cover all anticipated operating conditions including priming, actuated valves, pump testing, wash-down hoses, etc. If there is a significant risk of water hammer, standard techniques should be employed to ensure that pressure transients do not exceed the hydrotest pressure or cause excessive vacuum
conditions, e.g. vacuum breakers.
Water hammer is an effect of the pressure rise (surge) that accompanies a sudden change in the velocity of water flowing in a pipe. When deceleration of velocity is rapid or completely stopped, the kinetic energy of the moving water column is absorbed temporarily by sort of deformation of the pipe and by the compressibility of water. A pressure wave is then formed that is reflected back and forth within the pipe.
Pressure surges may be initiated by the closing of a valve, stopping of a pump, or by the sudden development of abnormal water demand when a water main breaks.
In contrast; thrust blocks could be considered, based on the stress calculation of it.
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