Hello fire protection experts: Is the safety margin that we add during hydraulic calculations of 1bar or 10% mandatory by NFPA13? if yes it is the article refrence
Commentary from 2010 NFPA 13 Handbook under Subsection 3.3.12 Hydraulically Designed System:
NFPA 13 does not require a safety factor to be applied to either the water supply or the system demand. A safety factor ensures that more water than required is available. The use of a safety factor is considered good practice but is not required. Although NFPA 13 does not specifically require the application of safety factors in any part of a sprinkler system design or installation, safety factors are implicitly embedded in many of the document’s requirements. However, it is important to note that, when comparing the system demand to the available water supply, the designer should determine the reasonable worst-case available supply.
I have evaluated sprinkler systems and found that over time where some designs that did not consider the seasonal changes in the water supply left the available water supply well below the system demand. The refitting of fire pump and/or tanks were very costly for the owners
thank you dear Milton Werner for your very clear answer, so no pressure safety margin required by NFPA13 or to be expected when displaying the results of hydraulic calculations and the curve. it is just a good practice in% or adds some Psi.
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