The spkGraph tool offers fire sprinkler designers three different types of water supply graphs to ensure compliance with various design standards. Additionally, it can generate hydraulic graph paper with customizable flow and pressure scales, using a logarithmic scale with a power of either 1.85 or 2.00 (in accordance with NFPA and European style guidelines). This tool is a valuable resource for those in the fire sprinkler design industry.

Example of a maximum flow demand calculation for BS 9251

BS 9251 - Maximum flow demand – Qmax

Sprinkler systems designed to BS 9251 & EN 16951 require the operation of sprinkler heads in the most hydraulically favourable area to be balanced with the fire pump performance curve. This is usually done by plotting the pump curve and favourable area demand onto the graph paper. The intersection of the two is the system's maximum flow demand (also known as the Qmax point). This point is used to determine the capacity of the stored water for the system.

spkGraph can simplify this process by allowing the design to add a few points from the pump curve, the most favourable design point and the height of the height's sprinkler in the most favourable area. spkGraph will plot the pump curve and the system demand line and calculate the maximum flow demand for the system.

NFPA 13 water supply chart

spkGraph can easily create an NFPA 13 water supply graph. You specify a minimum a 3 data points for the city water supply or pump curve and the system pressure and flow demand point and spkGraph will draw and display the graph.

Hydraulic graph paper

Sometimes you need to plot a water supply graph but cannot get the correct scales, helps at hand with spkGraph. 

With spkGraph you can specify your graph's maximum pressure and flow and select the logarithmic scale for the flow. You can choose between N^1.85 or N^2, so it suits NFPA and European design standards. Add your header, and you finished.
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