As we know on case of fire the number of operating sprinkler in the most remote area is 12 sprinklers "light hazard &ordinary"
Although the pipe sch. mentioned the number of sprinklers up to 275 sp. 150mm pipe diameter?
When using the density/area method for light and ordinary hazard systems a 140 m² operating area is usually chosen. Since sprinkler spacing varies in light and ordinary hazard systems, the actual amount of sprinklers ranges from 7 to 15 sprinklers. Room design method requires calculating the amount of sprinkler found in largest room.
Pipe schedule method does not have an amount of sprinklers operating, it is just used for sizing pipes.
Pipe schedule referers to operating sprinklers only that is mentioned also in Emmanuel Reyes's answear. Your supply pipe diameter tresholds are now 50, 65 or maximum 80 mm. It depeneds on your water source and pressure drops. It's recommended to calculate it Sir
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