What does the term "ordinary hazard density" refer to in sprinkler calculations?

The term "ordinary hazard density" in the context of sprinkler calculations refers specifically to the amount of water flow needed over a designated area to effectively control or suppress a fire. It is a critical factor in determining how many sprinklers are required and their distribution across a given space.

When calculating ordinary hazard density, the focus is on the water flow, typically expressed in gallons per minute (GPM), that is necessary to ensure adequate coverage and protection in areas with standard fire hazards. This measurement primarily helps in designing sprinkler systems to meet the minimum requirements set by fire codes and standards.

This concept is essential as it not only influences the design and layout of the sprinkler system but also ensures that the system will perform effectively in the event of a fire. By understanding ordinary hazard density, contractors can adequately plan for the required water supply and distribution to achieve optimal fire protection.