What is the K-factor for an upright pendent sprinkler?

The K-factor for an upright pendent sprinkler is indeed 7 psi. The K-factor is a coefficient that relates the pressure of water in the system to the flow rate of water released by a sprinkler. The K-factor is essential for designing and calculating the performance of a sprinkler system, allowing fire protection engineers to determine the minimum required flow and pressure to adequately protect an area.

Upright pendent sprinklers are commonly used in various applications and have a standard K-factor of 7. This means that for every 7 psi of pressure, the sprinkler will release a specific flow rate of water, making it effective for certain coverage areas. Understanding the K-factor helps ensure that firefighters and safety personnel can adequately assess the effectiveness of the sprinkler system in controlling or extinguishing a fire.

The other options represent K-factors that do not correspond to the typical specifications for upright pendent sprinklers, thus emphasizing the importance of recognizing the correct K-factor for various types of sprinkler heads in fire protection design.