The depth of piping is measured from which point?

The depth of piping is measured from the top of the piping. This measurement is critical because it determines how deep the pipeline is buried, which influences factors such as frost protection, soil load depth, and overall integrity of the fire service mains. Proper identification of this measurement point ensures that the installation adheres to the standards set forth in NFPA 24 for protecting the piping system from environmental impacts and ensuring adequate burial depth to prevent damage.

Using the top of the piping as the reference point provides a consistent and practical approach for installation practices, allowing contractors to maintain uniformity and compliance with the installation criteria specified in NFPA 24.