When passing through walls, ceilings, or floors of the fire pump room enclosure, the hole for the pipe must be nominally larger than the pipe by what diameter?

When pipe penetrates walls, ceilings, or floors of a fire pump room enclosure, it is essential that the hole created for the pipe is nominally larger than the pipe to allow for expansion and contraction, as well as to accommodate insulation and any firestop materials. The industry standard specifies that the hole must be 2 inches larger in diameter than the pipe. This spacing is crucial in maintaining proper fire safety measures, ensuring that there is sufficient room for materials that can help seal the penetration against fire and smoke propagation.

This requirement also assists in preventing damage to the pipe due to movement or thermal expansion. By following this guideline, sprinkler fitters can ensure that the installation remains compliant with fire safety regulations and maintains the integrity of the fire pump room enclosure.