NFPA Exam CFI-I Topic 2 Question 4 Discussion

Comprehensive and Detailed Step-by-Step Explanation:

Fire Hydrant Piping Diameter:

Per NFPA 24 (Standard for the Installation of Private Fire Service Mains and Their Appurtenances), Section 5.2.1, the minimum diameter for piping serving fire hydrants on private fire service mains is 6 inches (152.4 mm).

Why 6 Inches is Required:

A minimum 6-inch pipe ensures sufficient water flow and pressure to meet firefighting demands.

Other Options Explained:

Option A (4 in): Too small; insufficient for hydrant water supply.

Option C (8 in) and Option D (10 in): Acceptable but exceed the minimum requirement.

Summary:

The minimum diameter for piping serving fire hydrants on private fire service mains is 6 inches (152.4 mm).