NFPA 13, Standard for the Installation of Sprinkler Systems, outlines the requirements for acceptable water supplies. While it permits the use of gravity tanks, it explicitly mandates that their installation must comply with a separate, dedicated standard. That standard is NFPA 22, Standard for Water Tanks for Private Fire Protection. NFPA 22 provides the comprehensive requirements for the design, construction, installation, and maintenance of tanks, including gravity tanks, ensuring they function as a reliable water source for fire protection systems.

A. NFPA 13 specifies the requirements for the sprinkler system itself and refers to other standards for the installation of specific water supply sources like tanks.

B. NFPA 20 is the standard for the installation of stationary fire pumps, which are a component of a water supply, not the water storage tank.

D. NFPA 24 covers the installation of private fire service mains and their appurtenances, which is the piping connecting the water supply to the building's system.

1. NFPA 13, Standard for the Installation of Sprinkler Systems (2022 Edition). Chapter 5, Water Supplies, Section 5.2.2.2 states, "A gravity tank shall be installed in accordance with NFPA 22."

2. NFPA 22, Standard for Water Tanks for Private Fire Protection (2023 Edition). Chapter 1, Administration, Section 1.1, Scope, states, "This standard provides the minimum requirements for the design, construction, installation, and maintenance of tanks and accessory equipment that supply water for private fire protection..."

3. Cote, A. E., & Harrington, G. P. (Eds.). (2008). Fire Protection Handbook (20th ed.). National Fire Protection Association. Volume II, Section 16, Chapter 2, "Water Supply Systems," page 16-36, explicitly states that "NFPA 22, Standard for Water Tanks for Private Fire Protection, is the standard that contains provisions for the design, construction, installation, and maintenance of these tanks."