Types of Standpipe Systems
NFPA 14 identifies three classes of standpipe systems:
- Class I systems are designed for use by fire departments with 2½” hose connections.
- Class II systems are designed for use by trained personnel or fire departments with 1½” hose connections.
- Class III systems are designed for use by trained personnel or fire departments with both 1½” and 2½” hose connections.
These systems can then be designed as a combination of a wet, dry, automatic, manual, or semiautomatic system as defined and required by NFPA 14.
Under IBC Section 905.3.1, “Height,” which requires a standpipe to be installed throughout buildings, the required type of standpipe is a Class III system.
Generally, in most buildings, the standpipe system can be designed as a Class I system due to the provision of Exception I to Section 905.3.1 of the IBC for buildings protected throughout by automatic sprinkler systems.
NFPA 14 permits Class I standpipe systems to be manual wet systems for buildings not classified as a high-rise above 75 ft. A manual standpipe is to be used when the building is between 30' - 75'. Once you break 75', you must have an automatic standpipe.