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Types of Standpipe Systems

Thursday, July 22, 2021

NFPA 14 identifies three classes of standpipe systems:

  1. Class I systems are designed for use by fire departments with 2½” hose connections.
  2. Class II systems are designed for use by trained personnel or fire departments with 1½” hose connections.
  3. 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.