How many Siamese connections are required in all standpipe systems?

In standpipe systems, at least one Siamese connection is required to facilitate the attachment of fire department hoses. The purpose of a Siamese connection is to allow multiple hose lines to be connected to the standpipe system simultaneously, ensuring that firefighters can efficiently access and utilize the water supply during an emergency.

This feature is particularly important in high-rise buildings or large complexes, where a significant volume of water may be needed to effectively combat a fire. By having at least one Siamese connection, the system supports rapid response and can accommodate the needs of responding units without delay.

While there can be systems with more than one Siamese connection to enhance water flow or prepare for multiple hose lines, the essential requirement is that there is at least one to meet the basic operational needs of firefighting efforts.