What is essential to do when charging a Siamese connection?

When charging a Siamese connection, it is crucial to charge both sides equally to ensure balanced water flow and maintain consistent pressure throughout the system. This practice prevents one side from becoming over-pressurized compared to the other, which could lead to issues such as hose failure or uneven flow to the firefighting appliances.

Charging the left side first or only charging one side creates an imbalance that may affect the efficiency of the water supply during a firefighting operation. Charging after all lines are connected is important, as it ensures that the system is fully prepared to deliver water, but it does not address the critical aspect of equal pressure distribution.

Thus, charging both sides equally is the standard practice that maintains system integrity and operational effectiveness during firefighting efforts.