For normal operations, all main control valves and riser isolation valves must be kept in which position?

For normal operations, all main control valves and riser isolation valves must be kept in the open position. This allows for an uninterrupted supply of water for fire protection systems, such as sprinklers and standpipes, to function effectively in the event of a fire emergency. Maintaining these valves in the open position ensures that the fire suppression systems are ready to activate immediately when needed, thereby providing a critical layer of safety for both occupants and property.

Keeping the valves open is essential for compliance with fire safety codes and regulations, as they are designed to deliver water swiftly to combat fire incidents. If these valves were closed or disabled, it would severely compromise the effectiveness of the fire protection systems and could lead to catastrophic outcomes during an emergency. Hence, ensuring that they are in the open position during normal operations is a standard best practice.