Water extinguishing system and method for controlling a pump test run in a water extinguishing system

A water extinguishing system comprising:

• a fluid supply for providing an extinguishing fluid;
• a pump which is configured to pump the extinguishing fluid from the fluid supply into a supply line of a pipe system of the water extinguishing system,
• a test line which branches off from the supply line of the pipe system and is configured to conduct the extinguishing fluid pumped by the pump away from the pipe system, wherein the test line has an opening element, which is configured to be movable between a locking position, in which the opening element closes the test line, and an unlocking position, in which the opening element opens the test line, and
• a fluid bypass line which in comparison with the test line has a reduced cross-section and is configured to conduct a predefined portion of the extinguishing fluid around the opening element away from the pipe system,
• wherein the water extinguishing system further comprises:
• at least one control device which is configured to determine at least one parameter value of a parameter indicative of the cross-section of the fluid bypass line and to control a pump test run of the pump on the basis of the parameter value dependent on whether the fluid bypass line can sufficiently conduct the extinguishing fluid pumped by the pump during the pump test run away from the pipe system.