TCFP Plans Examiner Practice Test

What should be observed and recorded last in the main drain test procedure?

1. Pressure on system side

2. Final static pressure

3. Pressure drop

4. Pressure at main drain

The correct answer is: Final static pressure

The final static pressure is recorded last in the main drain test procedure because it provides a critical baseline measurement that reflects the system's status after all other observations and measurements have been made. This final static pressure indicates the pressure in the system when there is no flow, which is essential for understanding the overall health and functionality of the fire protection system being tested. Recapping the process, the initial measurements would involve observing the pressure at the main drain and any pressure drops as water flows from the system. These measurements help to analyze the efficiency and integrity of the piping and devices involved. However, concluding with the final static pressure ensures that any changes during the testing process are accounted for, thereby allowing for a comprehensive assessment of the system's performance when it is still. This method helps ensure compliance with safety standards and provides a complete picture of the system's capabilities.