What happens when a sprinkler head opens in a Dry Pipe Sprinkler System?

When a sprinkler head opens in a Dry Pipe Sprinkler System, the correct outcome is that the dry pipe valve opens. This system is designed to hold back water under pressure in the pipes until a sprinkler head is activated, which typically occurs when there is a fire.

Here’s how it works:

1. In a dry pipe system, the pipes are filled with air or nitrogen rather than water, preventing the risk of freezing in cold environments. The system remains pressurized until a fire breaks out and a sprinkler head opens.

2. When a sprinkler head opens due to the heat of a fire, it releases the air pressure in the pipes. This drop in air pressure triggers the dry pipe valve to open.

3. Once the valve opens, water from the supply line flows into the dry pipes and is discharged through the activated sprinkler head, providing the necessary means to suppress the fire.

This specific functioning is crucial for understanding fire safety measures and the mechanics of sprinkler systems in buildings. Therefore, selecting that the dry pipe valve opens accurately describes the operational response of the system when a sprinkler head is activated.