The air supply to a dry system must be capable of refilling the system to normal air pressure in what maximum time?

The requirement for the air supply to a dry sprinkler system to refill to normal air pressure within a maximum time frame of 30 minutes is rooted in safety and operational efficiency. A dry pipe system relies on pressurized air to hold back water in the pipes. If there is a sprinkler activation due to heat detection, the air pressure must be quickly restored to enable the system to function as intended.

The 30-minute time limit ensures that in the event of a sprinkler operation, the system can be rapidly reset. This rapid refill is crucial to minimize the chances of water damage to the structure and to ensure that the system is ready for potential subsequent fire incidents efficiently. Longer refill times would not adequately meet the safety needs, as the quicker the system can return to operation, the better it can protect the property and occupants.

This standard is part of the requirements set forth in fire safety standards, emphasizing the importance of prompt system readiness, which is paramount for effective firefighting measures.