What is a preaction?

Pre-action valves are electrically operated valve that is activated by heat, smoke or flame. The steps for activation of a pre-action sprinkler system are: A fire is detected, and the pre-action valve opens, allowing water to flow into the sprinkler pipes.

What is a preaction panel?

Preaction systems are designed to protect water-sensitive areas such as freezers, museums, computer rooms, and clean rooms. These locations contain water-sensitive equipment, precious objects, or are sensitive areas where accidental water discharge is undesirable. Preaction systems may take the place of dry systems.

What is the difference between single and double interlock preaction systems?

A single interlock system is activated only upon the event of detection device activation. Two separate events must happen; sprinkler activation and detection device activation, before water is admitted into a double interlock system.

Where is preaction system used?

This feature provides an added level of protection against inadvertent discharge. For this reason, pre-action systems are frequently employed in water sensitive environments such as archival vaults, fine art storage rooms, rare book libraries and computer centers.

What is the difference between deluge and preaction?

These are a middle ground between dry and wet fire protection systems. The major difference between a deluge suppression system and a pre-action system is that pre-action systems are filled with compressed air. The sprinkler heads remain closed until needed, and a pre-action valve holds back the water.

What is a single interlock preaction system?

Pre-action / Single or double interlock system A single interlock system operates in a similar manner as the dry pipe system. This type of system has one event that must occur before water runs into the system; fire detection from a heat or smoke detector where the pre-action valve opens.

What is a non-interlock pre-action system?

A non-interlock pre-action system functions very much like a single interlock system, in that if the supplemental detection device is activated the main valve will open allowing water into the sprinkler piping, ready to be released to the heat source once the heat rises enough to activate the automatic sprinklers.

What is the primary advantage of a preaction sprinkler system?

Advantages of using pre-action fire sprinkler systems include: The dual action required for water release – The pre-action valve must operate and sprinkler heads must fuse. This feature provides an added level of protection against inadvertent discharge.