Pre-Action Systems
Pre-Action Systems combine dry-pipe features with an independent fire-detection system. Valve logic depends on the pre-action type selected (non-interlock, single or double interlock); a double-interlock system needs both detector activation and an open sprinkler head before water flows. They protect sensitive sites from accidental discharge. Ideal for data centers, libraries, and museums.
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Pre-action systems solve a difficult challenge: automatic protection at sites where accidental discharge would cause losses larger than a fire. The design: a dry pipe network (air-filled only, no water), a pre-action valve controlled by a signal from the detection system, an independent smoke or heat detection system (multiple ceiling detectors), ordinary sprinkler heads, and a control panel that links detection to the valve. Activation types: non-interlock, where the valve opens on either detector activation or a sprinkler head opening, whichever comes first; single interlock, where the valve opens on fire detection (first stage) and then water flows when any head opens (second stage) — faster flow but more exposed to false activation; double interlock, which needs both a head opening and a detector signal before the valve opens — the most protection against accidental discharge but slower. Key advantage: reduced risk of unintended discharge from a broken pipe or damaged head because the pipes are dry in standby, with a water-delivery time set and documented in the system design according to the interlock type. Applications: data centers and server rooms, libraries and archives, museums and heritage sites, industrial control rooms, pharmaceutical stores, and sensitive laboratories. A substantive difference from wet and dry systems: tying valve opening to the detection system (with both events required in double-interlock systems) reduces the risk of accidental discharges that could destroy equipment. A technical note: cost is higher and maintenance more complex, but protection from accidental water damage justifies the investment at sensitive sites. Specifications follow NFPA 13 and EN 12845.
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Pre-action systems solve a difficult challenge: automatic protection at sites where accidental discharge would cause losses larger than a fire. The design: a dry pipe network (air-filled only, no water), a pre-action valve controlled by a signal from the detection system, an independent smoke or heat detection system (multiple ceiling detectors), ordinary sprinkler heads, and a control panel that links detection to the valve. Activation types: non-interlock, where the valve opens on either detector activation or a sprinkler head opening, whichever comes first; single interlock, where the valve opens on fire detection (first stage) and then water flows when any head opens (second stage) — faster flow but more exposed to false activation; double interlock, which needs both a head opening and a detector signal before the valve opens — the most protection against accidental discharge but slower. Key advantage: reduced risk of unintended discharge from a broken pipe or damaged head because the pipes are dry in standby, with a water-delivery time set and documented in the system design according to the interlock type. Applications: data centers and server rooms, libraries and archives, museums and heritage sites, industrial control rooms, pharmaceutical stores, and sensitive laboratories. A substantive difference from wet and dry systems: tying valve opening to the detection system (with both events required in double-interlock systems) reduces the risk of accidental discharges that could destroy equipment. A technical note: cost is higher and maintenance more complex, but protection from accidental water damage justifies the investment at sensitive sites. Specifications follow NFPA 13 and EN 12845.
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