Introduction: Fire safety is a paramount consideration for any building, and among the diverse array of fire water mist systems available, the double interlock fire water mist system stands out for its advanced features and heightened safety measures. In this blog post, we'll explore the basics of double interlock fire water mist systems, shedding light on how they work and the different types within this category, including Electric/Electric Actuation, Electric/Pneumatic Actuation, and Pneumatic/Pneumatic Actuation.
Understanding the Basics: Before delving into the intricacies of double interlock fire suppression systems, let's first grasp the fundamental principle behind water mist. The purpose of a water mist fire suppression system is to detect and control a fire in its early stages, preventing its escalation and minimising damage.
Types of Double Interlock Water Mist Fire Systems:
1. Pre-Action Systems:
- How They Work: Pre-action fire suppression systems feature pipes filled with air, and water is held back by an electrically operated solenoid valve. When a fire is detected, the system opens the valve, allowing water to enter the pipes. However, water is not released from the water mists until a second event, such as the activation of a water mist head, takes place.
- Advantages: This type is ideal for environments where accidental water release could cause significant damage, as it provides an additional layer of protection against false alarms.
2. Dry Pipe Systems:
- How They Work: Unlike traditional water mist systems where pipes are filled with water, dry pipe systems contain pressurised air or nitrogen. When a fire is detected, the air pressure drops, allowing the valve to open and water to flow into the water mist pipes. Similar to pre-action systems, the water is only released through the water mist head after a second confirmation event.
- Advantages: Dry pipe fire suppression systems are suitable for areas exposed to freezing temperatures, as the absence of water in the pipes reduces the risk of freezing such as freezers.
3. Double Interlock Pre-Action Systems:
- How They Work: Combining elements of both pre-action and dry pipe systems, double interlock pre-action water mist fire suppression systems require two events to release water: the detection of a fire and the activation of a water mist head. The pre-action feature ensures that water is held back until the system is doubly sure of a fire emergency.
- Advantages: Offers a high level of reliability and is commonly used in environments where water-sensitive equipment is present such as data centres.
4. Electric/Electric Actuation:
- How They Work: These systems use electrical signals for both the detection of a fire and the activation of water mist heads. When a fire is sensed, an electric signal is sent to the valve, allowing water to flow into the pipes. Subsequently, an electrical signal activates the water mist heads.
- Advantages: Provides a quick and precise response, making it suitable for environments where rapid fire control is crucial.
5. Electric/Pneumatic Actuation:
- How They Work: Electric/pneumatic systems use an electrical signal from the fire detection & alarm system and a pneumatic (air pressure) signal for releasing water through to the water mist heads at the fire. This combination of signals enhances the reliability of the system.
- Advantages: Combines the speed of electrical detection with the reliability of pneumatic actuation, making it a versatile choice for various applications.
6. Pneumatic/Pneumatic Actuation:
- How They Work: in a Pneumatic/Pneumatic Double-Interlocked Preaction water mist fire suppression system a valve controlled by pressure maintained in the pneumatic release system and supervisory pressure maintained in the automatic water mist system pipework. BOTH the release system must activate AND supervisory pressure must be relieved from the water mist system pipework before the valve will open to fill the water mist system with water. If the pneumatic release system (alone) operates due to fire, damage, or malfunction, an alarm will activate, but the valve will NOT open. If the water mist piping is damaged or a water mist head is broken, but the release system has not activated, an alarm will activate but the valve will NOT open.
- Advantages: Well-suited for environments where electrical systems may not be ideal, offering an alternative approach to double interlock fire protection.
Conclusion: Understanding the nuances of these double interlock water mist fire suppression systems, including Electric/Electric Actuation, Electric/Pneumatic Actuation, and Pneumatic/Pneumatic Actuation, empowers building owners, designers, building consultants and facility managers to make informed decisions about the most suitable fire protection solution for their specific needs. As technology continues to advance, these systems play a crucial role in minimising the impact of fires and preserving both life and property.
Here to Help
Call us today to discuss your requirements on 01628 902107 or email us [email protected]
Why choose SolarFire Systems
Nationwide coverage
Multi-year service contracts available
24hr attendance
Skilled trained engineers
Mechanical and Electrical servicing available
Competitive pricing
ISO 9001:15 accredited
ISO 14001:15 accredited
BAFE SP 203 accredited
