Automatic Sprinkler Systems

Professionally installed and maintained automatic sprinkler systems will undoubtedly help save lives. Since sprinkler systems respond so quickly, they also radically reduce the heat, flames, and smoke produced in a fire, and make a huge difference on your bottom line.
Different Systems, different applications...

Wet Sprinkler System

A wet sprinkler system is an installation where the sprinkler pipes are permanently charged with water under pressure. It is the simplest and most commonly used system, and since the water is available immediately when a sprinkler activates, it is also the fastest system to come into action.

Since the system is permanently charged with water it is only suitable for use where there is no danger of freezing, in buildings which are constantly heated during cold periods.

This type of system is the easiest to design and install and the simplest to maintain.

When a fire occurs and produces a sufficient amount of heat to activate one or more sprinklers, because an automatic water supply is required, water immediately discharges from the open sprinklers.

A wet sprinkler system should be the first choice of designers and installers because they are more inherently reliable and less costly to maintain. However, wet sprinkler systems should not be considered when temperatures to which the installation could be exposed fall below 4°C.

Dry Sprinkler System

A dry sprinkler system is one in which pipes are filled with pressurized air or nitrogen, rather than water. This air holds a remote valve, known as a dry pipe valve, in a closed position. Located in a heated space, the dry-pipe valve prevents water from entering the pipe until a fire causes one or more sprinklers to operate. Once this happens, the air escapes and the dry pipe valve releases. Water then enters the pipe, flowing through open sprinklers onto the fire.

Dry sprinkler systems provide automatic protection in locations where freezing is possible. Typical dry pipe installations include unheated warehouses and attics, outside exposed loading docks and within commercial freezers.

Many people view dry pipe sprinklers as advantageous for protection in water sensitive areas. This perceived benefit is due to a fear that a physically damaged wet pipe system will leak while dry pipe systems will not. In these situations, however, dry pipe systems will generally not offer any advantage over wet pipe systems. Should impact damage happen, there will only be a mild discharge delay, while air in the piping is released before water flow.

Deluge Sprinkler System

Deluge system, as the name implies, deliver large quantities of water over specific areas in a relatively short period of time. These systems are used to protect against rapidly growing and spreading fires, typically involving flameless liquids, solvents etc.

Deluge systems are similar to automatic sprinkler system except all nozzles are open and will discharge together when control valve opens. These systems are designed to protect areas where fire is likely to spread rapidly and / or where cooling of surrounding equipment is necessary.

Deluge systems are similar to sprinkler systems in that they control a water supply. Control valves, piping, hangers, and discharge devices.

Pre Action Sprinkler System

A pre-action sprinkler system consists of a sprinkler system and an electrical detection system with water held back by the pre-action valve and pressurized air in the sprinkler pipework. In the event of the operation of the electrical detection system the pre-action valve operates and allows water into the sprinkler pipework.

Pre-action systems differ from the normal wet systems in that operation is initiated by an automatic detection system linked to the sprinkler system, and not by the sprinkler itself. Discharge of water can only occur, however, when the sprinkler head or heads operate. The operation of the detection system merely allows water to flow from the alarm valve level into the sprinkler distribution network. Thus a system which is normally 'dry' is given the speed of response of a 'wet' system.

Inspection Checklist

Automatic Sprinkler System

The following are examples of inspection and maintenance that are generally required; they may not represent the requirements of your system. Inspections and maintenance requirements vary for many different reasons.

For more specific information, relating to inspection and maintenance requirements of your fire protection system. You can request a quote online now. If urgent, call (450) 699-1477 and a qualified technician will assist you.

It is highly recommended that qualified technicians perform your maintenance and inspection needs for obvious safety reasons

Monthly Recommended - In-house inspection
  •  Visual Inspection
  • Check pressure gauges - wet system
  • Check air pressure gauges - dry system
 When materials are stored in sprinkler protected areas, a minimum clearance of 18 inches must be left between the sprinklers and the material below them.


Annual  Crown Safety Systems Inc. - NFPA 13, 25
  •  Visual Inspection
  •  System Testing
  • Upon the completion of a new system, acceptance tests must be performed and documented.
  • Every year the inspector's valve must be opened to assure the system operates correctly.
  • You must perform a main drain flow test every year.
  •  Maintenance
  • Records
  •   Report
  •   Certificate
  •   Tag

  •  Notes
  • Water supply for the system must provide the designed flow for a minimum of 30 minutes.
  • A water flow alarm must be included on any system of more than 20 sprinkler heads.
  • The sprinklers should be protected against mechanical damage and must have the ability to be totally drained.
  • Protection for the system should be provided against freezing and exterior corrosion.
  • Insurance companies may ask for bi-monthly, quarterly,semi annual or annual inspection.


Crown Safety Systems Inc.

656 St-Jean Baptiste, Mercier, Quebec,

450 699 1477
Toll free 1 888 699 1477
450 692 5050

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