Industrial fire hazards vary from facility to facility based on processes, stored commodities, process equipment, and environmental conditions. Selecting the correct type of fire suppression sprinkler system is critical in warehouse, manufacturing, storage, refinery, utility, and high-hazard process applications. A well-designed industrial fire sprinkler system helps suppress a developing fire quickly, minimizes damage to a facility, and provides additional protection to personnel involved in emergency response.
The various sprinkler systems and sprinkler types available are selected based on the degree of hazard presented by the protected commodity or process (ordinary versus high), the required rate of water discharge, the ambient temperatures at which the commodity or process operates, and the locations within a facility where sprinklers will be installed. In the United States, the governing standard for design and installation is NFPA 13, Standard for the Installation of Sprinkler Systems, which is widely adopted internationally.
What Is a Fire Sprinkler System?
A fire sprinkler system is automated fire safety equipment that includes piping, valves, an alarm system, a water supply, and sprinkler heads. Once a sprinkler system detects sufficient heat (or, in some designs, receives a detection signal), it discharges water onto the affected area. There are several types of fire sprinkler systems, and the right choice depends on the hazard, layout, and operating conditions of the facility being protected.
Main Types of Fire Sprinkler Systems
NFPA 13 defines four primary types of fire sprinkler systems. A fifth, foam water, is commonly grouped with them for industrial use and is covered by NFPA 11. The main types of fire sprinkler systems used in industrial facilities include:
- Wet pipe sprinkler systems
- Dry pipe sprinkler systems
- Preaction sprinkler systems
- Deluge sprinkler systems
- Foam water sprinkler systems
These are widely used as part of an industrial and commercial fire protection strategy. The sections below explain how each type of fire sprinkler system works and where it is best applied.
Wet Pipe Fire Sprinkler System
Wet pipe systems have water constantly within the piping network. When the sprinkler heads react to heat, water discharges immediately over the fire area, and only the sprinklers nearest the fire activate. This is the simplest, most reliable, and most cost-effective system, which is why it is the most common type of fire sprinkler system.
Best suited for:
- Industrial buildings
- Warehouses
- Manufacturing units
- Commercial facilities
- Areas where temperatures stay reliably above 40°F (4°C)
Dry Pipe Fire Sprinkler System
Dry pipe systems contain pressurized air or nitrogen inside the pipes instead of water. When a sprinkler activates, the air pressure drops, the dry pipe valve opens, and water flows into the piping. Because there is a delay while water travels to the open sprinkler, NFPA 13 imposes water-delivery time requirements and effectively limits system size and volume.
Best suited for:
- Cold storage facilities
- Freezer rooms
- Unheated warehouses
- Low-temperature industrial zones
Dry pipe systems are typically used wherever the water in a traditional wet pipe system would be at risk of freezing.
Pre action Fire Sprinkler System
Pre action systems use an independent detection system (heat or smoke detection) that operates in addition to the automatic sprinklers. They keep the piping dry until a detection event occurs, which reduces the chance of accidental water discharge from a damaged sprinkler or fitting. NFPA 13 recognises single-interlock and double-interlock preaction systems:
- Single interlock water is admitted to the piping upon operation of the detection system; sprinklers still must open for water to discharge.
- Double interlock water is admitted only when both the detection system and the automatic sprinklers operate. These behave like dry pipe systems for water-delivery purposes and require a larger design area; they are common for refrigerated and high-value spaces.
Best suited for:
- Control rooms
- Data centers
- Electrical rooms
- Critical equipment areas
- Archives, museums, and other water-sensitive facilities
Preaction systems are popular with companies protecting high-value industrial equipment where an accidental discharge would be costly.
Deluge Fire Sprinkler System
Deluge systems use open sprinklers or nozzles connected to a deluge valve. The valve is opened by an independent detection system, and when it opens, water discharges simultaneously from every sprinkler across the protected area.
Best suited for:
- Transformer protection
- Chemical processing plants
- Fuel handling areas
- Process units
- High-hazard industrial zones
Deluge systems are selected to protect against extreme fire-spread risk where fast, area-wide water application is critical.
Foam Water Sprinkler System
Foam water sprinkler systems combine water with foam concentrate to suppress flammable liquid fires effectively. The foam cools the fuel surface and reduces oxygen contact with flammable vapours. These systems are addressed by NFPA 11.
Best suited for:
- Fuel storage facilities
- Loading bays
- Aircraft hangars
- Oil & gas facilities
- Chemical storage areas
- Process industries
Foam water systems are used worldwide wherever flammable liquids pose a fire hazard in industrial environments.
Types of Fire Sprinklers Used in Fire Fighting Systems
Beyond the system type, individual sprinklers (sprinkler heads) are classified two ways: by installation orientation and by deflector or spray-pattern design. The correct selection improves overall fire suppression performance. Common fire sprinkler types include:
- Upright sprinklers (orientation)
- Pendent sprinklers (orientation)
- Sidewall sprinklers (orientation)
- Spray sprinklers the modern standard deflector design used in most applications
- Conventional (old-style) sprinklers a legacy spray pattern, largely superseded by spray sprinklers
- ESFR (Early Suppression Fast Response) sprinklers for high-piled and rack storage
- CMSA (Control Mode Specific Application) sprinklers for storage where ESFR is not suitable
For industrial warehouses and distribution centers, ESFR and CMSA storage sprinklers are often the defining choice under NFPA 13, since they are designed specifically for high-piled and rack storage fires.
Upright Sprinklers
An upright sprinkler is installed above the piping and sprays water upward toward the deflector for distribution. Common applications include exposed piping systems, industrial sheds, warehouses, mechanical rooms, and utility spaces with open ceiling structures.
Pendent Sprinklers
Pendent sprinklers hang down from the piping below the ceiling and direct water downward to protect the area below. Common applications include finished ceiling areas, offices inside industrial buildings, commercial spaces, and enclosed protected rooms.
Sidewall Sprinklers
Sidewall sprinklers extend from a wall and are used where ceiling-mounted piping is difficult or impossible. Common applications include corridors, small rooms, narrow spaces, and layout-restricted areas.
Spray and Conventional Sprinklers
Standard spray sprinklers produce a hemispherical, downward distribution pattern and are the modern default for most fire protection layouts. Conventional (old-style) sprinklers use an older pattern that distributes water both upward and downward and are now used mainly in specific retrofit or legacy applications.
Fire Sprinkler Colour Codes and Temperature Ratings
The colour of a sprinkler’s glass bulb or fusible element indicates its temperature classification the maximum ambient temperature at which the sprinkler is intended to operate. NFPA 13 specifies temperature classifications (such as ordinary, intermediate, high, and higher ratings) and ties the selected rating to the maximum expected ceiling or ambient temperature at the sprinkler location.
Typical factors considered during selection include:
- Ambient operating temperature
- Heat exposure conditions
- Maximum ceiling temperature
- Industrial process conditions
- Hazard classification
The correct temperature classification ensures sprinklers operate reliably without premature activation from normal process or ambient heat.
Comparison of Fire Sprinkler Systems and Industrial Applications
| Sprinkler System Type | How It Works | Best Used For | Industrial Applications |
|---|---|---|---|
| Wet Pipe System | Water remains inside the pipes at all times | Standard heated buildings | Warehouses, factories, storage areas |
| Dry Pipe System | Pipes hold pressurized air or nitrogen until activation | Low-temperature / freezing areas | Cold storage, freezer rooms, unheated warehouses |
| Preaction System | Detection event required before water enters the pipes (single, non-interlock, or double interlock) | Water-sensitive equipment protection | Data centers, electrical rooms, archives |
| Deluge System | Open sprinklers/nozzles discharge water simultaneously | High-hazard, fast-spreading fire risk | Chemical plants, transformers, fuel handling |
| Foam Water System | Water mixed with foam concentrate (per NFPA 11) | Flammable liquid hazards | Oil & gas, fuel storage, loading bays |
| Storage Sprinklers (ESFR / CMSA) | High-volume ceiling-level sprinklers designed to suppress or control high-piled storage fires | High-piled and rack storage | Distribution centers, high-bay warehouses, logistics hubs |
The comparison above helps determine which fire protection sprinkler system is most appropriate for a given industrial application.
How to Choose the Right Fire Sprinkler System for Industrial Applications
The appropriate system depends on operating conditions and hazards. Key considerations include:
- Hazard type and commodity classification
- Fire load level
- Ceiling height and storage height
- Ambient temperature and freeze risk
- Water supply availability
- Response time requirements
- Protected equipment sensitivity to water
- Approval, code, and compliance requirements (NFPA 13 and related standards)
- Maintenance accessibility
Properly planned and installed industrial fire protection systems provide consistent operation across all sprinkler types and the applications where they are used.
Industrial Areas Where Fire Sprinkler Systems Are Used
Fire sprinkler systems are widely used across industrial environments, including:
- Warehouses
- Manufacturing plants
- Power plants
- Refineries
- Process plants
- Chemical storage facilities
- Utility areas
- Loading bays
- Logistics hubs
- High-risk storage zones
The type of fire sprinkler system is determined by the process hazard and operating conditions present at the facility being protected.
Why Choose HD Fire for Fire Sprinklers and Accessories
At HD Fire Protect we offer a range of sprinkler systems and accessories, as well as engineered fire protection solutions for industrial applications. We also provide project documentation, engineering drawings, and fire protection system design services to meet the needs of each unique industrial fire protection system.
Conclusion
Choosing an appropriate fire sprinkler system depends on the hazard level of the process, the type of facility, the desired operating temperature, the volume of water required, and the industry using the system. Wet pipe and dry pipe systems provide general suppression for most fires; preaction systems protect water-sensitive areas; deluge systems provide rapid area-wide flooding; and foam water systems help smother flammable liquid fires. Storage sprinklers such as ESFR and CMSA are designed for high-piled warehouse storage. Selecting the right system for each need improves the efficiency and reliability of an industrial fire protection system.
Identify your best fire protection option with HD fire sprinklers and accessories for industrial plants and other high-risk processes.
Frequently Asked Questions About Fire Sprinkler Systems
NFPA 13 defines four primary types of fire sprinkler systems: wet pipe, dry pipe, preaction, and deluge. Foam water systems (earlier covered by NFPA 16 & now NFPA 11) are commonly grouped with them for industrial use. Each system is selected based on the fire hazard, building conditions, water discharge requirement, ambient temperature, and risk level of the protected area.
For most standard, heated industrial buildings and warehouses, a wet pipe fire sprinkler system is commonly used. For cold storage or unheated areas, a dry pipe system is more suitable. High-piled or rack storage typically requires storage sprinklers such as ESFR or CMSA, and high-hazard areas may require deluge or foam water systems depending on the stored material and fire risk.
A wet pipe system keeps water in the piping and discharges when sprinklers activate. A dry pipe system holds pressurized air or nitrogen until activation. A preaction system requires a detection event before water enters the pipes and comes in single interlock, non-interlock, and double interlock types. A deluge system uses open sprinklers or nozzles to discharge water simultaneously across a high-risk area.
Deluge sprinkler systems are used in high-hazard industrial facilities where rapid, area-wide water discharge is required. Common applications include transformer areas, power plants, chemical processing zones, fuel handling areas, loading bays, and process plants where fire can spread quickly.
Foam water sprinkler systems should be used where a flammable liquid fire risk is present, such as fuel storage areas, chemical storage zones, loading and unloading areas, aircraft hangars, oil and gas facilities, and process industries. Foam suppresses fire by cooling the surface and reducing oxygen contact with flammable vapours.
Sprinklers are classified by orientation (upright, pendent, sidewall) and by deflector or spray-pattern design (standard spray, conventional/old-style, and storage sprinklers such as ESFR and CMSA). They are selected based on ceiling design, installation position, spray pattern, hazard type, and the protected area. They are also commonly searched as fire sprinkler heads.
The right system is chosen after evaluating the fire hazard, occupancy and commodity type, ceiling and storage height, ambient temperature, water supply, fire load, response time, approval requirements, and maintenance access. Ordinary-hazard facilities may use wet pipe systems, while high-risk areas may require deluge, foam water, or specialized storage sprinklers under NFPA 13.