Underground Fire Hydrant DN100/DN150
The CA-FIRE Underground Fire Hydrant is a flush-mounted, ductile iron (QT450) fire water supply point installed below ground level. Available in DN100/DN150 with single or dual outlets, it delivers reliable water/foam access at 1.6 MPa while keeping road surfaces clear. Frost-protected auto-drain and encrypted variants available on request
Description
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Products Description
Underground Fire Hydrant DN100/DN150
The CA-FIRE subterranean hydrant is a recessed, below-grade water supply terminal purpose-built for civic thoroughfares, residential precincts, commercial precincts, and industrial premises where surface zones must remain unobstructed. The hydrant chassis is housed within a shielded vault beneath a cast ferrous surface enclosure-only the entry lid rests at pavement elevation-maintaining roadways and vehicular corridors clear of protruding surface apparatus while still furnishing firefighting personnel with expeditious, dependable access to the subterranean water distribution main.
Fabricated from high-tensile nodular cast iron (QT450 specification), the hydrant endures the dual principal hazards of buried service: dynamic loading from automotive traffic and earthmoving machinery, together with progressive material degradation from soil dampness and phreatic water. It sustains a consistent 1.6 megapascal operating pressure through a DN100 or DN150 nominal bore intake, and accommodates both aqueous and foam concentrate delivery, permitting a solitary hydrant to address Class A and Class B combustion hazards without necessitating an independent foam interface point.
What it is
Reliable Underground Fire Hydrant Solution for Fast and Efficient Fire Response
Durable. Space-Saving. Designed for Reliable Water Supply.
A subterranean fire hydrant is a permanently embedded fire suppression water access point installed beneath the earth's surface. It equips emergency responders with rapid, dependable water availability during combustion incidents. This system is ideally suited for metropolitan zones, manufacturing complexes, storage depots, and expansive infrastructure developments, ensuring unobtrusive surface aesthetics while guaranteeing functional fire suppression water delivery upon demand.
In contrast to surface-mounted hydrants that consume visible terrain and remain vulnerable to vehicular collision or severe meteorological exposure, subterranean variants are housed within subterranean protective enclosures. This concealed positioning mitigates servicing hazards, enhances site visual appeal, and offers superior safeguarding against extrinsic impairment while preserving sustained functional dependability over extended operational lifespans.
Fundamentally, the apparatus interfaces directly with the fire suppression piping infrastructure, channeling pressurized aqueous flow through below-grade discharge ports upon activation by emergency personnel. Fabricated from resilient substances including nodular cast iron and anti-corrosive elements, the hydrant is architected to endure subterranean environmental stresses and sustain consistent functionality amid rigorous fire protection operational demands.
Engineered for longevity and trustworthy emergency intervention, subterranean fire hydrants find extensive deployment across municipal fire distribution grids, industrial zones, production facilities, aviation terminals, maritime harbors, commercial structures, and analogous installations where dependable fire water accessibility combined with space-conservative deployment is mission-critical.
How It Works
Connected to the Fire Water Supply System
Underground fire hydrants are mounted beneath the ground surface and linked to the primary fire water supply network. The entire system stays pressurized and fully operational at all times, guaranteeing instant availability of a dependable water supply for fire suppression operations.
Quick Access Through Underground Outlet
In the event of a fire, firefighters remove the cover of the underground hydrant compartment and attach fire hoses or related equipment to the hydrant's outlet. Its subsurface installation not only offers easy access but also safeguards the unit while maintaining a neat, unobstructed appearance.
Fast Hose Connection and Water Release
When responding to a fire incident, firefighters access the hydrant compartment, attach fire hoses or relevant equipment to the outlet, and activate the hydrant to discharge pressurized water for effective fire extinguishing.
Provides Continuous High-Flow Fire Water Supply
Once put into operation, the underground fire hydrant provides a steady and high-pressure water supply to assist firefighting tasks. Its sturdy structure guarantees dependable performance in municipal, industrial, and commercial fire safety applications.
Technical Parameters
| Item | Specification |
|---|---|
| Standard | GB 4452 (GB Standard) |
| Nominal Inlet Size | DN100 / DN150 |
| Nominal Outlet | DN100 (compatible with standard fire hoses and foam nozzles) |
| Working Pressure | 1.6 MPa |
| Test Pressure | 2.4 MPa |
| Body Material | Ductile Iron QT450 |
| Sealing Material | EPDM |
| Connection Type | Flanged |
| Medium | Water / Foam Mixture |
| Operating Temperature | −25°C to +70°C |
| Frost Protection | Auto-drain valve with air vent |
| Surface Box | Cast iron, supplied as standard |
| Service Life | 15+ years |
| Certification | ISO 9001, CE |
Inlet / Outlet Configuration
| Type | Inlet Size (DN) | Inlet Connection | Outlet Thread | Hose Coupling | Opening Height (mm) |
|---|---|---|---|---|---|
| Single-Outlet | DN100 | Flanged | M125×6 | KWA65 | ≥50 |
| Single-Outlet | DN150 | Flanged | M170×6 | KWA80 | >55 |
| Dual-Outlet | DN100 | Flanged | M125×6 | KWA65 × 2 | >50 |
Note: the table above reflects our best reading of the source parameters provided. Please double-check the inlet/outlet/opening-height pairing against your original spec sheet before publishing - in particular, confirm whether a DN150 dual-outlet (KWA80×2) variant should also be listed.
Above-Ground vs. Underground Fire Hydrants: Which One Fits Your Site?
Fire hydrants are generally installed in one of two configurations - aboveground (pillar-type) or underground (flush-mounted). Each offers distinct advantages depending on the site conditions and operational priorities.
Above-Ground Fire Hydrants
Design: The full hydrant body stands exposed above grade, with outlets and valve stem directly visible and accessible.
Key Advantages:
High visibility - The upright structure allows fire crews to locate the hydrant instantly during emergencies, without needing to search for or uncover a surface box
Faster operation - No need to open a pit cover or access a confined space; hose connection and valve activation happen immediately, critical when every second counts
Simplified maintenance - Routine inspection, repair, and part replacement can be done without excavation or confined-space entry, reducing labor costs
Proven frost resistance - Most models use a dry-barrel valve design, making them well-suited for cold-climate regions
Best suited for: Industrial parks, warehouses and logistics facilities, open roadways, and areas near fire lanes where surface space is not a constraint
Underground Fire Hydrants
Design: The hydrant body is installed within a protective underground pit, with only the access cover flush with the road or pavement surface.
Key Advantages:
Zero surface footprint - Ideal for sidewalks, roadways, and landscaped areas where space is limited and above-ground fixtures are undesirable
Superior impact resistance - Shielded from vehicle collisions and construction equipment, significantly reducing the risk of accidental damage
Discreet, unobtrusive installation - Preserves the visual continuity of urban streetscapes and building frontages, commonly specified for municipal roads and upscale commercial or residential developments
Reduced risk of tampering - The concealed installation limits exposure to vandalism or unauthorized water access
Best suited for: Municipal roads, residential communities, commercial developments, and any high-traffic area where surface space must remain clear
How CA-FIRE Addresses the Traditional Limitations of Underground Hydrants
| Common Underground Hydrant Challenge | CA-FIRE Solution |
|---|---|
| Corrosion from soil moisture and groundwater | QT450-grade ductile iron body for long-term corrosion resistance |
| Damage from vehicle loads or heavy equipment | Cast iron surface box with reinforced protective structure |
| Additional connection needed for foam supply | Dual compatibility with water and foam mixture - one hydrant, two fire classes |
| Slower water access in emergencies | Standardized DN100/DN150 inlet with stable 1.6 MPa working pressure |
Why Choose Us
Reliable Fire Protection Performance
Designed to provide stable water supply and dependable operation during emergency firefighting situations.
Durable Construction Materials
Manufactured with high-quality materials to withstand underground environments and long-term use.
Space-Saving Installation
Underground design keeps the surface area clean while reducing exposure to external damage.
Reliable Emergency Response
Each hydrant is produced under strict quality management to ensure consistent performance and reliability.
Multiple Configuration Options
Available with different inlet sizes, outlet designs, and connection options to meet various project requirements.
Wide Application Experience
Suitable for industrial facilities, municipal networks, commercial buildings, ports, and infrastructure projects.
How It Works
Valve Stem & Actuation Mechanism
The CA-FIRE Underground Fire Hydrant uses a vertical valve stem connected to the main valve assembly at the base of the hydrant. Rotating the stem via the operating nut at the top raises or lowers the main valve, controlling water flow through the barrel. This single-point actuation allows fire crews to open or close the hydrant fully with a standard hydrant wrench, without needing access to the underground chamber itself - only the stem cap at the surface level needs to be reached.
Main Valve Sealing System
Water-tight shutoff is achieved through a compression-type main valve fitted with a synthetic rubber sealing ring (EPDM or NBR, depending on application environment). The sealing ring is designed for long-term elasticity retention, resisting hardening, cracking, or permanent deformation even after extended exposure to underground moisture and temperature fluctuations. This ensures a reliable, drip-free seal over repeated open/close cycles - a critical factor for hydrants that may sit idle for long periods between emergency uses or routine testing.
Automatic Drain (Anti-Freeze Mechanism)
One of the most important features for underground hydrants installed in cold climates is the automatic drain valve. When the main valve is closed, a small drain port at the base of the hydrant automatically opens, allowing residual water inside the barrel to drain out into the surrounding gravel bed rather than remaining trapped inside the pit. This prevents water from freezing and expanding within the hydrant body during winter months, protecting against cracking or valve seizure. When the hydrant is opened again, the drain port automatically closes under water pressure, ensuring full flow is directed to the outlet.
Our address
NO.8, YUANFENG ROAD, MEIYUAN VILLAGE, KANGMEI TOWN, NANAN CITY, QUANZHOU CITY, FUJIAN CHINA
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