Fire Hydrant (Above-Ground • Underground)
For outdoor fire water supply, hydrants offer high flow, a rugged body and easy access to accelerate firefighting operations. Depending on project needs, choose above-ground or underground types. Safety details such as breakable bolts, drainage and freeze protection ensure long service life and continuity.
Above-Ground or Underground?
Choose according to site layout, traffic load and aesthetic/infrastructure constraints.
| Type | Application | Advantages | Considerations |
|---|---|---|---|
| Above-Ground | Campuses, industrial sites, large outdoor areas | Quick connection; visible and easy to access | Use breakable bolts against vehicle impact |
| Underground | High traffic, aesthetic priority | No surface obstruction; lower vandalism risk | Requires key/standpipe and cover management |
Selection Guide: Flow, Size and Connections
Select by flow requirement, DN size, outlet coupling (e.g., Storz), pressure class (PN), and drain/freeze protection.
| Scenario | Recommended Type | Outlet / Coupling | Note |
|---|---|---|---|
| Industrial yard / trunk line | Above-Ground DN100 | 2×Storz + 1×top outlet | High flow; PN16 typical |
| Campus roads / heavy traffic | Underground DN80–DN100 | Storz (German type) | Cover & key management; drainage is critical |
| Cold climate / open area | Freeze-resistant | Storz | Internal body drainage; optional barrel extensions |
Technical Specifications & Standards
Values are typical and may vary by brand/model and specification.
| Item | Value / Option | Description |
|---|---|---|
| Size | DN80 / DN100 (typical) | Choose to match required flow |
| Nominal Pressure | PN 16 (typical) | Verify with system calculations |
| Body | GJS (ductile iron) | Epoxy coated; UV & corrosion resistance |
| Sealing | EPDM / NBR | Select by temperature/medium |
| Drainage | Automatic internal | Critical against freezing |
| Connection | Flanged (PN16) | Match water-main flange |
| Standards | TS EN 14384 / TS EN 14339 | Above-ground / underground respectively |
Maintenance & Periodic Checks
For reliable response, perform the following checks:
| Interval | Action | Description |
|---|---|---|
| Monthly (visual) | Cover, vandalism, coating | No access obstruction; signage visible |
| Every 6 months | Functional / drainage | Connections & sealing; verify drain function |
| Annually | Flow/pressure test | Record results; inspect breakable bolts |
Frequently Asked Questions
How do I protect against freezing? ▾
Choose freeze-resistant bodies with automatic internal drainage; before winter, check the drain line and area around the cover.
Is there a minimum clearance around hydrants? ▾
Keep at least ~1 m of clear space for vehicle approach and maneuvering; coordinate curb/parking boundaries per project.