1. Fire Hydrant Spacing & Residual Pressure Rules
To guarantee rapid emergency fire protection without relying solely on mobile water tankers, fire hydrants are positioned at mandatory physical intervals across the city:
- Industrial & Chemical Zones: Fire hydrants must be installed along road networks at maximum intervals of 100 meters.
- Commercial & Mixed-Use Hubs: Hydrants must maintain a maximum spacing of 120 meters.
- Residential Townships & Local Streets: Hydrants must be spaced at intervals not exceeding 150 meters.
- 3.5 Bar Minimum Residual Pressure: The municipal water distribution network must maintain a continuous residual pressure of at least 3.5 bar (0.35 MPa) at the highest hydrant outlet during peak demand.
- Red Pillar Type Hydrants: Street hydrants must be dry-barrel or wet-barrel red pillar type hydrants (DN100 or DN150 size) equipped with instantaneous female couplings compliant with IS 908 standards.
2. Dedicated Underground Fire Water Storage
In addition to municipal grid hydrants, private industrial complexes and high-rise commercial developments must install dedicated static fire water storage tanks:
- Exclusive Fire Reserve: Fire water storage tanks must be dedicated exclusively to fire protection. Domestic water suction pipes must be installed above the fire reserve level to prevent depletion of fire water.
- Automatic Jockey & Main Fire Pumps: Static storage systems must feature automatic electric jockey pumps (for pressure maintenance) backed by diesel engine-driven main fire pumps (capacity 2,280 to 4,500 liters per minute) capable of operating during power grid outages.
The table below outlines DICDL fire hydrant network parameters across land use zones:
| Land Use Zone Category | Max. Hydrant Spacing | Min. Residual Line Pressure | Min. Branch Pipe Diameter | Fire Reserve Tank Capacity | Mandatory SCADA Telemetry |
|---|---|---|---|---|---|
| **Residential Township Zone** | 150 Meters | 3.5 Bar (35m head) | DN100 (100mm DI) | 100,000 Liters | Flow/Pressure Sensors |
| **Commercial Retail Hub** | 120 Meters | 3.5 Bar (35m head) | DN100 (100mm DI) | 150,000 Liters | SCADA Connected RTU |
| **General Manufacturing Zone** | 100 Meters | 4.0 Bar (40m head) | DN150 (150mm DI) | 250,000 Liters | Real-Time CEMS Link |
| **Hazardous Chemical Fab Zone** | 75 Meters | 5.0 Bar (50m head) | DN200 (200mm DI) | 500,000 Liters | Dual-Redundant Pump Link |
3. SCADA Pressure Monitoring & Valve Chambers
- SCADA Digital Telemetry: Every major fire water branch loop is equipped with digital pressure transducers connected to DICDL’s ABCD Command Center. Any sudden pressure drop triggers an automated alarm at the nearest Dholera Fire Station.
- Subterranean Valve Chambers: Hydrant isolation valves must be housed in reinforced concrete valve chambers ($1.2\text{m} \times 1.2\text{m}$) fitted with heavy-duty cast-iron manhole covers painted bright yellow for immediate identification.
Frequently Asked Questions (FAQ)
#### What is the maximum allowed spacing for fire hydrants in Dholera’s industrial zones?
Under DICDL fire protection standards, hydrants in heavy industrial zones must be installed at maximum intervals of 100 meters along road corridors.
#### What is the minimum water pressure required at Dholera fire hydrants?
The municipal fire grid must maintain a minimum residual line pressure of 3.5 bar (35 meters head) at all hydrant outlets.
#### Can domestic water supply deplete the fire storage tank in Dholera buildings?
No. DSIRDA building codes mandate that domestic pump suction pipes must be elevated above the fire storage line, ensuring the fire water reserve cannot be drawn for non-emergency use.
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