Fire Hydrants
Fire Hydrants are fixed water-supply points connected to the main pressurized water network, providing a high-flow source for civil defense teams and fire systems. They split into two main types: wet barrel and dry barrel. Installed outdoors around large buildings, factories, storage facilities, and residential districts.
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Fire hydrants are the backbone of fire water supply at large sites. The design: a cast-iron or high-strength steel body standing above ground connected to a buried main pipe (typically 150-200 mm diameter), with 2-4 outlets at standard diameters (2.5", 4", 5"), a main control valve, and a protective cap. Types: wet-barrel hydrants where the pressurized water column rises to the top at all times, so any outlet opens immediately — suitable for areas that stay above freezing; dry-barrel hydrants where the above-ground column is kept empty and the main valve sits below ground under the frost line, so it is opened first and then water flows — essential in cold climates. Standard color codes per NFPA 291: red (Class C: below 500 gpm), orange (Class B: 500-999 gpm), green (Class A: 1000-1499 gpm) and light blue (Class AA: 1500 gpm or more), applied to the bonnet and nozzle caps. Applications: large factories, storage facilities, large educational facilities, residential districts, refineries, and airports. Typical flow: 500-5000 lpm depending on network size. Supply pressure: 4-7 bar at rest, 2-5 bar flowing. A technical note: installation requires a hydraulic study to confirm adequate pressure and flow; hydrant spacing is 60-150 m based on hazard density. Maintenance: annual inspection and annual flow test to confirm no blockage. Specifications follow NFPA 24, AWWA C502, EN 14384 (pillar hydrants), and EN 14339 (underground hydrants).
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Fire hydrants are the backbone of fire water supply at large sites. The design: a cast-iron or high-strength steel body standing above ground connected to a buried main pipe (typically 150-200 mm diameter), with 2-4 outlets at standard diameters (2.5", 4", 5"), a main control valve, and a protective cap. Types: wet-barrel hydrants where the pressurized water column rises to the top at all times, so any outlet opens immediately — suitable for areas that stay above freezing; dry-barrel hydrants where the above-ground column is kept empty and the main valve sits below ground under the frost line, so it is opened first and then water flows — essential in cold climates. Standard color codes per NFPA 291: red (Class C: below 500 gpm), orange (Class B: 500-999 gpm), green (Class A: 1000-1499 gpm) and light blue (Class AA: 1500 gpm or more), applied to the bonnet and nozzle caps. Applications: large factories, storage facilities, large educational facilities, residential districts, refineries, and airports. Typical flow: 500-5000 lpm depending on network size. Supply pressure: 4-7 bar at rest, 2-5 bar flowing. A technical note: installation requires a hydraulic study to confirm adequate pressure and flow; hydrant spacing is 60-150 m based on hazard density. Maintenance: annual inspection and annual flow test to confirm no blockage. Specifications follow NFPA 24, AWWA C502, EN 14384 (pillar hydrants), and EN 14339 (underground hydrants).
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