Fire extinguishing system. Fire cock
To protect from fire of various buildings orinstallations, install fire water pipes. Inside the task is equipped with a fire cock, to which the fire water supply is connected. According to the requirements of SNiPP-30-76, fire water pipes with fire valves are installed in residential multi-storey buildings.
The fire truck is equipped with:
- a fire valve with a diameter of fifty or sixty millimeters, connected to the riser branch;
- a hose (hemp hose) with a length of 10-20 m;
- Quick-closing pologankami;
- a fire barrel with a spray (tip) with a diameter of 13 mm, (and may also be 16, 19, 22 mm in diameter).
The fire cock is placed at a level of 1.35 m fromplinth in special lockers with the inscription "PC". The paired cranes are placed one above the other at a distance of one meter above the skirting board. Like all fire fighting equipment, the location of these items is indicated on the fire safety plan. A special sign is placed next to it: a white fire cock on a red box.
If there are more fire water pipes in the networktwelve fire hydrants, they are looped and connected to the networks by two or more inputs. The number of products is determined by the irrigation area of all premises in the building. The operating radius of the crane is calculated by the formula: R = L1 + L2,
where R is the radius of impact of the fire cock,
L1 - length of the hose (hose) of the fire cock;
L2 is the level of the compact part of the jet, equal tothe height of the room in which the fire cock is installed, but not less than six meters in buildings whose height does not reach 50 m, and at least eight meters in buildings with a height of more than 50 m.
Table 1. Lowest water consumption for fire fighting inside the building
| Buildings and premises | Lowest water consumption per crane, l / s | Number of fire-fighting cranes per floor | |
| Residential buildings | The length of the corridor is up to 10 m, the number of floors is 12-16 | 2,5 | 1 |
| The length of the corridor is more than 10 m, the number of floors is 12-16 | 2,5 | 2 | |
| The length of the corridor is up to 10 m, the number of floors is 16-25 | 2,5 | 2 | |
| The length of the corridor is more than 10 m, the number of floors is 16-25 | 2,5 | 3 | |
| Management buildings | The volume of the building is up to 25,000 cubic meters. Number of floors 6-10 | 2,5 | 1 |
| The volume of the building is over 25,000 cubic meters. Number of floors 6-10 | 2,5 | 2 | |
| The volume of the building is up to 25,000 cubic meters. m, number of floors is more than 10 | 2,5 | 2 | |
| The volume of the building is over 25,000 cubic meters. m, number of floors is more than 10 | 2,5 | 3 | |
| Public buildings and dormitories | The number of floors to 10, the volume of the building is 5000-25000 cubic meters. m. | 2,5 | 1 |
| The number of floors is up to 10, the volume of the building is over 25,000 cubic meters. m. | 2,5 | 2 | |
| The number of floors is more than 10, the volume of the building is 5000-25000 cubic meters. m. | 2,5 | 2 | |
| The number of floors is more than 10, the volume of the building is over 25,000 cubic meters. m. | 2,5 | 3 | |
| Administrative and household buildings of industrial | The volume of the building is 5000-25000 cubic meters. m. | 2,5 | 1 |
| The volume of the building is over 25,000 cubic meters. m. | 2,5 | 2 | |
The radius of impact of the fire cock should not beless than sixteen meters (buildings below 50 m) and twenty-six meters (buildings above 50 m). On the floor, fire hydrants are installed in such a way that any point in the room can be irrigated with jets of at least two devices. The number of simultaneously functioning fire hydrants and the lowest water consumption can be seen in Table 1.
With simultaneous use of instruments,one riser can be installed with a twin cock. The fire valve is mounted with a diameter of 50 mm. One jet of water requires 2.5 l / s or 5 l / s, the number of jets acting together should not exceed eight.
