Design of fire extinguishing system of parkland with finely dispersed water

1. Common part.

This work project is executed on the basis of the contract. The developed solutions comply with the requirements of the norms and rules of the Russian Federation (list on sheet 2).

The project provides for the equipment of parking facilities located at the address: St. Petersburg, Krasnogvardeisky district, Novocherkassky Ave., 35, lit. A, D, automatic fire extinguishing plant with finely dispersed water (AUPT).

The initial data used are:

• Architectural construction project

• Specification for the design of fire-fighting units with application of water sprinklers "AquaGefest."

• Specification of PMT "Vodokanal of St. Petersburg" No. 51/ 112110228/0701 of the year 25.09.2007, for the permitted flow rate for automatic fire fighting needs 10.8 l/s.

2. Characteristics of protected premises.

Parking rooms to be protected are located at elevations -1.000 m and -0.350 m of a residential building with built-in rooms.

The fire resistance of the building is II.

Ventilation - mechanical,

The protected area is 5375.5 m2.

Parking rooms are made of monolithic reinforced concrete.

Temperature in protected rooms - not more than + 50 С, humidity - not more than 80%.

Ventilation in protected rooms - mechanical plenum.

The main fire load is cars.

Parking spaces with auxiliary rooms are separated from the rest of the building by fire walls and floors of the 1st type, in addition, the parking lot is divided by fire walls of the 1st type into fire compartments, according to the requirements of SNiP 210299.

Parking rooms are equipped with smoke removal units.

Room with personnel on 24-hour duty is located on the ground floor.

4. Installation instructions.

Installation shall be carried out in accordance with the "Work Execution Project" performed by the installation organization in accordance with VSN 25 09.66-85 "Rules for the development of work execution projects for the installation of automatic fire extinguishing units and safety, fire and fire alarm units."

SNiP 3.05.0185 "Internal Sanitary and Technical Systems," VSN 2509.67-85 "Rules of Work Execution and Acceptance" shall be used during installation, adjustment, testing and commissioning. Automatic fire extinguishing installations, "Ministry of Industry," Manual "to these rules and methodological recommendations" Automatic fire extinguishing and fire alarm systems. Acceptance and Control Rules, "GOVD of the Russian Federation (SU GPS, VNIIPO), M.99.

The maximum distance between sprinklers is 3 meters.

Distance from center of heat-sensitive element of sprinkler lock

sprinkler to the floor plane (coating) must be within the range of 0.08 to 0.30 m

Ventilation ducts with a width or diameter of more than 0.75 m, located at a height of not less than 0.7 m from the floor plane, are additionally equipped with sprinkler sprinklers under air ducts.

In the process transition and in places where there is a danger of mechanical damage to irrigators, they should be protected by special enclosing devices that do not worsen the intensity and uniformity of irrigation.

The distance between sprinkler sprinklers is at least 1.5 m (horizontally).

Pipelines of the fire extinguishing plant made of steel galvanized pipes according to GOST 10704 - with welded and flange connections, according to GOST 3262 - with threaded connections.

AFC feed pipelines are equipped with flushing plugs with ball valves DN 50;

Provide air discharge from upper points of sprinkler sections through DN15 valves.

Supply and distribution pipelines of the units shall be sloped

towards the control unit or drain devices equal to not less than:

- 0.01 for pipes with nominal diameter less than DN 50;

- 0.005 for pipes with nominal diameter DN 50 or more.

Corrosion protection shall be provided for pipelines and auxiliary metal structures for attachment of pipelines and equipment.

Identification painting or digital designation of pipelines shall comply with GOST R 12.4.026 and GOST 14202:

• water-filled pipelines of sprinkler, deluge AUP - green color or digit "1."

Signal painting in areas of piping connection with shut-off and regulating

devices, units and equipment - red color.

At the end of installation, all APM pipelines shall have a digital or alphanumeric designation as per hydraulic diagram.

The distinctive color of the marking boards indicating the direction of movement of the extinguishing agent is red. Marking boards and numerical or alphanumeric designation of pipelines shall be applied taking into account local conditions in the most critical points of communication (at the inlet and outlet of fire pumps, at the inlet and outlet of the common piping, at branches, at connection points, at shut-off devices, through which water is supplied to the main, supply and supply pipelines, at points of pipeline passage through walls, partitions, at building inputs and in other places necessary for identification of ACS pipelines).

Pipe attachment units with nominal diameter not more than DN 50 shall be installed

with a pitch of not more than 4 m. For pipes with a nominal diameter of more than DN 50, it is allowed to increase the pitch between attachment units to 6 m.

Distance from holder to last sprinkler on distribution pipeline

for pipes of nominal diameter DN 25 and less shall be not more than 0.9 m, and over DN 25 - not more than 1.2 m.

Taps on distribution pipelines more than 0.9 m long shall be attached by additional holders; the distance from the holder to the sprinkler on the branch shall be:

- for pipes of nominal diameter DN 25 and less - 0.15 - 0.20 m;

- for pipes of nominal diameter more than DN 25 - within the range of 0.20 - 0.30 m.

In case of piping laying through sleeves and slots of building structures distance

between support points shall be not more than 6 m without additional anchorages.

Pipeline passages through enclosing structures shall be sealed in cases when, under operating conditions, adjacent rooms shall not communicate with each other.

APM equipment (except for sprinklers, measuring instruments and pipelines)

according to GOST 12.4.009, GOST R 12.4.026, GOST R 50680 and GOST R 50800 should be painted red.

Fire pump units and modular pump units shall be installed

on the foundation, the mass of which should not be less than 4 times the mass of pump units or modular pump units.

Pump units and control units according to GOST 12.4.009, GOST R 12.4.026,

GOST R 50680, GOST R 50800 and GOST R 51052 shall be painted red.

5. Principle and procedure of plant operation.

In standby mode, the distribution pipeline of the sprinkler unit is filled with water, and are under the pressure of the pressure increase unit 60 ppm.

The pressure in the supply pipeline is monitored by an electric contact pressure gauge, which includes a pressure maintaining pump. If a fire occurs in protected rooms, the temperature rises to the temperature of destruction of the heat lock of the sprinkler, one or more sprinklers located above the fire center are opened. Water through the opened sprinkler irrigates the fire. When the water pressure in the supply line drops, the signal valve opens, one or two PS10 pressure sensors operate, which include the "Fire" signal and the main pump. If the main pump has not reached the design pressure within 10 seconds, the standby pump from the pressure switch installed on the main pump pressure pipe is automatically switched on. The flow indicator of the branch where the fire occurred operates from the water flow in the supply pipeline.

Command signal is provided for:

- shutdown of ventilation;

- activation of the warning system;

- disconnection of elevators.

Operation of the plant is stopped by closing the gate valve at the control unit in the sprinkler center and disconnecting the power supply of the working pump.

With the completion of work on the elimination of the consequences of the fire, it is necessary to restore the operability of the plant. To do this, the opened sprinklers are replaced with new ones provided in the reserve, and the irrigation network is filled with water.

Detailed description of the plant elements operation is given in the equipment documentation.

6. Automatic fire extinguishing. Fire fighting automation.

In this part of the project it is envisaged to equip the automatic fire extinguishing unit with instrumentation.

The design is based on the requirements of sanitary standards and safety.

The equipment is located in the premises of the pump station and on-duty personnel with round-the-clock work.

Automation Solutions

The process monitoring and control system provides:

• Control over parameters;

• Prevention and prevention of emergency situations.

Selection of monitoring devices

Pressure control is performed on pressure lines of pumps N1, N-2, N-3 of control units.

For pressure monitoring, electric contact pressure gauges DM2020 are used, for pressure signalling - universal pressure switches PS102A.

Automatic control

The project provides for:

• Automatic actuation of N-1 working pump at actuation of 2 contacts of pressure sensors: PS102A;

• Automatic activation of N-3 pumping pump at pressure drop in sprinkler sections less than design one and shutdown of N-3 pump at reaching design pressure in sections;

• Automatic shutdown of N-3 pumping pump when one of N-1 or N-2 pumps is switched on;

• Actuation of standby N-2 pump by pressure drop on the pressure pipeline in case of N-1 failure within 10 seconds;

• Activation of the alert system;

• Output of signals for disconnection of general ventilation;

• Activation of fire water system pumps;

• Opening of electric valves on the bypass line of the domestic water supply system;

• Control of smoke removal and overpressure systems in case of fire.

Automatic alarm

The project provides for:

• "Fire" alarm at actuation of water signal valves with decryption of the operated direction;

• Signalling of main or standby pumps activation;

• Alarm of N-3 leak compensation pump activation;

• Signalling of main and standby power supply on boards circuits and control devices;

• Alarm "FAULT" in case of failure of any of the instruments and control circuits.

Installation of instruments.

Installation and installation of instruments in the pump station room shall be carried out according to the installation instructions of the manufacturers taking into account safety precautions and "PUE," NPB882001 *, SNiP 3.05.0685, RD 78,14593.

Cables shall be laid according to external wiring diagrams.

Receiving equipment and cable gaskets.

The set of devices for management of installation of automatic water fire fighting of VestKom (SPb) of the PUI02SM1 type installed in protection with the round-the-clock finding of personnel on duty is used to reception of signals from devices of a system of automatic water fire fighting.

With regard to reliability of power supply by PUE, all equipment of the automatic fire extinguishing unit belong to the first category of power supply.

All motors are supplied complete with drive mechanisms.

Power supply of starting equipment of electric motors is provided by IWGng cable, instruments and light indicator "Fire extinguishing station" and "Fire engines connection place" - by 2x0.75 IWVP cable in metal box, other communication lines between devices - by CQR cable. To protect cables from mechanical damage when laying a cable below 2.2 m from the floor, the cables must be mechanically protected.