Completed the development project and installation systems of the internal fire-fighting water supply of the ERW in the industrial laboratory building in Moscow.

ERW SYSTEM DESIGN

To effectively solve the problems of extinguishing a fire, an internal fire extinguishing system must meet a number of requirements of regulatory and governing documents that determine the composition, quantity and location of fire fighting equipment.

When developing the project for the internal fire-fighting water pipeline of the Research Institute building, the requirements of the following regulatory documents were taken into account:

1. SNiP 2.04.01-85*. Internal plumbing and sewerage of buildings. - M.: Stroyizdat, 1996;

2. SNiP 2.04.02-84*. Water supply. External networks and structures. Ministry of Construction of Russia - M .: GPTsPP, 1996;

3. SNiP 31-05-2003. Public buildings for administrative purposes;

4. SNiP 21-01-97*. Fire safety of buildings and structures;

5. PPB-01-03. Fire safety rules in the Russian Federation. - M.: Infra-M, 2003;

6. Designer's Handbook. Internal sanitary facilities. Part 2. Water supply and sewerage. - M.: Stroyizdat, 1990;

7. NPB 151-2000. Fire cabinets. - M .: State Fire Service of the Ministry of Internal Affairs of the Russian Federation, 2001;

8. NPB 152-2000. Fire fighting equipment. Fire pressure hoses. - M .: State Fire Service of the Ministry of Internal Affairs of the Russian Federation, 2001;

9. NPB 153-2000. Fire fighting equipment. Heads connecting firefighters. - M .: State Fire Service of the Ministry of Internal Affairs of the Russian Federation, 2001.

10. NPB 154-2000. Fire fighting equipment. Fire hydrant valves. - M .: State Fire Service of the Ministry of Internal Affairs of the Russian Federation, 2001;

11. NPB 177-99. Trunks fire manual.

12. SNiP 11-01-95. Instructions on the procedure for the development, approval, approval and composition of project documentation for the construction of enterprises, buildings and structures. M.: 1995;

13. PUE-98. Rules for the installation of electrical installations.

2. LIST AND CHARACTERISTICS OF PREMISES PROTECTED BY APT.

Administrative, laboratory and utility rooms belonging to group F 4.3 for functional fire hazard are subject to protection by internal fire water supply (clause 5.21 * SNiP 21-01-97 *). The building is fire resistance class II, CO class constructive fire hazard. The building is five-story with an attic and a basement, with a volume of 20,000 m3.

The premises are heated.

3. PURPOSE OF THE INTERNAL FIRE-FIGHTING WATER SUPPLY SYSTEM.

The water fire extinguishing system includes an internal fire network with fire hydrants and a fire pump station.

The arrangement of fire hydrants should provide irrigation of any point of the protected premises with one water jet with a flow rate of at least 2.5 l / s.

4. HYDRAULIC CALCULATION OF INTERNAL FIRE FIGHTING WATER PIPE.

In accordance with clause 6.1* and Table 1* of SNiP 2.04.01-85*, since the volume of the research institute building is less than 25 thousand m3, 1 jet with a water flow rate of at least 2.5 l / s should be taken for internal fire extinguishing of the premises . Based on the standard flow rate and the number of fire jets determined in accordance with regulatory documents, the total water consumption for internal fire extinguishing will be: Qin. = 1 qres. = 1 ´2, 5 = 2.5 l/s.

It is proposed to equip the water supply network with fire hydrants with a diameter of 50 mm, RS-50 fire nozzles with nozzle diameters of 13 mm, fire hoses 20 m long and 51 mm in diameter. In accordance with clause 6.8 of SNiP 2.04.01-85 *, free pressure at internal fire hydrants should provide compact fire jets with a height necessary to extinguish a fire at any time of the day in the highest and most remote part of the building. The smallest height and radius of action of the compact part of the fire jet should be taken equal to the height of the room, counting from the floor to the highest point of overlap (coverage), but not less than 6 m for public buildings up to 50 m high.

At the same time, in accordance with Table 3 of SNiP 2.04.01-85 *, with the actual value of the compact part of the fire jet R k. = 12 m, the water consumption will be 2.6 l / s, and the required pressure at the fire hydrant will be Npk. = 21 m. The radius of the fire hydrant R kr. for the premises of the research institute building, fig. 4.1., will be:

R cr. \u003d R pr.k. + l p,

where: R pr.k is the projection of the compact part of the jet onto the horizontal plane, m;

T - the height of the room (T = 2.6 m for the basement of the building, T = 3.6 m for the above-ground rooms of the building);

l p - length of the fire hose, m;

1.35 - the height of the fire hydrant, m.

The angle of inclination of the fire barrel, °.

Taking into account the height of the room, the radius of action of the fire hydrant in the basement of the building will be equal to R cr under. \u003d 25.9 m, in the above-ground premises of the building - R cr above. = 25.5 m.

With this value of Rk, it is required to install 15 fire hydrants in the premises of the research institute building, taking into account its layout.

Since the total number of fire hydrants in the research institute building is more than 12, the main network is designed as a ring and is fed by two inputs from the external water supply network.

From the calculated axonometric diagram of the internal fire water supply network for fire hydrants located on the attic floor of the research institute building, fig. 4.2, it can be seen that the direction of water movement from the fire pump to the PK-14 tap (dictating point) should be taken as the design direction.

We determine the diameters of the riser pipes to pass the estimated water flow rates, taking into account the economic speeds of water movement (V), which should not exceed 3 m / s.

Pipe diameters are determined by the formula:

Taking as the calculated value of the speed of water movement V = 2 m / s, for the risers and the ring of the internal fire water supply network of the internal fire water supply network we get:

We accept for the calculation of pipes, taking into account their long-term future operation, "non-new steel" with a diameter of 50 mm.

The diameter of the supply pipelines (from fire pumps to the internal ring fire water supply) is accepted d pit. = 80 mm.

Determine the required pressure of the fire pump:

Ntr. pl. \u003d 1.1 h c + Hpk + Δz - Hb.,

where: h c - pressure loss in the internal fire water supply network;

Npk - free pressure at the dictating point (at the fire hydrant PK-14);

Δz is the difference between the marks of the installation of the PK-14 fire hydrant and the axis of the pump;

Hsv. = 10 m - free pressure in the external water supply network at ground level (elev. 0.00).

Since the fire hydrant with the dictating point is set to elev. 20.67 m, and the pumping station is located at el. 0.00 then:

Δz = 20.67 m.

As follows from the results of calculating the pressure loss in the network in the calculated direction (PK-18 - NS) will be:

h c \u003d h PC-14 - 1 + h 1-2 + h 2-3 + h 3-NS \u003d 1.65 + 1.95 + 0.52 + 0.49 \u003d 4.61 m,

where: h PK-14 - 1 = A50 L PK-14 - 1 Q 2PK-14 = 0.01108 22 2.62 = 1.65 m;

h 1-2 \u003d A50 L 1-2 Q 2PK-14 \u003d 0.01108 26 2.62 \u003d 1.95 m,

h 2-= A50 L 2-3 Q 2PK-14 = 0.01108 7 2.62 = 0.52 m,

h 3-HC \u003d A80 L 3-HC. Q 2PK-14 \u003d 965.6 75 0.00522 \u003d 0.49 m,

where: A50 = 0.01108 (s/l)2; A80 = 965.6 (s / m3) 2 - specific resistance of pipes with a diameter of 50 and 80 mm.

The main indicators of the project are presented in Table. 4.1.

Table 4.1

Whence the required pump head will be equal to:

Ntr. pl. \u003d 1.1 4.61 + 21 + 20.67 - 10 \u003d 36.74 m.

To ensure the protection of the premises with one water jet with a flow rate of 2.6 l / s and to create the required pressure at fire hydrants, it is necessary to install two pumping units (1-n main and 1-n standby) brand CR 15 - 3 with 3 kW electric motors, providing flow 10 m3/h (2.8 l/s) and head 40.0 m.

5. DEVICE AND PRINCIPLE OF OPERATION OF THE INTERNAL FIRE FIGHTING WATER SUPPLY.

Fire hydrants should be installed at a height of 1.35 m above the floor of the room and placed in cabinets with openings for ventilation, devices for their sealing and visual inspection without opening. The source of water supply for the internal fire water supply system is the city water supply network.

The internal fire-fighting water supply should be made in the form of a ring network of pipelines and operated in heated premises of a public and administrative building. Start buttons for starting fire pumps and opening the electric valve on the bypass line of the water metering unit are installed in fire cabinets. When remotely turning on fire pumps and electric valves, it is necessary to simultaneously give a signal (light and sound) to the fire station room or other room with a round-the-clock presence of service personnel.

When you press the start button (turn on the fire pumps and open the electric valve) and open the fire valve, water under excess pressure (pressure determined by calculation) will ensure fire extinguishing of any room in the building with the calculated number of jets. The fire pumps are switched on manually from the pump control panel in the fire pumping station and remotely from the buttons installed in the fire cabinets. When the working pump does not reach the design mode from the EKM installed on the pressure line of the main pumping unit, the backup pump is automatically turned on. All pipelines are made of steel electric-welded pipes in accordance with GOST 10704-91.

6. SELECTION OF FIRE PUMP STATION EQUIPMENT.

The equipment was accepted in accordance with the requirements of SNiP 2.04.01-85*, SNiP 2.04.02-84* and performed calculations. As pumps for the internal fire water supply, two pumping units (one working and one standby) brand CR 15 - 3 with electric motors with a power of 3 kW, providing a supply of 10 m3 / h (2.8 l / s) and a head of 40.0 m, are accepted. To remove spilled water, a drainage pump GNOM 10/10 with a 1.1 kW electric motor is used.

7. CALCULATION OF THE NUMBER OF SERVICE PERSONNEL.

Plumber (repairman) of the 4th category - 1 person.

Electrician of the 4th category - 1 person.

The calculation was made according to RTM 25.488-82.

8. SAFETY REQUIREMENTS FOR OPERATION OF FIRE EXTINGUISHING PUMP INSTALLATIONS.

Service personnel are allowed to work after passing the safety briefing with a corresponding note in the log.

The following rules must be observed during the operation of the installation:

1. Repair work should be carried out in the absence of pressure in the repaired unit.

2. Repair work on electrical equipment should be carried out after a power outage.

3. All work at heights must be carried out with at least two people, with safety equipment provided.

4. Cleaning and painting should be carried out when the voltage is removed from the nearest current-carrying elements.

5. During repair work, if necessary, portable lamps with a voltage not higher than 12V should be used.

9. REQUIREMENTS OF FIRE SAFETY RULES ON ISSUES OF FIRE-FIGHTING WATER SUPPLY.

According to paragraph 92 of PPB 01-03, a general fire water supply scheme and a pump piping scheme should be posted in the pumping station. On each valve and fire booster pump, their purpose must be indicated. The order of switching on booster pumps should be determined by the instructions.

According to clause 1.2 and table 3 of NPB 160-97, fire safety signs must be installed at the remote start buttons.

EXERCISE

for construction work

For internal fire water supply systems, perform:

1. The depth of the pipes of the external sections of the water supply network (inlet to the building) from the surface of the earth to the axis of the pipe is at least 1.90 m.

2. Make holes in the walls and ceilings of the building for laying pipes for the internal fire water supply.

In the fire pump station, do the following:

1. Foundations for pumping units CR 15 - 3, unit weight - 52 kg.

2. Make holes in the walls of the pumping station for laying pipes for the internal fire water supply.

3. To remove possible spilled water, make a drainage pit measuring 600x600x600 mm.

EXERCISE

for the design of power supply for fire pumps

According to the degree of reliability of power supply, fire extinguishing installations are consumers of category I.

It is necessary to supply two independent power inputs to the fire pump control cabinet - working input No. 1, reserve input No. 2, voltage 380/220 V, frequency 50 Hz, power 3 kW each.

Working input No. 3 and reserve input No. 4 with a voltage of 220 V, a frequency of 50 Hz, a power of 0.5 kW for the ShZ-1 electric valve control cabinet.

Technical requirements

Lay the reserve and working inputs along separate routes isolated from one another, in accordance with SN 174-75 p.11-17.

In the pumping station room, provide: working, emergency and repair lighting (illumination from working lighting 75 lux, voltage 220 V; illumination from emergency lighting at least 10 lux; maintenance lighting voltage 12 V), as well as telephone communication with the fire station.

Above the entrance to the pumping station there should be a light board "Fire extinguishing station".

EXERCISE

to protective earth

All metal parts of electrical equipment that are not normally energized, but which may be under it due to insulation failure, are subject to grounding (zeroing). Grounding (zeroing) is subject to: electric motors, terminal boxes, switching cabinets, control panel and control panel of dispatching personnel.

Protective grounding (zeroing) resistance should be no more than 4.0 ohms.

Grounding (zeroing) must be performed in accordance with the "Electrical Installation Rules" (PUE); SNiP 3.05.06-85 "Electrical devices"; requirements of GOST 12.1.030-87 and technical documentation of manufacturers of components.

Drawings will be made available for download upon request.

Internal fire water supply (IRW) is a complex system of pipelines and auxiliary elements installed to supply water to fire dampers, primary fire extinguishing devices, dry pipe fire locks and stationary fire monitors.

ERW provides fire safety inside public buildings. In accordance with regulatory requirements, the ERW must either be installed mandatory or not installed at all.

The structure of the project documentation of the VPV

The design documentation of the ERW includes the following sections:

1. Explanatory note with a list of the equipment used, its characteristics, and a description of the mechanism of operation of the ERW system.
2. Plans for each floor of the facility, showing the placement of equipment, fire cabinets and piping network layout.
3. Hydraulic calculation of the ERW system, which determines the water flow and pressure at the outlet of fire hydrants.
4. Axonometric piping layout.
5. Plan of the pumping station.
6. Electrical diagram for connecting devices.
7. Specification of equipment and materials.

Also, the design documentation of the ERW includes methods for checking and testing the ERW during service maintenance, technical regulations, and the calculation of the number of maintenance personnel.

Design stages

Fire-fighting internal plumbing can be of two types:

• a multifunctional system connected to the household water supply and designed to meet household needs and extinguish a fire if necessary;
• an independent complex of pipelines and technical means, which is mounted over the entire area of ​​the building and works automatically.

In order for ERW equipment to work effectively, it is necessary to pay special attention to the central stages in the design:

• Determining the number of jets produced and the water flow in them. This takes into account the fact that at least two jets from adjacent risers should fall on each point of the room. Therefore, after calculating the number of jets, the number of fire risers and their locations are determined.
• Designing the layout of pipeline networks. In buildings with five or more floors, equipped with fire-fighting plumbing, two-way water supply must be provided. Therefore, risers and taps with water intake risers are looped. Autonomous ERW systems, if appropriate, are connected in an emergency by jumpers to other water pipes.

The development of an ERW project, drawing up drawings and calculations is a laborious process with many nuances and complexities, which only a professional designer can do.

Requirements for the design of ERW

The internal fire water supply should provide automatic operation of the pumps when the fire cock is opened and manual control of the control room or pumping station, as well as from manual fire detectors mounted inside fire cabinets.

The method of supplying water to the water supply system, the number of inputs to the building, the water consumption and the number of fire hydrants are established taking into account the architectural and planning features of the object.

In the ERW, combined with the utility and drinking system, pipes, fittings, materials and coatings must have a sanitary and epidemiological conclusion, and the water quality must meet hygienic standards.

Water consumption and the number of fire hydrants simultaneously used in extinguishing a fire depend on the type and purpose of the building, the number of storeys, the fire hazard category, the degree of fire resistance and the class of constructive hazard.

Electrical parts and pipelines of the VPV must be grounded in accordance with GOST 21130 and PUE. If technological installations with a voltage of more than 0.38 kW are located in the coverage area of ​​fire cabinets, then manual fire nozzles are also grounded.

The list of legislative requirements for the design of ERW is regulated by the Joint Venture “Fire protection systems. VPV".

Availability outdoor fire water pipeline a prerequisite for the safe functioning of a building or organization as a whole. It is arranged on the territory of an organization or settlement and is usually combined with household water supply. As a rule, it consists of low pressure pipelines that can provide water flow from 10 to 35 (40) l / s. depending on the fire resistance class, the height of the building and its volume . Design of an external fire water pipeline carried out in accordance with SNiP 2.04.01-85 (section 12) and SNiP 2.04.02-84. In accordance with these standards, the following types of buildings and structures must be equipped with such a fire system:

• Residential buildings with more than 12 floors;
• Public entertainment facilities - cinemas, stadiums, clubs, conference halls;
• Buildings of departmental administrations with a height of more than 6 floors;
• Buildings for public use and all types of hostels;
• The vast majority of types of storage facilities, including some open storage areas;
• Industrial buildings and structures with fire safety class B, D and D. with an area of ​​​​more than 1000 m 2.

Outdoor fire water distribution system

Important! For settlements with a population of less than 50 people and low-rise buildings, such a water supply system is not provided.

According to JV outdoor fire water supply must provide a minimum head of 10 m for one-story buildings and structures at maximum household consumption. For each subsequent floor, 4 m are added.

The composition of the external fire water supply

A key element of the external fire water pipeline is a fire hydrant (GH). It is installed along the access roads closer than 2.5 m from the border of the carriageway, but not closer than 5 m from the walls of buildings and structures. An access road with a width of at least 3.5 m must be provided for the SG. At the location of the SG, a sign must be installed at a height of 2-2.5 m in accordance with the standards of GOST 12.4.026-76.

Connection to the SG water supply

A fire column with a hydrant is a device for water intake, which is mounted in the water supply network and is designed to supply water when extinguishing a fire. At checking the external fire water supply, which must be carried out twice a year, the technical parameters of the SG must comply with the following standards:

• The provided working pressure (in mega pascals MPa) with a nominal diameter of 125 mm must be at least 1 MPa.
• The frequency of rotation of the opening device (rod) is not more than 12-15 revolutions, while the applied force should not exceed 150N or 15 kg.
• The weight of the fire column is not more than 80 kg.

In addition to SG, fire-fighting reservoirs of the appropriate volume are used as external fire-fighting sources in accordance with SNiP 2.04.02-84 paragraphs 2.13.-2.17. they are located within a radius of 200 m from the serviced buildings in the presence of car pumps or 100-150 m in the presence of motor pumps.

fire reservoir

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A fire-fighting water supply system is a specialized structure, which consists of wide pipes in which the network pressure is increased, which makes it possible to quickly connect fire extinguishing equipment, regardless of the height of the building. The main task of the fire water supply is considered to be the supply of water in the event of any fire.

Projects of fire water supply systems are made by specialized companies in which technologists develop projects taking into account the norms of the law and the wishes of the customer.
After the engineer inspects the object, he agrees on the tasks that are set for the fire water pipeline, and only then proceeds to the development of the initial document, which is ultimately agreed with the client. The design work is to create a thorough plan that will indicate: the location of the water supply, the specification of the equipment and the work schedule for the installation.
The standard project consists of the outer and inner parts of communications. Outside, in specially designed cabinets, water intake columns are installed, to which fire hoses are connected directly from the outside. The internal part consists of a large number of nodes and wiring, but this depends on the height and plan of the object.

Life, health and safety of people depend on many factors. In the event of a fire in a room not equipped with fire fighting equipment and without a developed plan for the evacuation of people and property, much will depend on accidents and trifles. In the event of a fire, personal protective equipment and fire extinguishing equipment (sand, water, non-flammable liquids) may not be at hand. Many years of life experience proves that in the event of an emergency (fire, ignition), only a pre-developed evacuation plan and a fire-fighting water supply system equipped in an easily accessible place will help save life and property. It is very important that the design of the fire water pipeline is developed by qualified fire safety engineers. It is necessary that the developed project of a fire-fighting water supply system meets all fire safety requirements and all the features of the building and the specifics of its interior. Designing a fire-fighting water supply is a complex engineering task, since this water supply system is intended only for extinguishing fires or fires. Fire water supply is a network of pipelines, constantly and completely filled with water. This type of fire water supply is called "wet". A "dry" fire-fighting water supply is a water supply that is filled with water only when extinguishing a fire or fire. There are two types of fire hydrants: water supply, which is a system of several pipelines with fire shields. In many cases, it is connected to domestic water supply systems. This type of fire fighting system is designed to extinguish fires or fires manually. As a rule, the coverage area of ​​one fire shield is equal to the length of the fire hose (20 meters). automatic fire extinguishing system. The system is a network separated from the domestic water supply network with sprinklers (or drenchers), mounted throughout the entire building area. The sprinkler is capable of irrigating no more than 12 m². When an alarm occurs, the sprinklers turn on automatically. The system itself also works and continues to work without the participation of people. In order for water systems to work smoothly, it is necessary to accurately design the functioning of internal and external fire-fighting water pipes. Designing a fire water pipeline consists of the following stages: determination of the number of fire extinguishing jets and determination of their flow rate. When designing, it must be taken into account that each point of the room must be irrigated with at least 2 jets from two different adjacent risers. After that, the number of fire risers is calculated and their locations are determined. network wiring design. In buildings of 5 floors or higher, equipped with a fire-fighting plumbing, it is necessary to take into account the actions that ensure the two-way passage of water. This means that it is necessary to loop fire risers and taps with water risers. In this case, it is imperative to provide for the installation of shut-off valves on the jumpers. The self-supply water system in the event of a fire must be connected by jumpers to other water supply systems, if such conditions exist.

The high quality of technical components is not always enough to completely eliminate the risk of fire.

Already from the planning stage, the installation of an internal fire water supply system is highly dependent on the human factor as well.

During the development of the project, it is necessary not only to strictly comply with all technical requirements, but also to ensure that the resulting structure can be further modernized and expanded. Otherwise, the replacement or reconstruction of those complexes that are outdated may require too much extra money. In order for the installation to be carried out with high quality, you should contact only specialists from good companies who know their business - this will almost completely eliminate critical situations.

The installation of a fire-fighting internal water supply, like any work of this kind, begins with the design (which also includes the coordination of the entire project with the customer), during which it is important to avoid serious mistakes.

In this case, the composition of the working draft includes:

• An explanatory note indicating the type and description of the fire equipment used;
• Structural schematic diagram, axonometry;
• Hydraulic calculation for the system at the water supply;
• Floor plans, which indicate the arrangement of fire cabinets, equipment;
• Plan for the entire pumping station;
• Specification of materials, equipment;
• Electrical part.

After the design is completed, the installation itself is carried out directly, which can also be divided into stages. Experienced specialists who have been working in this field for a long time will easily guide you in the choice of equipment for VPPV, suppliers, materials.

Produced:

• Delivery, purchase of the necessary consumables and equipment;
• Installation of pipelines (fixing to the ceiling with a wall, welding);
• If necessary, according to design decisions, then remote start buttons, booster pumps are installed, connection to an automatic fire protection system is made;
• Then the pipeline is painted, fully equipped fire cabinets are installed. They are usually sealed, numbered later by the customer himself.

After the installation process is completed, the customer is introduced to the features of the entire resulting system and the final project is handed over to him. Everything, the work is finished.

In the future, after installation, the water supply system will need periodic preventive checks, which can also be carried out by specialists from trusted companies without any problems, guaranteeing the quality of work at affordable prices.

Often, the water supply of the quenching tower is installed in utility or industrial buildings.
The installation is carried out by a team of specially trained craftsmen who have all the necessary materials and tools. Because it saves time and money for the customer.
Features during installation are considered that:
- the priority when connecting the ERW is the water of the household water supply to which they are connected using special valves;
- if the height of buildings exceeds 16 meters, the control must certainly be automatic;
- if the pressure in the system is low, there is a need for additional installation of booster pumps;
- in high buildings, ERW must be placed in fire-resistant channels.
The installation is considered complete only after checking the water supply for water pressure and water loss.

Examination VPV is a mandatory procedure and is carried out regularly every six months - in spring and autumn. This is a guarantee of equipment durability. The verification work should be carried out by real and specially trained specialists who will carefully check the equipment and main components, and if a problem is found, they will eliminate it with ease.

Maintenance steps:
- visual examination;
- coating and sealing of all connections;
- check all components for faults.
After the inspection is completed, a document is issued indicating the time, date, stages of work for further presentation to the fire safety inspection, if required.
So, the fire water supply system is designed and installed. You need to prepare some documents and everything is ready for use.

Regulations for the maintenance of water sprinkler fire extinguishing systems and fire water supply

№ p/n	List of works	Service interval
	External inspection of the components of the system (technological part - pipelines, PC cabinets, sprinklers, check valves, dosing devices, valves, pressure gauges, pneumatic tank, pumps, etc.; electrical part - electrical control cabinets, electric motors, etc.), for damage, corrosion, dirt, leaks; strength of fasteners, the presence of seals, etc.	monthly
	Control of pressure, water level, operating position of valves, etc.	monthly
	Control of the main and backup power supplies and checking the automatic switching of power from the working input to the reserve and vice versa	monthly
	Checking the performance of the components of the system (technological part, electrical part and signaling part)	monthly
	System performance check in manual (local, remote) and automatic modes	monthly