Project of automatic water fire suppression system in a business center
Our design company has developed the working documentation of the automatic water fire extinguishing system business center.
APT DESIGN
Characteristics of the unit.
Automatic fire extinguishing installation is designed for detection, localization and suppression of fire without the direct participation of people in the process of extinguishing, as well as the issuance of fire alarms.
Installation of internal fire fighting unit is designed for localization and suppression of fire by specially trained personnel, as well as the issuance of fire alarms.
Protection by automatic installation water firefighting system in the parking lot All rooms must be protected by an automatic water fire extinguishing system in the parking lot and the highrise part (offices, hotel and restaurant) according to the technical specification, except for the rooms protected by gas and powder fire extinguishing installations, switch and transformer substations, machinery rooms of elevators, freezing chambers, bathrooms and other rooms with wet processes, fire elevator halls, as well as technical rooms (ventilation chambers, I&C and so on) which do not have a fire load.
SP 5.13130.2009 Appendix B. Protected areas of the parking lot are specified in Group 2. Group 1 of premises according to SP 5.13130.2009 Appendix B. According to the Customer's data the parking lots area has a specific fire load below 1400 MJ/ sq.m. and belongs to explosion and fire hazard Category B2. The entire complex shall be equipped with internal fire-prevention water supply system.
The technological part.
Pumping station fire fighting.
To maintain a constant pressure in the pipelines of the automatic fire-fighting water system and to ensure its work with the calculated parameters, an extinguishing pumping station is planned, with 3 groups of pumps.
The water supply source for the fire-fighting system is a municipal water supply system, from which pipelines to the fire-fighting pumping station are to be DN 200, each designed to pass 100% of the required flow of water. Municipal inlet provides the flow of water for internal firefighting needs in the amount of 73,2 l/s and a minimum head of 44 m.w.g. Deficiency flow in the amount of 13.8 l / s provides 10 min fire tank useful volume of 52.2 cubic meters.
The city water supply system carries out continuous replenishment of the reservoir a flow 73,2 l / s during the necessary time of firefighting (up to 3 hours). The required flow rate for firefighting is 87 l/s. The required volume of water for firefighting needs will be (by dictating the functional zone of the parking lot): 10,4 * 3,0 * 3,6 + 76,6 * 1,0 * 3,6 = 388.2 cubic meters.
From the reservoirs in the pumping station fire extinguishing pipelines provided DN 250, each designed to pass 100% of the required flow of water. The required useful volume of water in fire The required usable water volume in the fire tanks is determined according to the difference of maximum and makeup water consumption during one hour of operation. of the automatic water fire suppression system. The required volume of reservoirs is not less than 13,8 * 1,0 * 3,6 = 49,68 cubic meters.
The existing fire extinguishing pumping station is located on the -2nd underground floor in axis 7-8/A-B and has an exit to the stairwell, which has an exit to the outside, according to SSTU. The room pumping station separated from other rooms with fire partitions and ceilings with fire resistance rating REI . 45.
The pumping station room is sewered and provided with telephone connection with the control room.
There are three groups of pumps installed in the pumping station room:
The first group is designed to ensure the operation of the automatic water fire extinguishing installation of the parking and includes
-2 pumps NK 100-200/219 (" Grundfos "); one working, the other - standby with electric motors rated at 75 kW, n =2900 rpm. At a flow rate of 275.8 m 3 /hour the pump ensures the head of 63 m.p.h.
-Jockey pump CR 1-12 with a 0.75 kW electric motor, n = 2900 rpm is designed to maintain pressure in the system pipelines. At a flow rate of 1.8 m 3 /hour the pump provides a pressure of 57 m.p.h.
-Hydroaccumulator (membrane receiver) V = 80 л, P y = 10 kgf/cm 2 is designed for prolongation of cycle of switching off/on the booster pump.
- control nodes Nos. 1-2, shutoff valves and control devices.
-electric control cabinet.
The second group is designed to ensure the operation of the internal fire water supply system of the parking lot and includes:
-2 pumps CR 45-3-2(" Grundfos "); one working, the other - standby with electric motors rated at 11.0 kW, n =2900 rpm. At a flow rate of 37.44 m 3 /hour the pump ensures the pressure of 57 m.p.h.
- The "jockey" pump CR 1-12 with a 0.75 kW electric motor, n =2900 rpm is designed to maintain pressure in the system pipelines. At a flow rate of 1.8 m 3 /hour the pump provides a pressure of 57 m.p.h.
-Hydroaccumulator (membrane receiver) V = 80 л, P y = 10 kgf/cm 2 designed for prolongation of cycle of switching off/on the booster pump
-shutoff valves and control devices.
-electric control cabinets.
The third group is designed to ensure the operation of the automatic water firefighting system and internal fire fighting water supply of the ground part of the complex and includes
-2 pumps NK 100-315/269(" Grundfos "); one is a working, the other is a standby pump with electric motors with capacity of 110 kW, n =2900 rpm. At a flow rate of 208.1 m 3 /hour the pump provides 101 m.p.h. of head.
- jockey pump CR 1-19 with 1,1 kW electric motor, n =2900 rpm. At a flow rate of 1.8 m 3 /hour the pump provides a head of 89 m.p.h.
-Hydro accumulator (membrane receiver) V = 80 л, P y = 16 kgf/cm 2 designed for prolongation of cycle of switching off/on the booster pump
-control units No.3-10, pressure regulators, shutoff valves and control devices.
-electric control cabinets.
The pumps are selected according to the procedure described in the appendix in SP 5.13130.2009. The pumps shall be equipped with electric motors with protection against overload current and temperature rise.
The first group of pumps
Parameters for calculation:
-pressure at the farthest sprinkler from the CSC (for parking lot sprinklers, according to STU and SP5.13130.2009*) h cpr =12,7 м. (Kf=80)
-calculated geometric height of the sprinklers of the parking lot - h geom h geom . =13,0 м.
-pressure of the network of Horvodoprovod - H mountain =0,0 м.
Pump head, determined from the condition of the network of automatic water fire suppression system in the ramp:
H us = h geom cp + h cpr + h 1 sweat cpr + h 2 sweat + h 3 - H mountain
H us =13,0+12,7+18,0+10,0+0,5-0,0=54,2 м.
Where:
H us , m - pump head.
h 1 sweat spr =18,0 m - losses in the pipelines sprinkler network (for friction and local resistance) at a total flow to the sprinkler and drencher network of 76.6 l/s
h 2 sweat =10,0 m - losses in the pumping station pipelines (for friction and local resistance)
h 3 pers. =0.5 m -losses in the control unit (sprinkler) at a flow rate of 76.6 l/s.
The second group of pumps
Parameters for calculation:
- head under the fire hydrant h pk =19,9 м.
- calculated geometric height of the installation of the fire hydrant - h geom pc =9,35 м.
-pressure of the network of Horvodoprovod - H mountain =0,0 м.
Pump head, determined from the operating conditions of the internal fire water supply network:
H us = h geom pc + h pc + h 1 sweat pc + h 2 sweat - H mountain
H us =9,35+19,9+10,0+15-0,0=54,25 м.
Where:
H us , m - pump head.
h 1 sweat pc = 10,0 m - losses in the pipeline fire hydrants network (for friction and local resistance).
h 2 sweat = 15,0 m - losses in the pipelines of the pumping station (friction and local resistance).
The third group of pumps
Parameters for calculation:
- head at the outermost sprinkler from the SSC (for sprinklers, according to SP5.13130.2009* and STU) - h cpr =5.8 м. (Kf=80)
- head under the fire hydrant h pk =21,0 м.
-calculated geometric height of the ground fire hydrant installation h geom pc =56,65 м.
- calculated geometric height of the ground part sprinkler - h geom cpr =58,00 м.
-pressure of the network of Horvodoprovod - H mountain =0,0 м.
Pump head, determined from the conditions of the automatic water firefighting system network on the upper floor floor:
H us = h geom cp + h cpr + h 1 sweat cpr + h 2 sweat + h 3 sweat - H mountain
H us =58,00+5,8+15,0+15,0+0,5-0,0=89,3 м.
Where:
H us , m - pump head.
h 1 sweat spr = 15,0 m - losses in the pipelines sprinkler network (for friction and local resistance) at a flow rate of 50.0 l/s for the sprinkler network
h 2 sweat =10,0 m - losses in the pumping station pipelines (for friction and local resistance) at a flow rate of 57.8 l/sec.
h 3 pers. =0.5 m - losses in the control unit (sprinkler) at a flow rate of 50.0 l/sec.
Pump head, determined from the conditions of the internal fire water supply network:
H us = h geom pc + h pc + h 1 sweat pc + h 2 sweat - H mountain
H us =56,65+21,0+10,0+10-0,0=97,65 м.
Where:
H us , m - pump head.
h 1 sweat pc = 10,0 m - losses in the pipeline fire hydrants network (for friction and local resistance).
h 2 sweat = 10,0 m - losses in the pipelines of the pumping station (friction and local resistance.
Dictating, to select pumps for the residential part, adopted the network pressure in the fire hydrants.
The selected pumps CR 45-3-2, NK 100-200/1219,NK 100-315/269 provide the specified parameters.
From the room of the pumping station from each group of pumps outward branch pipes Ø80 for connection of mobile fire-fighting equipment. The number of branch pipes for each pump group is calculated according to the flow rate and the accepted location of the GM80 heads on the façade of the building, taking into account the requirements of 5.10.19 SP 5.13130.2009*.
Parking lot sprinkler network.
The sprinkler network of the parking lot The sprinkler network shall be separated from other building systems with an isolated group of fire pumps. The installation shall consist of 2 sections. Control units for the sections are located in the pumping station room.
The main parameters of the sprinkler system are the premises of the parking lot with a specific fire load of less than 1400 MJ / sq.m. are taken as the following values:
-intensity of irrigation of at least 0.16 l/m 2 intensity of irrigation not less than 0.16 l/m2 *s (according to Technical Rules and Regulations)
-area of localization of fire 120 sq.m.
- estimated protected area 120.0 sq.m.
-calculated time of operation of the installation The calculated operating time of the installation was 1.0 hours.
-area, protected by one sprinkler no more than 9 sq.m.
- the minimum water flow rate for operation of the sprinkler system 30,0 l / s (according to STU).
- the calculated water consumption at the two-tier storage of cars will be (without PC and drainage curtains) 60,0 l/s.
For the installation of bulb sprinklers rosette down with a response temperature 57 0 C and a coefficient of flow by international classification of 80 of the firm "Viking Viking "(Model M, VK 102).
Section 1 consists of sprinklers installed in rooms -1, -2 floors of parking lot, including fire compartment ramp N 3. The section is controlled by a water-signal valve d у 150 № 1.
Section 2 consists of sprinklers installed in rooms - rooms -1, -2 floors of the parking lot, including the ramp of the fire compartment N 4. The section is controlled by a water-signal valve dу 150 № 2.
In order to identify the location of the fire and control the engineering equipment, the installation of fluid flow alarms on each floor in each fire compartment of the parking lot. The installation of a shut-off valve is provided in front of the liquid flow switch.
Shut-off valves in the supply, supply and input pipelines provides visual and automatic control ("closed"-"open").
Automatic air curtains are installed above the doorways that connect the parking spaces with the spaces that are not part of the parking complex and in front of the floor ramp exits. Automatic opening of the solenoid valves of drift curtains is based on a signal from the pressure alarms of the control unit installed on the supply line of the sprinkler network. In addition to automatic, manual (local) start of each air curtain is provided.
The water flow rate for the air curtains is determined by the condition of simultaneous operation of all air curtains in one area. The maximum flow rate of the curtains: 16,6 l/s.
The mistblowers are mounted 0.15 m above the door opening with the outlet downwards at the rate of 1 l/s per 1 m of width. As drencher sprinklers adopted water sprinklers rosette down without bulb with coefficient of flow of international classification 57 company " Viking " (model M, VK 104).
Thus, the estimated water consumption to operate the system will be 60.0 +16.6 = 76.6 liters / s.
Internal fire water supply system of the parking lot.
The sprinkler network of the building and the internal fire fighting water supply system of the parking are made separately from each other and have separate groups of fire pumps. The internal firefighting water piping is made as a ring, with two connections to the pressure supply pipeline of the pumping station through a separating gate valve.
Fire hydrants are installed in the parking lot d у 65. The flow of water for the internal fire fighting water supply system is 10.4 l / s (2x5.2 l / s) with a free head of 19.9 m at the fire hydrant. Working time - 3 hours. The length of the fire hydrants hose is 20 m. Each fire hydrant cabinet is equipped with 2 fire extinguishers.
Thus, the total flow of water for the parking lot will be 76.6 +10.4 = 87.0 l / s.
Sprinkler network of the ground part.
The above ground sprinkler network Be a separate network from the rest of the building services with a separate group of fire pumps. The unit consists of 6 sections. Section control units are located in the pumping station room. There are 2 additional sections For deluge curtains protecting exterior glazing.
As the basic parameters of the sprinkler system the following values are taken as the main parameters of the sprinkler system:
-intensity of sprinkling not less than 0.08 l/m 2 *с
-fire localization area 60 sq.m.
- estimated protected area 60.0 sq.m.
-calculated time of operation of the installation The calculated operating time of the installation is 0.5 hours.
-area, protected by one sprinkler no more than 9 sq.m.
- the minimum water flow rate for operation of the sprinkler system 10,0 l / s.
- the estimated flow of water will be (taking into account the irrigation of exterior glazing) 25,0 l/s.
Provision is made forinstallation of additional sprinklers to protect the exterior glazing on the side of the premises. Sprinklers are installed at a pitch of not more than 2 m and not more than 1 m from the glazing and the intensity of 0.5 l / s, according to the STU.
Bulb sprinklers are accepted for installation with a rosette down sprinkler with a response temperature of 57 0 C and the coefficient of flow according to international classification 80 of the firm "Viking Viking " (model M, VK 102).
Section 3 consists of sprinklers installed in the hotel rooms on floors 1-7. The section is controlled by a water-signal valve d у 100 № 3.
Section 4 consists of sprinklers installed in the office area rooms on floors 1 through 3. The section is controlled by a water-signal valve d у
Section 5 consists of sprinklers installed in the office section rooms on floors 4-7. The section is controlled by a water-signal valve d у 100 № 5.
Section 6 consists of sprinklers installed in the office part rooms on floors 8-11. The section is controlled by a water-signal valve d у 100 №6.
Section 7 consists of sprinklers installed in the office part rooms on floors 12-14. The section is controlled by a water-signal valve d у 100 № 7.
Section 8 consists of sprinklers installed in the restaurant rooms on floors 1-2. The section is controlled by a water-signal valve d у 100 № 8. To identify the location of the fire and to control the engineering equipment, liquid flow alarms are provided on each floor in each of the residential blocks of flats. In front of the liquid flow alarms provide for the installation of a shut-off valve.
Shut-off valves on the supply, supply and input pipelines provide visual and automatic control ("closed"-"open").
According to STU, in places of adjoining adjacent fire compartments (at an angle of less than 135 gr.) provides for the device drencher curtains to protect the exterior glazing from the premises. The length of each curtain must be taken at least 4 m. Automatic opening of solenoid valves is carried out from the signal pressure alarms control unit installed on the supply pipeline sprinkler network. In addition to automatic, manual (local) start of each air curtain is provided.
Drencher curtains are connected to separate control units - sections 9 and 10. Sections are controlled by water-signal valves d у 100.
The water flow rate for the air curtains is determined based on the condition of simultaneous operation of all air curtains in of both fire compartments on the fire floor and on the upper floor. Maximum water flow rate for the curtains: 25.0 l/s.
Drainage sprinklers are installed under the ceiling with the socket down at the rate of 0.5 l/s per 1 m of glazing length. As drencher sprinklers adopted water sprinklers rosette down without bulb with coefficient of flow of international classification 57 company " Viking "(Model M, VK 104).
Thus, the approximate water consumption for the operation of the system will be 25.0 +25 = 50.0 l / s.
Internal firefighting water supply system of the above-ground part.
The network of internal firefighting water supply system of the above-ground part is made separately from the sprinkler network, and has a combined group of fire pumps. The internal fire fighting water supply system is made as a loop, with two connections to the pressure feed pipe of the pumping group III via a separating gate valve.
Fire hydrants are installed in the above-ground part d y 50 with a spray head of 13 mm. The water flow rate for the operation of the internal fire fighting water supply system is 7.8 l/s (3x2.6 l/s) at a free head at the fire hydrant 21.0 m. Working time - 3 hours. The hose length of the fire hydrants is 20 m. Each fire hydrant cabinet is equipped with 2 fire extinguishers.
The internal fire-fighting water supply system of each sub-zone is made as a loop, with two connections to the pressure supply pipeline of the pumping station through a separating gate valve. For the premises of the office part of the complex it is envisaged for the office part of the complex provides for looping risers on top.
In connection with the height of the building provides for the installation of pressure regulators in order not to exceed the pressure of 90 m.d.h. under the lower fire hydrant.
At a head of the fire hydrant to 40 m provides for the installation of diaphragms.
Scheme of the unit operation .
In Duty Mode, process pipelines of automatic water fire fighting and internal fire fighting water pipelines are filled with water and are under standby pressure maintained by "jockey"-pumps, located in the pumping station. When the pressure in the network drops due to leaks, the jockey-pump is switched on, and when the the jockey pump is switched on and switches off when the standby pressure is reached.
When a fire occurs, water from the pipelines of the system through the open sprinklers (fire hydrant valve) enters the fire zone. At the same time, the pressure in the network drops. The fire pump is switched on by two electric contact pressure gauges installed on the pressure pipeline. At the same time, the pressure switch on the control node and (or) the corresponding liquid flow switch actuates and forms a signal of the fire place. At the failure of the normaloperating pump mode is automatically activated by the standby pump.
Turning off the unit after a fire and transferring the unit to standby mode manually by the ATRM operator.
Electrical part of the project
The electrical part of the automatic water fire-extinguishing installation and the internal fire fighting water supply system is designed for
- automatic и local control of the system from the pumping station;
- remote activation of fire pumps by means of electric buttons installed in the cabinets with fire hydrants;
- automatic control of the electrical circuits pressure switches forming the command for automatic switching of fire pumps and electric circuits of remote start of the installation - for breakage and short circuit;
- formations command impulse of for shutdown ventilationand process equipment;
Transmission of information signals about fire in directions, about the position of BK gate ("open" and "closed") before each liquid flow switch on the pipeline network and in the pumping station on the supply, supply and inlet pipelines, from pressure alarms (HP) on control and signal valves (CSC) and liquid flow alarms ( HQ ) is stipulated in the PS design section.
Automatic water firefighting installation in the parking lot (1st group of pumps)
Pump NK 100-200/219 (75 kW) main pump;
Pump NK 100-200/219 (75 kW) standby;
Pump CR 1-12 (0.75 kW) jockey;
Control of the installation is carried out by the device "Sprut-PU №1" through the cabinet of switching equipment SHAK1.
In the standby mode the system pressure of 0.65 MPa is controlled by electric contact manometers (ECM) NMR1-NMR6, installed on the pressure piping.
When the pressure in the system drops to 0,55 MPa monitored by ECM НМР4, the "jockey-pump" is automatically activated. When the system pressure reaches the standby mode, the jockey-pump is automatically switched off by the signal of ECM НМР5.
When the pressure in the system drops to 0,5 MPa, the signal "Alarm" ("leakage" in the system) is generated from ECM HMP6.
In case of fire, when you open the sprinklers on the sprinkler network, the pressure in the system drops to 0.45 MPa and automatically turns on the working fire pump. Control the pressure and give the control impulse for its inclusion ECM HMP1 and HMP2, installed on the pressure piping.
The working mode of the fire pump is controlled by ECM HMP3, installed on the pressure line of the pump. If when the working fire pump is switched on, the ECM HMP3 is not switched to the set point 0.52 MPa, the standby pump is automatically started and the working pump is switched off.
Control of the start-up of the drencher curtains on the pipe network of the parking lot is carried out by means of relay modules, which are part of the equipment of the PS system.
The control unit provides general control of all gate valves on the pipelines of the pump group and generates a signal "All gate valves of pump group No.1 in normal position" for output to the dispatching system. Individual control of gate valves "not in normal position" is provided by the technical means of the dispatching system or the fire alarm system of the building.
The unit control unit generates signals "Unit start-up", "Failure", "Automation disabled" for output to the dispatching system.
The signals are generated at the control cabinet SHAK1 in the form of potential-free contacts of the power relay.
Indications of the pump unit operation are formed on the devices Sprut-TsPI, Sprut-PI, located in the room of duty personnel.
Installation of indoor firefighting water supply system in the parking lot
Pump CR 45-3-2 (11 kW) main;
Pump CR CR 45-3-2 (11 kW) standby;
Pump CR 1-12 (0,75) jockey;
Control of the installation is carried out by the device "Sprut-PU № 2" through the cabinet switching equipment SHAK2.
In the standby mode the pressure in the system of 0.65 MPa is controlled by electric contact manometers (ECM) NMR7-NMR12, installed on the pressure piping.
When the pressure in the system drops to 0,55 MPa monitored by ECM НМР10, the "jockey-pump" is automatically activated. When the system pressure reaches the standby mode, the jockey-pump is automatically switched off by the signal of ECM НМР11.
When the pressure in the system drops by 0,5 MPa, the signal "Alarm" ("leakage" in the system) is formed from ECM HMP12.
When you open the valve on the network fire water supply parking, a drop in pressure in the system to 0.45 MPa and automatically turns on the working fire pump. Monitor the pressure and give the control impulse on its inclusion ECM HMP7 and HMP8, installed on the pressure pipe.
Fire hydrants cabinets of the parking lot are equipped with a "Start" button, a signal from the operation of which is sent to the fire control station and to the control automatics of this group of pumps. Transmission of status signals is provided through the technical means of the fire alarm system.
The automatic and remote start signal comes to the fire pumps after the automatic check of the water pressure in the system. If the pressure in the system is sufficient, the starting of the pumps is automatically canceled until the pressure decreases to 0.45 MPa, which requires activation of the fire pumps (in accordance with SP10.13130.2009*).
The working mode of the fire pump is monitored by ECM NMR9, installed on the discharge line of this pump. If the working fire pump is switched on and the ECM HMP9 is not switched to 0.52 MPa, the standby pump is automatically switched on and the working pump is switched off.
The control unit provides general monitoring of all gate valves on the pipelines of the pump group and generates a signal "All gate valves of pump group No.2 are in normal position" for output to the dispatching system. Individual control of the gate valves "not in normal position" is provided by the technical means of the dispatching system or the fire alarm system of the building.
The unit control unit generates signals "Unit start-up", "Failure", "Automation disabled" for output to the dispatching system.
The signals are issued at the control cabinet SHAK2 in the form of potential-free contacts of the power relay.
Indication of the work of the pump unit is formed on the devices Sprut-TsPI, Sprut-PI, located in the room of duty personnel.
Automatic installation of water fire-fighting and fire fighting water pipelines of the above-ground part
Automatic installation of water fire-fighting and fire fighting water pipelines of the above-ground partPump NK 100-315/269 (110 kW) main;
pump NK 100-315/269 (110 kW) standby;
Pump CR 1-17 (1.1 kW) jockey pump;
Control of the installation is carried out by the device "Sprut-PU №3" through the cabinet of switching equipment SHAK3.
In the standby mode the system pressure of 0.9 MPa is controlled by electric contact manometers (ECM) NMR13-NMR18, installed on the pressure piping.
When the pressure in the system drops to 0,8 MPa monitored by ECM НМР17, the "jockey-pump" is automatically activated. When the system pressure reaches the standby mode, the jockey-pump is automatically switched off by the signal of ECM НМР18.
When the pressure in the system drops to 0,75 MPa, the signal "Alarm" ("leakage" in the system) is generated from ECM NMR16.
In case of fire, when you open the sprinklers on the sprinkler network, the pressure in the system drops to 0.7 MPa and automatically turns on the working fire pump. Control the pressure and give the control impulse for its inclusion ECM HMP13 and HMP14, installed on the pressure pipeline.
When you open the valve on the fire water supply network above ground, there is a drop in pressure in the system to 0.7 MPa and working automatically turns on the fire pump. Control the pressure and give the control impulse for its inclusion ECM HMP7 and HMP8, installed on the pressure pipeline.
Above-ground fire hydrants cabinets are equipped with a "Start" button, a signal from the actuation of which is sent to the fire control station and to the control automatics of this group of pumps. Transmission of status signals is provided through the technical means of the fire alarm system.
The automatic and remote start signal comes to the fire pumps after the automatic check of water pressure in the system. If the pressure in the system is sufficient, starting of the pumps is automatically canceled until the pressure decreases to 0.7 MPa, which requires activation of the fire pumps (according to SP10.13130.2009*).
Control of the start-up of the drencher curtains on the above-ground pipeline network is carried out by means of relay modules that are part of the PS system equipment.
Fire pump operating mode is controlled by ECM HMP3, installed on the discharge line of this pump. If when the working fire pump is switched on, the ECM HMP15 is not switched to the set point 0,87 MPa, the standby pump is automatically switched on and the working pump is switched off.
The control unit provides general control of all gate valves on the pipelines of the pump group and generates for the dispatching system
- switchgear cabinet (SHAK).
Control devices are installed at the location of the monitored equipment, indication devices - in the room of the duty personnel.
Control and monitoring of the WTP system equipment located outside the premises of the pumping station is carried out by the technical means of the fire alarm system in accordance with the "Assignment for automation".
Alarm system
In order to inform the personnel about the state of the water fire-fighting system and the internal fire fighting water supply system the light and sound alarm is provided.
In the room of the firefighting pumping station - light alarm:
- about the start of fire pumps (signal "Fire");
- on occurrence of an accident (signal "Failure") - leakage;
- automatic start of fire pumps, "jockey-pump" (signal "Automatic start disabled");
- about the deactivation of the audible alarm of fire and malfunction;
In the room of the fire-fighting post on the indication devices - light and sound alarms:
- on the occurrence of fire (signal "Fire");
- on occurrence of an accident (signal "Accident");
- on failure automatic failure of automatic start (signal "Automatic start disabled" signal);
- about the start of fire pumps (information is displayed in text and mnemonic form); - presence of voltage on the power supply input of the installation; Audible alarm of the following types: - short monophonic short single-tone signal in case of startup any of their motors; - alternating current in the event of an "Alarm" or "Automatic start disabled" signal;- complex alternating tone in the event of a "Fire" signal. Communication cable lines Electrical wiring from the SHAK to the electric motors of fire pumps and actuators is performed with wires of VVGng- FRLS . . Cable cross-sections are based on the types and power of the loads to be connected and are shown on the diagrams and plans of this project. The cable lines shall be laid through the cable trays designed in the pump room as well as through the walls and ceilings in a corrugated tube.
The signal lines from the ECM and water-signal valves, from the equipment of the adjacent systems are carried out with the signal cable of the type
KPS(A)ng-
FRLS
1x2õ0,75 in corrugated pipes and on metal wire trays. Control line
RS -485 control line is made by flameproof cable KSBng(A)- FRLS 2
x 2 x 0.80. Electrical supply and earthing of the installation According to the degree of reliability of electricity supply equipment fire water and water fire-fighting system refers to the consumer category I, according to PUE. Feeding cabinets installation is carried out from two inputs. The total power consumption of the pump units is 210 kW. Switching equipment cabinets are equipped with built-in ATS. In the rooms that are designed to accommodate the equipment, The protective earthing loop shall be provided in accordance with the Electrical Installation Regulations, Building Regulations 3.05.06-85, GOST 12.1.03-87 requirements and the technical documentation of the component manufacturers. All cable bearing structures and parts of equipment which are normally not under voltage must be earthed.
The resistance of protective earthing should not exceed 4 ohms.
Installation and operation requirements The automatic water fire-extinguishing system and the indoor and outdoor fire-fighting water pipelines shall be assembled of steel water-gas pipelines (GOST 3262-75) and electric-welded steel pipes (GOST 10704-91).
Installation should be carried out in accordance with the requirements of VSN 25-09.67-85 "Rules of Production and Acceptance of Work. Automatic fire-extinguishing installations." and guidelines VNIIPO Russian Interior Ministry "Automatic fire extinguishing and fire alarm systems. The rules of acceptance and control," 1999g. To service this facility requires a 4th category plumber and electrician 4th category. To work with the installation should be allowed persons who have been trained according to GOST 12.0.004-79.
Maintenance and scheduled preventive maintenance of the installation should be organized in accordance with RD 009-02-96 "Installation of fire automation.
Maintenance and preventive maintenance" and RD 009-01-96 "Fire-fighting automatic installations. Rules of technical maintenance".