Underfloor Above Ground Fire Protection

Features and Operating principle

Precast fire-fighting tanks from 10 to 900 m3 can be installed underground or above ground; underground fire tanks are connected to each other through connection holes equipped with PVC fittings with watertight gaskets, or stainless steel stubs or sleeves.
The underground fire-fighting tanks manufactured by Edil Impianti2 are entirely waterproofed using suitable products.
Prefabricated underground fire tanks allow for large storage capacities to meet various requirements.
Implementing a fire-fighting system with prefabricated underground tanks is a fast, safe method that offers significant savings in construction time and ensures high safety levels for workers on-site.
The prefabricated fire-fighting tanks produced by Edil Impianti2 can be supplied with thickened walls, reinforced rebar, and anti-floatation reinforcement.
Precast fire tanks can be supplied complete with a pressurization system and an underground Service Compartment-Technical Room, or with an above-ground installation.
The UNI EN 11292:2019 underground technical room for fire tanks is supplied complete with access ladder, REI door, ventilation holes, ducting, convector heater, lighting, painting, and everything else necessary to provide a compliant technical room.
Edil Impianti2 provides pressurization systems complete with testing and commissioning.
The pressurization systems installed by Edil Impianti2 are from the best brands currently on the market.
Edil Impianti2 is able to install pressurization systems upon request from the designer or the customer.

Supply Specification

The Underfloor Above Ground Fire Protection System is composed as follows:


Supply and installation of a Prefabricated Above-ground Firefighting/Water Reserve Tank compliant with UNI 12845 standard produced in DECLARED SERIES, code VASCANT_FT12845, with walls of __ cm thickness and a bottom of __ cm thickness, manufactured by EDIL IMPIANTI 2 S.r.l. with UNI EN ISO 9001 and ISO 45001 management systems, made of single-block Vibrated Reinforced Concrete, reinforced with vertical pillars and horizontal tie-rods in stainless steel, with high permanent elasticity and high chemical resistance Elastocolor anti-cracking protective elastomeric paint on the external concrete walls, concrete in compression resistance class C45/55 (RCK >55 N/mm²), internal steel reinforcements with improved adherence controlled at the factory and B450C type square mesh electro-welded net, complete with CHEMICAL RESISTANCE and REACTION TO FIRE (class: A1) certifications issued by an external body according to UNI EN standards.

N.__ x cm. ___x___xh___ + cov.h__; 
Total tank capacity equal to __ m³;
Internal USEFUL capacity according to UNI EN 12845 greater than __ m³.

Underground Firefighting Tank complete with:

•  n.1 stainless steel AISI 304 socket diam.2” for connection to the water supply replenishment pipe;
• n.2 sockets for pvc pipe diam. 110 mm for the realization of the overflow discharge pipe and air vent;
• n.1 pedestrian cover slab;
• inspection slots light cm.60x60.

Supply and installation of a Prefabricated Above-Ground R60/A1 Fire Technical Room in compliance with UNI 11292 produced in DECLARED SERIES, with external dimensions of cm.___x___xh___ sloped, with walls of thickness cm.__ and a base of thickness cm.__ , manufactured by EDIL IMPIANTI 2 S.r.l. with a management system UNI EN ISO 9001 and ISO 45001, made of single-block Vibrated Reinforced Concrete, reinforced if necessary with vertical pillars and horizontal braces in stainless steel, concrete in compression resistance class C45/55 (RCK >55 N/mm²), internal reinforcement in controlled high-adherence steel and square mesh electro-welded mesh type B450C and reinforced with GREESMIX5® 3D steel fibers (Patent N.0001421398 issued by the Ministry of Economic Development), complete with CHEMICAL RESISTANCE and REACTION TO FIRE certifications (class: A1) issued by an external body according to UNI EN standards.
The Above-Ground Technical Room is supplied complete with:

• n.1 R60 access door with minimum dimensions cm.90x205 in A1 class steel sheet;
• provision for internal room ventilation;
• internal anti-wear treatment and painting (white color);
• external wall protective coating with anti-cracking elastic paint (RAL 7040 grey);
• sloped cover slab with drip edge, completely waterproofed and sealed to the technical room below.

Above-Ground Technical Room Setup with Negative Suction Lift according to UNI 11292 complete with:
- main power supply panel for the pressurization unit and services;
- internal wiring of all accessories, pumps, main lighting + emergency lighting, industrial-type single-phase power socket;
- portable rechargeable emergency lamp(s) with min. 2 h autonomy, complete with wall support bracket and warning sign;
- natural ventilation aluminum louver(s) with fixed blades and insect protection mesh;
- convector heater for room heating;
- n.1 powder extinguisher + n.1 CO2 extinguisher, complete with wall support and warning sign;
- sprinkler protection system complete with CE-marked flow switch according to EN12259-5 for alarm reporting;
- sprinkler test and drain line with valve and 20 mm outlet orifice;
- microswitches for monitoring the status of shut-off valves;
- junction box with alarm terminal block to be reported to a supervised location;
- fan/extractor complete with overpressure damper;
- UPS backup power supply complete with batteries to guarantee fan operation;
- motor pump exhaust/external flue kit made with insulated stainless steel pipe protected with Class A1 materials;
- floor water presence sensor;
- water level and alarm control kit: constant display of water storage level status and detection of minimum and maximum water levels in the tank; alarm signals are available in the terminal block for remote transmission to a supervised location;
- floor drain for connection to the sewage system;
- floor anchoring of the pumping units to ensure stability and alignment over time, with mechanical characteristics capable of withstanding the unit's vibration during operation;
- suction lines with relative elbow, anti-vortex plate, and filter made of AISI 304;
- tank return recirculation line for flow testing made of AISI 304, complete with valves;
- diaphragm circuit line complete with flow indicator UNI EN 12845 10.5 to visualize water passage and service during zero-flow operation, made of AISI 304;
- shut-off valves with position indicator and lockable according to UNI 11443;
- flanged manifold made of AISI 304 complete with shut-off valve;
- documentation relating to the heating system, ventilation system, normal, emergency and safety lighting systems, backpressure of diesel engine exhaust gases, remote alarm signaling, flow diagram (P&ID), equipment layout to be displayed in the room, operation and maintenance manual with relative checklists.
Everything accompanied by system declarations of conformity according to Legislative Decree 37/08.
The provided room will be capable of maintaining satisfactory temperature and humidity conditions in all seasons and will guarantee temperature and humidity values capable of preventing the formation of dew and/or condensation.

Pre-assembled Fire Pump Set according to UNI EN 12845 (Above/Below Water Level Suction) composed of:
N° 1 main electric pump,
N° 1 main diesel pump, and one jockey pump.

The operation of the main pump modules (PUMP SET) is completely independent.
In case of a pressure drop that cannot be compensated by the limited flow rate of the pilot electric pump (jockey pump), the main pump starts automatically.
The shut-down of the main pump is **manual only** via a switch on its respective control panel, as required by UNI EN 12845. Automatic shut-down of the main pumps is only permitted for sets exclusively serving hydrant systems according to UNI 10779, based on the criteria outlined in UNI 10779 A 1.2. 

MAIN ELECTRIC PUMP
END SUCTION, single-impeller, normalized centrifugal pump, horizontal axis, **BACK PULL OUT** type, with volute casing and independent bearing frame; axial suction and radial discharge UNI EN 12845 10.1
Pump Casing in Cast Iron EN GJL 250
Impeller and Shaft in Stainless Steel
Mechanical Seal in ceramic/graphite
Pump-Motor connection via a spacer flexible coupling complete with safety guard UNI EN 12845 10.1
Pump/Motor set installed on a base frame made of metallic profiles, connection via a spacer flexible coupling, complete with safety guard UNI EN 12845 10.1
ELECTRIC MOTOR
Three-phase asynchronous, closed, externally self-ventilated motor with squirrel cage rotor
INSTALLED POWER (kW) __ Power calculated based on the power absorbed at the point on the characteristic curve corresponding to an NPSH of 16m UNI EN 12845 10.1
FLOW RATE (m³/h) __
HEAD (mca) __ (metres of water column)
NPSH (m) __
VOLTAGE 400/690 V, 50Hz
PROTECTION RATING IP 55
ROTATION SPEED 2900 rpm (revolutions per minute).

MAIN DIESEL PUMP SET
Pump/Motor set installed on a base frame made of metallic profiles, connection via a universal joint (cardan shaft) complete with safety guard UNI EN 12845 10.1
INTERNAL COMBUSTION ENGINE 
The engine power is the **NOMINAL CONTINUOUS** power dimensioned according to ISO 3046 in compliance with UNI EN 12845 10.9.1
INSTALLED POWER (kW)__ in NA curve Power calculated based on the power absorbed at the point on the characteristic curve corresponding to an NPSH of 16m UNI EN 12845 10.1
MAKE AND MODEL ____ or similar with direct air cooling
FLOW RATE (m³/h) __
HEAD (mca) __
NPSH (m) __
ROTATION SPEED 2900 rpm
Double-walled TANK on stand __ l with inner wall in AISI 304 UNI 11292 7.2.

JOCKEY PUMP
Jockey Pump kit kW _ at __ mca
Pump Casing and Motor Support in Cast Iron
Impeller in Brass
Diffuser in Noryl
Shaft in Stainless Steel 
Mechanical Seal in ceramic/graphite
Three-phase asynchronous ELECTRIC MOTOR 
INSTALLED POWER (kW) __
VOLTAGE 400 V 50Hz
ROTATION SPEED 2900 rpm.

MAIN ELECTRIC PUMP CONTROL PANEL
The electrical panel controls and monitors pump sets with electric and diesel pumps compliant with UNI EN 12845.
Assembled in a painted sheet metal enclosure with IP54 protection rating, built according to current CEI standards and compliant with the requirements of UNI EN 12845.
MAIN FEATURES
High vibration resistance
USB type A port for downloading stored data
Jockey pump monitoring (see jockey pump panel) Water storage tank level monitoring
Valve position monitoring
Sprinkler flow switch monitoring
Local drainage pump monitoring
Ambient temperature visible on display
Engine bulb monitoring
Oil and water temperature visible on display
Oil pressure visible on display
Message screen.
GENERAL FEATURES
Power supply 3P+N 400V±10% 50/60Hz
N°2 Battery chargers for charging and controlling batteries 6A 12Vdc for engines up to 102kW, 10A 12Vdc for engines up to 222kW, 10A 24Vdc for engines over 222kW
Engine Inhibition Switch “0 – 1”
4-20 mA signal input from level transmitter
Emergency start buttons from battery
Contactors dimensioned in AC3
Class II Transformer
Motor protection fuses
Auxiliary protection fuses
General disconnector with door interlock
Metallic enclosure
Terminal block User Manual
Wiring diagram and EC declaration.

WIRING ELECTRIC CABLES
The wiring within the set is made with FG16 OM16-0.6/1 kV type cables.

DISCHARGE MANIFOLD
The manifold consists of the following components:
N°1 lug-type butterfly isolation valve with position indicator, possibility of locking, and manual gearbox where required
N°1 inspectable check valve (non-return valve) of the swing-check type with reduced pressure losses
N°1 diaphragm recirculation circuit (continuous water flow) for cooling the main pumps during zero-flow operation, thereby preventing the pumps from overheating. UNI EN 12845 10.5.

DUAL PRESSURE SWITCH CIRCUIT
This component is required for the automatic starting of each main pump UNI EN 10.7.5.
Each circuit is composed of:
N°2 dual-scale pressure switches
N°1 pressure gauge class 1.6 Diameter 80 EN 12845 8.5.2 TR/11438:2016 6.1.4
N°1 check valve (non-return valve)
N°1 drain valve
JOCKEY PUMP AUTOMATIC START AND STOP CIRCUIT
The circuit is composed of:
N°1 dual-scale pressure switch
N°1 pressure gauge class 1.6
N°1 check valve
N°1 isolation valve
N°1 20 l / 16 bar diaphragm tank (pressure tank)
TIMED SHUTDOWN UNI 10779

REMOTE ALARM ELECTRICAL PANEL UNI EN 12845 10.8.6.2
The electrical panel performs remote supervision of pump sets with diesel pumps, electric pumps, and emergency power supplies compliant with UNI EN 12845.
Possibility of integrating a GSM message sending board (upon request).
Supplied loose, to be installed on-site by the installer.
To be installed in a permanently manned area UNI EN 12845 10.8.6.2.

FLOW METER WITH ANTI-CLOGGING CIRCUIT
Remote reading flow meter DN__ - up to __m³/h UNI EN 12845 8.5.2 for vertical/horizontal installation. Accuracy ~ 5% of full-scale value.

FUEL TANK UNI EN 12845 10.9.6 - UNI 11292 6.10.1
Double-walled fuel tank, with inner wall made of stainless steel to eliminate the risk of pipe clogging due to oxidation residues, capable of ensuring an operating autonomy of 6 hours at full power.

SUCTION MICROSWITCH KIT
Limit switches for ON/OFF status monitoring of the main pump suction valves As per UNI EN 12845 H2.2

DISCHARGE MICROSWITCH KIT
Limit switches for ON/OFF status monitoring of the main pump discharge valves As per UNI EN 12845 H2.2.

The supply includes the following Fire Protection Documentation:
- electrical design by a qualified professional;
- internal lighting design by a qualified professional;
- internal ventilation and temperature design by a qualified professional;
- plumbing declaration of conformity (Di.Co) according to D.M. 37/2008;
- electrical declaration of conformity (Di.Co) according to D.M. 37/2008;
- operation and maintenance manual for the installed machines and the technical room;
- as-built layout project and P&ID flow diagram.

Specific report for fire reaction and resistance R60 signed by our qualified technician.
Fees, payments, duty stamps, and filing with public offices are excluded.

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Precast Fire protection Tank Dimensions