SMART PRO 150 FLAME TRAP
Discover our Case History
THE FUNCTIONS OF THE SMART PRO 150 FLAME TRAP
STOPS FLAMES FROM SPREADING AND PREVENTS THE COMBUSTION OF FLAMMABLE LIQUIDS
A TRAP EVERY 25 METRES
Each trap, normally installed at a distance of between 25 and 50 metres (depending on the conditions around the various tunnels) the one from the other, is connected to the main drainage pipe, i.e., the manifold which runs above the tunnel invert along the entire tunnel, by means of cross connectors.
THE SIPHON FULL OF WATER BLOCKS THE FLAMES
The trap prevents the flames from spreading thanks to the “P-shaped” siphon and the presence of water inside its “gooseneck”.
The “gooseneck” shape of the siphon also ensures the isolation of each flame trap from the rest of the drainage system.
THE TRAPS COLLECT SPILLED LIQUIDS AND RESTRICT THE FIRE AREA
The flame traps are designed to collect any liquids spilled onto the road surface in order to reduce the size of the liquid puddle and prevent the flames from spreading to other parts of the tunnel. The possible combustion of flammable liquids is therefore restricted only to the carriageway section closest to the trap.
In the event of flammable liquids entering the channel and subsequently igniting, the siphon shape of the trap stops any flow of oxygen and consequent combustion (due to lack of air flow).
What is more, the extinction of the flames is also facilitated by the continuous flow of water from outside and by the fire-fighting system.
TECHNICAL FEATURES
The SMART PRO 150 flame trap made by Greenpipe has intrinsic features which ensure top-level performance.
WATER RUNOFF RATE – 6.67 litres a second
The hydraulic capacity test was carried out at the laboratories of the Istituto Giordano. The test was performed on a hydraulic test bench whereby the trap was supplied through a series of water jets on a guide with appropriate inclination. The water flow rate was gradually increased with the aim of verifying the maximum flow rate which the trap was able to deal without a water head forming. This figure proved to be higher than that required by Legislative Decree no. 264/2006.
NON-COMBUSTIBLE MATERIALS RESISTENT TO HYDROCARBONS
The materials from which the trap is made (concrete, iron, steel, AISI 316 stainless steel) besides being resistant to hydrocarbons, are included on the Fire Fighters’ list of “materials considered as belonging to fire reaction classes A1 without having to undergo testing”.
The composition of the sealant used to secure the additional external pipe to the channel also ensures utmost resistance to hydrocarbons.
HIGHLY RESISTENT GASKETS
The gaskets in the spigot joints of the additional pipe and siphon are made of NBR (nitrile rubber) and provide a broad operating temperature window, high and constant friction, high abrasion resistance including with increasingly high temperatures, high dynamic properties, excellent antistatic properties, excellent resistance to oils, mineral greases, hydraulic fluids derived from petroleum, aliphatic hydrocarbons, methane and LPG, diesel fuel and kerosene, alcohols and glycols, vegetable and animal fats, hot water up to 100 °C.
CE MARKING
At the bottom of the flame trap is a Smart Pro 150H210 channel tested in compliance with the EN1433 standard and bearing the CE mark as required by Regulation (EU) 305/2011. The Smart 150 D400 cover grids are also tested to determine their suitability to the class to which they belong and also bear the CE mark.
UTMOST VERSATILITY
To the technical characteristics of the trap must be added the top-quality of the raw materials used for the channel body and accessories (siphon, filter, pipe) and production versatility. In fact, the same trap can be made starting from Smart Pro channels of other dimensions (for example 200H275, 300H335, 350H440, etc.) or “special” models can be developed based on the current model.
Therefore, Greenpipe’s range of flame traps is highly modular and can be customised according to the designers’ needs and the intrinsic characteristics of the various tunnels involved.
STANDARD PRODUCT VARIANTS: SECOND INSPECTION HOLE
Greenpipe has developed a trap version with a second outlet for inspecting and cleaning the main drainage pipe.
In this version, the bottom of the channel has a second opening which connects it, by means of a 90°-curve pipe, to the main drainage pipe. Through this opening, an inspection probe can be inserted to check the main drainage pipe.
Except when the need for inspection arises, the pipe is closed inside the channel with a watertight cap. All products are always made of stainless steel and feature NBR gaskets.
FAST-LOCK
The traps can be made with cast-iron profile, i.e. on the basis of the Smart Pro G channels so that spheroidal cast-iron grids can be used with the FAST LOCK feature for easy installation by means of simple pressure. This ensures faster maintenance times which translate into lower costs for the motorway network management company and less inconvenience for motorists.
SMART PRO 150 flame trap with 1 outlet
SMART PRO 150 flame trap with 2 outlet
In order to ensure the correct operation of the Smart Pro 150 flame traps, a number of important solutions must be adopted:
- always keep the siphon full of water: if the system is not used for a long time, the water inside the siphon risks evaporating and the product would no longer fulfil its function. In these cases, it is sufficient to refill with water to ensure that the system is restored.
- always keep the siphon and filter clean: in the lower part of the gooseneck, various types of debris (stones, asphalt, very fine residues, etc.) could accumulate to the point of rendering the siphon ineffective. For this reason, a filter has been fitted above it which itself requires careful maintenance and cleaning to ensure the correct operation of the entire system.
Liquid level control and cleaning operations are the responsibility of the end user of the flame trap, who must follow the instructions provided by the manufacturer (see “Installation and maintenance instructions”).
INSTALLATION
Canale di drenaggio lineare monolitico fabbricato con Filcoten HPC (calcestruzzo ad alte prestazioni).Biologicamente testato e raccomandato dall’IBR (Institut für Baubiologie Rosenheim, DE). Classe di protezione antincendio A1 secondo EN13501 (non infiammabile). Classe di carico D400 – F900; testato secondo EN1433; Certificato CE.
1. These installation guidelines are of an approximate nature; the customer (or designer) must ensure that they are compatible with the type of soil and the surrounding conditions.
2. In order to comply with its drainage function and not to overload the grid support surface with enormous stresses, the trap must be installed at least 3-5 mm below the level of the surrounding pavement (see installation diagrams).
3a. The single-outlet trap is supplied on site as follows:
– 1 SMART PRO 150 H210 drainage channel with integrated galvanized-steel reinforcement profiles and additional external pipe H180 in AISI 316 stainless steel and 1 SMART150 D400 spheroidal cast-iron grid already assembled with M10 screws;
– 1 “P-shaped” siphon with diameter 110mm in AISI316 stainless steel;
– 1 AISI316 stainless-steel anti-debris and anti-rat filter;
– 1 SMART 150 D400 spheroidal cast-iron grid complete with 4 stainless steel M10 screws for fastening;
– 1 90°-curve with diameter 110mm in AISI316 stainless steel;
– 2 galvanized-steel closing end-caps.
The contracting firm is responsible for assembling the siphon, the filter, the closing end-caps and the second grid.
3b. The double-outlet trap is supplied on site as follows:
– 1 SMART PRO 150 H210 drainage channel with integrated galvanized-steel reinforcement profiles, additional external pipe H180 and additional external pipe H120 (both made in AISI 316 stainless steel);
– 1 “P-shaped” siphon with diameter 110mm in AISI316 stainless steel;
– 1 AISI316 stainless-steel anti-debris and anti-rat filter with diameter 110 mm;
– 2 SMART 150 D400 spheroidal cast-iron grids complete with stainless steel M10 screws for fastening;
– 1 90°-curve with diameter 110mm in AISI316 stainless steel;
– 1 watertight cap with diameter 110mm in AISI316 stainless steel;
– 2 galvanized-steel closing end-caps.
The contracting firm is responsible for assembling the siphon, the filter, the closing end-caps and the grids.
4. CLEANING and MAINTENANCE JOBS
a. The structure management firm is responsible for deciding the flame trap cleaning and maintenance schedule. Such jobs must in any case be performed at least every 2 months.
b. The work must at least consist of cleaning the filter, the bottom of the channel and, if necessary, the lower part of the siphon, as well as of checking the water level inside the P-neck of the siphon itself, which must always remain full at the maximum possible level.
c. During trap maintenance and cleaning, the grids must be removed: it is advisable to tighten the screws in the respective seats (beds) without overtightening them for the sole purpose of protecting the seats from any debris.
Wear layer (carriageway)
Bituminous foundation binder
Bituminous load-bearing layer
Gutter flanking
Underlying load-bearing soil
Existing tunnel section (shoulder) in concrete
Load class D400
Concrete type C 25/30
X (widths) 5 cm
Z (thickness) cm according to specific design
The designer is entrusted with checking the load-bearing capacity of the soil and the conditions around the site and, consequently, choosing the X and Z dimensions, the type of concrete and any suitable reinforcement. In case of concrete exposed to freeze-thaw cycles, use an exposure class XF4.
Supply and installation of prefabricated fire trap type M model 150H210 with 1 outlet for the collection of different kinds of liquids, including flammable, present in the tunnel. The structure will be made of high-strength vibrated concrete, fibre-reinforced with steel fibres, minimum class C35/45, walls not less than 30mm thick, provided with “W”, “+R” and CE markings in compliance with UNI EN1433 and Regulation (EU) 305/2011. The product will consist of the following parts:
– channel with load-bearing capacity from A15 to E600, semi-circular bottom to ensure maximum water flow and avoid stagnation, no integrated slope, featuring galvanised-steel profiles perfectly secured to the concrete, featuring M10 threaded inserts to which the screws for fixing the grids can be fastened – 8 per metre -, edge subject to traffic with a thickness of not less than 4mm, thickness of the contact surface not less than 2mm and height not less than 19mm; a outlet with a maximum diameter of 125mm must be drilled in the bottom of the channel at a distance of 125mm from the female side; the maximum overall dimensions of the channel will be 212x210x1000 mm, internal section 150×150 mm.
– slotted grids made of spheroidal graphite cast iron GJS 500/7 according to EN1563, load class D400, dimensions 200 x 498 x 19 mm, with fixing system with 8 screws per linear metre
– additional external pipe in AISI 316 stainless steel with a diameter of 110mm, length 180mm, featuring thin wall with a maximum sheet thickness of 0.9-1.0 mm, and spigot joint in which an NBR gasket will be fitted; the pipe will be inserted in the outlet of the channel to which it will be made integral by means of a single-component polyurethane sealant with high elastic modulus for hydrocarbon resistant joints; once installed, the pipe will protrude from the channel extrados by 140mm;
– AISI 316 stainless-steel P-shaped siphon, diameter 110mm, featuring thin wall with a maximum sheet thickness of 0.9-1.0 mm, and spigot joint in which an NBR gasket will be fitted; the siphon will be fastened to the additional external pipe and made to slide up against the end of its spigot;
– AISI 316 stainless steel filter with a diameter of 110mm to be fitted from inside the channel into the spigot of the additional external pipe; the insertion depth must be at least 40mm;
– galvanised-steel closing end-caps to be pressure fitted at the two ends of the channel; no watertight seal is required.
The total height of the trap, siphon included, must not exceed 492 mm +/- 5 mm and its minimum length will be 1008 mm +/- 5 mm.
Supply and installation of prefabricated fire trap type M model 150H210 with 2 outlets for the collection of different kinds of liquids, including flammable, present in the tunnel. The structure will be made of high-strength vibrated concrete, fibre-reinforced with steel fibres, minimum class C35/45, walls not less than 30mm thick, provided with “W”, “+R” and CE markings in compliance with UNI EN1433 and Regulation (EU) 305/2011. The product will consist of the following parts:
channel with load-bearing capacity from A15 to E600, semi-circular bottom to ensure maximum water flow and avoid stagnation, no integrated slope, featuring galvanised-steel profiles perfectly secured to the concrete, featuring M10 threaded inserts to which the screws for fixing the grids can be fastened – 8 per metre -, edge subject to traffic with a thickness of not less than 4mm, thickness of the contact surface not less than 2mm and height not less than 19mm; two outlets with a maximum diameter of 125mm must be drilled in the bottom of the channel, the first at a distance of 125mm from the female side and the second at a distance of 144mm from the male side; the maximum overall dimensions of the channel will be 214x210x1008 mm, internal section 150×150 mm.
slotted grids made of spheroidal graphite cast iron GJS 500/7 according to EN1563 standard, load class D400, dimensions 200 x 498 x 19 mm, with fixing system with 8 screws per linear metre
additional external pipe in AISI 316 stainless steel with a diameter of 110mm, length 180mm, featuring thin wall with a maximum sheet thickness of 0.9-1.0 mm, and spigot joint in which an NBR gasket will be fitted; the pipe will be inserted in the outlet of the channel -female side- to which it will be made integral by means of a single-component polyurethane sealant with high elastic modulus for hydrocarbon resistant joints; once installed, the pipe will protrude from the channel extrados by 140mm;
AISI 316 stainless-steel P-shaped siphon, diameter 110mm, featuring thin wall with a maximum sheet thickness of 0.9-1.0 mm, and spigot joint in which an NBR gasket will be fitted; the siphon will be fastened to the additional external pipe H180 and made to slide up against the end of its spigot;
AISI 316 stainless steel filter with a diameter of 110mm to be fitted from inside the channel into the spigot of the additional external pipe H180; the insertion depth must be at least 40mm;
additional external pipe in AISI 316 stainless steel with a diameter of 110mm, length 120mm, featuring thin wall with a maximum sheet thickness of 0.9-1.0 mm, and spigot joint in which an NBR gasket will be fitted; the pipe will be inserted in the outlet of the channel -male side- to which it will be made integral by means of a single-component polyurethane sealant with high elastic modulus for hydrocarbon resistant joints; once installed, the pipe will protrude from the channel extrados by 80mm;
90° curve in AISI 316 stainless steel with 110mm diameter complete with spigot joint to which will be fitted an NBR rubber gasket; the curve will be fitted to the extra external pipe H120 and made to slide up against the end of the spigot;
AISI 316 stainless-steel watertight cap to be fitted inside the channel in the spigot of the extra external pipe H120;
galvanised-steel closing end-caps to be pressure fitted at the two ends of the channel; no watertight seal is required.
The total height of the trap, siphon included, must not exceed 492 mm +/- 5 mm and its minimum length will be 1,008 mm +/- 5 mm.
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