Stable fire-fighting systems
Above-ground hydrant is fitted to the water supply network in order to take water for fire purposes, filling tanks, cleaning of streets, watering of green areas, etc..
Hydrant is composed of three parts: hydrant housing (part 1), hydrant body (part 2), and the hydrant cover (part 9).
In hydrant housing there is non-return ball valve, in hydrant body there are shut-off valve, and automatic drain valve, and on the hydrant cover there are two connectors for fire hose DN80, and one connector for fire hose DN100.
Above-ground and underground parts of hydrant are connected via fragile flange (part 8), which brakes under the possible impact protecting above-ground part of the hydrant. Hydrant stays closed via non-return valve, and changing fragile flanges puts hydrant in working condition fast. Orientation of connectors is easily manageable by turning the above-ground part of the hydrant.
Hydrant is closed manually by turning the cap (part 15) in the clockwise direction. Then the cone (part 4) fits on the seat (part 3) from above. In that cone position, drain hole is opened and residual water flows out from the hydrant to the drainage, so it can not be frozen. Ball of the non-return valve is pushed into the lower position so it does not interfere with sealing. Opening is done by turning the cap in the opposite direction, thereby cone closes the drain hole and prevent leakage into the drainage of the hydrant. Ball of the non-return valve is located in a position that does not interfere with the free flow of water.
After a five turns hydrant has maximum flow, further turning of the cap brings ball to fit on the seat of the bottom side, and completely closes the flow of water in the hydrant. In this position all the vital parts of the hydrant can be easily replaced from the top, without the excavation. This position is used for reparation, when the leaking of main seal element (cone) is confirmed.
Standard keys wich were prescribed by JUS should be used when opening and closing the hydrant. Do not use extension rods, because hydrant is equipped with thrust ball bearing which reduces torque for opening and closing of the hydrant.
With the installation of the hydrant with two valves the installation of shut-off valve in fron of the hydrant is no longer required. Construction work during installation are considerably smaller. Double valve allows repair of the hydrant without excavation, although the shut-off valve is not installed in front of it.
| No. | Part Name | Material |
|---|---|---|
| 1 | Hydrant housing | SL 250 |
| 2 | Check Valve Ball | Polypropylene |
| 3 | Seat | W.Nr.1.4301 |
| 4 | Valve plug | W.Nr.1.4301 |
| 5 | Hydrant body | W.Nr.1.4301 |
| 6 | Stem | W.Nr.1.4301 |
| 7 | Guide | SL 250 |
| 8 | Two piece flange | SL 250 |
| 9 | Hydrant cover | W.Nr.1.4301 |
| 10 | Threaded coupling | 110PNAl |
| 11 | Threaded coupling 75PN | Al |
| 12 | Axial ball bearing | 51110 |
| 13 | Ball bearing housing | W.Nr.1.0619 |
| 14 | Threaded bushing | CuZn37Pb |
| 15 | Cap | Al |
Foam pot is used to insert air foam into the tank, and to separate atmosphere using a glass plate. Foam enters the tank through the output flange and muffler. When the area of flow is increased, speed of foam is decreased. It is mounted on the top of the tank using the flange connection. In test mode, the pot lid is lifted so that the foam flows out from the upper part on outer side of the tank, without braking the glass plate. After extinguishing the fire, broken glass plate must be replaced with a new one.
| Designation | Weight Kg | Dimensions | |||||
|---|---|---|---|---|---|---|---|
| L | L 1 | L 2 | ØD | DNu | DNi | ||
| L4 | 45 | 716 | 250 | 236 | 323 | 80 | 125 |
| L8 | 52 | 716 | 256 | 296 | 323 | 100 | 200 |
| L12/16 | 75 | 970 | 300 | 360 | 400 | 150 | 250 |
Roof nozzle is used for cooling the roof of the tanks and similar objects. It is placed on the middle of the tank and gives conical spray of water at an angle 150°. Cooling the roof of the tanks is done independently from the cooling of the shell and shall be done during the high summer temperatures. It is made of brass, and for installation it is equipped with steel flange DN40 PN10 for nozzles. Output nozzle hole diameter is determined by the diameter of the tank and the pressure of water. For efficient cooling of the tank roof a minimum of 0.6 lit / min. of water per square meter is required.
Hydraulic characteristics of the tank roof cooling nozzles
Nozzle hole diameter should be chosen according to the diagram, and specify when ordering.
Water curtain nozzle is used for cooling the fuel tank shell. In that way cracking at the tank welding seam is avoided if the tank is set on fire. Cooling of adjacent tanks is done as a preventive measure.
Water curtain nozzle can be used for watering large areas. It is made of brass, which is nickel-plated.
Water curtain nozzles are arranged in concentric circles around the reservoir shell and create a uniform curtain of water that is perpendicular to the axis of the nozzle.
The required number of nozzles is calculated according to the intake pipe, the pressure in the pipeline and the flow of water through the nozzle. Pouring angle is 160°.
For cooling of the tank shell a minimum of 1.2 lit/min. of water per square meter is required.
Hydraulic characteristics of the water curtain nozzle G1/2"
Nozzle hole diameter should be chosen according to the diagram, and specified when ordering.
Foam diverter slows the flow of air foam by increasing the cross-section. It diverts the foram to the tank wall, from where the foam covers the fluid that is in the tank.
It is delivered and installed supplied along with the pot and the nozzle for heavy air foam.
Foam diverters are produced for tanks with with fixed roof and for tanks with floating roof.
For tanks with floating roof the special construction of the foam diverter is made.
| Designation | Weight Kg | Dimensions | ||
|---|---|---|---|---|
| L | I | DN | ||
| SK 4 | 5 | 375 | 307 | 125 |
| SK 8 | 12 | 552 | 511 | 200 |
| SK 12 | 18 | 675 | 665 | 250 |
| Ød | L | SMV |
|---|---|---|
| 7 | 39 | 26.1 |
| 9 | 41 | 26.2 |
| 10 | 44 | 26.3 |
| 11 | 44 | 26.4 |
Use
Stable nozzles for heavy air foam are used to protect above-ground fuel tanks and flammable liquids (oil and its derivatives, flammable materials in the chemical industry), as well as their reception pool. They are making heavy air foam from mixture od water and 3.5% foam reagent. Number of foaming is 6.5 to 8. The minimum pressure in front of the nozzle is 5 bar.
The conditions for making the foam
The foam reagent which is protein- and synthetic-based is used for making the foam.
Foam should come out freely from the nozzle, without falling. If the foam is taken to a distance, speed must be reduced and surface flow increased on exit.
Testing should not be carried out below 4° and under the influence of the wind.
Appropriate mixers should be used to obtain the mixture.
| Type | Inlet jets capacity at the pressure | Dimensions | Weight Kg | ||||
|---|---|---|---|---|---|---|---|
| 5 bara | 8 bara | L | Ød | DNu | DNi | ||
| MS 4 | 400 l/min | 500 l/min | 800 | 88.9 | 50 | 80 | 15 |
| MS 8 | 800 l/min | 1000 l/min | 1045 | 114 | 80 | 100 | 25 |
| MS 12 | 1200 l/min | 1500 l/min | 1100 | 159 | 100 | 150 | 32 |
| MS 16 | 1600 l/min | 2000 l/min | 1100 | 159 | 100 | 150 | 35 |
Electromagnetic diaphragm valves (EMMV-P) of nominal pressure PN 16 bar are made in version with flanges.
Under an electric voltage the valve is open. Version "closed under voltage" (type EMMV-PZ) is delivered on special request.
Use
It is used in pipeline installations for liquids and gases up to a temperature of 363 K (90° C). Permitted ambient temperature is up to 323 K (50° C).
The direction of installation is indicated on the case. It is installed with a vertically mounted electromagnet.
| DN | L | ØD | Ød | l |
|---|---|---|---|---|
| 40 | 200 | 150 | 150 | 345 |
| 50 | 230 | 165 | 170 | 356 |
| 65 | 290 | 185 | 190 | 395 |
| 80 | 310 | 200 | 200 | 420 |
| 100 | 350 | 220 | 255 | 470 |
| 150 | 480 | 285 | 324 | 550 |
Technical data
Standard version is with the excitation voltage of 220 V, 50 Hz. Excitation voltage tolerance is ± 10%.
The valves for direct current with the excitation voltage of 12 V, 24 V and 48 V, and for alternating current with 24 V excitation voltage and frequency of 50 Hz are delivered on special request.
Level of electrical protection is class IP 54, or IP 65 and Ex Protection on special request.
The valve is designed for continuous operation, and the maximum frequency of turning on is 4/min.
Maximum operating pressure is 12 bar. Minimum required pressure difference (input-output) for valve operation is 0.5 bar.
Materials
Housing material can be cast iron, carbon or stainless steel. Spindle and cone are made of stainless steel, membrane is made of NBR.
Testing
Valves are tested with water at 24 bar pressure for strength, with air at 6 bar pressure for sealing, and for functionality. Factory test certificate is issued for each valve.
Principle of operation
By bringing the excitation voltage to the electromagnet the space above the membrane is being vacuumed, then working fluid under pressure fills the space under the membrane and its energy opens the valve. Activation of the valve is possible by hand vacuuming the space over the membrane with connector on the electromagnet.
