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FOAM chữa cháy

  • Bầu phun foam

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    APPLICATION

    Foam Chamber is used in one of the most common application to protect vertical fixed roof (cone) liquid storage tanks, with or without internal floating roof with the low expansion foam system. The application of foam is on the basis that the risk comprises the total surface area of the fuel. The foam system design guidelines generally used are in accordance with NFPA-11, standard. Foam Chambers are defined by NFPA-11 as Type II discharge outlets for delivering the foam to the surface of a flammable liquid. The Foam Chambers are widely used with the In-line foam inductor, Balance pressure foam proportioning system, Bladder tank proportioner or Foam tender. MODEL FC SIZE 50, 65, 80, 100 &150 NB inlet WORKING PRESSURE Minimum 2.8 Kg. / sq. cm. (40 PSI) Maximum 7 Kg. / sq.cm. (100 PSI) FLANGE CONNECTION ANSI B16.5 Class 150# APPROXIMATE FC 50- 28.0 Kg. WEIGHT FC 65- 35.0 Kg. FC 80- 52.0 Kg. FC 100- 78.0 Kg. FC 150-108.0 Kg. VAPOUR SEAL 0.7 to 1.75 Kg./sq.cm.(10 PSI TO 25 PSI) RUPTURE PRESSURE Running water/Water foam solution pressure at the inlet of Foam Chamber. MAXIMUM 0.06 Kg./sq.cm. (0.9 PSI) PERMISSIBLE BACK PRESSURE ON VAPOUR SEAL FINISH Red epoxy painted ORDERING a) Model and size INFORMATION b) Inlet pressure. c) Foam solution flow reqd. d) Inlet, outlet flange specification. e) Type of foam concentrate used.

    SPECIFICATION

    Foam chamber is an air aspirating foam discharge device, covering wide range of flow from 75 to 3600 litres per minute at 2.8 to 7 kg/sq.cm inlet pressure. The foam chamber contains a vapour seal to prevent the entry of vapour into the foam chamber and the foam solution pipe. Each foam chamber is supplied with an orifice plate, designed for the required flow and inlet pressure. The orifice is field replaceable in the event of change in design parameters. The foam is produced by introducing air into the foam solution stream. The inlet of foam chamber is designed to create venturi jet which draws air into the foam solution stream. The air is drawn into the foam solution through the holes located on the foam chamber covered with stainless steel screen to exclude nesting birds and insects. The aerated foam is directed into the deflector for the gentle application of the expanded foam. The deflectors are available in different models. On removal of cover plate from the top of the chamber allows the system to be tested and to draw a sample of the expanded foam, without removing the vapour seal or disconnecting the foam chamber from the tank. Frangible glass bursting disc (vapour seal) can be replaced very easily.

    SYSTEM DESIGN REQUIREMENT

    The NFPA-11, a standard for low expansion foam, provides the essential requirement of an appropriate designed foam pouring system, which are identified and outlined as below: The Foam Deflector is used with the Foam Chamber. The aerated foam from the Foam Chamber is directed in to the deflector for the gentle application of the expanded foam. The deflector reduces the expanded foam velocity and allows the foam to slide down the tank wall. FOAM CHAMBER MODEL - FC PAGE OF 6 2 a) Number of Foam Chamber The number of foam chambers required is determined by the tank diameter. Where two or more foam chambers are required, they shall be spaced equally around the tank periphery and each Foam Chamber shall be sized to deliver foam at an approximately same rate. Please refer graph to select the unit that will provide the required minimum foam solution application rate at the available operating pressure of the Foam Chamber. For minimum number of Foam Chamber requirement, kindly follow the recommendations as per NFPA/OISD/TAC or as per the governmental codes or ordinances wherever applicable. b) Minimum Foam Solution Application Rate The minimum foam solution application rate is the rate at which the water and foam concentrate in correctly proportioned ratio should be delivered to the surface of a storage tank under protection to control and extinguish the fire. For minimum application rate requirement follow the recommendations as per NFPA/OISD/TAC or governmental codes or ordinances wherever applicable.

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  • Xe phun foam di động

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    APPLICATION

    Mobile Foam Unit is used for effective quick aplication of foam to fight spill fires in high risk areas such as storage tanks, loading terminals, port areas and similar high risk zones.

    SPECIFICATION

    It is a self contained unit with foam inductor, foam branch pipe, foam concentrate storage tank, and two length of fire hoses. It requires only connection to a suitable water supply. It is easy to operate, move and requires minimum manpower. Foam concentrate storage tank is made out of fiber glass / stainless steel or steel with internal lining. The foam branch pipe and fire hoses are mounted on the concentrate storage tank. The foam inductor is clamped rigidly on the storage tank. The complete unit is mounted on two wheels with a handle for easy movement.

    TESTING AND MAINTENANCE

    After few initial successful tests, an authorised person must be trained to perform inspection and testing of the unit. It is recommended to carry out physical inspection of the unit, the inspection should verify that no damage has taken place to any component of the unit. Each unit must be operated with full flow frequently in accordance to the guidelines of the organisation having local jurisdiction. The owner is responsibe for maintaining the equipment in proper operating condition. CAUTION: Appropriate guidance and training must be given to authorised person for proper operation of equipment Application of water or foam on an electric appliance can cause injury. The water supply to unit must be increased gradually, a sudden surge of water supply to the unit must be avoided.

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  • Bộ tạo foam

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    APPLICATION

    Foam Maker is used in one of the most common application to protect tank seal in vertical liquid storage tank with internal floating roof with low expansion foam system. The application of aspirated foam is on the basis of the risk comprising the area in the annular ring between the rim of the floating roof and the tank shell. The Foam system design guidelines generally used are in accordance with NFPA 11 standard. The Foam Makers are defined by NFPA 11 as Type II discharge outlets for delivering the low expansion aspirated foam to the seal. The Foam Makers are widely used with the Inline foam inductor, Balance pressure foam proportioning system, Bladder tank system or Foam tenders.

    SPECIFICATION

    Foam Maker is an air aspirating foam generator connected to the foam pourer to deliver the aspirated foam gently into the tank seal area. Foam maker covers wide range of foam solution rates from 75 to 1200 litres per minute at 2.8 to 7 kg/sq.cm inlet pressure. Each foam maker is supplied with an orifice plate, designed for the required flow at inlet pressure. The orifice is field replaceable in the event of change in design parameters. The foam is produced by introducing air into the foam solution stream. The inlet of foam maker is designed to create venturi jet which draws air into the foam solution stream. The air is drawn into the foam solution through holes located on the foam maker covered with stainless steel screen to exclude nesting birds and insects. The aerated foam is directed into the pourer for the gentle application of the expanded foam. The pourers are available in different models.

    SYSTEM DESIGN REQUIREMENT

    For essential requirement of appropriately designed foam pouring system for storage tanks refer NFPA-11 / OISD-117 / TAC / Governmental codes or ordinances wherever applicable. a) Minimum Number of Foam Makers The maximum spacing between two foam makers shall be 24.4 metres for foam dam height of 610mm and 12.2 metres for foam dam height of 305mm. ( Refer NFPA-11 ) When two or more foam makers are required they shall be spaced equally around the tank periphery and each foam maker shall be sized to deliver foam at the same rate. As per reference to OISD-117 standard maximum spacing between two foam makers shall be 24 metres of shell perimeter based on 600mm foam dam height and minimum of two Foam Makers are to be provided.

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  • Bộ cân bằng áp lực tạo foam

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    APPLICATION

    The inline balance pressure foam proportioners are used with positive displacement foam concentrate supply pump . The system controls accurately the flow of foam concentrate into the water stream over a wide range of flow rate and pressure. The Inline Balance Pressure Foam Proportioning System is used for simultaneous operation of the multiple foam injection even with different pressures between the two injection point with a single concentrate supply line. Various sizes of inline balance pressure proportioner can be combined to suit the flow requirement of each hazard area.

    SPECIFICATION

    Inline balance pressure proportioning system utilizes a single, positive displacement foam concentrate supply pump, an atmospheric foam concentrate storage tank, inline balance proportioner, and a foam concentrate regulating valve. The pressure regulating valve is mounted on foam concentrate return line to the foam concentrate storage tank. The valve regulates the foam concentrate supply pressure. The Inline balance pressure proportioner consists of a ratio controller, diaphragm operated pressure balancing valve, water and foam gauges, and pressure sensing hose of teflon tube with stainless steel braided cover, interconnecting trim fittings with various control and flush valves. The water inlet pressure and foam concentrate pressure at metering orifice is sensed by a diaphragm valve and it automatically balances the concentrate supply to provide accurately proportioned water foam solution over a wide range of flow conditions. A foam concentrate supply valve is also provided as an optional item. The system requires foam concentrate supply pressure of 1.5- 2.0 bar. higher than the water supply pressure. The Inline balance pressure proportioner is also provided with a manual balancing valve.

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  • foam sprinkler

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    TECHNICAL DATA : Model F Mounting Pendent Maximum Working 12.3 Kg. Sq. Cm (175 PSI) Pressure Operating Pressure 2.0 Bar (30 PSI) minimum 4.2 Bar (60 PSI) maximum End Connection 1/2" BSPT (1/2" NPT Optional) Material Brass and Bronze K-Factor K-42 standard Other K-factor can be provided as optional Weight 0.750 Kg. Ordering Information Please specify : Model, End connection and Material

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  • Tank trộn foam

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    APPLICATION

    The Bladder Tank Foam Proportioning System utilises the water pressure to inject foam concentrate into a water supply and automatically proportions foam concentrate over wide range of flow and pressure, with very low pressure drop. This system does not require concentrate supply pump.

    SPECIFICATION

    The Bladder Tank Foam Proportioning System are available with vertical and horizontal bladder tanks. The carbon steel tanks are designed and constructed in accordance with ASME Code Section VIII for unfired pressure vessels. The maximum working pressure is 12 Bar (175 psi) and factory tested for 18 Bar (261 psi). The vertical tank assembly is supported by a continuous skirt with provision for anchoring. The horizontal tanks are supported by two saddles welded to the tank and drilled for anchoring. Tank is provided with lifting lugs. The system is supplied with pressure vessel, bladder, fill and drain valve for water and foam concentrate, ratio controller and vent valve. The ladder and sight glass assembly is supplied as optional item on request.

    PRINCIPAL OF OPERATION

    The foam concentrate is to be filled into the bladder very carefully to avoid rupture of the bladder. The instructions for filling are provided with the equipment. Once the main water flow is established and water inlet and foam outlet valves are opened, the water enters the area between vessel wall and bladder, applying pressure to the bladder. The foam concentrate is forced out of the bladder through the BLADDER TANK PROPORTIONING SYSTEM PAGE OF 4 2 foam outlet pipe and into the ratio controller through metering orifice. The concentrate pressure and water inlet pressure at ratio controller will be same, as the main water supply pressure is utilised to expel the foam from the bladder. The water flowing through the ratio controller jet creates a low pressure area common both to down stream water and foam concentrate. This injects the concentrate in to the ratio controller through an accurate sized orifice proportioned to water venturi. This ensures correct proportioning over a wide range of flow condition. The bladder tank proportioning system operates on same principle as that of a balance pressure proportioning system. In bladder system, the bladder is used as diaphragm to separate the water and foam concentrate within the tank. The foam concentrate is injected into the ratio controller utilising water pressure. The system is also supplied with foam concentrate control valve as an optional item. The valve allows concentrate flow only when minimum of 3.0 kg/sq.cm. water pressure is established in the system. For pressure drop and flow characteristics refer catalogue of ratio controller.

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  • Foam chữa cháy

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    PHYSICAL & CHEMICAL PARAMETERS
    Property 3% 6%
    Appearance Amber coloured liquid Amber coloured liquid
    pH @ 20 ºC 6.5 - 8.5 6.5 - 8.5
    Sp. Gravity @ 20 ºC 1.00 to 1.03 1.00 to 1.03
    Freezing Point 0 ºC 0 ºC
    Viscosity @ 20 ºC Less than 5 cSt Less than 5 cSt Less
    Sediment Maximum 0.25% Maximum 0.25%
    *Expansion Ratio >= 7:1 >= 7:1
    *Drainage (25 %) >= 2min >= 2min

     

     

    AFFF trở thành một chọn lựa để dùng chữa cháy cho các sân bay, nhà máy lọc dầu, nhà máy sản xuất, phòng cứu hỏa thành phố, và bất cứ trong lĩnh vực hoạt động nào liên quan tới sự vận chuyển, xử lý, giao nhận các chất lỏng dễ cháy.

     

    Foam chữa cháy AFFF tỉ lệ 3%,6%

    Đặc điểm: Bình Foam có cấu trúc đơn giản, hoạt động ổn định và ứng dụng thuận tiện, với khả năng dập lửa nhanh, hiệu quả cao liên tục trong suốt quá trình phun.

    Ứng dụng: Chữa cháy do dầu, xăng, hơi gas và do phát sinh tia lửa điện. Sản phẩm được sử dụng rộng rãi ở các nhà máy, tàu thuyền,trạm bơm xăng, trạm biến thế, trạm viễn thông BTS và những nơi có chứa hoá chất.

    Hệ Thống Chữa Cháy Foam

    Foam chữa cháy AFFF tỉ lệ 3%,6%

    Hệ thống chữa cháy bằng bọt (foam), khi được kích hoạt, sẽ phun ra một loại bọt bao phủ lên trên bề mặt xăng dầu, tách chất lỏng dễ cháy ra khỏi không khí và lửa, nhờ đó ngọn lửa bị dập tắt.

    Do tính chất hữu hiệu của nó, đồng thời do nó giảm thiểu lượng nước cần dùng, hệ thống foam hiện nay được tin dùng rộng rãi. Giảm số lượng chất chữa cháy cần dùng để dập tắt lửa, nghĩa là giảm thiểu sự hư hỏng thiết bị, đồ dùng, giảm ô nhiễm môi trường do nước phun ra, đặc biệt là tại những nơi có chứa chất độc hại.

    Đối với loại foam giãn nở cao, thì hầu như chẳng hư hại gì cả cho hàng hóa, và chỉ trong một thời gian ngắn, cả nhà kho đều trở lại bình thường.

    Hệ thống foam được ứng dụng tại những nơi đặc biệt có rủi ro cao về cháy nổ, được chọn lựa thận trọng, yêu cầu phải trang bị thích hợp chất bọt cô đặc, hệ thống trộn bọt, các thiết bị phun bọt, và sự phối hợp hưu hiệu giữa các bộ phận ấy trong một hệ thống chữa cháy.

    Bọt cô đặc là một chất đối chọi với xăng dầu. Mặc dù nó có cùng chung tiêu chuẩn, tuy nhiên, mỗi loại bọt - protein và fluoroprotein - có những đặc điểm riêng, ứng dụng thích hợp hoặc kém thích hợp hơn đối với từng hiện trường cụ thể.

    Hệ thống trộn bọt có thể là loại "balanced pressure" hoặc "inline".

    Đầu phun bọt có thể là đầu sprinkler, spray, nozzle, monitor, foam pourer, hoặc high expantion foam generator, tùy theo hệ thống foam được dùng.



    Nguyên Lý Chữa Cháy

    Tùy theo loại bọt, foam có thể chữa cháy bằng nhiều cách:

    Hoặc là dùng bọt foam phủ trùm lên trên bề mặt chất cháy một lớp bọt dày, dập tắt ngọn lửa và cách ly nhiên liệu không cho tiếp tục tiếp xúc với không khí, hoặc là làm lạnh nhiên liệu bằng lượng nước có chứa trong bọt, hoặc là trùm phủ không cho chất lỏng (nhiên liệu) bốc hơi và hòa trộn vào không khí.



    Bọt Chữa Cháy Foam là gì?



    Nói đơn giản, bọt chữa cháy là một mãng bọt có khối lượng lớn, có tính bền, chứa đầy không khí, có tỷ trọng nhỏ hơn dầu, xăng, hoặc nước. Foam được tạo ra bởi 3 thành phần: nước, bọt cô đặc, và không khí. Nước được trộn với bọt cô đặc, tạo thành một dung dịch foam. Dung dịch này lại được trộn với không khí (hút không khí) để tạo ra một loại bọt chữa cháy có đủ tính năng, sẵn sàng phun lên bề mặt vật gây cháy và dập tắt cháy.



    Vài Loại Bọt (thông dụng):

    Foam AFFF là chất bọt mà sẽ tạo ra một màn sương phủ trên mặt phẳng của nhiên liệu có hydrocarbon.

    Foam ARC (alcohol-resistant concentrate) là chất bọt mà sẽ tạo ra một màn nhấy trên mặt phẳng của loại nhiên liệu không hòa tan.
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