GB 50151-2021 English PDFUS$1499.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email. GB 50151-2021: Code for installation and acceptance of foam extinguishing systems Status: Valid GB 50151: Historical versions
Basic dataStandard ID: GB 50151-2021 (GB50151-2021)Description (Translated English): Code for installation and acceptance of foam extinguishing systems Sector / Industry: National Standard Classification of Chinese Standard: P16 Word Count Estimation: 235,272 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; State Administration for Market Regulation GB 50151-2021: Code for installation and acceptance of foam extinguishing systems---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.1 General 1.0.1 This standard is formulated in order to reasonably design the foam fire extinguishing system, ensure its construction quality and use function, reduce fire hazards, and protect personal and property safety. 1.0.2 This standard is applicable to the design, construction, acceptance and maintenance management of foam fire extinguishing systems installed in new construction, reconstruction and expansion projects. This standard does not apply to foam fire extinguishing systems installed in ships, offshore oil platforms and other places. 1.0.3 The foam fire extinguishing system should not be used in places containing the following substances. 1 Nitrocellulose, explosives and other chemical substances and strong oxidants that can still be oxidized rapidly in an air-free environment; 2 Potassium, sodium, alkylaluminum, phosphorus pentoxide and other active metals and chemical substances that react dangerously with water. 1.0.4 The air foam fire extinguishing system should not be used for low-boiling flammable liquid storage tanks with a boiling point lower than 45°C and a molar percentage of carbon 5 and below components not less than 30%. 1.0.5 The design, construction, acceptance and maintenance management of the foam fire extinguishing system shall not only implement the provisions of this standard, but also comply with the relevant current national standards. 2 termsⅠ General terms 2.0.1 Foam concentrate A concentrated liquid that can be mixed with water in suitable mixing ratios to form a foam solution. 2.0.2 Foam solution A foam solution prepared by mixing foam liquid and water in a specific mixing ratio. 2.0.3 Premixed foam solution The foam solution and water are pre-configured according to a specific mixing ratio to store the foam solution for use. 2.0.4 Mixing ratio concentration The volume percentage of the foam liquid in the foam mixture. 2.0.5 Foam expansion ratio The ratio of the foam volume to the volume of the foam mixture that forms the foam. 2.0.6 Low-expansion foam Fire extinguishing foam with expansion ratio lower than 20. 2.0.7 medium-expansion foam Fire extinguishing foam with expansion ratio between 20 and.200. 2.0.8 high-expansion foam Fire extinguishing foam with an expansion ratio higher than.200. 2.0.9 supply intensity application rate (density) The supply volume of foam mixture or water per unit area per unit time, expressed in "L/(min·㎡)". 2.0.10 fixed system fixed system A fire extinguishing system consisting of a fixed foam fire pump, a foam proportional mixer (device), a foam generator (or sprinkler) and pipelines. 2.0.11 semi-fixed system semi-fixed system A fire extinguishing system consisting of a fixed foam generator and some connecting pipes, a foam fire truck or a mobile fire pump, a foam proportional mixer, and a water belt connection. 2.0.12 mobile system mobile system A fire extinguishing system consisting of a fire engine, a motorized fire pump or a pressurized water source, a foam proportional mixer, a foam gun, a foam cannon or a mobile foam generator, and a water hose. 2.0.13 balanced pressure proportional mixing device balanced pressure proportio-ning set A separate foam liquid pump injects foam liquid into the pressure water flow according to the set pressure difference, and passes through a balance valve, an orifice or a Venturi tube (or a combination of an orifice plate and a Venturi tube), and it can be used at a certain water pressure and flow rate. A proportional mixing device that automatically controls the mixing ratio within a certain range. 2.0.14 Mechanical pump-in proportional mixing device coupled water-turbinedriven pump proportioning set The blade-type or turbine-type water turbine is connected to the foam liquid pump through a coupling, and the pressure water supplied by the foam fire-fighting water pump drives the water turbine, so that the foam liquid pump injects foam liquid into the foam fire-fighting water pipeline behind the water turbine according to the set ratio. proportional mixing device. 2.0.15 pump direct injection pro-portioning The foam liquid pump directly injects the foam liquid into the system water flow according to the set ratio and mixes the process. 2.0.16 bladder pressure proportional mixing device bladder pressure proportio-ning tank The pressure water discharges the foam liquid from the capsule of the closed storage tank by means of an orifice plate or a Venturi tube, and mixes it with water in proportion. 2.0.17 in-line eductor Venturi fitting installed in the water supply line to the foam generator. 2.0.18 Air-aspirating discharge device Using the Venturi tube principle, air is sucked into the foam mixture and mixed to generate foam, and then the foam is sprayed out in a specific pattern, such as foam generators, foam guns, foam guns, foam sprayers, etc. 2.0.19 Non air-aspirating discharge device There is no air suction mouth, using foam mixtures such as water film forming, and its spray mode is similar to water spraying devices, such as water guns, water cannons, sprinklers, etc. 2.0.20 Foam system water supply pump Firefighting pumps for supplying water to foam fire suppression systems. 2.0.21 Foam concentrate supply pump A pump that supplies foam liquid to a foam fire extinguishing system. 2.0.22 Foam system pump station Place where foam fire pumps are installed. 2.0.23 foam station There is no foam fire pump, and only foam proportional mixing devices, foam liquid storage tanks, etc. are installed. Ⅱ Terminology of low expansion foam fire extinguishing system 2.0.24 Surface application system of liquid injection system The foam is sprayed from the liquid surface into the fire extinguishing system in the protected storage tank. 2.0.25 subsurface injection system The foam is sprayed from below the liquid surface into the fire suppression system inside the protected storage tank. 2.0.26 Vertical foam generator foam maker in standing position A foam generator installed vertically on the tank wall of Class A, B, and C liquid vertical storage tanks. 2.0.27 horizontal foam generator foam maker in horizontal position Foam generators installed horizontally on external floating roof tanks. 2.0.28 High back-pressure foam maker high back-pressure foam maker When the pressurized foam mixture passes through, it can inhale air to produce low-expansion foam, and the device has a certain pressure (gauge pressure) at the outlet. 2.0.29 Foam guiding cover Installed on the top of the outer floating roof tank wall, it is a device that can make foam flow down the tank wall and prevent foam loss. 2.0.30 Foam buffering cover Installed at the outlet of the foam generator of the fixed roof or internal floating roof storage tank, it is a device that guides the foam to slowly release down the tank wall to the surface of the water-soluble liquid or the single-disc or double-disk annular sealing area. Ⅲ Terminology of Medium Expansion and High Expansion Foam Fire Extinguishing Systems 2.0.31 Total flooding system total flooding system A fire extinguishing system in which foam is sprayed directly or through a foam guiding cylinder into a closed or enclosed protection area by a fixed foam generator, and a certain foam submersion depth is reached within a specified time. 2.0.32 local application system A fire extinguishing system that sprays foam to the fire site directly or through a foam guiding cylinder from a fixed foam generator. 2.0.33 Enclosed space enclosure A space contained by non-combustible or non-combustible objects. 2.0.34 Foam supply rate foam application rate The total volume of foam supplied per unit time, expressed in "m3/min". 2.0.35 Foam distribution duct A guide cylinder that delivers high-expansion foam from the outlet of the foam generator to the protected area. Ⅳ Terminology of Foam-Water Spray System and Foam Spray System 2.0.36 Foam-water sprinkler system foam-water sprinkler system It consists of sprinkler head, alarm valve group, water flow alarm device (water flow indicator or pressure switch) and other components, as well as pipelines, foam liquid and water supply facilities, and can spray foam to the protection area in sequence according to the predetermined time and supply intensity in case of fire Automatic fire extinguishing system with water. 2.0.37 Foam-water deluge system Use the open sprinkler head, and the foam-water sprinkler system is controlled by the automatic fire detection system installed in the same area as the sprinkler head. 2.0.38 Closed foam-water spray system closed-head foam-water sprinkler system Foam-water sprinkler systems using closed sprinklers, including foam-water preaction systems, foam-water dry systems and foam-water wet systems. 2.0.39 Foam-water preaction system foam-water preaction system After a fire occurs, the fire detection system installed in the same area as the sprinkler will control and open the relevant equipment and components, so that the fire extinguishing medium will fill the system pipes, and the closed foam-water sprinkler system will spray foam and water sequentially from the opened sprinkler. 2.0.40 Foam-water dry pipe system The closed foam-water spray system is controlled by the air or nitrogen with a certain pressure in the system pipeline. 2.0.41 Foam-water wet pipe system The closed foam-water spray system is controlled by the pressurized foam premix or water filled in the system pipeline. 2.0.42 foam spray system foam spray system It is an automatic fire extinguishing system that uses centrifugal atomization water mist nozzles to spray foam to the protected equipment or protection area according to the predetermined time and supply intensity when a fire breaks out. 2.0.43 total design area The maximum calculated protected area of a closed foam-water sprinkler system.3 Foam Fluids and System Components3.1 General provisions 3.1.1 Foam liquid, foam fire pump, foam liquid pump, foam proportional mixer (device), pressure vessel, foam generating device, fire detection and start control device, control valve and pipeline, etc., shall be selected in accordance with the current relevant national standards product. 3.1.2 The main components of the system should be painted according to the following regulations. 1 Foam fire pumps, foam liquid pumps, foam liquid storage tanks, foam generators, foam liquid pipes, foam mixture pipes, foam pipes, pipe filters, etc. should be painted red; 2 The water supply pipeline should be painted green; 3 When there are many pipelines, and there is a contradiction between the coloring of the foam system pipeline and the process pipeline, the corresponding color band or color ring can be painted; 4 Concealed engineering pipelines may not be painted. 3.2 Selection and storage of foam solution 3.2.1 The selection of foam liquid for non-water-soluble Class A, B, and C liquid storage tanks for fixed low-expansion foam fire extinguishing systems shall meet the following requirements. 1.3% fluoroprotein or aqueous film-forming foam should be used; 2 For environmentally sensitive areas near the red line of ecological protection, drinking water sources, permanent basic farmland, etc., 3% fluoroprotein foam liquid without strong acid and alkali salt should be used; 3 When the aqueous film-forming foam liquid is selected, the fire resistance level of the foam liquid should not be lower than grade C. 3.2.2 Foam-water spray system, foam gun system and foam gun system foam liquid for protection of non-water-miscible liquids shall meet the following requirements. 1 When using an air-breathing foam generating device, 3% fluoroprotein and aqueous film-forming foam liquid can be used; 2 When using a non-breathing spray device, a 3% aqueous film-forming foam liquid should be used 3.2.3 For water-soluble Type A, B, and C liquids and other Types A, B, and C liquids that have destructive effects on ordinary foams, water-resistant film-forming, fluoroprotein-resistant or low-viscosity fluoroprotein-resistant foams must be selected. liquid 3.2.4 When both water-soluble liquid and non-water-soluble liquid are stored in the protected place, the selection of foam liquid should meet the following requirements. 1 When the single-tank capacity of the storage tanks in the storage tank area is less than or equal to 10,000m3, anti-solubility water film-forming, anti-solubility fluoroprotein or low-viscosity anti-solubility fluoroprotein foam liquid can be used; For storage tanks, the corresponding foam liquid should be selected for water-soluble liquid storage tanks and non-water-soluble liquid storage tanks according to the provisions of Article 3.2.1 and Article 3.2.3 of this standard. 2 When the foam-water spray system is used in the protection site, the anti-solvent water film-forming and anti-solvent fluoroprotein foam liquid should be selected. 3.2.5 The fixed medium-expansion or high-expansion foam fire extinguishing system should use 3% foam liquid. 3.2.6 When seawater is used as the system water source, the foam liquid suitable for seawater must be selected 3.2.7 The foam solution should be stored in a dry and ventilated room or in an open shed; the ambient temperature of the storage should meet the requirements for the use temperature of the foam solution. 3.3 Foam fire pump and foam liquid pump 3.3.1 The selection and setting of the foam fire pump shall meet the following requirements. 1 A water pump with a gentle characteristic curve should be selected, and its working pressure and flow should meet the system design requirements; 2 A pressure gauge and a one-way valve should be installed on the pump outlet pipeline, and a pressure-maintaining pressure relief valve and a return pipe with a manual control valve should be installed on the pump outlet main pipeline; 3 When the foam liquid pump is driven by a water turbine that does not leak water to the outside, the pressure loss of the water turbine shall be included in the head of the foam fire pump; when the foam liquid pump When the water turbine that discharges water is used to drive, the water flow consumed by the water turbine shall be included in the rated flow of the foam fire pump. 3.3.2 The selection and setting of the foam liquid pump shall comply with the following regulations. 1 The working pressure and flow rate of the foam liquid pump should meet the design requirements of the system, and at the same time, it should be ensured that the foam liquid supply pressure is greater than the water supply within the design flow range pressure; 2 The structural form, sealing or packing type of the foam liquid pump shall be suitable for transporting the selected foam liquid, and its material shall be corrosion-resistant to the foam liquid and shall not affect the foam liquid performance; 3 When used for ordinary foam liquid, the allowable suction vacuum height of the foam liquid pump shall not be less than 4m; The suction vacuum height shall not be less than 6m, and the length of the pipe between the foam liquid storage tank and the foam liquid pump shall not exceed 5m, and the length of the foam liquid pump outlet pipe shall not exceed 5m. It should not exceed 10m, and the foam liquid pump and pipeline should not be filled with foam liquid at ordinary times; 4 In addition to the foam system set up in independent oil depots and oil product stations at level 4 and below, and in a single non-important protection area with a protection area of less than.200m2, a Standby pump, and when the working pump fails, it should be able to automatically and manually switch to the standby pump; 5 The foam liquid pump should be able to withstand no-load operation for not less than 10 minutes 3.3.3 The power source of the foam liquid pump shall meet the following requirements. 1 Under the conditions stipulated in paragraphs 1 to 3 of Article 7.1.3 of this standard, when the foam fire extinguishing system and the fire cooling water system share a group of fire feed water pumps When the foam liquid pump is used as the power source, the motor should be used as the power source of the foam liquid pump, and the water turbine should be used as the power source of the standby foam liquid pump; When the fire-fighting water supply pumps of the cooling water system are set separately, the power source of the main and standby foam liquid pumps shall be a water turbine or a group of pumps shall adopt an electric motor, The other set of pumps uses water turbines; 2 Under other conditions, when the foam fire extinguishing system needs to be equipped with a standby foam liquid pump, the main and standby foam liquid pumps can all use the primary power supply load electric machine drag; 3 When the power source for driving the foam liquid pump adopts a blade-type or turbine-type water turbine that does not leak water to the outside, the water turbine and parts shall be made of corrosion-resistant material. 3.4 Foam proportioner (device) 3.4.1 The selection of foam proportional mixing device should meet the following requirements. 1 For a fixed system, a balanced, mechanical pump-in, bladder-type pressure proportional mixing device or pump direct injection proportional mixing process should be selected. The mixing ratio type should be consistent with the selected foam liquid, and the mixing ratio should not be less than the rated value; 2 For fixed-roof storage tanks, external floating-roof storage tanks, and internal floating-roof storage tanks with a single tank capacity not less than 5000m3, a balanced or mechanical pump-in proportional mixing device should be selected; 3 For the fully submerged high-expansion foam fire extinguishing system or the partial application of medium-expansion and high-expansion foam fire-extinguishing systems, mechanical pump-in, balanced or bladder pressure proportional mixing devices shall be selected; 4 The foam-water spraying system with equal or similar flow rates of the foam mixture in each zone should adopt the pump direct injection proportional mixing process; 5 For the foam spray system protecting oil-immersed transformers, a bladder-type pressure proportional mixing device can be selected. 3.4.2 When a balanced proportional mixing device is used, it shall comply with the following regulations. 1 The inlet pressure of the foam liquid of the balance valve should be greater than the inlet pressure of the water, and the pressure difference should meet the requirements of the product; 2 A one-way valve should be installed on the foam liquid inlet pipe of the proportional mixer; 3 Flushing and venting facilities shall be provided on the foam liquid pipeline. 3.4.3 When a mechanical pump-in proportional mixing device is used, it shall comply with the following regulations. 1 A one-way valve should be installed on the foam liquid inlet pipeline; 2 The foam liquid pipeline shall be provided with flushing and venting facilities. 3.4.4 When the pump direct injection proportional mixing process is adopted, the following regulations shall be met 1 The foam liquid flow pressure at the foam liquid injection point should be 0.2MPa greater than the water flow pressure; 2 A one-way valve should be installed on the foam liquid inlet pipeline; 3 Flushing and venting facilities shall be provided on the foam liquid pipeline. 3.4.5 When adopting bladder type pressure proportional mixing device, it shall comply with the following regulations. 1 The single tank volume of t......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50151-2021_English be delivered?Answer: Upon your order, we will start to translate GB 50151-2021_English as soon as possible, and keep you informed of the progress. 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