1, multi-storey building, the total water consumption for indoor and outdoor fire fighting of fire hydrants exceeds 25L/s, and now municipal tap water inlet pipes are designed, and outdoor fire fighting pools are set up (meeting the total water consumption for indoor and outdoor fire fighting). Indoor fire hydrant water is pumped and pressurized from the fire pool, and outdoor fire hydrant water is connected to the municipal tap water supply network of the base. Is this feasible?
Answer: Although the municipal tap water supply pipe network in the project base is connected with the outdoor fire hydrant, there is only one municipal tap water inlet pipe, so the outdoor fire water still needs to be supplied by the fire pool. The protection radius of the water intake of the fire pool should not be greater than 150 m (the protection radius of the water intake of the fire pool in high-rise buildings should not be greater than100m); The water absorption height of fire engines should not be greater than 6 m. When the above conditions cannot be met, outdoor fire water supply pumps and outdoor fire hydrants should be set up.
2. There is no indoor fire hydrant in Class D workshop, and the water consumption of outdoor fire hydrant is 20L/S, and the water flows all the way. According to Article 8.6.2 of the Building Code, is it necessary to set up a pool without fire fighting?
Answer: When the water consumption of outdoor fire hydrants is 20L/S in Class D workshops with less combustible materials, according to paragraph 2 of Article 8.6. 1 of the Building Code, there is no need to set up a fire pool.
3. For the fire pool that stores outdoor fire water consumption, whether the water intake of the fire pool should be set when the outdoor fire hydrant is equipped with the outdoor fire water storage lift pump.
A: No need.
4. With regard to the fire-fighting pool, the distance between the water intake in Article 8.6.2 of the building code and the building should not be less than 15m (which is often difficult to achieve in design), while Article 7.3.4 of the high code GB 50045-95 is 5m. How to distinguish?
Answer: Paragraph 6 of Article 10.2.2 of the Water Conservation Regulations has been unified as: it should not be less than 5 m. ..
5. Article 7.3.4 of "High Code": The water depth of the water intake well of the fire fighting pool for water absorption by fire engines shall ensure that the water absorption height of the fire fighting pump shall not exceed 6m. Is it the highest water level or the lowest water level?
A: It refers to the lowest water level.
6. For the layout of outdoor fire hydrants, Paragraph 4 of Article 8.2.8 of Building Code stipulates that the protection radius of outdoor fire hydrants is 150m. Is this a walking distance or a protective radius? Do you want to wrap all the buildings?
A: It is the protection radius, and all buildings should be within the protection radius.
7. For the distance between outdoor fire hydrants, the Building Code clearly states that it should not be greater than 120m, while the High Code does not. For high-rise buildings, is it wrong to calculate the distance between outdoor fire hydrants exceeding 120m? Of course, Paragraph 2 of Article 6.3.3 of Water Saving Regulations clearly stipulates that the outdoor hydrant spacing should not be greater than 120m, but this specification is local.
A: Projects in Jiangsu Province should implement the Regulations on Water Conservation. According to the second paragraph of Article 6.3.3 of Water Conservation Regulations, the outdoor fire hydrant spacing of high-rise buildings should not be greater than 120m.
8. For a building with a manned basement, if there is a fire pool and a fire pump room, it is located in a non-civil air defense area. Is it necessary to set up independent fire pools and pressurized pump rooms for civil air defense projects in civil air defense areas according to the provisions of Articles 7.4. 1 and 7.4.2 of Code for Civil Air Defense Fire Prevention?
A: Articles 7.4. 1 and 7.4.2 of the Code for People's Fire Protection do not stipulate that civil air defense projects should have independent fire pools and pressurized pump rooms. Civil defense areas and non-civil defense areas can share fire control facilities.
9, food (non-cabinet) cold storage, when the indoor fire hydrant is set outside the cold storage, can not meet the needs of two full water columns to reach any part of the cold storage, how to deal with it?
Answer: According to the practice of setting indoor fire hydrants in non-heating buildings in cold areas, dry system can be used for food (non-cabinet) cold storage, but a quick opening and closing device should be set on the water inlet pipe and an automatic exhaust valve should be set on the top of the pipeline.
10. How to arrange indoor fire hydrants in commercial service outlets at the bottom of residential buildings?
A: For provincial projects, the following methods can be adopted:
(1) is arranged on the external wall of commercial service outlets;
(2) At least one single outlet hydrant is set at the bottom of the commercial service outlets of each unit, and it is calculated whether the full water column of the hydrant and the commercial service outlets of adjacent units can reach any part of the commercial service outlets. If a commercial service outlet has a second floor with internal stairs, it should be counted to any part of the second floor. When a fire hydrant on the ground floor cannot meet the above requirements, a single outlet fire hydrant can be set on the upper and lower floors or two single outlet fire hydrants can be set on the ground floor.
(3) Commercial service outlets cannot reduce the number of plugs by setting double valves and double sockets, so as to meet the requirement that two water columns can reach any part of the room.
1 1 Article 8.3.4 of the Provincial Commercial Regulations, small commercial parallel stores on the third floor should be provided with closed stairwells. Excuse me, how to set fire hydrants to ensure that the full water columns of two water guns reach any part of the room at the same time?
Answer: There should be at least one single outlet fire hydrant on each floor of the parallel store, and it must be calculated whether the whole water column of the fire hydrant and its upper or lower fire hydrant can reach any part of the parallel store.
12. The design descriptions of some large-scale production workshops (with large area and volume) do not specify the product types, process flow and relevant parameters of production personnel, but simply state that the workshop fire risk is determined as "D, E and C". How to review them? Is it necessary for designers to provide definite basis?
Answer: The fire protection design of the workshop must specify the fire hazard categories produced. The Class D and Class E workshops should explain the combustible substances in the workshop and what products should be produced in the Class C workshop. The fire protection design of the warehouse should specify the types of stored items, storage types (stacking, single-row shelves, double-row shelves), storage height, etc. Not clear can't audit, designers to supplement the material after the audit.
13. Can the yarn-dyed workshop, fermentation workshop and brewing workshop determine the fire risk classification as "D"? Is it necessary for designers to provide definite basis?
Answer: (1) The yarn-dyed production workshop refers to the garment processing workshop; The fermentation and brewing workshop of winery refers to the feed processing workshop, and the fire risk of its production should be determined as Class C. ..
(2) If the products produced in the workshop are not listed in the clause description table of Building Code 1, or there is no reference of the same type, the designer shall provide the basis for determining the classification of production fire risk, such as the opinions of the local fire department.
14. how to calculate the fire water consumption when the factory building is built next to the affiliated office building? Is it calculated by factory building or by civil building?
Answer: (1) When the factory building and the affiliated office building meet the requirements of no fire separation between the two buildings, the factory building is designed as an industrial building, and the affiliated office building is designed as a civil building.
(2) When the factory building and affiliated office building are designed as one building, they shall be calculated as industrial buildings and civil buildings respectively, whichever is the greater.
15. The non-civil air defense basement under the multi-storey residence is a bicycle garage, and the superstructure meets the requirement of not setting indoor fire hydrants. Problem: (1) The total construction area is more than 300 m2 and less than 500 m2. Is it necessary to install indoor fire hydrant? (2) The total construction area is more than 500 m2 (for example, 2000 m2), but it is divided into several fire zones less than 500 m2. Is it necessary to set up an automatic sprinkler system?
Answer: (1) The bicycle garage belongs to Class E warehouse. According to the notes in Article 8.3. 1 of the Building Code, there is no need to set indoor fire hydrants in bicycle garages.
(2) No automatic sprinkler system is needed.
16, 100 m below a class of high-rise residential buildings, the basement has a local water pump room with an area of less than 200 m2 (with a separate outlet leading to the outdoor ground), which is separated from other basements by a firewall. Can there be no fire hydrant?
Answer: According to Article 4.0.2 1 of Water Conservation Regulations, fire hydrants should be installed indoors.
17. Is it necessary to set up an indoor fire hydrant system in the multi-storey building on the top floor of commercial residential buildings?
Answer: According to Article 3.0.6 of the Regulations on Water Conservation, residential buildings and commercial buildings in multi-storey buildings are designed for fire protection respectively.
The commercial and residential buildings in the third paragraph of Article 4.0.2 of the Code for Water Conservation are not applicable to multi-storey buildings.
(1) Commercial: According to the provisions of Paragraph 2 and Paragraph 8 of Article 4.0.2 and Paragraph 5 of Article 8. 1. 1, an indoor fire hydrant system should be installed when the following conditions are met: commercial volume > 5000m3, floor area of commercial buildings >/kloc-. The total area of commercial buildings is more than 3000m2. This enterprise is equipped with central air conditioning.
(2) Residence: According to Article 4.0.2, paragraph 5 of the Water Conservation Regulations, when the total number of floors is ≤7, the residence may not be equipped with an indoor fire hydrant system; When the total number of floors is more than 7 floors, the house should be equipped with indoor fire hydrant system. (See Note 8. 1.3 of the Provincial Regulations for the floor calculation method).
18, multi-storey building, the business area of single commercial building on the ground floor is less than 200m2, the volume of commercial part is less than 500m3, and the total volume is more than 500m3 and less than 10000 m3. According to article 8.3. 1 of the Building Code, there is no clear requirement for indoor fire hydrants. Do you want to set up indoor fire hydrants?
A: Similar projects must be designed according to the total volume.
According to the second paragraph of Article 4.0.2 of Water Saving Regulations, indoor fire hydrant system should be set when the commercial volume is more than 5000 m3, and it cannot be simply considered that the total volume is less than 10000 m3 without indoor fire hydrant system.
19. For multi-storey exhibition buildings with a volume of more than 50,000m3, according to Article 7.5.2 of the Water Conservation Regulations, the full water column of indoor fire hydrant water guns should not be less than 13m. Accordingly, the corresponding water gun flow rate is about 5.7L/s ... Look up table 5.0.4- 1, and four water guns are used at the same time, and the flow rate is 22.8 L/s. Is the design flow rate of indoor fire hydrant system 20 L/S or 22.8L/s?
Answer: According to clause 8.4. 1 of Building Code, "When indoor fire hydrant system, automatic sprinkler system, foam fire extinguishing system or fixed fire monitor fire extinguishing system are installed in the building at the same time, the indoor fire water consumption is calculated according to the sum of the water consumption of the above systems that need to be started at the same time. When the above fire extinguishing systems need to be started at the same time, the water consumption of indoor fire hydrants can be reduced by 50%, but not less than 6544. This building is equipped with indoor fire hydrant system and automatic sprinkler system. The water consumption of indoor fire hydrants can be reduced by 1 1.4 L/S, so the water consumption of indoor fire hydrants in this project is 20 L/S, which meets the requirements of water consumption specification.
20. For a factory building with a height of less than 24 m and a volume of less than 10000 m3, according to Table 8.4. 1 of the Building Code, the water consumption of fire hydrants is 5 L/S, and two water guns are used at the same time, and the minimum flow rate of each standpipe is 5 l/s. If DN65 indoor fire hydrants are adopted, the actual flow rate of each water gun is about 5 l/s.
Answer: press 10 L/S to get the value.
Water saving regulations 2 1 and 7. 1.5 can be understood as that when the indoor and outdoor fire water consumption of civil buildings is not more than 25L/S, only the roof fire water tank and pressurization equipment can be installed, but the fire pool and main fire pump cannot be installed? Does this article apply to industrial buildings (such as D&E workshops)?
Answer: Not all multi-storey civil buildings with indoor and outdoor fire water consumption not more than 25 L/S can adopt a fire water supply system with only roof fire water tank and pressurization equipment, but no fire pool and main fire pump. Buildings using this fire water supply system are generally relatively small, with only one building. The municipal tap water is sufficient but the water pressure is insufficient, so it is necessary to obtain the consent of the local fire department in advance. This article does not apply to industrial buildings.
22. Article 7. 1.5 of the Water Conservation Regulations mentions the replacement of fire water pumps with booster pumps. Is the volume of fire water tank calculated according to the water consumption 10 min?
Answer: the volume of fire water tank is calculated according to the fire water consumption 10 min.
23. Article 7.3.4 of the Water Conservation Regulations mentions that indoor fire hydrants should be installed where cooling towers are installed. Question: (1) Does the cooling tower here refer to the cooling tower installed on the roof? (2) At this time, the indoor fire hydrant box is located outdoors. If there are no walls and columns around the fire box, can I use the floor-standing fire box? (3) In an engineering design, most of the roofs are designed with solar collectors, and the cooling towers are placed on the roofs of equipment rooms such as the roof fire water tank room. At this time, the fire water tank is lower than the fire hydrant to protect the cooling tower. How to design?
Answer: (1) includes all places where cooling towers are placed. (2) If there is no wall or column around to install fire box, floor-standing fire box can be set up and anti-freezing measures can be taken. (3) Under normal circumstances, the fire water tank should be placed at the top of the roof. Under special circumstances, when the fire water tank is lower than the most unfavorable hydrant, pressurization facilities should be set on the outlet pipe of the fire water tank.
24. Paragraph 2 of Article 7.4. 1 of the Code for Water Conservation stipulates that fire hose reels should be installed in residential and commercial buildings of Class I high-rise buildings, but fire hose reels are not required in residential and commercial buildings of Class I high-rise buildings. How to grasp the developer's dissatisfaction? Other provinces and cities apply "high code", and residential and commercial buildings of a high-rise building do not need to be equipped with fire hose reels.
A: All projects in Jiangsu Province must implement the Water Conservation Regulations.
Fire hose reels should be installed in residential and commercial buildings of Class I high-rise buildings.
25, set in the garage of civil air defense engineering, when equipped with fire hydrant system, whether to set up fire hose reel?
Answer: Paragraph 6 of Article 7.6.2 of the Code for People's Fire Protection stipulates that fire hose reels should be installed at indoor fire hydrants.
However, Article 7.3. 14 stipulates: "The fire protection design of garages and garages in civil air defense projects shall be implemented according to the relevant provisions of the current national standard" Code for Fire Protection Design of Garages, Garages and Parking Lots "GB50067. Because the Steam Code does not require the provision of fire hose reels, there is no need to provide fire hose reels in the garage in civil air defense projects. However, in other places of civil air defense engineering, when a fire hydrant system is installed, a fire hose reel should be installed.
26. According to relevant codes, there is no need to set indoor fire hydrants in buildings, but fire hose reels should be set. Indoor fire hydrants are used instead of fire hose reels in the design. Does the design meet the requirements of the specification?
A: The design meets the specification requirements.
27. When the water source of the fire hose reel is connected from the domestic water supply system, what is the pressure requirement?
Answer: meet the water pressure of domestic water supply system.
28. The 18 floor apartment shown in the figure below, the entrance garden is the front room of the fire elevator, and the left and right entrance gardens each have a single riser, double valves and double outlets fire hydrant. Does it meet the specification requirements?
Answer: The fire hydrant setting in the above picture meets the specification requirements. However, it should be noted that the indoor garden is an indoor space, and no fire hydrant can be set in the indoor garden.
29. According to the "High Code" of 7.4.7.2, as long as the high-level fire water tank meets the hydrostatic pressure requirements of the most unfavorable fire hydrant, there is no need to set up pressurization facilities. How to understand the high-rise residence with the top floor of the thermocline, because the indoor fire hydrant is located on the next floor of the thermocline, it can generally meet the requirements of hydrostatic pressure.
Answer: For high-rise residential buildings with thermocline on the top floor, the thermocline should be taken as the most unfavorable point to calculate the hydrostatic pressure of fire hydrants.
30. The "High Code" requires that when the hydrostatic pressure of fire hydrant exceeds 1.0MPa, vertical zoning should be carried out.