Summary of 29 requirements for smoke control, ventilation and air conditioning duct settings
DATE:2024-09-06 10:21:53
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There is a fire-resistant limit requirements of the body of the duct, the framework and fixed materials, sealing gaskets and other non-combustible materials, material varieties, specifications, thickness and fire-resistant limit should be in line with the design requirements and the provisions of the current national standards.
Duct reinforcement should comply with the following provisions: 1) duct can be used inside or outside the pipe reinforcement, pipe wall compression reinforcement and other forms of reinforcement, rectangular duct reinforcement should be used angle, lightweight steel profiles or steel folding; round duct reinforcement should be used angle. 2) rectangular duct side length is greater than 630mm, or rectangular insulated duct side length is greater than 800mm, the length of the pipe segment is greater than 1250mm; or low pressure Duct unilateral plane area greater than 1.2 square meters, medium and high pressure duct greater than 1.0 square meters, should be reinforced measures. 3) straight bite seam round duct diameter greater than or equal to 800mm, and the length of the pipe section is greater than 1250mm or the total surface area of more than 4 square meters, should be taken to take reinforced measures. Spiral duct for high-pressure systems, diameter greater than 2000mm should be taken to strengthen measures. 4) medium and high-pressure duct section length greater than 1250mm, should be reinforced in the form of reinforcing frame reinforcement. High-pressure duct single bite seam, should also be taken to prevent the bite seam expansion of the reinforcement or reinforcing measures. 4, high and medium pressure system of splicing seams, take over the joints need to be sealed with sealant or sealant tape to prevent leakage. Smoke prevention and exhaust system ducts should be sealed mainly by plate connection, which can be supplemented by sealant embedded seams or other methods of sealing, the sealing surface should be located on the positive pressure side of the duct.
For high and medium pressure systems, the splicing seams and receiver connections should be sealed with sealant or sealant tape to prevent leakage. The ducts of smoke prevention and exhaust system should be mainly sealed by plate connection, which can be supplemented by sealant embedded seam or other methods of sealing, and the sealing surface should be located on the positive pressure side of the duct.
Air conditioning and ventilation ducts shall be connected by angle steel flanges, and the flanges shall be gasketed with 4.0mm-thick 8510 sealing tape, and the smoke exhaust ducts or exhaust ducts shall be gasketed with 4.0mm-thick asbestos rubber gaskets. Smoke exhaust duct and positive pressure air supply duct must be connected by angle steel flange.
When the duct is connected by flange, the flange material specification shall be selected according to the requirements of “Technical Standard for Building Smoke and Smoke Exhaust System” (GB51251-2017), and the spacing of its bolt holes shall not be greater than 150mm, and there shall be screw holes at the four corners of the flange of the rectangle duct; the plate shall be connected by nibble joint or riveted, and in addition to the galvanized steel sheet and the steel sheet containing composite protective layer, the thickness of plate＞1.5mm can be welded; the connection of the duct interface shall be connected by welding; the connection of the duct interface shall be made by 4.0mm thick asbestos gasket. Welding; duct interface connection should be tight, firm, gasket thickness should not be <3mm, gaskets should not be convex into the pipe and flange outside. Duct flange should avoid the position of beams and walls.
The air duct support bracket with reference to the 19K112 construction, you can play expansion bolts on the floor, the heavier accessories (fire damper, muffler) need to set up a separate lifting point, the support bracket to avoid the air outlet, valves, flanges and check the door.
All air supply and return outlets are made of aluminum alloy except for the description.
When the height of the air duct is <200mm, a single call adjustment room is available, and >200mm, a multi-leaf adjustment room is used.
Rectangular duct should generally be used by the rate of radius for a plane side length inside and outside the concentric regent-shaped bends, when other forms of bends, and plane length is greater than 500mm, should be set up to bend the deflector sheet.
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Duct reinforcement should comply with the following provisions: 1) duct can be used inside or outside the pipe reinforcement, pipe wall compression reinforcement and other forms of reinforcement, rectangular duct reinforcement should be used angle, lightweight steel profiles or steel folding; round duct reinforcement should be used angle. 2) rectangular duct side length is greater than 630mm, or rectangular insulated duct side length is greater than 800mm, the length of the pipe segment is greater than 1250mm; or low pressure Duct unilateral plane area greater than 1.2 square meters, medium and high pressure duct greater than 1.0 square meters, should be reinforced measures. 3) straight bite seam round duct diameter greater than or equal to 800mm, and the length of the pipe section is greater than 1250mm or the total surface area of more than 4 square meters, should be taken to take reinforced measures. Spiral duct for high-pressure systems, diameter greater than 2000mm should be taken to strengthen measures. 4) medium and high-pressure duct section length greater than 1250mm, should be reinforced in the form of reinforcing frame reinforcement. High-pressure duct single bite seam, should also be taken to prevent the bite seam expansion of the reinforcement or reinforcing measures. 4, high and medium pressure system of splicing seams, take over the joints need to be sealed with sealant or sealant tape to prevent leakage. Smoke prevention and exhaust system ducts should be sealed mainly by plate connection, which can be supplemented by sealant embedded seams or other methods of sealing, the sealing surface should be located on the positive pressure side of the duct.
For high and medium pressure systems, the splicing seams and receiver connections should be sealed with sealant or sealant tape to prevent leakage. The ducts of smoke prevention and exhaust system should be mainly sealed by plate connection, which can be supplemented by sealant embedded seam or other methods of sealing, and the sealing surface should be located on the positive pressure side of the duct.
Air conditioning and ventilation ducts shall be connected by angle steel flanges, and the flanges shall be gasketed with 4.0mm-thick 8510 sealing tape, and the smoke exhaust ducts or exhaust ducts shall be gasketed with 4.0mm-thick asbestos rubber gaskets. Smoke exhaust duct and positive pressure air supply duct must be connected by angle steel flange.
When the duct is connected by flange, the flange material specification shall be selected according to the requirements of “Technical Standard for Building Smoke and Smoke Exhaust System” (GB51251-2017), and the spacing of its bolt holes shall not be greater than 150mm, and there shall be screw holes at the four corners of the flange of the rectangle duct; the plate shall be connected by nibble joint or riveted, and in addition to the galvanized steel sheet and the steel sheet containing composite protective layer, the thickness of plate＞1.5mm can be welded; the connection of the duct interface shall be connected by welding; the connection of the duct interface shall be made by 4.0mm thick asbestos gasket. Welding; duct interface connection should be tight, firm, gasket thickness should not be <3mm, gaskets should not be convex into the pipe and flange outside. Duct flange should avoid the position of beams and walls.
The air duct support bracket with reference to the 19K112 construction, you can play expansion bolts on the floor, the heavier accessories (fire damper, muffler) need to set up a separate lifting point, the support bracket to avoid the air outlet, valves, flanges and check the door.
All air supply and return outlets are made of aluminum alloy except for the description.
When the height of the air duct is <200mm, a single call adjustment room is available, and >200mm, a multi-leaf adjustment room is used.
Rectangular duct should generally be used by the rate of radius for a plane side length inside and outside the concentric regent-shaped bends, when other forms of bends, and plane length is greater than 500mm, should be set up to bend the deflector sheet.