1. 1 air duct material: metal (galvanized steel plate, stainless steel ...)

Non-metal (hard PVC, FRP, glass magnesium ...)

Composite materials (non-combustible surface composite insulation board: phenolic resin, aluminum foil centrifugal cotton …), building air duct.

1.2 exhaust pipe: the body, frame, fixing materials and gasket materials must be incombustible.

The thickness of the steel plate air duct is selected according to the high pressure system, and the inspection and test are carried out according to the medium pressure system.

1.3 composite material: the covering material must be incombustible, and the internal thermal insulation material should be incombustible or flame retardant B 1, which is harmless to human body.

1.4 type of piping system:

Low pressure: p ≤ 500 pa;

Medium pressure: 500 pa < p ≤1500 pa;

High voltage: p > P> 1500Pa.

Dust removal system: (steel pipe thickness selection)

1.5 composite material: the covering material must be incombustible, and the internal thermal insulation material should be incombustible or flame retardant B 1, which is harmless to human body.

Pipe assembly:

2. 1 The flexible short pipe of smoke control and extraction system must be made of incombustible materials.

2.2 The flexible short pipe should be made of a flexible material that is corrosion-resistant, moisture-proof, airtight and not easy to be moldy, and dew prevention measures should be taken when it is used in the air conditioning system.

2.3 In general, the length of flexible short pipe should be 150~300mm.

2.4 Flexible short pipe should not be used as reducing connecting pipe for alignment and leveling.

2.5 The length of the flexible short pipe located at the deformation joint of the structure shall be the width of the deformation joint plus 100mm or more.

2.6 When the tuyere is connected, the external decorative surface should be smooth, the distribution of blades or diffusion rings should be uniform, the color should be consistent, and there should be no obvious scratches and indentations.

Installation of air duct system:

3. 1 When the air duct passes through the fire-proof and explosion-proof wall or floor to be closed, the pipeline or protective sleeve shall be embedded, and the thickness of the steel plate shall not be less than 1.6 mm ... The space between the air duct and the protective sleeve shall be blocked with flexible materials that are non-combustible and harmless to human body.

3.2 Duct supports: the spacing between supports and hangers should be less than or equal to 400mm, not more than 4m, not more than 400mm and not more than 3 m; The distance between supports and hangers of thin steel flange air duct should not be greater than 3m.

3.3 Anti-sway support for air duct: When the length of main pipe and trunk pipe is less than 20m, anti-sway fixed points shall be set, and each system shall be no less than 1.

3.4 When the diameter or long side of the fire damper is greater than 630mm, independent supports and hangers shall be set up.

3.5 The air duct should be connected with the hexagon nut with flange on the same side (in the same direction). The flange gasket should meet the functional requirements of the system, and the thickness should not be less than 3 mm. The gasket should not extend into the air duct or out of the flange.

3.6 The length of flexible metal or nonmetal air duct shall not exceed 2m, and there shall be no dead bending or collapse.

Ventilation and air conditioning equipment installation:

4. 1 landing equipment anchor screw; Anticorrosion of screws.

4.2 Shock absorption of fans (smoke and exhaust)

4.3 The exposed part of the fan transmission device and the inlet and outlet to the atmosphere must be equipped with a protective cover (net) or other safety facilities should be taken.

Installation of pipes and equipment of air conditioning water system;

5. 1 Installation of supports and hangers for grooved connecting pipe P65 (spacing and principle).

5.2 Maximum spacing of steel pipe supports and hangers P66

5.3 Gas test and pressure test: (time and pressure) valve strength and leak test; Fan coil unit; Piping system (zoning, layering; System)

5.4 Pressure gauge assembly

5.5 The connection between pipes and water pumps and chillers must be flexible, and flexible short pipes shall not be forcibly connected. The pipes connected with them shall have independent supports.

5.6 Pipe steel sleeve shall be flush with the decorative surface of the wall, and the sleeve passing through the floor shall be 20~50mm higher than the decorative surface.

5.7 Shock absorption and displacement prevention of equipment.

Anti-corrosion and thermal insulation:

6. 1 The insulation engineering construction of air duct and air conditioning equipment shall be carried out after the air tightness inspection of the system.

6.2 Air conditioning pipeline insulation engineering construction should be carried out after system strength and leak test and anti-corrosion treatment.

6.3 Anti-corrosion treatment of supports and hangers shall be consistent with air ducts or pipes, and exposed parts shall be painted with topcoat.

6.4 Thermal insulation material: nonflammable or nonflammable, and its material, density, specification and thickness shall meet the design requirements.

6.5 incombustible materials must be used in the following occasions:

800mm air duct and insulation layer before and after electric heater;

Pass through the air ducts, pipes and insulation layers within 2m on both sides of the fire partition.

6.6 Construction with adhesive fixation method.

6.7 Construction requirements for fixing insulating nails.

6.8 Structure of metal protective shell.

I believe that after the above introduction, everyone has a certain understanding of the acceptance standards and key points of ventilation engineering construction quality. Welcome to Zhong Da for more information.

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