Ventilation pipe construction Specification for manufacture, installation and acceptance of accessories

Now? Ventilation duct Its application is quite common and can be applied in a wide range of environments. How should the ventilation ducts be arranged? The exhaust points of the dedusting system should not be too many, to facilitate the resistance balance between the branches

The dedusting air duct shall be laid vertically or obliquely as far as possible, and the included angle with the horizontal plane shall be greater than 45 degrees when laid obliquely. If it is necessary to lay horizontally or the inclination is less than 30 degrees, measures should be taken, such as increasing the flow rate.

The air duct of the ventilation system should be round or rectangular, and try to be neat and beautiful on the premise of ensuring practicality.

For the exhaust system containing highly toxic substances, the length of positive pressure pipe section shall be minimized, and the positive pressure pipe section shall not pass through other rooms.

1. The pipes and fittings from a closed valve to the project mouth shall be welded with 2~3mm thick steel plates. The welds shall be full, uniform and tight.

2. The ventilation pipe in the contaminated area shall be connected by welding. The ventilation pipe construction and closed valve shall be connected by flange with sealing groove, and the contact shall be smooth; The flange gasket shall be a whole ring of rubber sealing ring without interface.

3. The thickness of steel plates for ventilation pipes and accessories in the main works shall meet the design requirements. When the design has no specific requirements. The thickness of steel plate shall be greater than 0.75mm.

4、 Ventilation engineering One end of the construction piezometric pipe outside the protective airtight door shall be provided with a downward elbow; The other end should be located in the ventilator room or control room, and ball valves should be installed. The interface of the pressure measuring pipe passing through the anti-virus channel shall be welded.

5. The measuring hole and purging sampling pipe of the vent pipe shall be made at the same time as the pipe. The measuring hole and decontamination sampling pipe shall be blocked.

6. The air flow direction, valve opening and closing direction and opening degree in the vent pipe shall be clearly and accurately marked.

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