Specification for production and installation acceptance of ventilation ducts and accessories

1. The pipes and fittings from the first closed valve to the project mouth should be welded with steel plates with a thickness of 2 to 3 mm. The weld seam should be full, uniform and tight.

2. The ventilation pipes in the poisoned area should be connected by welding. Ventilation pipes and closed valves should be connected by flanges with sealing grooves, and their contact should be smooth; flange gaskets should be full-circle non-interface rubber sealing rings.

3. The steel plate thickness of the ventilation pipes and fittings in the main project should meet the design requirements. When the design has no specific requirements. The thickness of the steel plate should be greater than 0.75mm.

4. One end of the engineering pressure measuring pipe outside the protective closed door should be provided with a downward elbow; the other end should be located in the ventilation room or control room, and a ball valve should be installed. The interface of the pressure measuring tube passing through the anti-virus channel shall be welded.

5. The measuring hole of the ventilation pipe and the decontamination sampling pipe should be made at the same time as the pipe. The measuring hole and decontamination sampling tube should be blocked.

6. The direction of air flow, valve opening and closing direction and opening degree in the ventilation pipe should be clearly and accurately marked.