Shenyang ventilation pipeline Specification for fabrication, construction, installation and acceptance of accessories
Ventilation pipe construction Fabrication and installation of accessories
1、 Ventilation engineering The pipes and fittings constructed from the first closed valve D to the project mouth shall be welded with steel plates 2~3mm thick. The welds shall be full, uniform and tight.
2、 Ventilation duct The ventilation pipes in the contaminated area under construction shall be connected by welding. The ventilation pipe and the 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. One end of the engineering 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.
Installation of water supply and drainage pipes, oil supply pipes and accessories
1. The pressure drainage pipe should be water supply cast iron pipe, galvanized pipe, galvanized steel pipe or UPVC plastic pipe, and its interface should be filled with oil hemp or plastered with asbestos cement instead of cement mortar.
2. The filler for oil pipe screw connection shall be a mixture of glycerin and red lead powder, and lead oil hemp wire shall not be used. The base plate for oil pipe flange connection shall be asbestos cardboard coated with graphite on both sides, and ordinary rubber gasket shall not be used.
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