The fabrication of ventilation pipes and accessories and the pipes and accessories from the closed valve to the mouth of the project shall be welded with 2 ~ 3mm thick steel plate. The welds shall be full, uniform and tight, and the ventilation pipes in the contaminated area shall be welded. The flange with sealing groove shall be selected for the connection between the ventilation pipe and the closed valve, and its contact shall be flat.

法兰垫圈应选用整圈无接口橡胶密封圈，主体工程内通风管与配件的钢板厚度应符合设计要求。当设计无具体要求时。钢板厚度应大于0.75mm.工程测压管在防护密闭门外的一端应设有向下的弯头；另一端宜设在通风机房或操控室，并应装置球阀。

The flange gasket shall be a whole ring of rubber sealing ring without interface, and the steel plate thickness of ventilation pipe and accessories in the main project shall meet the design requirements. When there are no specific requirements in the design. The thickness of the steel plate shall be greater than 0.75mm. A downward elbow shall be set at one end of the engineering pressure measuring pipe outside the protective airtight door; The other end should be set in the ventilator room or control room, and a ball valve should be installed.

济南通风管道

Jinan ventilation duct

通过防毒通道的测压管，其接口应选用焊接，通风管的测定孔、洗消取样管应与管一起制作。测定孔和洗消取样管应封堵，通风管内气流方向、阀门启闭方向及敞开度，应标明明晰。

The joint of the pressure measuring pipe passing through the anti-virus channel shall be welded, and the measuring hole of the ventilation pipe and the decontamination sampling pipe shall be made together with the pipe. The measuring hole and decontamination sampling pipe shall be blocked, and the air flow direction, valve opening and closing direction and opening degree in the ventilation pipe shall be clearly marked.

给水排水管道、供油管道与附件的装置，压力排水管宜选用给水铸铁管、镀锌管、镀锌钢管或UPVC塑料管，其接口应选用油麻填充或石棉水泥抹口，不得选用水泥砂浆抹口，油管丝扣衔接的填料，应选用甘油和红丹粉的调和物，不得选用铅油麻丝。油管法兰衔接的垫板，应选用两面涂石墨的石棉纸板，不得选用一般橡胶垫圈。

For the devices of water supply and drainage pipes, oil supply pipes and accessories, and pressure drainage pipes, water supply cast iron pipes, galvanized pipes, galvanized steel pipes or UPVC Plastic pipes should be selected. The joints should be filled with oil hemp or plastered with asbestos cement, and cement mortar should not be used. The filler connected with oil pipe threads should be mixed with glycerol and red lead powder, and lead oil hemp wire should not be used. Asbestos paperboard coated with graphite on both sides shall be selected as the backing plate for the connection of oil pipe flange, and general rubber gasket shall not be selected.