Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tham khảo tài liệu 'hvac and dehumidifying systems_2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split UnregisteredVersion- http www.simpopdf.com b It is too dangerous to allow untrained personnel to don SCBA equipment and venture into a known hazardous atmosphere. For that reason the Navy has elected not to provide the SCBA since there would be no control over who might don the SCBA and attempt to enter the room. 2.6 Radon Mitigation Systems. The following components of a sub-slab depressurization system should be included in the design for buildings which will be constructed on sites known or suspected of being a source of radon gas and which will be occupied more than 4 hours a day a Piping. Provide one 3-inch diameter polyvinyl chloride PVC pipe Schedule 20 through the floor slab for every 1 000 square feet of slab area located as close to the center of the area as possible. See Figure 1 for floor penetration detail. Pipe should extend through the building roof concealed in partitions closets store rooms etc. An adequate length of straight vertical piping should be provided in the ceiling space below the roof for future installation of the depressurization fan if post construction testing indicates excessive radon levels. Locating the fan near the roof or ceiling establishes a negative pressure in the piping system thereby minimizing potential of leaks in occupied spaces. Crack between pipe and slab should be sealed with polyurethane caulk. Evaluate the economic feasibility of combining several PVC pipes to reduce the number of risers and the number of roof penetrations especially for multi-story buildings. b Electrical Requirements. Provide a 110 volt 15 ampere electrical power supply terminating at convenient locations near the location for the future depressurization fans in PVC pipe. Ensure convenient access to locations selected for future installation of depressurization fans. 21 MIL-HDBK-1003 3 Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com Figure 1 Floor Penetration for Sub-Slab Depressurization System .