Manually operated sampling port on the chimney

GB/T 16157-1996 \"Specifications for sampling methods of particulate matter and gaseous pollutants in exhaust gases from fixed pollution sources\" is a Chinese standard that specifies the methods and equipment required for sampling exhaust gases from fixed pollution sources. If it is necessary to add an artificial sampling port above the sampling port of an existing Continuous Emission Monitoring System (CEMS), this usually needs to be determined based on specific sampling requirements and the design of the flue. Regarding your question: 1. Connection size: If the “DN100” you mentioned refers to an opening with a diameter of 100 millimeters, this is a common nominal diameter used to indicate the size of pipe or equipment connections. “Opening it to 50” may refer to the need to make the pipe connection have a diameter of 50 millimeters. Generally, when designing a sampling port, the diameter of the conduit is determined based on the specific requirements of the sampling equipment and the sampling method. You should determine the size of the take over based on actual needs and the specific requirements in the standards. 2. Sealing method: Sealing the sampling port is usually done for safety and to prevent the leakage of pollutants during periods when sampling is not taking place. The method of sealing can be a flanged blind plate, a sealing cover, or other suitable sealing devices. When selecting a sealing method, factors such as reliability, corrosion resistance, ease of operation, and safety must be taken into consideration. For example, when sampling is not carried out, a flanged blind plate with a sealing ring can be fastened at the sampling port to ensure a tight seal. In accordance with the GB/T 16157-1996 standard, the sampling points should be located in such a way as to reflect the actual conditions of the flue gas, while also facilitating sampling by the operators. When adding artificial sampling ports, relevant environmental protection regulations and safety rules must be complied with; it may also be necessary to seek advice from professionals or regulatory authorities, and the design and construction should be carried out based on the actual circumstances. If you need specific construction plans and technical details, it is recommended to contact professional environmental engineering companies or consult relevant technical experts. .