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Datang Fuxin Coal-to-Natural Gas Gasification Center: Successful completion of airtightness tests for Series B of gasification units. Author/Source: Datang Fuxin Coal-to-Natural Gas. Date: 2020-08-27. Clicks: 16. To ensure the smooth operation of all gasification units, the Gasification Center recently carried out leak detection and pressure retention tests under test pressures for Series B of pressurized gasification units, Series B of shift cooling units, Series B of phenol recovery units, and Series CD of gas-water separation units, in accordance with the requirements of the airtightness testing plan. The airtightness test is an important task in the initial startup procedure, which is given high priority by the gasification center, which plans for it thoroughly. In the earlier stages, through thorough \"three inspections and four determinations,\" all areas that did not conform to the design drawings as well as all defects were addressed. Only after hydraulic testing, air purging, water flushing, and airtightness testing was it finally ready for use. The airtightness test checked the airtightness of the equipment and pipelines, determined their safety under normal operating pressures, eliminated shutdown incidents caused by leaks due to poor sealing, and ensured that the unit could operate for extended periods after being put into use. After the coal-lock gas compressor started successfully and began supplying gas to the gasification and shift cooling systems, as the system pressure rose to 0.5 MPa, the operators of each unit checked the sealing integrity of every flange in the units by applying soapy water, in accordance with the airtightness inspection procedures, to ensure that no \"blind spots\" were overlooked; any leaks that were detected were promptly addressed in cooperation with the maintenance staff. After the sealing check in the first phase was completed, the system pressure was increased further to 1.0 MPa, and the operators conducted another sealing check on all flange connections. This process was repeated until the system pressure reached 2.5 MPa, at which point all airtightness checks were finished. It is reported that for this airtightness test, a total of 28 gaskets were replaced in the gasification and conversion B series, and 163 leakage points were addressed ； A total of 168 leakage points were treated using the Phenol-Amine B series and the Gas-Water CD series.