What are the purging and air-tightening principles of sewage stripping equipment?

This post was last edited by Shandong Huaxing on 2010-6-29 22:09 1. When purging process gas pipelines, sufficient gas volume should be ensured so that the purge gas flow rate is greater than the flow rate of normal operation, or the minimum is not less than 20m/s. 2. The air purging pressure of process pipelines is generally required to be between 0.6 and 0.8MPa. Low-pressure pipelines can be purged with 0.15 to 0.20MPa air depending on the situation. 3. Appropriate protection measures should be taken for the regulating valve and try to bypass the regulating valve. Otherwise, the valve must be purged before passing the valve. If necessary, remove the regulating valve and add a temporary short pipe connection. 4. Before purging, a baffle must be installed in front of the inlet of heat exchangers, towers and other equipment. The equipment can only be entered after the inlet pipe has been purged. 5. In principle, the regulating valve on the system cannot be used as the purge control valve during purging. It is best to use a cut-off valve or a temporary valve. 6. When purging, the connection between the safety valve and the pipeline should be disconnected, and a blind plate or baffle should be added to prevent debris from damaging the sealing surface of the safety valve. 7. After the main pipeline is purged, all instrument pressure lines and analysis sampling points on the pipeline should be opened for purging. 8. All venting torch pipelines and diversion pipelines should be purged after the main pipeline connected to them has passed the purge. The diversion and valves on the equipment shell must be purged. 9. During the purging process, the downstream system can only be entered after the upstream system is qualified. 10. All towers, tanks, tanks and other containers, after passing the purge, should be manually cleaned again, internal parts should be reset, and relevant procedures should be followed when closing.

This post was last edited by Shandong Huaxing on 2010-6-29 22:09 1. All regulating valves in the system have been reset, the flow orifice plate has been installed, and conditions are met for driving. 2. The temperature measurement, pressure measurement and liquid level gauges of the instruments have been installed. 3. All analysis points and sampling points have been installed, and the root valve is closed. 4. The system's regulating valve can operate, which means it has working conditions. 5. The on-site pressure gauge has been installed, and the test pressure gauge has been calibrated, and during the period of weekly inspection, its precision shall not be lower than level 1.5. 6. Confirm valves and blind plates as required. 7. Divide into several levels and test from low to high. Use soapy water to check the connections of equipment and pipelines, flanges, valves, welds, manholes, etc. If leaks are found, mark them with chalk in time. After the pressure is released, notify the maintenance personnel to deal with it. After the inspection is completed, pressurize again. After passing the inspection, do the air tightness test of the next level. Finally, if the test reaches 1.05 times the operating pressure and the pressure is maintained for 24 hours, the leakage rate is less than 5%, which is considered qualified.