Purification Technology Edition: Daily Question [2017-10-22]
Thread Content
How should system maintenance be carried out in terms of procedures? Answer: After the system is shut down due to lack of pressure, the addition of ammonia to the system is stopped, and the solution continues to circulate in order to warm up, at a rate of about 3°C per hour. At the same time, the residual hydrogen sulfide and carbon dioxide in the solution are desorbed. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, and then cleaned through water circulation and displacement. After passing the analysis, hand it over for maintenance. If it is only a inspection task, maintain pressure with nitrogen, open one manhole, and use a long tube to enter in order to prevent air circulation from opening multiple manholes, which could cause corrosion of the equipment.
The process steps generally include cutting off the material, releasing pressure, draining liquid, purging, and installing blind flanges; details vary depending on the specific process!
After the system is shut down due to gas cutoff, the addition of ammonia to the system is stopped, and the solution continues to circulate and warm up at a rate of about 3°C per hour, simultaneously releasing the residual hydrogen sulfide and carbon dioxide from the solution. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, water is circulated for displacement cleaning. After the analysis is approved, hand it over for maintenance. If it is only a inspection task, maintain pressure with nitrogen, open one manhole, and use a long tube to enter in order to prevent air circulation from occurring when multiple manholes are opened, which could cause corrosion of the equipment.
After the system is shut down due to gas cutoff, the addition of ammonia to the system is stopped, and the solution continues to circulate and warm up at a rate of about 3°C per hour, simultaneously releasing the residual hydrogen sulfide and carbon dioxide from the solution. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, water is circulated for displacement cleaning. After the analysis is approved, hand it over for maintenance. If it is only a inspection task, maintain pressure with nitrogen, open one manhole, and use a long tube to enter in order to prevent air circulation from occurring when multiple manholes are opened, which could cause corrosion of the equipment.
After the system is shut down due to gas release, the addition of ammonia to the system is stopped, and the solution continues to circulate and warm up at a rate of about 3°C per hour; simultaneously, hydrogen sulfide and carbon dioxide remaining in the solution are desorbed. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, water is circulated for displacement cleaning. After the analysis is approved, hand it over for maintenance. If it is only a inspection task, maintain pressure with nitrogen, open one manhole, and use a long tube to enter in order to prevent air circulation from occurring when multiple manholes are opened, which could cause corrosion of the equipment.
Nitrogen displacement system, using effective measures such as blind flanges and water seals to isolate the area under maintenance.
Complete replacement; isolation by the blind plate
After the system is shut down due to gas cutoff, the addition of ammonia to the system is stopped, and the solution continues to circulate in order to warm up, at a rate of about 3°C per hour; simultaneously, the residual hydrogen sulfide and carbon dioxide in the solution are desorbed. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, and then cleaned through water circulation and displacement.
The process treatment generally involves cutting off the material, releasing pressure, draining liquid, purging with nitrogen, cleaning with steam (venting), and installing blind flanges.
How should system maintenance be carried out in terms of procedures? Answer: After the system is shut down due to lack of pressure, the addition of ammonia to the system is stopped, and the solution continues to circulate and warm up at a rate of about 3°C per hour; simultaneously, the residual hydrogen sulfide and carbon dioxide in the solution are desorbed. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, water is circulated for displacement cleaning. After the analysis is approved, hand it over for maintenance. If it is only a inspection task, maintain pressure with nitrogen, open one manhole, and use a long tube to enter in order to prevent air circulation from occurring when multiple manholes are opened, which could cause corrosion of the equipment.
After the system is shut down due to gas release, the addition of ammonia to the system is stopped, and the solution continues to circulate and warm up at a rate of about 3°C per hour; simultaneously, hydrogen sulfide and carbon dioxide remaining in the solution are desorbed. After returning the temperature to room temperature, all the solution in the system is drained into an underground tank and stored in a solution storage tank. The system is pressurized with nitrogen, water is circulated for displacement cleaning. After the analysis is approved, hand it over for maintenance. If it is only a inspection task, maintain pressure with nitrogen, open one manhole, and use a long tube to enter in order to prevent air circulation from occurring when multiple manholes are opened, which could cause corrosion of the equipment.