How did you protect the catalysts in the medium and low voltage transformers during the major repair?
Thread Content
How did you protect the catalysts in the medium and low voltage transformers during the major repair?
We operate on a medium-to-low level of process complexity; generally, no hole drilling is done to inspect the catalyst. For medium-pressure units, water is removed and steam is cut off while maintaining heat and pressure, while for low-pressure units, the unit is disconnected from the system to release pressure, after which nitrogen is used to maintain a slight positive pressure； If drilling is required, cool it cyclically back to room temperature and normal pressure. Generally, it is sufficient to follow the plan outlined by the \"Technical Security Department\".
Please be more careful on the 2nd and 3rd floors; there are many similar statements in the book
Protected by a slight positive nitrogen pressure, with regular drainage; a dedicated person is responsible for catalyst protection, and the bed temperature is recorded every half hour
1. Before stopping the operation, increase the pressure first; there is no need for pressure exchange – let the pressure and temperature drop naturally. If the pressure falls below 0.05 MPa (and if a maintenance task on the pressure swing adsorption unit is not urgent, then do not reduce the pressure of that unit yet); use decarburized gas to maintain the pressure.
2. If maintenance is required on the pressure swing adsorption unit’s decarburization system, prepare some nitrogen cylinders and use 99.99% pure nitrogen to maintain a slight positive pressure at the instrument valves.
3. If necessary, install blind flanges before the inlet valve and after the outlet valve of the converter.
4. Prepare a backup power supply for the instruments (in case maintenance is needed on the power distribution system), and assign someone to monitor and record the furnace temperature and pressure. Please refer to this post: http://bbs.hcbbs.com/viewthread.php?tid=384260&highlight=
2. If maintenance is required on the pressure swing adsorption unit’s decarburization system, prepare some nitrogen cylinders and use 99.99% pure nitrogen to maintain a slight positive pressure at the instrument valves.
3. If necessary, install blind flanges before the inlet valve and after the outlet valve of the converter.
4. Prepare a backup power supply for the instruments (in case maintenance is needed on the power distribution system), and assign someone to monitor and record the furnace temperature and pressure. Please refer to this post: http://bbs.hcbbs.com/viewthread.php?tid=384260&highlight=
Thank you for your teachings! Due to differences in levels and plant operating conditions, please bear with us and keep pushing us on!