[Q&A Question 064] 2017.03.05
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This post was last edited by 955559 on 2017-7-21 22:23. [Q&A Question No. 064] March 5, 2017: What are the preparatory tasks before tower maintenance? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) 1. After stopping the steam supply, relieve the pressure inside the tower and use nitrogen to purge all residual oil from it. 2. Install blind plates on the equipment and pipelines connected to the tower. 3. Open the vent blind at the top of the tower to allow steam to escape. 4. Steam dehydration. 5. Slowly introduce steam into the tower without causing overpressure; steam should be visible at the top of the tower. 6. Steaming tower. 7. After the steaming tower operation is complete, drain all the condensed water from within the tower; after cooling down, open the manholes in the tower from top to bottom. 8. Before maintenance, proper safety measures against fire, explosion, and poisoning must be taken. 9. The analysis and testing gases inside the tower must meet safety requirements. 2017 Q&A Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657793-1-1.html 2017 Daily Question Summary Thread (updates have begun) http://bbs.hcbbs.com/thread-1657794-1-1.html 2016 Q&A Summary Thread (updates completed) http://bbs.hcbbs.com/thread-1597792-1-1.html Third Phase of HaiChuan’s Outstanding Management Members Selection Contest http://bbs.hcbbs.com/thread-1655902-1-1.html (Source: HaiChuan Chemical Forum)
1. Material return 2. Purging, displacement, distillation tower 3. Remove manholes and ventilate after removal
1. After shutting off the steam, relieve the pressure inside the tower and use nitrogen to purge all oil remaining in it. 2. Install blind plates on the equipment and pipelines connected to the tower. 3. Open the vent blind at the top of the tower to allow steam to escape. 4. Steam dehydration. 5. Slowly introduce steam into the tower without causing overpressure; steam should be visible at the top of the tower. 6. Steaming tower. 7. After the steaming tower operation is complete, drain all the condensed water from within the tower; after cooling down, open the manholes in the tower from top to bottom. 8. Before maintenance, proper safety measures against fire, explosion, and poisoning must be taken. 9. The analysis and testing gases inside the tower must meet safety requirements.
1. Shut off the inlet and outlet valves of the tower, then relieve the pressure. 2. Empty the material from the tower. 3. Install blind flanges on the tower to isolate it from the system. 4. Purge the tower with an inert gas. 5. Open the upper and lower manholes for exhaust ventilation. 6. In this way, it can be handed over for maintenance.
1. After shutting off the steam, relieve the pressure inside the tower and use nitrogen to purge all oil remaining in it. 2. Install blind plates on the equipment and pipelines connected to the tower. 3. Open the vent blind at the top of the tower to allow steam to escape. 4. Steam dehydration. 5. Slowly introduce steam into the tower without causing overpressure; steam should be visible at the top of the tower. 6. Steaming tower. 7. After the steaming tower operation is complete, drain all the condensed water from within the tower; after cooling down, open the manholes in the tower from top to bottom. 8. Before maintenance, proper safety measures against fire, explosion, and poisoning must be taken. 9. The analysis and testing gases inside the tower must meet safety requirements.
(A) Prepare a maintenance plan (B) The interior of the tower must be purged, displaced, and cleaned (C) Isolate all connections using blind flanges **:
1. Prepare a maintenance plan； 2. The interior of the tower must be purged, displaced, and cleaned ； 3. Isolate each connection blind flange.
After the material is removed, purge the system and ensure effective isolation. Once the distillation tower is completed, drain all water from the bottom of the tower, open manholes for ventilation, measure the gas composition, and prepare for maintenance work inside the tower
The main tasks include: 1. Emptying the material inside the tower； 2. Cleaning, 3. Displacement, 4. Adding blind flanges, 5. Steaming, 6. Ventilation and cooling, 7. Obtaining permission to load into the tank
1. Drain all the material. 2. Water intermodal transport. 3. Steam the tower. 4. Open the manhole to allow air in. 5. Keep the oxygen content inside the tower between 19% and 21%. When working inside the 6-meter tower, there must be someone to supervise from outside. 7. Use a 12-volt power supply to light it up.
Steam towers, purging, ventilation; install blind flanges, ensure proper sampling; wear appropriate protective equipment