【Q&A Question 152】2018.06.01
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【Q&A Question 152】June 1, 2018: Briefly describe what should be noted when performing the scanning operation Strengthen connections with external organizations. Strengthen the connections and coordination between systems, and line cleaning must be carried out in accordance with the established procedures and protocols. Before feeding steam, all condensate in the steam must be removed; it is not allowed to feed water-containing steam into the hot oil pipelines. Before cleaning, the inlet and outlet of the shell side or tube side of the heat exchanger that is not to be cleaned should be kept at a certain opening degree to avoid pressure buildup. For the cooler, the water should be drained, the inlet and outlet valves should be closed, and the vent should be opened. For the container, it is necessary to ensure that all oil inside has been drained before performing line cleaning; the bottom drain valve should be opened first, followed by the top vent valve. After scanning, the vent should be opened to fully drain the condensate. When cleaning the pump casing with a centrifugal pump, be sure to turn on the pump’s cooling water. At the end of the line cleaning, the relevant connection valves should be closed first, followed by shutting off the steam, to strictly prevent cross-contamination. Before shutting off the steam, an evacuation check should be carried out to ensure complete clearance before shutdown, and condensate should be drained afterward. During line cleaning, enhanced inspection of the oil tank should be carried out, with attention paid to overflow and dehydration. Based on the steam supply volume, focus on cleaning a few pipelines in sequence; after they are cleaned, proceed to clean more pipelines, without dispersing the steam supply. Make careful records. The handover must be clear. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) ) Correct: 3 wealth, Incorrect: 1 wealth ； Mass posting of posts – rated based on the lowest score ； Replies that are unrelated to the answer are considered spam and will be deleted immediately. For management purposes, if you need to view content from a few days ago, please go to https://bbs.hcbbs.com/home.php?mod=space&uid=3862647&do=thread&view=me&from=space through the summary post below. The APP short-video skill competition has begun! https://bbs.hcbbs.com/forum.php?mod=viewthread&tid=1951670
(1) Sweep the heavy oil pipeline first, then the light oil pipeline. (2) The heat exchanger should first be purged through the main line, and then through the secondary line. (3) The cooler first shuts off the water supply, and then drains the remaining water through the valve behind it; after that, steam is used to clean the lines. (4) The control valve should first purge the bypass line, and then the main line of the control valve. (5) The three-way valve should be moved back and forth during cleaning. (6) The gasoline and condensed oil systems should first be flushed with water to remove all the oil, and then purged with steam.
(1). During line cleaning, open the drain valves of each tower and container； (2). Before scanning, close the conduits of each orifice plate and the side line of the oil gauge ； (3) When using steam for line cleaning, make sure to drain all the condensate water before starting the cleaning process. In winter, after using steam for cleaning, it is necessary to use air to blow out any water that remains inside the pipes. Open the drains or flanges in low-lying areas to drain the condensate water and prevent freezing ； (4) When using air to blow through hot oil lines, the temperature of the oil in the lines and containers must be 20 degrees below the flash point of that oil to prevent explosions and fires ； (5) For pipelines with high oil viscosity, it is necessary to purge them with steam first and then with air ； (6). After the device is shut down, cleaning the wires must be carried out promptly; there should be no delays ； (7). To ensure that the pipeline is thoroughly purged, it is necessary to close the end valve, build up pressure, and then open it again; this process should be repeated 3–5 times to guarantee the quality of the purge ； (8) Keep thorough records to avoid omissions; ensure that each pipeline is assigned to a specific person responsible for it, and submit the pipeline inspection records to the workshop.
Answer: Strengthen connections with external organizations. Strengthen the connections and coordination between systems, and line cleaning must be carried out in accordance with the established procedures and protocols. Before feeding steam, all condensate in the steam must be removed; it is not allowed to feed water-containing steam into the hot oil pipelines. Before cleaning, the inlet and outlet of the shell side or tube side of the heat exchanger that is not to be cleaned should be kept at a certain opening degree to avoid pressure buildup. For the cooler, the water should be drained, the inlet and outlet valves should be closed, and the vent should be opened. For the container, it is necessary to ensure that all oil inside has been drained before performing line cleaning; the bottom drain valve should be opened first, followed by the top vent valve. After scanning, the vent should be opened to fully drain the condensate. When cleaning the pump casing with a centrifugal pump, be sure to turn on the pump’s cooling water. At the end of the line cleaning, the relevant connection valves should be closed first, followed by shutting off the steam, to strictly prevent cross-contamination. Before shutting off the steam, an evacuation check should be carried out to ensure complete clearance before shutdown, and condensate should be drained afterward. During line cleaning, enhanced inspection of the oil tank should be carried out, with attention paid to overflow and dehydration. Based on the steam supply volume, focus on cleaning a few pipelines in sequence; after they are cleaned, proceed to clean more pipelines, without dispersing the steam supply. Make careful records. The handover must be clear.
I still can’t; it’s too difficult to answer. :'(:'(
(1) When sweeping, care must be taken to avoid water hammer, pressure buildup, injury to people, and the presence of dead corners. (2) After purging is complete, drain the water remaining in the pipelines and equipment containers. (3) The system is fed with liquefied gas to prevent freezing accidents caused by the heat absorption associated with vaporization.
Strengthen connections with external organizations. Strengthen the connections and coordination between systems, and line cleaning must be carried out in accordance with the established procedures and protocols. Before feeding steam, all condensate in the steam must be removed; it is not allowed to feed water-containing steam into the hot oil pipelines. Before cleaning, the inlet and outlet of the shell side or tube side of the heat exchanger that is not to be cleaned should be kept at a certain opening degree to avoid pressure buildup. For the cooler, the water should be drained, the inlet and outlet valves should be closed, and the vent should be opened. For the container, it is necessary to ensure that all oil inside has been drained before performing line cleaning; the bottom drain valve should be opened first, followed by the top vent valve. After scanning, the vent should be opened to fully drain the condensate. When cleaning the pump casing with a centrifugal pump, be sure to turn on the pump’s cooling water. At the end of the line cleaning, the relevant connection valves should be closed first, followed by shutting off the steam, to strictly prevent cross-contamination. Before shutting off the steam, an evacuation check should be carried out to ensure complete clearance before shutdown, and condensate should be drained afterward. During line cleaning, enhanced inspection of the oil tank should be carried out, with attention paid to overflow and dehydration. Based on the steam supply volume, focus on cleaning a few pipelines in sequence; after they are cleaned, proceed to clean more pipelines, without dispersing the steam supply. Make careful records. The handover must be clear
Blowing should be carried out section by section, with proper safety measures taken; warning lines should be set up. When using steam for blowing, it is necessary to first activate the bypass line to warm the pipes, and enhance condensate drainage to prevent water hammer
1. The speed should be slow； Inflate slowly ； 2. Strengthen inspections at the unloading points along the route ； 3. Keep proper records of purging, including the steam injection points, vent points, and purging times ；
(1) Sweep the heavy oil pipeline first, then the light oil pipeline. (2) The heat exchanger should first be purged through the main line, and then through the secondary line. (3) The cooler first shuts off the water supply, and then drains the remaining water through the valve behind it; after that, steam is used to clean the lines. (4) The control valve should first purge the bypass line, and then the main line of the control valve. (5) The three-way valve should be moved back and forth during cleaning. (6) The gasoline and condensed oil systems should first be flushed with water to remove all the oil, and then purged with steam.
The following points should be noted when conducting line inspections: (1) Strengthen communication with external organizations. (2) Strengthen the connection and coordination between systems; wire cleaning must be carried out in accordance with the established procedures and protocols. (3) Before feeding steam, all condensate in the steam must be removed; steam containing water must not be introduced into the hot oil pipeline. (4) Before performing line cleaning, the inlet and outlet valves of the shell side or tube side of the heat exchanger that are not to be cleaned should be kept at a certain opening degree to avoid pressure buildup. (5) For the cooler, stop the water supply, close the inlet and outlet valves, and open the vent. (6) For the container, it is necessary to ensure that all oil inside has been drained before performing line cleaning; the bottom drain valve should be opened first, followed by the top vent valve. After scanning, the vent should be opened to fully drain the condensate. (7) When cleaning the pump body of a centrifugal pump, the cooling water for the pump must be turned on. After sweeping, open the pump body plug to drain the condensate and stop the cooling water. (8) At the end of the line cleaning, the relevant connection valves should be closed first, followed by turning off the steam, to strictly prevent cross-contamination. (9) Before shutting off the steam, an evacuation check should be conducted to ensure everything is thoroughly cleaned before shutdown, and condensate should be drained afterward. (10) Based on the steam supply volume, focus on cleaning a few pipelines in sequence; after they are cleaned, move on to the next ones, without dispersing the steam supply. (11) Proper records must be kept; those who have cleaned the pipelines during their shift should sign at the end of the pipeline cleaning process. (12) The handover must be clear.