[Q&A] 3/27/2017
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Question: How to put a heat exchanger into use? Answer: 1. The heat exchanger can be used only after passing the pressure test. 2. First, open the cold material inlet valve and simultaneously open the cold material outlet drain valve to release the air from within the shell (or tube side); then close the drain valve. Once the cold material has filled the system, slowly open the cold material outlet valve. 3. Slightly open the hot material inlet valve and the hot oil outlet drain valve to discharge the air trapped in the equipment; thereafter, close the drain valve and open the hot material outlet valve. Make sure to check for leaks in the floating head, the large cover, and the flanges. http://bbs.hcbbs.com/static/image/hrline/4.gif The petrochemical deep processing edition – the event to share pictures of chemical equipment has started! A vast amount of wealth, along with HaiChuan coins, is waiting for you to claim! http://bbs.hcbbs.com/thread-1760733-1-1.html Summary post for the Petrochemical Deep Processing section’s 【Question of the Day】 – updated daily by the moderator. http://bbs.hcbbs.com/thread-1496481-1-1.html Summary post of weekly topics for the Petrochemical Deep Processing section~~~ Continuously being updated! http://bbs.hcbbs.com/thread-1751483-1-1.html Petrochemical Zone—New Ideas for Energy Saving: The “Creative Thinking” Campaign http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones waiting for you to claim them. A thread on the “Petrochemical Section” for collecting various chemical technology materials http://bbs.hcbbs.com/thread-1654603-1-1.html Many prizes waiting for you to win
Open the drain valves on the tube side and shell side of the heat exchanger, drain all the liquid stored there, and then close the valves. Open the outlet valve for the cold medium. Open the inlet valve for the cold medium, while closing the bypass valve. Once the cold medium is functioning properly, slightly open the inlet valve for the hot medium to carry out preheating
1. After the steam pressure test, ensure there are no leaks; then open the water valve at the equipment’s outlet fully, and subsequently open the inlet water valve. Before activation, a thorough inspection of the heat exchanger and its accessories is carried out to ensure that they are properly installed and meet the specified requirements. 2. The heat exchanger can be put into use only after passing the pressure test; before use, all water remaining in the heat exchanger must be drained. 3. First, open the cold flow outlet valve and the drain valve; then slowly open the inlet valve to expel all air and residual liquid. After that, close the drain valve and the cold flow bypass valve, ensuring they are fully closed. Be careful to avoid pressure buildup, and monitor any changes in the equipment. Once the cold flow returns to normal, heat is introduced into the heat exchanger in the same manner. 4. After the flow rates of cold and hot fluids return to normal, issues such as dripping or leakage may occur due to changes in temperature and pressure; a thorough inspection must be carried out again. Only when no problems are found can the system be considered to be operating properly, and regular inspections should be conducted.
1. Open the drain valves for the tube side and shell side of the heat exchanger, drain all the liquid remaining, and then close them. 2 Open the outlet valve for the cold medium. 3 Open the inlet valve for the cold medium, and close the branch line valve at the same time. 4 Once the cold medium is operating properly, slightly open the inlet valve for the hot medium to carry out preheating. 5. After preheating is complete, fully open the hot medium outlet valve. 6 Slowly open the hot medium inlet valve, while closing the hot medium branch valve, until the branch valve is fully closed and the inlet valve is fully open.
Open the drain valves on the tube and shell sides of the heat exchanger, drain all the liquid remaining, and then close them. Open the outlet valve for the cold medium. Open the inlet valve for the cold medium, and close the branch line valve at the same time. Once the cold medium is operating properly, slightly open the inlet valve for the hot medium to carry out preheating. After preheating is complete, fully open the heat medium outlet valve. Gradually open the hot medium inlet valve, while closing the hot medium branch valve, until the branch valve is fully closed and the inlet valve is fully open
1. The heat exchanger can be used only after passing the pressure test. 2. First, open the cold material inlet valve and simultaneously open the cold material outlet drain valve to remove the air from the shell (or tube side); then close the drain valve. Once the cold material has filled the system, slowly open the cold material outlet valve. 3. Slightly open the hot material inlet valve and the hot oil outlet drain valve to release the air trapped in the equipment; thereafter, close the drain valve and open the hot material outlet valve. Make sure to check for leaks in the floating head, the large cover, and the flanges.
1. After the heat exchanger passes the pressure test, it can be put into use; before that, the water remaining inside the heat exchanger must be drained. 2. Check whether all drain and vent valves are flexible and functional, as well as their operating positions; ensure that all pressure gauges and thermometers are installed. 3. Check whether the foundation supports are secure and whether all bolts are properly tightened. 4. When putting it into operation, the cold flow should be introduced first followed by the hot flow; this is because introducing the hot flow first causes the various components to expand due to heat, while introducing the cold flow afterward causes them to contract sharply. Such a temperature difference will immediately lead to leaks at the static sealing points. Conversely, when shutting down the heat exchanger, the hot flow should be stopped first, followed by the cold flow. 5. When introducing a cold medium or a hot medium, it is first necessary to ensure that the bypass line is unobstructed. After slowly opening the outlet valve and confirming there are no issues, the inlet valve should also be opened slowly to prevent pressure buildup. During this process, it is important to monitor any changes in the equipment. 6. After the heat exchanger is put into use, leaks may occur due to changes in temperature and pressure, so it should be inspected promptly.
Steps for putting the heat exchanger into operation: 1. The heat exchanger can be put into use only after it has passed the pressure test; before use, the water remaining inside the heat exchanger must be drained. 2. Check whether all drain and vent valves are flexible and functional, as well as their operating positions; ensure that all pressure gauges and thermometers are installed. 3. Check whether the foundation supports are secure and whether all bolts are properly tightened. 4. When putting it into operation, the cold flow should be introduced first followed by the hot flow; this is because introducing the hot flow first causes the various components to expand due to heat, while introducing the cold flow afterward causes them to contract sharply. Such a temperature difference will immediately lead to leaks at the static sealing points. Conversely, when shutting down the heat exchanger, the hot flow should be stopped first, followed by the cold flow. 5. When introducing a cold medium or a hot medium, it is first necessary to ensure that the bypass line is unobstructed. After slowly opening the outlet valve and confirming there are no issues, the inlet valve should also be opened slowly to prevent pressure buildup. During this process, it is important to monitor any changes in the equipment. 6. After the heat exchanger is put into use, leaks may occur due to changes in temperature and pressure; inspections should be carried out promptly
1. After the heat exchanger passes the pressure test, it can be put into use; before that, the water remaining inside the heat exchanger must be drained. 2. Check whether all drain and vent valves are flexible and functional, as well as their operating positions; ensure that all pressure gauges and thermometers are installed. 3. Check whether the foundation supports are secure and whether all bolts are properly tightened. 4. When putting it into operation, the cold flow should be introduced first followed by the hot flow; this is because introducing the hot flow first causes the various components to expand due to heat, while introducing the cold flow afterward causes them to contract sharply. Such a temperature difference will immediately lead to leaks at the static sealing points. Conversely, when shutting down the heat exchanger, the hot flow should be stopped first, followed by the cold flow. 5. When introducing a cold medium or a hot medium, it is first necessary to ensure that the bypass line is unobstructed. After slowly opening the outlet valve and confirming there are no issues, the inlet valve should also be opened slowly to prevent pressure buildup. During this process, it is important to monitor any changes in the equipment. 6. After the heat exchanger is put into use, leaks may occur due to changes in temperature and pressure, so it should be inspected promptly.
First, introduce the cold medium, then the hot medium