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  1. <?xml version="1.0" encoding="UTF-8" ?>
  2. <rss version="2.0">
  3. <channel>
  4. <title>front_page</title>
  5. <description>Front page of site</description>
  6. <link>https://www.cheresources.com/invision</link>
  7. <pubDate>Tue, 22 Jul 2025 21:40:19 +0000</pubDate>
  8. <ttl>180</ttl>
  9. <item>
  10. <title>Automatic Choke Valve</title>
  11. <link>https://www.cheresources.com/invision/topic/32664-automatic-choke-valve/</link>
  12. <description><![CDATA[Dear Professional,<br>
  13. <br>
  14. I am a entrant in the field of oil and gas, and am working in the engineering procurement and construction department of the company. Today, I was assigned to develop the datasheet for automatic choke valve for a remote well with WHFP of 5500 psig at 70 MMScfd gas flowrate and a CGR of 5-10 bbl/MMscfd and WGR of 1 bbl/MMscfd. We want the sizing of auto choke to be done at maxium/normal/minimum of 70/50/25 mmscfd gas flowrate. Everything is going good but there is a discusion with which i am confused, which is about the selection of valve characteristics of this automated choke valve. One process engineer suggests equal percentage and other saying linear. One is saying linear would be best suited if we had oil wells and other is saying equal percentage would not provide better control over flow as a small opening will result in increase in flowrate. I am in a bit of confusion state.<br>
  15. <br>
  16. I welcome you all for the discussion to better understand the role of valve characteristics in chike valve.]]></description>
  17. <pubDate>Tue, 22 Jul 2025 21:40:19 +0000</pubDate>
  18. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32664-automatic-choke-valve/</guid>
  19. </item>
  20. <item>
  21. <title>Overworked?</title>
  22. <link>https://www.cheresources.com/invision/topic/32660-overworked/</link>
  23. <description><![CDATA[<p><span  style="color:rgb(51,61,66);font-family:'-apple-system', BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol', sans-serif;">I started my first job working as a process engineer for a refinery 8 months ago and started a new role 3 months ago and have started to feel so burnt out. I regularly work 55-60 hour weeks and sometimes have to do work on the weekends. It’s got to the point where I don’t even feel I can perform to my best abilities because I just have so much work while learning my role while attending meetings. I was wondering if that’s common in refining and what yall think.</span></p>
  24. ]]></description>
  25. <pubDate>Thu, 17 Jul 2025 09:36:10 +0000</pubDate>
  26. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32660-overworked/</guid>
  27. </item>
  28. <item>
  29. <title><![CDATA[[Research Request] Uc Berkeley Student Seeking Process Engineers For 1]]></title>
  30. <link>https://www.cheresources.com/invision/topic/32658-research-request-uc-berkeley-student-seeking-process-engineers-for-15-20-min-interviews-on-design-bottlenecks/</link>
  31. <description><![CDATA[<p><em>I apologize in advance if this research request disrupts the professional discussions in this forum. If this post is inappropriate or violates any community guidelines, I'll be happy to remove it immediately.</em></p>
  32. <p>&nbsp;</p>
  33. <p>Hi everyone,</p>
  34. <p>&nbsp;</p>
  35. <p>I'm Sangyun Kim, an undergraduate researcher at UC Berkeley currently working on a project about identifying and understanding time-consuming bottlenecks in process design workflows.</p>
  36. <p>&nbsp;</p>
  37. <p>I have tremendous respect for the wealth of experience and diverse backgrounds represented in this community, and I'm eager to learn from your expertise.</p>
  38. <p>&nbsp;</p>
  39. <p>My ultimate goal is to explore how AI technologies might help address these time delays and improve design efficiency.</p>
  40. <p>&nbsp;</p>
  41. <p><strong>What I'm researching:</strong> I'm trying to identify which specific stages or activities in the process design workflow take the most time and understand the underlying reasons why these bottlenecks occur. My goal is to pinpoint where engineers spend disproportionate amounts of time and what factors contribute to these delays.</p>
  42. <p>&nbsp;</p>
  43. <p><strong>What I'm looking for:</strong> I'd love to hear from process engineers (especially those with 5+ years of experience) about:</p>
  44. <ul>
  45. <li>Which parts of the process design workflow consume the most time in your experience</li>
  46. <li>What specific factors or challenges make these stages so time-intensive</li>
  47. <li>Whether these bottlenecks are due to technical complexity, lack of information, iterative revisions, or other factors</li>
  48. </ul>
  49. <p><strong>Time commitment:</strong> Just 15-20 minutes of your time via phone, video call, or even email if that works better for you.</p>
  50. <p>&nbsp;</p>
  51. <p>I'm genuinely interested in learning from practitioners about the real-world challenges you face in design timelines. If you're open to a brief conversation about your experience with process design bottlenecks, please feel free to DM me or comment below.</p>
  52. <p>&nbsp;</p>
  53. <p>You can also reach me directly at: toomstar@postech.ac.kr</p>
  54. <p>&nbsp;</p>
  55. <p>Thanks for considering, and I look forward to connecting with some of you!</p>
  56. <p>Best,</p>
  57. <p>Sangyun Kim</p>
  58. <p>UC Berkeley Exchange Student</p>
  59. <p>&nbsp;</p>
  60. ]]></description>
  61. <pubDate>Thu, 10 Jul 2025 19:42:02 +0000</pubDate>
  62. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32658-research-request-uc-berkeley-student-seeking-process-engineers-for-15-20-min-interviews-on-design-bottlenecks/</guid>
  63. </item>
  64. <item>
  65. <title>Steam On Shell Side Of A Vertical Hex</title>
  66. <link>https://www.cheresources.com/invision/topic/32657-steam-on-shell-side-of-a-vertical-hex/</link>
  67. <description>Hello, can the allocation of steam in the shell side of a vertical heat exchanger cause corrosion problems ? Due to excessive vibration, I had to allocate the steam on the shell side and changing to a floating head to cover the thermal expansion... just want to know the negative aspects of this choice. Thank you </description>
  68. <pubDate>Wed, 09 Jul 2025 21:45:19 +0000</pubDate>
  69. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32657-steam-on-shell-side-of-a-vertical-hex/</guid>
  70. </item>
  71. <item>
  72. <title>Negative Pressure Discharge  / Negative At High Point</title>
  73. <link>https://www.cheresources.com/invision/topic/32653-negative-pressure-discharge-negative-at-high-point/</link>
  74. <description><![CDATA[<p>Hello, I am trying to size a pump system but this results to a negative discharge. I am trying to pump a water at 25 C to 50ft above grade. This results to a negative differential head. The path is that it must go up the piperack of 50ft then passes through it then goes back to grade level for some reason. Can you please help me what missing concepts I am here? Please see the result of the sizing using a software below (see attached file)<br>
  75. &nbsp;</p>
  76. <div id='attach_wrap' class='clearfix'>
  77. <h4>Attached Files</h4>
  78. <ul>
  80. <li class='attachment'>
  81. <a href="https://www.cheresources.com/invision/index.php?app=core&module=attach&section=attach&attach_id=17537" title="Download attachment"><img src="https://www.cheresources.com/invision/public/style_extra/mime_types/pdf.gif" alt="Attached File" /></a>
  82. &nbsp;<a href="https://www.cheresources.com/invision/index.php?app=core&module=attach&section=attach&attach_id=17537" title="Download attachment"><strong>Sketch.pdf</strong></a> &nbsp;&nbsp;<span class='desc'><strong>38.01KB</strong></span>
  83. &nbsp;&nbsp;<span class="desc lighter">20 downloads</span>
  84. </li>
  86. </ul>
  87. </div>]]></description>
  88. <pubDate>Sat, 05 Jul 2025 12:20:23 +0000</pubDate>
  89. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32653-negative-pressure-discharge-negative-at-high-point/</guid>
  90. </item>
  91. <item>
  92. <title>Compressor Suction Drum</title>
  93. <link>https://www.cheresources.com/invision/topic/32652-compressor-suction-drum/</link>
  94. <description>Is there a rule that mandate to have a separate compressor suction drum for each compressor(2×50% compressors running in parallel)? What are the consequences of having one suction drum for both compressors ? </description>
  95. <pubDate>Fri, 04 Jul 2025 19:34:46 +0000</pubDate>
  96. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32652-compressor-suction-drum/</guid>
  97. </item>
  98. <item>
  99. <title>Free Vent For Api 650 Tank - Bug Screen / Bird Screen Requirement</title>
  100. <link>https://www.cheresources.com/invision/topic/32651-free-vent-for-api-650-tank-bug-screen-bird-screen-requirement/</link>
  101. <description><![CDATA[<p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">Hello everyone, I have used this forum to get answers about chemical engineering problems. This is the first time I am posting here; therefore, I apologize in advance for any misunderstanding.</p>
  102. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  103. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">I use API 2000 to calculate the free vent size of a firewater storage tank design with respect to API 650. Firstly, I define the required flow rate according to tank dimensions, inlet/outlet flow rates, and other specifications. Secondly, I calculate the required free area with respect to API 2000 equation 25 by taking a discharge coefficient of 0.6. The result shows that 11.3 inches in diameter is required, but I choose a 14-inch-diameter free vent. This part is clear for me.</p>
  104. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  105. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">​Since this is a water tank, insects may enter the tank. Therefore, I wanted to put a bug screen on the free vent in order to prevent this situation. This is where my question begins.</p>
  106. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  107. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">1) Firstly, API 650 section 5.8.5.5 defines bird screen requirements with a minimum 19 mm opening size. This size is applicable for the specific location I am from with respect to local regulations; however, adding a bird screen is actually reducing the outlet area and increasing pressure drop. I have calculated that area reduction is not important for 14" pipe since 11.3" free area is required. However, I could not calculate the pressure drop increase because of the screen. Can you guys suggest any relations or references?</p>
  108. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  109. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">2) Secondly, I investigated bug screen mesh sizes. I came to the conclusion that 20x20 mesh would be sufficient. However, this would result in 50% less open area for the free vent. So I have two questions about bug screens:</p>
  110. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  111. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">2a) Should I increase the free vent diameter so that a 20x20 mesh would have 11.3 inches of free area?</p>
  112. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  113. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">2b) Should I decrease the discharge coefficient of 0.6, since there is a flow restriction at the mesh? I could not find a relation between mesh sizes and discharge coefficients in my hydraulic calculation books.</p>
  114. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  115. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">3) Lastly, I tried to look up vendor documents. They put a bug screen/bird screen as an option for PSVs/PVVs/free vents. However, I have not come across a sizing criterion that changes according to this screen requirement.&nbsp;</p>
  116. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  117. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">3a) As a result, I think vendor designs do not require specific design changes according to bird/bug screens. Is this perspective applicable?</p>
  118. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  119. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">3b) As a result, I think vendors may include bird/bug screens in their overpressure scenarios, meaning that they may indicate 50% overpressure because of bird/bug screens. Is this point of view applicable?</p>
  120. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">&nbsp;</p>
  121. <p  style="color:rgb(103,108,116);font-family:'Segoe UI', 'Helvetica Neue', Helvetica, Roboto, Oxygen, Ubuntu, Cantarell, 'Fira Sans', 'Droid Sans', sans-serif;font-size:15px;background-color:rgb(252,252,252);">Thanks in advance. <img src='https://www.cheresources.com/invision/public/style_emoticons/default/smile.png' class='bbc_emoticon' alt=':)' /></p>
  122. ]]></description>
  123. <pubDate>Thu, 03 Jul 2025 09:22:54 +0000</pubDate>
  124. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32651-free-vent-for-api-650-tank-bug-screen-bird-screen-requirement/</guid>
  125. </item>
  126. <item>
  127. <title>Rupture Disc Failure Well Below Max Pressure</title>
  128. <link>https://www.cheresources.com/invision/topic/32650-rupture-disc-failure-well-below-max-pressure/</link>
  129. <description><![CDATA[<p>Hi Folks,</p>
  130. <p>&nbsp;</p>
  131. <p>I’m troubleshooting a puzzling safety-device failure and would appreciate the community’s insight.</p>
  132. <p>&nbsp;</p>
  133.  
  134. Plant & Duty
  135. <ul>
  136. <li>
  137. <p><strong>Unit:</strong> Continuous deodoriser for palm oil (7 horizontal vessels, vacuum stripping).</p>
  138. </li>
  139. <li>
  140. <p><strong>Heating medium:</strong> HP steam loop (~50 bar g @ 240 – 260 °C) from a natural-circulation boiler.</p>
  141. </li>
  142. <li>
  143. <p><strong>Rupture disc:</strong> REMBE <strong>BT-KUB-1</strong>, DN25, Inconel®, rated 95 bar g @ 298 °C (batch 2202109). Installed upstream of the safety valve on the boiler outlet; vent stub rises ~4 m, then to atmosphere.</p>
  144. </li>
  145. <li>
  146. <p><strong>Transmitter:</strong> 54 PI 240 (0 – 100 bar g, 1 s scan rate).</p>
  147. </li>
  148. </ul>
  149.  
  150. Failure history
  151. <div>
  152. <div>
  153.  
  157. Date
  159. Operating pressure when disc burst
  161. Expected burst
  163. Notes
  169. 22 Jun 2025
  171. <strong>20.6 bar g</strong>
  173. 95 bar g
  175. Header temp 189 °C; no PI spike recorded.
  179. Dec 2024 (similar case)
  181. ≈ 25 bar g
  183. 95 bar g
  185. Same disc model & location.
  188.  
  189. <div>
  190. <div><span></span></div>
  191. </div>
  192. </div>
  193. </div>
  194. <p>Trend data show repeated shutdown sequences where pressure falls to the transmitter’s low cut-off (≈ 0.3 bar g) for 6 – 18 h, then ramps slowly back to 60 – 70 bar g during startup.</p>
  195. <p>&nbsp;</p>
  196.  
  197. Two hypotheses
  198. <ol>
  199. <li>
  200. <p><strong>Vacuum-induced low-cycle fatigue</strong></p>
  201. <ul>
  202. <li>
  203. <p>During cooldown the closed steam circuit pulls near-full vacuum (transmitter can’t read below 0 bar g).</p>
  204. </li>
  205. <li>
  206. <p>The reverse-acting dome flexes inward; next startup reverses the load to +70 bar g.</p>
  207. </li>
  208. <li>
  209. <p>After a dozen cycles the burst point drifts down to ~20 bar g and the disc finally opens.</p>
  210. </li>
  211. <li>
  212. <p>Evidence: identical pressure cycles every shutdown; no collateral pipe damage; fracture surface shows beach-marks.</p>
  213. </li>
  214. </ul>
  215. </li>
  216. <li>
  217. <p><strong>Single water-/steam-hammer spike</strong></p>
  218. <ul>
  219. <li>
  220. <p>Condensate in the 4 m vent stub is accelerated by incoming steam, creating a very short 100 + bar pulse that the PI tag misses.</p>
  221. </li>
  222. <li>
  223. <p>The disc ruptures cleanly at the spike, PI plot only captures the 20 bar tail.</p>
  224. </li>
  225. <li>
  226. <p>Evidence: some startup traces show 30–50 bar oscillations; hammer in similar lines has reached 5–10 × design pressure in literature.</p>
  227. </li>
  228. </ul>
  229. </li>
  230. </ol>
  231.  
  232. My questions to the forum
  233. <ol>
  234. <li>
  235. <p><strong>Have you seen reverse-acting discs derate by &gt;70 % purely from vacuum/pressure cycling?</strong> How many cycles did it take?</p>
  236. </li>
  237. <li>
  238. <p><strong>Can a short hammer pulse really shear a KUB-type disc without leaving dents or pipe-support damage nearby?</strong></p>
  239. </li>
  240. </ol>
  241. <p><strong>Thanks in advance for your thoughts!</strong></p>
  242. <div id='attach_wrap' class='clearfix'>
  243. <h4>Attached Thumbnails</h4>
  244. <ul>
  246. <li class=''>
  247. <a class='resized_img' rel='lightbox[134243]' id='ipb-attach-url-17524-0-97559500-1753227011' href="http://www.cheresources.com/invision/uploads/monthly_07_2025/post-371484-0-93977600-1751448626.png" title="Screenshot 2025-07-02 105501.png - Size: 288.86KB"><img itemprop="image" src="http://www.cheresources.com/invision/uploads/monthly_07_2025/post-371484-0-93977600-1751448626_thumb.png" id='ipb-attach-img-17524-0-97559500-1753227011' style='width:250;height:87' class='attach' width="250" height="87" alt="Screenshot 2025-07-02 105501.png" /></a>
  248.  
  249.  
  250. </li>
  252. </ul>
  253. </div><div id='attach_wrap' class='clearfix'>
  254. <h4>Attached Files</h4>
  255. <ul>
  257. <li class='attachment'>
  258. <a href="https://www.cheresources.com/invision/index.php?app=core&module=attach&section=attach&attach_id=17525" title="Download attachment"><img src="https://www.cheresources.com/invision/public/style_extra/mime_types/pdf.gif" alt="Attached File" /></a>
  259. &nbsp;<a href="https://www.cheresources.com/invision/index.php?app=core&module=attach&section=attach&attach_id=17525" title="Download attachment"><strong>2025.06.22_5400_HDK-Berstscheibe_Bilder_002 (1).pdf</strong></a> &nbsp;&nbsp;<span class='desc'><strong>3.05MB</strong></span>
  260. &nbsp;&nbsp;<span class="desc lighter">7 downloads</span>
  261. </li>
  263. </ul>
  264. </div>]]></description>
  265. <pubDate>Wed, 02 Jul 2025 09:32:33 +0000</pubDate>
  266. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32650-rupture-disc-failure-well-below-max-pressure/</guid>
  267. </item>
  268. <item>
  269. <title>Distillation Column Top Pressure</title>
  270. <link>https://www.cheresources.com/invision/topic/32645-distillation-column-top-pressure/</link>
  271. <description><![CDATA[Dear all, <br>
  272. <br>
  273. I would like to understand Distillation Column Top Pressure and Pressure in Reflux drum for total condenser. (Debutanizer Column)<br>
  274. <br>
  275. Q1. At the top tray where liquid and Vapor are leaving, the top pressure is maintained by the liquid mixture leaving the top tray through its equilibrium Vapor pressure or any impact of Vapor leaving the tray on the top column pressure?<br>
  276. <br>
  277. Q2. Once the Vapor gets condensed and gets collected at the top, my reflux drum pressure is also found to be almost same? The pressure in the reflux drum again is due to the liquid mixture Equilibrium vapor pressure? <br>
  278. <br>
  279. Q3. I would like to understand, apart from normal flow pressure loss, why normally distillation column top Vapor condensation doesn't bring down the pressure in reflux drum? How to understand it? <br>
  280. <br>
  281. Q4. How to understand the pressure concept for any random tray in the column? If liquid Vapor pressure is what is causing pressure, bottom trays contain heavier and the equilibrium liquid vapor pressure should drop due to heaviers in the liquid mixture, but in reality pressure profile is like high at the bottom, from my understanding, it is high due to high temperature of the heavier mixture which has created sufficient equilibrium Vapor pressure more than the light liquid mixture Equilibrium vapor pressure at the top? <br>
  282. <br>
  283. Kindly guide me. Love to understand the things properly instead of feeling or saying, that is how it is or it works.]]></description>
  284. <pubDate>Fri, 27 Jun 2025 19:02:27 +0000</pubDate>
  285. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32645-distillation-column-top-pressure/</guid>
  286. </item>
  287. <item>
  288. <title>Htri，</title>
  289. <link>https://www.cheresources.com/invision/topic/32642-htri，/</link>
  290. <description>htri，The calculated height under the inlet nozzle was limited to 30% of the shell diameter.what is meaning 。</description>
  291. <pubDate>Thu, 26 Jun 2025 04:01:11 +0000</pubDate>
  292. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32642-htri，/</guid>
  293. </item>
  294. </channel>
  295. </rss>

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