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  5. <description>Front page of site</description>
  6. <link>https://www.cheresources.com/invision</link>
  7. <pubDate>Fri, 27 Jun 2025 19:02:27 +0000</pubDate>
  8. <ttl>180</ttl>
  9. <item>
  10. <title>Distillation Column Top Pressure</title>
  11. <link>https://www.cheresources.com/invision/topic/32645-distillation-column-top-pressure/</link>
  12. <description><![CDATA[Dear all, <br>
  13. <br>
  14. I would like to understand Distillation Column Top Pressure and Pressure in Reflux drum for total condenser. (Debutanizer Column)<br>
  15. <br>
  16. 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>
  17. <br>
  18. 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>
  19. <br>
  20. 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>
  21. <br>
  22. 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>
  23. <br>
  24. Kindly guide me. Love to understand the things properly instead of feeling or saying, that is how it is or it works.]]></description>
  25. <pubDate>Fri, 27 Jun 2025 19:02:27 +0000</pubDate>
  26. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32645-distillation-column-top-pressure/</guid>
  27. </item>
  28. <item>
  29. <title>Htri，</title>
  30. <link>https://www.cheresources.com/invision/topic/32642-htri，/</link>
  31. <description>htri，The calculated height under the inlet nozzle was limited to 30% of the shell diameter.what is meaning 。</description>
  32. <pubDate>Thu, 26 Jun 2025 04:01:11 +0000</pubDate>
  33. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32642-htri，/</guid>
  34. </item>
  35. <item>
  36. <title>Packaging And Gas Velocity In Packed Column</title>
  37. <link>https://www.cheresources.com/invision/topic/32641-packaging-and-gas-velocity-in-packed-column/</link>
  38. <description><![CDATA[<p><span  style="font-size:18px">Good day to everyone, I am designing an absorption column to remouve methanol from a CO2 stream at 50 bar and 35°C with water.<br>
  39. I have no experience regarding absorption columns, so I would like to ask you for two pieces of advice:</span></p>
  40. <ul>
  41. <li><span  style="font-size:18px">generally what velocity should the gas have inside the column (I just need the order of magnitude)?</span></li>
  42. <li><span  style="font-size:18px">what filling do you recommend? Are IMTPs okay?</span></li>
  43. </ul>
  44. <p>
  45. <span  style="font-size:18px">Thanks,<br>
  46. Cristiano</span></p>
  47. ]]></description>
  48. <pubDate>Wed, 25 Jun 2025 07:31:04 +0000</pubDate>
  49. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32641-packaging-and-gas-velocity-in-packed-column/</guid>
  50. </item>
  51. <item>
  52. <title><![CDATA[Recommended Installation Location For &#34;pressure High&#34; Interloc]]></title>
  53. <link>https://www.cheresources.com/invision/topic/32639-recommended-installation-location-for-pressure-high-interlock-instrument-on-distillation-column/</link>
  54. <description><![CDATA[<p>Hello,</p>
  55. <p>I am seeking expert advice on the optimal location for a high-pressure switch/transmitter (PAH) that serves as a safety interlock for a distillation column, typically to cut the heat supply to the reboiler.</p>
  56. <p>Based on my understanding, the two primary candidate locations are:</p>
  57. <ol>
  58. <li><strong>Column Top:</strong> In the overhead vapor line or on the reflux drum vapor space.</li>
  59. <li><strong>Column Bottom:</strong> Near the reboiler or in the bottom liquid line.</li>
  60. </ol>
  61. <p>My questions are:</p>
  62. <ul>
  63. <li><strong>Which location is generally preferred as the primary high-pressure trip point and why?</strong></li>
  64. <li>How does the choice of location depend on the specific overpressure scenario we are protecting against? For example:
  65. <ul>
  66. <li>For a <strong>condenser failure</strong> or <strong>blocked vapor outlet</strong>, is a top-side sensor always superior for faster detection?</li>
  67. <li>For a <strong>reboiler control failure</strong> (runaway heating) or <strong>blocked bottoms outlet</strong>, is a bottom-side sensor more effective?</li>
  68. </ul>
  69. </li>
  70. <li>Is it a common design practice to install <strong>high-pressure interlocks at both the top and bottom</strong> of the column for comprehensive protection?</li>
  71. <li>What is the standard industry practice &nbsp;for this specific safety-critical interlock?</li>
  72. </ul>
  73. <p>Thank you for sharing your experience and insights.</p>
  74. ]]></description>
  75. <pubDate>Fri, 20 Jun 2025 07:44:00 +0000</pubDate>
  76. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32639-recommended-installation-location-for-pressure-high-interlock-instrument-on-distillation-column/</guid>
  77. </item>
  78. <item>
  79. <title>Best Practices For Handling 50% Hf – Equipment Failures Issue</title>
  80. <link>https://www.cheresources.com/invision/topic/32638-best-practices-for-handling-50-hf-–-equipment-failures-issue/</link>
  81. <description><![CDATA[<p><strong>Hello Everyone,</strong><br>
  82. &nbsp;</p>
  83. <p>Glad to connect&nbsp;<br>
  84. &nbsp;</p>
  85. <p>We are currently working with the storage and transfer of <strong>dilute hydrofluoric acid (50% by weight)</strong>. However, we often face failures in equipment, valves, and instrumentation due to its highly corrosive nature.<br>
  86. &nbsp;</p>
  87. <p>I would be grateful if you could share your insights on how to handle such a corrosive fluid effectively, without compromising equipment integrity or product quality.<br>
  88. <br>
  89. we&nbsp; already use the PTFE coated&nbsp; pipe line /valves/equipment.&nbsp;&nbsp;</p>
  90. ]]></description>
  91. <pubDate>Fri, 20 Jun 2025 04:52:31 +0000</pubDate>
  92. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32638-best-practices-for-handling-50-hf-–-equipment-failures-issue/</guid>
  93. </item>
  94. <item>
  95. <title>Design Capacity Of Hydrogen Pullet During Hydroprocessing Units Upset</title>
  96. <link>https://www.cheresources.com/invision/topic/32637-design-capacity-of-hydrogen-pullet-during-hydroprocessing-units-upset/</link>
  97. <description><![CDATA[Dears ,<br>
  98. I want to design Hydrogen Pullet capacity during Hydroprocessing units upset .Currently we have two hydrogen plant production with total capacity 20 TPH and supply to diesel unit approximately 5 TPH and Hydrocraker unit approximately 15 TPH .During any upset of these unit Hydrogen will go to flare . I want to design hydrogen pullet to store this hydrogen and can be used again . Please can you help <br>
  99. <br>
  100. Thanks ]]></description>
  101. <pubDate>Thu, 19 Jun 2025 04:58:32 +0000</pubDate>
  102. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32637-design-capacity-of-hydrogen-pullet-during-hydroprocessing-units-upset/</guid>
  103. </item>
  104. <item>
  105. <title>Hello， Design Of Natural Gas Liquefaction Processes.</title>
  106. <link>https://www.cheresources.com/invision/topic/32635-hello，-design-of-natural-gas-liquefaction-processes/</link>
  107. <description>Dear all, I am in need of a technical manual focused on the design of natural gas liquefaction processes. Any help would be greatly appreciated</description>
  108. <pubDate>Wed, 18 Jun 2025 16:10:50 +0000</pubDate>
  109. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32635-hello，-design-of-natural-gas-liquefaction-processes/</guid>
  110. </item>
  111. <item>
  112. <title>Three Phase Seperator Modification</title>
  113. <link>https://www.cheresources.com/invision/topic/32633-three-phase-seperator-modification/</link>
  114. <description><![CDATA[<p>It is often observed while modification of Three phase Seperators due to carryover of water in Hydrocarbon liquid, the weir is extended towards Lighter liquid i.e hydrocarbon side of the vessel but its weir height is reduced post this change. Any logic to reduce weir height please?</p>
  115. <p>&nbsp;</p>
  116. <p>Attached the reference drawing for better understanding.</p>
  117. ]]></description>
  118. <pubDate>Tue, 10 Jun 2025 16:15:49 +0000</pubDate>
  119. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32633-three-phase-seperator-modification/</guid>
  120. </item>
  121. <item>
  122. <title>Psv On Centrifugal Compressor Discharge</title>
  123. <link>https://www.cheresources.com/invision/topic/32632-psv-on-centrifugal-compressor-discharge/</link>
  124. <description><![CDATA[Hello, <br>
  125. <br>
  126. Please I need guidance related to centrifugal compressors. Does the driver type (Steam turbine or motor) of a centrifugal compressor has an impact on the requirement for a PSV at the discharge? ]]></description>
  127. <pubDate>Tue, 10 Jun 2025 15:55:26 +0000</pubDate>
  128. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32632-psv-on-centrifugal-compressor-discharge/</guid>
  129. </item>
  130. <item>
  131. <title><![CDATA[Distillation Column Top &#38; Bottom Temperatures]]></title>
  132. <link>https://www.cheresources.com/invision/topic/32631-distillation-column-top-bottom-temperatures/</link>
  133. <description><![CDATA[<p>Dear All,</p>
  134. <p>&nbsp;</p>
  135. <p>Q1. I would like to understand, how to finalize the top and bottom temperatures of the distillation column?</p>
  136. <p>&nbsp;</p>
  137. <p>From my understanding the top temperature should be the above the dew point of the overhead vapor composition.&nbsp;</p>
  138. <p>&nbsp;</p>
  139. <p>Bottom reboiler outlet temperature is based on the bottom products composition bubble point temperature and boil-up ratio, From bubble point of bottom product to %vaporization needed decides the temperature point in between its bubble and dew point of the mixture.</p>
  140. <p>&nbsp;</p>
  141. <p>Kindly guide. Any references in evaluation of top and bottom temperatures in the columns helps. Thanks.</p>
  142. <p>&nbsp;</p>
  143. <p>&nbsp;</p>
  144. ]]></description>
  145. <pubDate>Mon, 09 Jun 2025 06:55:57 +0000</pubDate>
  146. <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32631-distillation-column-top-bottom-temperatures/</guid>
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