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<?xml version="1.0" encoding="UTF-8" ?><rss version="2.0"><channel> <title>front_page</title> <description>Front page of site</description> <link>https://www.cheresources.com/invision</link> <pubDate>Wed, 04 Jun 2025 17:00:28 +0000</pubDate> <ttl>180</ttl> <item> <title>Lng Boil Off Gas Compressor Suction Drum</title> <link>https://www.cheresources.com/invision/topic/32630-lng-boil-off-gas-compressor-suction-drum/</link> <description><![CDATA[Hello, please I need guidance regarding the sizing procedure for an LNG bog compressor drum, I'm doing reverse engineering for LNG plants and I have been stuck on the BOG compressor drum since there is LNG quench coming from the tank, I want to know how the flowrate of the quench LNG is estimated and how the drum is sized ? Also, by evaluating different heat and material balances I noticed that the BOG and LNG quench don’t have the same pressure, so how they are mixed in the drum if they don’t have the same pressure ? Also can the mixing and the drum be modeled using Aspen hysys? Thank you for your guidance]]></description> <pubDate>Wed, 04 Jun 2025 17:00:28 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32630-lng-boil-off-gas-compressor-suction-drum/</guid> </item> <item> <title>Level Control Valve</title> <link>https://www.cheresources.com/invision/topic/32629-level-control-valve/</link> <description><![CDATA[1-Does anyone know how to determine minimum flow of level control valve located at pump discarge because I have case of max=110% norm=100% min=39%, why is it 39% in the process Datasheet.<br>(While the pump minimum flow =50% in the process DS I don't know if it's from pump vendor because there's minimum circulation control valve too, so why is it 50% for the centrifugal pump too?.<br>2- how to calculate for the above control valve the ∆p of max, normal, minimum flow of a control valve to fill it in the process Datasheet (is it by conell method).]]></description> <pubDate>Tue, 03 Jun 2025 08:05:19 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32629-level-control-valve/</guid> </item> <item> <title>Pumpback Reflux</title> <link>https://www.cheresources.com/invision/topic/32625-pumpback-reflux/</link> <description><![CDATA[<p>Dear All,</p><p> </p><p>We often see Fractionation columns with only top reflux and few fractionation columns with Pump back reflux and top reflux configuration.</p><p> </p><p>Q1. What is the basis to introduce Pumpback reflux in a fractionation column along with top reflux flow configuration?</p><p> </p><p>Q2. Like Optimum Reflux flow maintaining at 1.2 to 1.5 times to minimum reflux flow, is there such any rule for pumback reflux flow? ( Optimum Pumpback reflux flow)</p><p> </p><p>Q3. How the variation of pumpback reflux flow affects the distillation of intermediate product cut and its immediate bottom cut? </p><p> </p><p>Kindly guide me. Thanks.</p>]]></description> <pubDate>Sat, 17 May 2025 06:25:31 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32625-pumpback-reflux/</guid> </item> <item> <title>Steam Sparger In Atmospheric Water Tank</title> <link>https://www.cheresources.com/invision/topic/32624-steam-sparger-in-atmospheric-water-tank/</link> <description><![CDATA[<p>Good day!</p><p>I saw many things concerning steam sparger on the forum, but I miss one thing to be sure of my design! If you can help me it will be really appreciated!</p><p>I need to inject in a water tank around 660 lbs/h (300 kg/h) of steam (around 6 barg and 200°C). The pressure in the tank at sparger level is 2,9 psi (0,2 bar) because it is just an atmospheric tank.</p><p>typically I have done a sparger with small holes and my calculation give a result of 30m/s IN the sparger and the pressure drop through the sparger is only 0,02 bar. This is low to keep a velocity through the holes around 35-40m/s. The pressure drop is very low. And finally I can not find a criteria on the speed of steam in the holes.</p><p>Can you just tell me what is the criteria for the holes velocity please? I think the 25-30m/s inside the pipe is high but good. I just want to see with you the velocity and pressure drop to be sure.</p><p>Once again, many thanks for your support as usual!!</p><p> </p><p> </p>]]></description> <pubDate>Fri, 16 May 2025 20:32:21 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32624-steam-sparger-in-atmospheric-water-tank/</guid> </item> <item> <title>Parallel Compressor Setup With Uneven Capacities</title> <link>https://www.cheresources.com/invision/topic/32623-parallel-compressor-setup-with-uneven-capacities/</link> <description><![CDATA[<p><span style="color:rgb(0,0,0)">Hello,<br><br>Has anyone come across a reciprocating compressor setup with non-symmetrical redundancy, something like 20%, 30%, and 50% capacity units in parallel?</span></p><p class="" style="color:rgb(0,0,0)"> </p><p class="" style="color:rgb(0,0,0)">Curious how the flow distribution and control were handled. Was one unit used as a trim? Any issues with load sharing, suction pressure imbalance, or control logic?</p><p class="" style="color:rgb(0,0,0)"> </p><p class="" style="color:rgb(0,0,0)">Would appreciate any real-world examples or lessons learned.<br><br>Thanks!</p>]]></description> <pubDate>Tue, 13 May 2025 12:19:29 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32623-parallel-compressor-setup-with-uneven-capacities/</guid> </item> <item> <title>Chemical Engineering Resources</title> <link>https://www.cheresources.com/invision/topic/32448-chemical-engineering-resources/</link> <description><![CDATA[<div>I will voluntarily end my professional engineering career next week. With that goes my access to commercial engineering software.</div><div>I am still a process engineer even if no one pays me! What free chemical engineering software have you found useful?</div><div> </div><div>Have you tried the open-source DWSIM? <a href='https://sourceforge.net/projects/dwsim/' class='bbc_url' title='' rel='nofollow'>https://sourceforge.net/projects/dwsim/</a></div><div>Have you used any of the other 100 plus open-source chemical engineering software projects at <a href='https://sourceforge.net/directory/scientific-engineering/windows/?q=chemical+engineering' class='bbc_url' title='' rel='nofollow'>https://sourceforge.net/directory/scientific-engineering/windows/?q=chemical+engineering</a> ?</div><div>I am not interested in trying every unknown software package so am looking for discussion.</div><div>Any recommendations for free/cheap calculation packages or engineering related software for tinkering and exploring?</div>]]></description> <pubDate>Thu, 24 Apr 2025 12:23:17 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32448-chemical-engineering-resources/</guid> </item> <item> <title>Phosphoric Acid 56% Tank Lining</title> <link>https://www.cheresources.com/invision/topic/32443-phosphoric-acid-56-tank-lining/</link> <description><![CDATA[<p>Hello all,</p><p> </p><p>Does anybody have experience in the interior lining of a carbon steel phosphoric acid storage tank?</p><p> </p><p>Currently, we only use the carbon bricks + rubber lining solution, mostly chlorobutyl. Is there any other solution for example similar to novolac that has had good and long lasting results?</p><p> </p><p>The fluorine in the acid is a little higher than normal as well.</p><p> </p><p>Further to this, has anybody had experience with the insulation for the concrete foundation of the tank? Current system is rubber sheet with acid resistant bricks and furan mortar. </p><p> </p><p>We currently are looking at this for a new 2000 ton storage tank. </p><p> </p><p>Phosphoric acid </p><p>P2o5- 56%</p><p>F- 0.6% </p><p> </p><p>Thanks very much guys, Any help would be greatly appreciated.</p>]]></description> <pubDate>Sun, 20 Apr 2025 19:13:45 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32443-phosphoric-acid-56-tank-lining/</guid> </item> <item> <title>Recommended Fluid Velocity</title> <link>https://www.cheresources.com/invision/topic/32442-recommended-fluid-velocity/</link> <description><![CDATA[<div>I am interested in the recommended velocity in liquid pipelines. API 14 in table 2.3 states for suction line 2-3 ft/s and discharge 6-9 ft/s for centrifugal pumps. But my question is about pipeline pumping light naphtha, if the same figgers are applicable or not, as it is volatile liquid.</div><div>Somewhere I read it should be between 0.9-1.8 m/s. Is there a source for this recommendation somewhere? Thanks</div>]]></description> <pubDate>Wed, 16 Apr 2025 05:56:55 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32442-recommended-fluid-velocity/</guid> </item> <item> <title>Flow Through Normally No Flow Line</title> <link>https://www.cheresources.com/invision/topic/32439-flow-through-normally-no-flow-line/</link> <description><![CDATA[Hi, <br>I am doing hydraulic calculation by using number of tee branch/tee straight from isometric drawing. However, I am not sure about flow through normally no flow line e.g. branch to drain line, inlet of PSV, line with NC/LC valves, bypass line of control valve. <br>My question is that I have to count tee straight for flow through normally no flow line or not.<br><br>Thank you very much in advance.]]></description> <pubDate>Tue, 08 Apr 2025 23:51:53 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32439-flow-through-normally-no-flow-line/</guid> </item> <item> <title>Tank Inlet Diffuser Length</title> <link>https://www.cheresources.com/invision/topic/32437-tank-inlet-diffuser-length/</link> <description><![CDATA[<p>Good day, <br><br>I was task to calculate Inlet Diffuser for a tank. Upon calculation, I concluded on having 28 diffuser slot to maximize flow efficiency (0.976 m/s) which must be close to 1. However, the total length recommended is around 5700 mm which is more than 30% of tank diameter based on standard practice. <br>Tank Diameter= 10m<br>Inlet size= DN150, SCH40<br>Max fill rate= 470 m3/hr <br><br>My question is whether is okay to exceed standard practice (not regulation) to maximize the infuser flow, or are there any standard which can be serve as basis of the calculation. Tried browsing on API650 but there is nothing about diffuser length<br> </p>]]></description> <pubDate>Tue, 08 Apr 2025 06:52:14 +0000</pubDate> <guid isPermaLink="false">https://www.cheresources.com/invision/topic/32437-tank-inlet-diffuser-length/</guid> </item></channel></rss>If you would like to create a banner that links to this page (i.e. this validation result), do the following:
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