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line 135, column 0: style attribute contains potentially dangerous content: color:rgb(36,36,36);font-family:'Segoe UI', '-apple-system', BlinkMacSystemFont, Roboto, 'Helvetica Neue', sans-serif;background-color:rgb(250,250,250); (5 occurrences) [help]
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		<description><![CDATA[<p  style="color:rgb(36,36,36);font-family:'Segoe UI ...
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line 171, column 0: Missing atom:link with rel="self" [help]
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Source: https://www.cheresources.com/invision/rss/forums/1-front-page/

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<channel>
<title>front_page</title>
<description>Front page of site</description>
<link>https://www.cheresources.com/invision</link>
<pubDate>Sat, 17 May 2025 06:25:31 +0000</pubDate>
<ttl>180</ttl>
<item>
<title>Pumpback Reflux</title>
<link>https://www.cheresources.com/invision/topic/32625-pumpback-reflux/</link>
<description><![CDATA[Dear All,
 
We often see Fractionation columns with only top reflux and few fractionation columns with Pump back reflux and top reflux configuration.
 
Q1. What is the basis to introduce Pumpback reflux in a fractionation column along with top reflux flow configuration?
 
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)
 
Q3. How the variation of pumpback reflux flow affects the distillation of intermediate product cut and its immediate bottom cut? 
 
Kindly guide me. Thanks.
]]></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[Good day!
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!
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.
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.
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.
Once again, many thanks for your support as usual!!
 
 
]]></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[Hello, 
 
Has anyone come across a reciprocating compressor setup with non-symmetrical redundancy, something like 20%, 30%, and 50% capacity units in parallel?
 
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?
 
Would appreciate any real-world examples or lessons learned. 
 
Thanks!
]]></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[Hello all,
 
Does anybody have experience in the interior lining of a carbon steel phosphoric acid storage tank?
 
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?
 
The fluorine in the acid is a little higher than normal as well.
 
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. 
 
We currently are looking at this for a new 2000 ton storage tank. 
 
Phosphoric acid 
P2o5- 56%
F- 0.6% 
 
Thanks very much guys, Any help would be greatly appreciated.
]]></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, 
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. 
My question is that I have to count tee straight for flow through normally no flow line or not. 
 
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[Good day,  
 
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.  
Tank Diameter= 10m 
Inlet size= DN150, SCH40 
Max fill rate= 470 m3/hr  
 
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 
 
]]></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>
<item>
<title>Ammonia Line Vapor Generation</title>
<link>https://www.cheresources.com/invision/topic/32432-ammonia-line-vapor-generation/</link>
<description><![CDATA[Hello Team,
We are experiencing an issue with our 100KL Ammonia storage tank transfer system. The system includes a 8 m³/hr transfer pump that moves ammonia from the storage area to the processing block. However, we have encountered significant challenges during the transfer process, particularly in the afternoon hours from 12 PM to 4 PM.
Problem Description:
<ol>
<li>
Vapor Generation in Suction Line: The transfer lines are exposed to solar radiation, leading to an increase in temperature. This exposure results in vapor generation within the suction line during pump operation.
</li>
<li>
Heating of Suction  Lines (2" line size): Suction lines are getting heated due to solar radiation, exacerbating the vapor generation issue.
</li>
<li>
Pump Starvation: Despite checking and confirming that the pump suction strainer is in good condition, we are experiencing pump starvation during the afternoon hours. This leads to a complete cessation of material flow during the transfer process.
</li>
</ol>
We are thinking to insulate the line; however, seek your expertise/experience if that will be enough to cater the issue.
Thank you for your support.
]]></description>
<pubDate>Mon, 07 Apr 2025 06:35:02 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32432-ammonia-line-vapor-generation/</guid>
</item>
<item>
<title>Liquid Liquid Separator Sizing</title>
<link>https://www.cheresources.com/invision/topic/32422-liquid-liquid-separator-sizing/</link>
<description><![CDATA[Hi everyone,
 
I am currently designing a liquid-liquid separator for a mixture of FFA-glycerine with methanol. The process is as follows: the crude glycerine is sent to a process called acidification, where impurities, especially MONG, are removed by adding acid. After acidification, the mixture is sent to a decanter, where it separates into a layer of FFA-glycerine.
 
At this stage, I am designing the separator but am feeling a bit lost, particularly when it comes to assuming the properties to be used. I also have doubts about some of the values I’ve already calculated. As someone new to the industry and a recent graduate, I am reaching out for your help and expertise.
 
Attached is the work I have already started.
 
<a href='https://drive.google.com/file/d/15eLSW9ukIXchpEUGBxoJ7aRByLHVhuIt/view?usp=sharing' class='bbc_url' title='' rel='nofollow'>https://drive.google.com/file/d/15eLSW9ukIXchpEUGBxoJ7aRByLHVhuIt/view?usp=sharing</a>
]]></description>
<pubDate>Thu, 03 Apr 2025 08:44:20 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32422-liquid-liquid-separator-sizing/</guid>
</item>
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