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line 48, 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 169, column 0: Missing atom:link with rel="self" [help]
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Source: https://www.cheresources.com/invision/rss/forums/1-front-page/

<?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, 16 Apr 2025 05:56:55 +0000</pubDate>
<ttl>180</ttl>
<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>
<item>
<title>Discussion - Predict Storage Tank Heat Transfer Precisely By Jimmy D K</title>
<link>https://www.cheresources.com/invision/topic/32413-discussion-predict-storage-tank-heat-transfer-precisely-by-jimmy-d-kumana-and-samir-p-kothari/</link>
<description><![CDATA[Hello,
 
I am try to use the calculation method defined in the paper published by Jimmy D Kumana and Samir P Kothari to Predict Storage tank heat transfer precisely. 
Here is the link of a post in this forum -
 
<a href='https://www.cheresources.com/invision/topic/9066-storage-tank-heat-loss-calculation-based-on-kumana-and-kothari-article/' class='bbc_url' title=''>https://www.cheresources.com/invision/topic/9066-storage-tank-heat-loss-calculation-based-on-kumana-and-kothari-article/</a>
<a href='https://www.cheresources.com/invision/topic/28427-natural-convection-heat-transfer-coefficient-inside-storage-tanks/' class='bbc_url' title=''>https://www.cheresources.com/invision/topic/28427-natural-convection-heat-transfer-coefficient-inside-storage-tanks/</a>
 
is it possible to use this calculation method with a vertical, outside, atmospheric storage tank with an agitator, which adds forced convection component in the calculation.
Will it be correct to replace the Natural convection parts in the calculation with a forced convection?
here are some articles showing how to calculate the inside heat transfer coefficient of tank with an agitator. 
 
<a href='https://pdhonline.com/courses/k102/k102content.pdf' class='bbc_url' title='' rel='nofollow'>https://pdhonline.com/courses/k102/k102content.pdf</a>
<a href='https://www.thermopedia.com/content/547/' class='bbc_url' title='' rel='nofollow'>https://www.thermopedia.com/content/547/</a>
 
please share your thoughts. it will be really helpful.
 
Thank you,
Raj Shekhar Ghosh
]]></description>
<pubDate>Tue, 25 Mar 2025 11:23:41 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32413-discussion-predict-storage-tank-heat-transfer-precisely-by-jimmy-d-kumana-and-samir-p-kothari/</guid>
</item>
<item>
<title>Resistance K Of Reducers</title>
<link>https://www.cheresources.com/invision/topic/32410-resistance-k-of-reducers/</link>
<description><![CDATA[Hello, 
I have a question regarding the resistance K values for reducers and enlargers, as the calculated values appear to be excessively high.
Based on my research, I found that there are three commonly referenced sources for resistance K values:
 
1. Crane
 
2. 3K-Method
 
3. API 521
 
Among these, the Crane and 3K-Method approaches tend to produce very high K values, which result in significant pressure drops. 
In contrast, although the K values from API 521 are quite low, they are similar to the exit and entrance K values found in Crane.
Additionally, I am unsure whether the resistance K values represent only frictional losses, or if they also account for losses due to changes in pipe diameter (i.e., expansion or contraction effects).
I am currently performing discharge line sizing in order to calculate the backpressure.
Could you please clarify this?
]]></description>
<pubDate>Fri, 21 Mar 2025 02:41:07 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32410-resistance-k-of-reducers/</guid>
</item>
<item>
<title>Minimize Particles Carryover In Reduction Autoclave</title>
<link>https://www.cheresources.com/invision/topic/32390-minimize-particles-carryover-in-reduction-autoclave/</link>
<description><![CDATA[Guys,
 
I would like to discuss about different methods on reducing solids carryover in our reduction autoclave. 
Particle size distribution: 100 to 350 US mesh. 
Allowed particle settling time: 10 minutes.
Discharge pressure: 1500 kpag to an atmospheric tank
Discharge line size: 1-1/2". 
 
Question is: methods to reduce solids carryover through discharge. 
I have a few ideas: 1. increase settling time, 2. decrease discharge pressure, 3. design a riser at the discharge
Simple drawing is attached.
 
Regards,
]]></description>
<pubDate>Wed, 19 Mar 2025 21:20:28 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32390-minimize-particles-carryover-in-reduction-autoclave/</guid>
</item>
<item>
<title>Alkaline Electrolytic Cell/stack Sizing/design For H2 Production</title>
<link>https://www.cheresources.com/invision/topic/32384-alkaline-electrolytic-cellstack-sizingdesign-for-h2-production/</link>
<description><![CDATA[Dear all,
Can anyone suggest some resource that explains the Alkaline electrolytic cell/stack Sizing/design for H2 production. could be book, tutorials, videos,.......etc. 
Many Thanks in advance.
]]></description>
<pubDate>Thu, 13 Mar 2025 15:08:23 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32384-alkaline-electrolytic-cellstack-sizingdesign-for-h2-production/</guid>
</item>
<item>
<title>Multiport Selector Valve (Msv)</title>
<link>https://www.cheresources.com/invision/topic/32383-multiport-selector-valve-msv/</link>
<description><![CDATA[Dear engineers, We are in the FEED stage of designing a facility to produce 50 KBOPD. We have 6 well pads to achieve this production. Each well pad is with an oil gathering manifold. The consultant recommends the manifolds be provided with a multiport selector valves, comprising a housing with many production inlets, allowing for the diversion and testing of fluid from any individual line through a rotating plug, while the remaining lines continue to flow to a common group outlet instead using a conventional manifolds, which includes separate production and test headers. The justification of Consultant for using multiport selector valves is that they require less space, reduce manual operation and human error In all our facilities, we use a conventional manifold instead of a multiselector manifold since our current and future facilities are onshore ones and we have space so there is no issue with it Is there anyone here with experience in multiport selector valves? and Which manifold is preferred and has better availability? is it coventional or multiselector one If you could provide me with documents explaining these valves, because I have been looking for documents about them and I have not been finding any information, only simple product bulletins. Thank you in advance.]]></description>
<pubDate>Wed, 12 Mar 2025 08:43:00 +0000</pubDate>
<guid isPermaLink="false">https://www.cheresources.com/invision/topic/32383-multiport-selector-valve-msv/</guid>
</item>
</channel>
</rss>

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