<?xml version="1.0" encoding="UTF-8"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/"><channel><title>CR4 - Recent Forum Threads and Blog Entries</title><link>https&#x3a;&#x2f;&#x2f;cr4.globalspec.com</link><description><![CDATA[Recent content from CR4, The Engineer&#x27;s Place for News and Discussion]]></description><copyright>Copyright 2026</copyright><pubDate>Fri, 17 Jul 2026 09:55:45 EST</pubDate><generator>https&#x3a;&#x2f;&#x2f;cr4.globalspec.com</generator><item><title><![CDATA[How Much Structural Headroom Should Colocation Data Centers Allow for AI&#x3f;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151605&#x2f;How-Much-Structural-Headroom-Should-Colocation-Data-Centers-Allow-for-AI&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[I have been looking into how AI workloads are affecting data center design, and one question keeps coming up around structural capacity in colocation buildings.&#xa;&#xa;For a long time, structural design assumptions were relatively stable. Most facilities were built around similar rack densities and coolin]]></description><pubDate>Fri, 17 Jul 2026 09&#x3a;55&#x3a;45 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151605&#x2f;How-Much-Structural-Headroom-Should-Colocation-Data-Centers-Allow-for-AI]]></guid><dc:creator>gbcengineers</dc:creator><dc:subject>General Discussion</dc:subject></item><item><title><![CDATA[Piping Max Design Temperature Based on Ambient Conditions]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151604&#x2f;Piping-Max-Design-Temperature-Based-on-Ambient-Conditions&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[A large proportion of the piping systems I have viewed recently have ambient temperature as the max thermal condition.&#xa;&#xa;Considering the recent severe climate changes we are experiencing in the UK, it seems 40C is not to far off as an air temperature and looking at Europe&#x27;s experiences, higher 40&#x27;s a]]></description><pubDate>Wed, 15 Jul 2026 15&#x3a;23&#x3a;47 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151604&#x2f;Piping-Max-Design-Temperature-Based-on-Ambient-Conditions]]></guid><dc:creator>Screedie</dc:creator><dc:subject>General Discussion</dc:subject></item><item><title><![CDATA[How Does a Shrink Wrapping Machine Improve Packaging Efficiency&#x3f;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151603&#x2f;How-Does-a-Shrink-Wrapping-Machine-Improve-Packaging-Efficiency&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[Many manufacturers are switching to automated packaging systems. What are the main benefits of using a shrink wrapping machine compared to manual packaging&#x3f; I&#x27;d like to learn about productivity improvements, packaging quality, and cost savings.]]></description><pubDate>Tue, 14 Jul 2026 09&#x3a;58&#x3a;39 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151603&#x2f;How-Does-a-Shrink-Wrapping-Machine-Improve-Packaging-Efficiency]]></guid><dc:creator>AmarPack Machines Pvt Ltd</dc:creator><dc:subject>Manufacturing</dc:subject></item><item><title><![CDATA[Paradigm Shift on Substation Protection]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151602&#x2f;Paradigm-Shift-on-Substation-Protection&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[good day everyone, it&#x27;s been quite a long time since i got back here. i ask apologies from the active members and masters here. anyways the question as follows&#x3a; our existing practice in our company was to use the conventional charging system for a substation protection dc supply- battery bank plus c]]></description><pubDate>Tue, 14 Jul 2026 02&#x3a;27&#x3a;34 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151602&#x2f;Paradigm-Shift-on-Substation-Protection]]></guid><dc:creator>Rockraiden21</dc:creator><dc:subject>Electrical Engineering</dc:subject></item><item><title><![CDATA[Why is Titanium Added to 321 Stainless Steel Bar&#x3f; ]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151588&#x2f;Why-is-Titanium-Added-to-321-Stainless-Steel-Bar&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[Titanium is added to 321 stainless steel to improve its resistance to intergranular corrosion, especially after exposure to high temperatures. Titanium binds with carbon to form stable titanium carbides, preventing chromium carbide precipitation. This helps retain the stainless steel&#x27;s corrosion res]]></description><pubDate>Wed, 08 Jul 2026 11&#x3a;32&#x3a;14 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151588&#x2f;Why-is-Titanium-Added-to-321-Stainless-Steel-Bar]]></guid><dc:creator>Ankit Solanki</dc:creator><dc:subject>Manufacturing</dc:subject></item><item><title><![CDATA[What Usually Makes a PUE Below 1.2 Difficult to Achieve&#x3f;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151585&#x2f;What-Usually-Makes-a-PUE-Below-1-2-Difficult-to-Achieve&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[A PUE below 1.2 is possible, but I would be careful about treating it as a target that can be achieved simply by selecting more efficient cooling equipment.&#xa;&#xa;In practice, PUE is the result of several systems working together. Climate, airflow, power losses, redundancy and actual IT utilisation can a]]></description><pubDate>Wed, 08 Jul 2026 04&#x3a;24&#x3a;18 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151585&#x2f;What-Usually-Makes-a-PUE-Below-1-2-Difficult-to-Achieve]]></guid><dc:creator>gbcengineers</dc:creator><dc:subject>General Discussion</dc:subject></item><item><title><![CDATA[Equivalent Stress in Structure During Resonance&#x3f;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151583&#x2f;Equivalent-Stress-in-Structure-During-Resonance&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[Is it possible to estimate or to get input for stress calculation for instance in exhaust system during it&#x27;s resonance behaviour. Then you have to create calculation of structural deformation in this frequency point. I have developed calculation method based on OVA measurement when in certain orders]]></description><pubDate>Sat, 04 Jul 2026 03&#x3a;05&#x3a;51 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151583&#x2f;Equivalent-Stress-in-Structure-During-Resonance]]></guid><dc:creator>Reino Eskelinen</dc:creator><dc:subject>Aerospace</dc:subject></item><item><title><![CDATA[API 579 Part 4 GML Assessment - Level 1 vs Level 2&#x3a; When to Move Up]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151581&#x2f;API-579-Part-4-GML-Assessment-Level-1-vs-Level-2-When-to-Move-Up&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[General metal loss &#x28;GML&#x29; is the most frequently encountered damage mode in piping and pressure vessel inspection programmes. API 579-1 Part 4 provides the formal assessment path. The distinction between Level 1 and Level 2 is not simply about precision - it is about what inspection data you have and]]></description><pubDate>Wed, 01 Jul 2026 11&#x3a;32&#x3a;26 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151581&#x2f;API-579-Part-4-GML-Assessment-Level-1-vs-Level-2-When-to-Move-Up]]></guid><dc:creator>ShantanuANZ</dc:creator><dc:subject>General Discussion</dc:subject></item><item><title><![CDATA[Important Things About 440A Round Bars Stainless Steel in the Real World]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151580&#x2f;Important-Things-About-440A-Round-Bars-Stainless-Steel-in-the-Real-World&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[I learned that the operating environment, surface finish, mechanical loading, and maintenance can affect how quickly a material wears or corrodes. Nevertheless, I am eager to hear from individuals who have had the opportunity to work with Stainless Steel 440A Round Bars.&#xa;In your experience&#x3a; What is]]></description><pubDate>Wed, 01 Jul 2026 05&#x3a;48&#x3a;27 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151580&#x2f;Important-Things-About-440A-Round-Bars-Stainless-Steel-in-the-Real-World]]></guid><dc:creator>kailashmittal</dc:creator><dc:subject>General Discussion</dc:subject></item><item><title><![CDATA[HV Switchgear - Internal Earth Bar]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151579&#x2f;HV-Switchgear-Internal-Earth-Bar&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[HV Switchgear &#x28;IEC 62271-1, 62271-200&#x29;&#x3a; The size of the internal earth bus &#x28;the bar running through the entire switchgear lineup&#x29; differs from the size indicated in the type test report. Is this acceptable&#x3f; Is the busbar size specified in the type test report applicable only to the main busbars and]]></description><pubDate>Mon, 29 Jun 2026 11&#x3a;06&#x3a;40 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;thread&#x2f;151579&#x2f;HV-Switchgear-Internal-Earth-Bar]]></guid><dc:creator>Anonymous Poster</dc:creator><dc:subject>Electrical Engineering</dc:subject></item><item><title><![CDATA[Friendly Wager &#x28;July 2026 Challenge Question&#x29;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;blogentry&#x2f;30541&#x2f;Friendly-Wager-July-2026-Challenge-Question&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[Your friend makes a &#x24;250 bet with you.&#xa;&#xa;He will pick a number between 1 and 1,000. If you can guess this number in 10 or less questions or guesses, you win.&#xa;&#xa;Expressed as a percent, what are your odds of winning the &#x24;250&#x3f;]]></description><pubDate>Tue, 30 Jun 2026 04&#x3a;00&#x3a;00 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;blogentry&#x2f;30541&#x2f;Friendly-Wager-July-2026-Challenge-Question]]></guid><dc:subject>Challenge Questions</dc:subject></item><item><title><![CDATA[Sensors and Senseless &#x28;June 2026 Challenge Question&#x29;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;blogentry&#x2f;30540&#x2f;Sensors-and-Senseless-June-2026-Challenge-Question&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[Scenario&#xa;&#xa;You are the on-call engineer for a hydrogen compressor skid. The control system has five sensors arranged in a serial telemetry chain. Each sensor reports its own reading and passes all upstream readings downstream unchanged.&#xa;&#xa;If exactly one sensor is faulty, it reports an incorrect value]]></description><pubDate>Sun, 31 May 2026 04&#x3a;00&#x3a;00 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;blogentry&#x2f;30540&#x2f;Sensors-and-Senseless-June-2026-Challenge-Question]]></guid><dc:subject>Challenge Questions</dc:subject></item><item><title><![CDATA[Who Watches the Watchmen&#x3f; &#x28;May 2026 Challenge Question&#x29;]]></title><link><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;blogentry&#x2f;30539&#x2f;Who-Watches-the-Watchmen-May-2026-Challenge-Question&#x3f;from_rss&#x3d;1]]></link><description><![CDATA[My watch is 1 second slow.&#xa;&#xa;Your watch is 1.5 seconds fast.&#xa;&#xa;We both agree to stand here until the show the same time again &#x28;12 hr clock&#x29;&#xa;&#xa;Question 1&#x3a; How long will we stand here, waiting for the watches to display the same time&#x3f;&#xa;&#xa;After that we will leave. But we will meet back up when we simultaneo]]></description><pubDate>Thu, 30 Apr 2026 04&#x3a;00&#x3a;00 EST</pubDate><guid><![CDATA[https&#x3a;&#x2f;&#x2f;cr4.globalspec.com&#x2f;blogentry&#x2f;30539&#x2f;Who-Watches-the-Watchmen-May-2026-Challenge-Question]]></guid><dc:subject>Challenge Questions</dc:subject></item></channel></rss>