TechStories for 2011-05-30

Recent Questions & Answers   Star - Delta Transformer Protection By polerz in Electrical Engineering Hi guys, If I have the following configuration: - DELTA-STAR transformer 690/415V - Fuses installed (no circuit breaker or RCD) upstream of the transformer on each phase. - Transformer secondary is solidly earthed If I have an earth fault on say phase C to ground on the secondary side (ext ... more Grain Size Requirement for Tube Material By Moonby86 in Mechanical Engineering Hi all, Grain size requirement shall be required for material of stainless steel tube in ASME Sec. II? I am not sure why the requirement shall be required for any materials. So I need some help from experienced people. Please advise me. Thank you kindly Good luck Universal VCD AI machine By Jetsonraj in Mechanical Engineering Did anyone here familiar with the Universal VCD AI machines? I need some assistant in regarding the machine insertion quality. Simulink C5505 ECG By talhak in Software & Programming hi, I have C5505 EVM, and I am doing ECG implementation on it. So far I have successfully got the results of ECGs. Now I am trying to interface the Kit with the Matlab/Simulink. i achieved signals Simulink using Instrument Toolbox in simulink but the output is all noisy. i also have to diff ... more How to Move It? By G. Albert in Mechanical Engineering Hey everybody! I'm fairly new and have a desicision to make. I need to move 40lbs, vertically upwards 0.7 meters in 2.8 seconds. Here's the problem: Which is the best way to do this? I know I can use: linear motors; pneumatics; or hydraulics. I know: 1) Linear motors aren't really cut out for ... more CSEP Material By Natarajan in Mechanical Engineering hi all, I have seen a material named as CSEP in a P&ID. I searched it in net but I can't get. My assumption is Carbon steel Epoxy painted. IS it correct. This material is used in Sea water reverse osmosis system. Please clarify. Thanks in advance Fiber Optic Cable By jhunair in Electrical Engineering Dear Members I would like to ask your help regarding the above subject. How to order fiber optic cable our spec call for at least 6 fibres less than 15km for single mode this is for main fiber optic cable. Hereunder are the specs; single mode, index-gradient: 125um core diameter: 9+/-10um c ... more DC Drive, Heat Required to Kick Start By Joe Sparky in Electrical Engineering This is something that I have never come across before, a DC Drive in a Form Fill Packer driving the film feed works fine, that is until the power supply is disconnected for a period of time. We are talking about an less than than an hour power down time and then the DC Drive will not operate. I hav ... more Dimensions for Heat Conducting Material & the Temperature Gradient By nickjayr in Chemical & Material Science How can i find a heat conducting material & its dimensions(length,width) to have a temperature gradient of 150-200C. For example 350C & 200C at its ends. How the calculations are involved? Thanx for the help in advance. Screen for Sea Water Intake By clperera in Mechanical Engineering Our fire water is taken from the sea and the suction lines of 12" diameter are cabon steel with cement lining. We are replacing the submerged sections of these lines and are looking at installing a screen at the end of the pipe which is under water to prevent sand and other matter getting sucked in. ... more Engine Hour Signal on Regular Truck without EH Output By Znago in Automotive I need to connect to a Engine Hour signal on a regular truck that does not have an engine hour meter (most trucks do not). What other type of signal may be available from the (diesel) engine that I can use instead and serves the same purpose? Pneumatic vs. Hydraulic Cylinders By Jay_ in Mechanical Engineering I have asked this in the link provided below, but I figured the thread had died. I am not a mechanical engineer, so I would like some info. I want to consider the construction of the bucket loader's "arm" - like the one at construction sites. In such a case, what differences (advantages and disadva ... more Installation of Water Pipe By hien.nguyenquoc in Civil Engineering Thank you for many of your replies so far. I have been here since 2009 and I have a feel that the more I join CR4 the more my mind will expand. Thank you again for that. My question is why sometimes people (because I don't know if people usually do that) make a trench with a slopes, the wide slopes ... more Pre-Insulated Black Steel Chilled Water Underground Pipe By 786verycool in Mechanical Engineering We are using HDPE Pre-insulated black steel chilled water underground pipe in the project. The pipe joints are welded and the the insulation at the joints is field applied and the copper trace wire that comes embedded in the insulation is continued in the field at the joints by a small piece of wire ... more New Blog Entries ^ Back To Top Retail Ready vs. Sustainable posted in Packaging & Labeling How often do broad manufacturing concepts end up competing with and thwarting bottom-line business objectives? Can a systems approach harmonize the ideas that might otherwise clash? For instance, some folks view Retail Ready Packaging as opposed to efforts to reduce packaging. Do shelf-ready and ret ... more Latest Topics of Discussion ^ Back To Top Supply Generator Power to PLN By Anonymous Poster in Electrical Engineering Dear all, we have problem to control supply power from our turbine to PLN, we want that just working to supply 3 MW, but the reality we can't control that's, because the PLN just move on to take our power as their needed...and that's mean problem to my plant, because can make trip in my generator.. ... more Retired Engineers By suresh sharma in General Discussion If you are retired enginer, how you spend your time?.Do you engage yourself in fitness activity?, any social work?. Are you employed in part time job?. Normally what is your schedule.Sharing such information will help many of us. Stay Informed ^ Back To Top Product Alerts Receive email updates on new products and suppliers Newsletter Subscriptions Your source for technology news and industry information - view past issues Download the Engineering Toolbar - It's Free! The Engineering Toolbar - The Ultimate Resource for Engineering and Technical Research. Learn More Product Announcements New and featured products from manufacturers and suppliers Tools & Links ^ Back To Top Build an original machine to launch a rocket Flex your physics muscles - Take the TREB Challenge! Directory of Companies on GlobalSpec Engineering & Scientific Links Technical Articles

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