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Eng-Tips Forums - www.eng-tips.com | Site profile
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Site profile page for http://www.eng-tips.com.
This report page has aggregated and summarized the online discussions from the Message Board located at http://www.eng-tips.com.
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1) Top 10 Active Forums during Last Week
2) Top 10 Site Forums
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4) Hot Threads for Last Week
Warning: These statistics are generated using 'best efforts' and can experience delays and reporting errors at times. Please note that such statistics do not constitute a site's popularity and/or exact posting volumes at any given reporting period.
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Posting activity table on Eng-Tips Forums:
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Rating - The position measured by activity among all forum sites tracked by BoardReader.
If rating is 10 there are 9 forum sites which have higher activity.
Posts - Number of posts on forum site during last 7 days.
Threads - Number of threads on forum site active during last 7 days.
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Eng-Tips Forums posting activity graph:
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Top authors on Eng-Tips Forums during last week:
user's latest post:
Double Sheet Pile Wall/Double...
Published (2009-11-07 13:22:00)
Double-skin cofferdams and then cellular cofferdams are discussed at p.245 and following of Deep Excavations: a practical manual 2nd Edition Malcolm Puller Thomas Telford Limited 2003 A good and ample discussion of cofferdams in general but not double skin at page D4-3 and following of Standard Handbook of HEAVY CONSTRUCTION Third edition James J. O'Brien, John A. Havers, Frank W. Stubbs, Jr. McGraw Hill NY 1996 http://ww w.jfe-stee...
user's latest post:
Exist. Concrete Floor Slab
Published (2009-11-07 14:34:00)
( I don't think you can rely on the existing slab to carry the new unit. Either add a concrete curb as suggested by structuresguy or use steel framing to span between joists. , )
user's latest post:
Need help with Beam Calcs
Published (2009-11-07 22:44:00)
Your reactions are: Support 1 - 2458 lb Support 2 - 7136 lb Support 3 - 5812 lb Support 4 - 7136 lb Support 5 - 2458 lb Max.Moment is about 75,000 in-lb and occurs in sections 2 and 3.
user's latest post:
Need laptop recommendations
Published (2009-11-07 18:27:00)
You will notice a huge difference between 2001+ and 2010 in both appearance and computer resource requirements. You may also have some "sticker shock" regarding the upgrade cost. Laptop specs depends on how full your wallet is. Skip Vista and go direct to Win7. Whether you need a 64 bit system depends on your models and assys complexity and size. However, a similarly spec's x64 system will cost as much as an x32 system, but...
user's latest post:
Pump return flow overheats...
Published (2009-11-07 07:50:00)
( I hope you don't think that a VFD will help your maintenance situation. , )
user's latest post:
Rodents chewing through cables
Published (2009-11-05 14:07:00)
( http://www.mcmaster.com/#catalog/115/800/=4dgpzm Right hand side, third from top. The exact stuff I was thinking of in my first post and Mike mentioned above. , )
user's latest post:
Buying a new CMM system
Published (2009-11-07 16:08:00)
If you have time I would attend some of the shows or exhibitions like Westec early next year. i believe that the best way to evaluate a CMM is up close and personal just like buying used equipment as you are the only one that knows the application. Make sure if you purchase a refurbished one that the machine was returned to OEM specifications including any up grades that may have been missed. Here is a...
user's latest post:
Soft start motor starts in 1 hour
Published (2009-11-07 13:27:00)
( When you start the motor you put a large amount of energy into the rotor as slip losses while the motor accelerates. You should include this when evaluating the apparent savings you will make. Your control gear will be a maintenance nightmare, figure on either putting in a grossly oversized contactor or replacing it fairly frequently. Your proposal is frankly a terrible one from the electrical point of view. A motor running a pump dumping...
user's latest post:
Shear Flow
Published (2009-11-06 11:23:00)
HAHAHAHA- Classic Miecz!!
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Top 10 active forums on Eng-Tips Forums during last week:
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Top 10 forums on Eng-Tips Forums:
Structural engineering other topics
- 19,359 posts
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How to Improve Myself to Get Ahead in My Work
- 16,113 posts
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Electric power engineering
- 15,124 posts
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Electric motors & motor controls engineering
- 13,503 posts
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Mechanical engineering other topics
- 11,419 posts
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SolidWorks 3D CAD products
- 11,147 posts
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Engine & fuel engineering
- 10,154 posts
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Piping & fluid mechanics engineering
- 9,880 posts
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Metal and Metallurgy engineering
- 7,414 posts
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Where is Engineering Going In The Next 5 Years
- 7,386 posts
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Latest active threads on Eng-Tips Forums:
Started 12 hours, 22 minutes ago (2009-11-08 22:10:00)
by waross
( A basic motor??? Permanent magnet? Series? Shunt? An armature is almost a short circuit \(very low resistance\) until the motor starts spinning and starts generating aback EMF to reduce the current. , )
Started 19 hours, 39 minutes ago (2009-11-08 14:53:00)
by itsmoked
( Generally when someone goes to the bother and expense to put in a standby/backup motor this signals an exceptional need for high reliability. As such you should not consider using one VFD for both motors. A VFD has about the same chance of failure as the motor it runs. The correct setup would be two VFDs and some logic to run both motors alternately. This prevents bearing failure from non...
Started 1 day, 11 hours ago (2009-11-07 23:30:00)
by cranky108
I am guessing both gererators are rated at 120MVA. If you use a three winding transformer and it fails then you loose 240MVA of capacity. If you use two 2-winding transformers and one fails you only loose 120MVA of capacity. But the additional cost for two transformers includes an additional high side breaker, and relay control scheme.
Started 1 day, 22 hours ago (2009-11-07 12:29:00)
by slavag
Hi MIke. Sorry, I don't undertand your Q. Could you please provide more information. Actually, operation procedures are depend on primary configuration of SS and not on the voltage level. single bus for 35kV and 350kV, are same rules for switching. Best Regards. Slava
Started 3 days, 12 hours ago (2009-11-05 21:41:00)
by magoo2
The IEEE C62 series covers surge arresters. Was your question about surge arrester or surge capacitor test standards? Your title says one thing, your post another.
Started 3 days, 23 hours ago (2009-11-05 11:16:00)
by dcasto
or put the control valve down stream of the slug catcher. If the level is to high, pinch the flow out. This is better because upstream the shreading of the water/oil through the valve causes an emulsion.
Started 12 hours, 4 minutes ago (2009-11-08 22:28:00)
by MikeHalloran
( I recall a positive- drive infinitely variable bicycle transmission, announced maybe 20 years ago in the mechanical fish wrappers. I think it used radially sliding teeth on the crank sprocket, and a regular chain and hub. I don't recall ever seeing one in person. If you want us to download and read something, at least do us the courtesy of providng a link. , )
Started 10 hours, 24 minutes ago (2009-11-09 00:08:00)
by kclim
Can you take your corrosion products to an SEM and have them analysed (EDS)? That may reveal more info on the corrosion process.
Started 2 days, 20 hours ago (2009-11-06 14:18:00)
by ScottyUK
( Yes, it should definitely have been balanced. Ideally it should have had an overspeed run too. You should check that the rotor is correctly aligned and centred in the airgap too. , )
Started 6 days, 6 hours ago (2009-11-03 04:26:00)
by eyec
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Hot threads for last week on Eng-Tips Forums:
Started 4 days, 21 hours ago (2009-11-04 13:32:00)
by Ron
Horizontal shear in a beam or plate girder is mobilized by bending, so horizontal shear is not 0 at the center as would be for vertical shear. It is actually at a maximum with the maximum moment. The shear is created by the tension/compression differential in bending.
Started 5 days, 16 hours ago (2009-11-03 18:06:00)
by frv
Yes. And I did. Been here for close to a year. " Unethical" is a bit of a dangerous word to use here. Would it be more ethical for me to go on welfare in order to support my kids? You gotta do what you gotta do!
Started 1 month ago (2009-10-03 18:04:00)
by jmw
( And the temperature proxies based on tree rings? Visit Watts up with that and this article here: http://w ww.financi alpost.com /opinion/s tory.html? id=2056988 , )
Started 4 days, 18 hours ago (2009-11-04 15:51:00)
by KENAT
( From looking up cable sheath rodent protection I get: http: //www. rice lake.com/d ocs/browse .php?categ oryID=1514 h ttp://www. procentec. com/produc ts/product display.ph p?index=37 http://www.datapacksystem.com/data/draka/e11dq.pdf Surely there is a product a bit like the flexible tubing/houses often used on domestic sinks etc? Maybe you could even use that if you need to retroit....
Started 6 days, 21 hours ago (2009-11-02 12:36:00)
by msquared48
( I assume that you are talking fresh water here? , )
Started 5 days, 12 hours ago (2009-11-03 21:42:00)
by edison123
( The product of eff x pf does seem a bit low. What is the speed of the motor ? Typically, both of these nos. drop with speed. , )
Started 1 month ago (2009-10-05 15:49:00)
by PLukacovic
Seems to me like they are using the economy's poor condition to take advantage of their workers. You should not have to go insane working 60 hour weeks just to ensure that you have a job in the future. It seems like management is willing to have you work long hours so that they can ensure themselves of a future job. It's not worth the stree, in my option. Dust off the resume and see where ...
Started 6 days, 23 hours ago (2009-11-02 11:29:00)
by MintJulep
How many lines connect to the master cylinder?
Started 6 days, 19 hours ago (2009-11-02 15:15:00)
by metengr
htlyst; Before venturing out on this type of journey, what are the design pressure and vessel contents?
Started 6 days, 5 hours ago (2009-11-03 04:44:00)
by patprimmer
( An anonymous complaint is a complaint from no one. If I get them I promptly deposit them in the round file. , )
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