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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
3) Latest Active Threads
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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Month
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3 Months
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Threads:
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1,294
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4,467
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12,572
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Post:
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3,691
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12,430
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34,143
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Put this code anywhere on your forum page:
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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.
Authors - Number of authors which contributed to the site within last 7 days.
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Eng-Tips Forums posting activity graph:
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http://www.eng-tips.com Alexa graph:
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Top authors on Eng-Tips Forums during last week:
user's latest post:
Plug valves
Published (2009-11-20 16:07:00)
( The large pressure drop makes them ideal for throttling and blowdown apps. , )
user's latest post:
Nut Bearing Surface Area
Published (2009-11-20 19:37:00)
Hi nctexan22 I am a little confused by your post however this is what I was trying to convey:- Yes your pre-loaded bolts should have a higher load then the external load exerted on top flange of the valve bonnet which you seem to have according to your spread sheet. Now your concern I thought was the reduced area under the nut face as it may cause the clamped material to yield so you simply divide your reduced area of clamped material into...
user's latest post:
capacity check - shear links
Published (2009-11-20 16:20:00)
Also, if a shear field was of order, the skin reinforcement would be counted.
user's latest post:
Wood Truss repair
Published (2009-11-20 16:48:00)
( Add the original diagonals and verticals. With the bolts, you might need to go to 2X6 material. Check it thoroughly. Using the 3/8" plywood could make the truss stiffer than the ones to either side, causing an unsightly read at the roof. , )
user's latest post:
Wood Truss repair
Published (2009-11-20 20:41:00)
( I agree with MiketheEngineer. I have done the same thing upon occasion. Bolts are not a good idea on 2x4 chord members because they tend to split the chords. 1/4" gusset plates are overkill. Light gauge \(20 ga. or 16 ga.\) steel plates with pre-drilled holes and screws or nails would be another option, but I still prefer Mike's solution using plywood gussets, glue and nails...
user's latest post:
When to move on?
Published (2009-11-20 20:25:00)
SEIT...Moonlighting should wait until you are licensed. I have no doubt you'll nail the exam....take the general PE or SE1 first...you can always do the full Structural later...just get licensed...then you have a marketable attribute that doesn't require significant discussion or selling. When you decide to moonlight, you have to tell your employer. If they do not allow moonlighting, then you have to decide...give...
user's latest post:
Searching for an OLD German...
Published (2009-11-20 23:45:00)
Here is another database, Metal Data http://www.metaldata.info/eng/sinquiry.php
user's latest post:
L*di/dt
Published (2009-11-20 05:05:00)
( It makes porfict sense. Look, if dt gets smaller V gets bigger. This is exactly what does happen! If di gets bigger V gets bigger. Again it makes sense. , )
user's latest post:
NACE RP0475 - Produced Water...
Published (2009-11-20 23:34:00)
Does anyone know why NACE withdrew RP0475? Is there another similar standard out there (i.e., ISO) or is there no current accepted industry standard for these systems?
user's latest post:
MV 400 HP VFd alternatives
Published (2009-11-20 15:53:00)
( Hi jraef. Thanks for the information. On the skids that I was looking at either a filter or a transformer was used, but not both. The transformer was rated for VFD duty. For what it's worth, the filters were about the same physical size as the transformers. , )
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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
- 20,139 posts
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How to Improve Myself to Get Ahead in My Work
- 16,293 posts
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Electric power engineering
- 15,626 posts
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Electric motors & motor controls engineering
- 13,802 posts
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Mechanical engineering other topics
- 11,627 posts
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SolidWorks 3D CAD products
- 11,497 posts
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Engine & fuel engineering
- 10,225 posts
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Piping & fluid mechanics engineering
- 10,174 posts
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Electrical/Electronic engineering other topics
- 7,673 posts
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Boiler and Pressure Vessel engineering
- 7,513 posts
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Latest active threads on Eng-Tips Forums:
Started 6 days, 1 hour ago (2009-11-16 11:09:00)
by jmw
( The article is a very illuminating read, especially if you follow the links. Hollands 19% wind energy actually translates to around 1.3% but when quoting wind energy capacity we have to be very aware of what they actually mean. "Capacity" seems to mean the rating of the turbine not what you actually get from it and if, as the Dutch found, you get it at the wrong time, you end up selling you ...
Started 2 days, 7 hours ago (2009-11-20 05:25:00)
by BigInch
( That looks like enough water flow in such a small line to keep the pipe clean and fresh w/o a circulating loop, provided the line is not too long. It might be nice if the line diameter could also be sized so that you have a complete volume change every hour or some similar "reasonable" criteria. , )
Started 1 day, 9 hours ago (2009-11-21 03:04:00)
by slavag
Hi Jay27. According to your explanation, "problem" is your injection current. Try change setting of harmonic restraint and not pick-up value of diff current. Please meas level of harmonics in the injection current with some analaizer. Good Luck. Slava
Started 2 days, 17 hours ago (2009-11-19 18:47:00)
by davidbeach
Will the saturation cause the relay to fail to operate? Doesn't matter how saturated if the relay still does its job. Why do you need to see load with your protection CT? Why does the relay care if the circuit is open? Since maximum fault current is about 4800 times load current you won't ever do a good job of measuring load and responding to faults with a single iron core CT. Perhaps this...
Started 2 days, 21 hours ago (2009-11-19 14:48:00)
by dpc
Never heard of VFD rentals. Just keep in mind that even if you increase the speed, it's still only a 350 hp motor.
Started 1 day, 9 hours ago (2009-11-21 02:34:00)
by Skogsgurra
( You didn't say that the motor is fed from a frequency inverter. But I put one thousand dollars on the table and say it is. If it isn't, you can take the money. PWM inverters emit powerful HF noise and that is what your AM radios are picking up. NEC doesn't have anything with HF pollution to do, FCC has. So, you have to apply other knowledge than power electrical to this. A power analyzer ...
Started 1 day, 10 hours ago (2009-11-21 02:04:00)
by transmissiontowers
( There is not much consideration given to the deflection under load for Distribution class wood poles. The Distribution guys have a 60' exemption in NESC where hurricane or extreme wind from rule 250C does not blow below 60 feet. From a physics standpoint, this is incredibly wrong and the only way they justify the practice is to point out the debris blown around by extreme wind catches on the...
Started 1 week, 1 day ago (2009-11-13 22:52:00)
by jberg
( I am not sure about other structural engineering companies, but the company I work for has been on 32 hour workweeks since April. Many of the structural engineering companies in the area have the same issues. I am now back full-time \(40+ hours per week\), but that is only because I am working on a project with a short time frame. In April, I passed the PE and I have not received a raise ...
Started 2 days, 9 hours ago (2009-11-20 02:37:00)
by ajack1
Well the masters should give long term benefits and the overtime short term. Would the amount of extra money from the overtime and redundancy be enough for you to pay for the degree that you say the company are paying for and give you enough time to complete the masters with no other distractions? I guess it boils down to what you think the job market will be like in 12 months time.
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Hot threads for last week on Eng-Tips Forums:
Started 2 weeks, 3 days 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 1 week, 1 day ago (2009-11-13 14:01:00)
by BigInch
( You'll find a few suggestions here, http://www.expertctr.com/ch_5.php , )
Started 3 days, 22 hours ago (2009-11-18 14:03:00)
by desertfox
hi Kootenay Kid Well I don't know what load your putting on but I wouldn't want to be any where near it, It looks like your sliding a flat bar into a box section if my understanding is correct and if thats the case I have a question:- How do you weld something thats labelled 10mm ring 200mm down inside another box section? desertfox
Started 1 week, 2 days ago (2009-11-13 09:17:00)
by dik
I'm not familiar with the soil, but if it is highly plastic, then the slab could have dessicated and caused shrinkage. Jointing is a problem with water; if left open you can get something called 'pumping' in these locales. The saturated soil has a reduced shear capacity, hence, a reduced bearing capacity. How thick is the slab; it might be underdesigned for the applied loadings. Dik
Started 1 week, 1 day ago (2009-11-13 22:52:00)
by jberg
( I am not sure about other structural engineering companies, but the company I work for has been on 32 hour workweeks since April. Many of the structural engineering companies in the area have the same issues. I am now back full-time \(40+ hours per week\), but that is only because I am working on a project with a short time frame. In April, I passed the PE and I have not received a raise ...
Started 5 days, 2 hours ago (2009-11-17 10:13:00)
by DaveAtkins
( Well, the simple answer is K = 1 and L = 100'. And that is what I use for design for this situation. Yes, I know that only the lower 15' of the column has compression, but the entire 100' length of column can buckle. , )
Started 1 week, 4 days ago (2009-11-11 07:25:00)
by tygerdawg
( Jobs come & go, your family should always be first in my opinion. It's a noble thing to make accommodations and sacrifices for your family. If my experience is any indicator, it will work out. It's a sad state of affairs when people judge their success on how much money & prestige they have, and not by the rich environment they have created at home. Expect to be required to repay some or ...
Started 1 week ago (2009-11-14 19:35:00)
by waross
( The easiest way is to go to droop mode on the generators. Why can't you sync the bus to the utility with one generator and then add the others? , )
Started 6 days, 1 hour ago (2009-11-16 11:09:00)
by jmw
( The article is a very illuminating read, especially if you follow the links. Hollands 19% wind energy actually translates to around 1.3% but when quoting wind energy capacity we have to be very aware of what they actually mean. "Capacity" seems to mean the rating of the turbine not what you actually get from it and if, as the Dutch found, you get it at the wrong time, you end up selling you ...
Started 1 week, 2 days ago (2009-11-12 21:27:00)
by frv
As,min is just that. A minimum. If you need more, use more. I fail to see the big issue. If I had to make an educated guess, I'd say that the As, min based on the web width is just for the beam; you'd still have to satisfy the minimum reinforcement for the slab that's acting as a T beam.
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