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I asked a question recently about how quick this pressured vessel will vent. I have attached a sketch :- Can someone show via some formula how long it will take to vent, or at lest drop half its pressure ? Thanks a lot !

Ussuri, I have found a good free spreadsheet program, Sling Pro, available from engineeringspreadsheets.co.uk that does 4 leg sling design in accordance with the major offshore codes. You select the code, then the load and apex angle then select the 3 components :- Master link assembly, wire...

I would like to know what the coefficient of friction u, and the nut factor k, is for a nut tightening on a bolt, for stainless steel, on stainless steel. I have not been able to find this value. For mild steel on mild steel, Gr 8.8 bolts :- u =0.15, and k = 0.2 If someone can clarify this...

I am a Structural Engineer, working in the offshore oil and gas industry. I am looking for a computer program that can design 4 leg slings, in accordance with the commonly used codes, in this industry. Can anyone tell me if there is such a computer program ? Thanks, Bert.

Trainguy, Revees111, and Vipe, thanks for your comments, they were all worthwhile ! I have definately learned something from this thread. Rob.

Apsix, thank you for your valuable post !!! That is indeed what I am asking ! Any shape can have a plastic neutral axis, and therefore a plastic Z value ( second moment of area ), but the question is, is it valid to use it for the case of angles.

Prex, thanks for your reply. I can see that the person that has written that small program has included the plastic nuetral axes. But this really still doesn't proove that they are permissable for use in angles. I was really wondering if the codes of practice, in the USA, or Europe, allow angles...

JAE, thanks for your reply. However, you didn't read the question properly. The question is, do angles have a plastic neutral axis, in addition to an elastic neutral axis ?

Can someone plese tell me whether an angle, i.e. a L shape has a plastic neutral axis. Because I have just used a program which gave ( second moment of areas ) Zpl,x & Zpl,y, as both equal to 0 ?

Thanks for all your comments. The reason why I am so interested is because I am writing a spreadsheet, to do AISC ASD combined bending and compression design. You have all convinced me that the ASD design has still got a very good future. my opinions are as follows :- 1) Both our steel and...

For AISC, which method, LRFD, or ASD, should one use ? I am a Structural Engineer in the oil and gas industry, in Aberdeen, Scotland, U.K. In this industry we use some of the American codes, e.g. the AISC codes. ASD is the allowable stress design. I have the 'green book', 9th edition, dated...

I have found a web site that has a great spreadsheet, for working out the section properties of a plate girder ( I, or T shapes ). The programe is top quality and very well presented. I frequently add the design sheet into my calcs. The web site is :- ( on the menu on the left side, go to...

boo1, thanks for your advice. The program in the epcserver location, is not that useful for a structural enginner, but thanks anyway. Also Xcalcs.com, seems to be down at the moment.

I am desperately looking for a combined bending and compression, column design spreadsheet, in accordance with the AISC codes. Previously someone referred me to the MITCalc website, however the spreadsheet on there is not very useful for a Structural Engineer. There must be people whom have...

In Europe, 4 leg lifting slings are designed, and certified in accordance with BS EN 13414. In the USA, when a sling manufacturer produces a sling, does he stamp on the sling, that it is certified, in accordance with a particular code ?, if so what code is it ?

Can anyone tell me where I can get a combined bending and compression steel column design spreadsheet, to AISC rules from ? If anyone has produced one, could you please give me a copy. Perhaps I have something that I could swop for it ?

PT999, and ScottishMuffin, hi ! Cast-iron was quite a common ingredient of American truss design, over 100 years ago, when most of the railways were being constructed. During this period 10's of thousands of bridges were being constructed across the US. Many of these bridges used types of...

Folks, listen to how stupid the units of length were :- 12 inches = 1 foot 3 feet = 1 yard 22 yards = 1 chain 10 chains = 1 furlong 8 furlongs = 1 mile Now tell me that the person that came out with all that wasn't taking the p--- ! By the way the British Imperial system was not exactly the...

AJUK, I agree with alot of your comments. However, I dont think that just because we order pints in a pub, that this is necessarily an indication that the litre hasn't been successful. I think the younger generation will start measuring peoples heights in meter, although I have to admit that I...

JAE, do you know where the meter comes from ? It was the ten millionth of the distance between Paris, and the North Pole, in otherwards there are 10,000km between them. Whilst it would have been more useful if it was a fraction of the diameter of the Earth e.t.c., it doesn't alter the fact that...