Re: Dyanamic analysis

>I am looking to start the Dynamic analysis of piping system with
> centrifugal pump and another piping system with surge and wind loads. Can
> any one help me in giving the idea how to start off with initial
> assumptions and data.

I don't know exactly what a surge load is, probably I know it by another name. Wind loading is defined by the construction specification, which you know by heart before you get started with any kind of analysis.

>To set the frequencies and which type of dynamic analysis
> suits whic applications etc.

If you're talking about natural frequencies. ou don't 'set' them. Frequencies are properties of the system and are calculated.

>group may find this question as very basic one, but expereinced ones knowledge
> will help other one and that's how the groups objective is met.

I'm going to risk sounding crabby, here, but I've been in the biz for about 40 years and I figure I've paid my dues. Unless you've done some of this or had some formal instruction in stress analysis, you probably shouldn't be doing this kind of work, since it doesn't sound like you know enough to begin, let alone determine if your analysis is correct.

Dynamics is not kid stuff--it's non-intuitive and it's tricky and it's difficult to validate. If you're depending on the software to do your engineering for you and figure out if you have the right answer, you're headed for big trouble. I've seen it a hundred times, not counting all the times I've seen the symptoms on this list. Do some study, learn your basic mechanics, and find someone who knows dynamics to provide you some leadership. Read the stress analysis portion of the engineering specification. Find several systems that have been subject to dynamics analysis, and practice coding up the system on those, so you'll know what answers to look for and what mistakes to avoid. aReadn the engineering specification to learn what answers you need to provide. If you don't understand the specification, you may be in over your head and the answers you provide may not address the issues that need to be addressed. That could cost your employer money or even lives.

Let me quibble about one other thing. The 'group's objective' is exchanging information between peers (Right, Paul?), not to provide free basic education or engineering support. The analysis is your responsibility. There's a lot of advice available here, but like all free advice, it isn't going to subsitute for an understanding of engineering first principles. Most of all it isn't going to help you keep your job or your reputation if you screw up. Do your homework--if you have specific questions, by all means put them to the list, but realize you need to know a lot of things to eveluate the applicability of anything you read here. And never forget that you're the guy in the barrel when something doesn't work.

Christopher Wright P.E.    |"They couldn't hit an elephant at
chrisw@skypoint.com        | this distance"   (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)