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Eng-Tips’s functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. At the moment I work in plant design Process Engineer. It is now desired to do this analysis in-house.
I’ve taken it upon myself to research this. I know that Caesar, Autopipe and others are used, but for various reasons they don’t want to go this route. Instead they want to establish either a guideline or program that will cover the stress analysis. We can characterise out piping networks quite easily, in terms of fittings, equipments dimensions, operating conditions etc. So what I’m really looking for is somebody that works at this day to day, to give some pointers.
I would like to get some other opinions on this. If it really is a bad idea, its best to find out at this early stage. From reading the guides, a lot of it seems pretty vague, or at least up to the designers dicretion. I’m assuming for all this that ASME B31. 3 is the main guideline to consider regarding Stress Analysis for Process Piping. I’m thinking you could be right. What it really boils down to though is that noone here has dealt with stress analysis before.
I asked why not go with Caesar and was told the cost was prohibitive. What I’m looking for is a way for us to do Stress Analysis. The method isn’t too important, only the end result. What’s involved in using the software and in Stress Analysis overall. I don’t mind getting stuck into the deep and dark calculations in the guides but if it can be avoided then all the better. You will also get some replies from folks who are members of various Piping and Pressure Vessel Code Committees.
ALSO, you have apparently done some research via looking up previous applicable threads – THANK YOU! I do not think the Guide Books by Glynn Woods and Chuck Becht are very vague – I think they are really rather explicit. However, the Piping Codes do not give you much in the way of design direction – that is intentional as it is not the job of the Codes to guide design. I assume that you have looked at the scope paragraphs in the Piping Codes and you have decided that B31.
Are you familiar with the B31. 3 concept of various fluid services? 3, Appendix M and paragraph 300. Most larger CPI and HPI corporations have in-house Standards that guide the design of piping systems and in many cases those standards include some guidelines for when a piping system must have a “formal” analysis. Note that the ASME Piping Codes do not require an analysis of every piping system – so in this regard hey are vague. If I did not have much experience, I would not want to develop a set of corporate piping design Standards from scratch.
Rather I would want to build on the Standards that were developed by others. I am not saying that I would suggest taking another Company’s Standards and adopt them by simply changing the company name on the cover. As I say, this will be an interesting thread. Well, I am not one for “rules of thumb” but you will find some. Thanks for that great response, plenty of things to think about in that.
My saying I found the guides vague is down more to my inexperience than anything else. I am not a piping designer, so much of the guides content is new to me. So even though we aren’t laying out the design we need to figure out how to stress analyze it. 3 seminars, I will keep my eyes open, however I’m based in Ireland where these kind of things don’t come around too often. Still where theres a will theres a way. At present, as long as they see “Approved” by the external contractor then they are happy. At the moment it seems like some dark mystery to everyone.
The LANL manual was one of the first things I came across, and perhaps I should concentrate more on practical applications like this. I really hope this will be an interesting thread. I’d like to get a discussion going among those that work with Stress Analysis day to day, since I think these are the people with that can give the best direction. Please keep the opinions coming, and if anyone can give me a rough price for Caesar also that would be great. Being able to run the software and being able to do the analysis are not always the same thing. The B31 codes require ALL pipelines to undergo a flexibility analysis, whether manual or otherwise.
The analysis may only consist of a review and opinion by an experienced person that an analysis is not needed, but every line must be looked at to one degree or another. Since you are in the UK, are you using one of the BS codes, eg BS5500? Since you asked for rules of thumb, here are a few. Others: Cast iron lines, FRP, copper, etc. Of course there are plenty of exceptions to this.