Dear All,

Please help me in the following topics,
1. What are the important criterias to be considered while doing stress analysis of piping connected to reboiler.
2. what is the Datum Point in the compressor piping stress analysis to resolve the forces and moments.

Please reply ASAP.

Thanks in advance.

Regards,
PDSE

1. Most important criteria, if in doubt ask. But ask your boss, not this forum. Your question is too broad.

2. Datum point should always be confirmed with the compressor vendor, varies with machine type and number of nozzles.

Dear MoverZ,

Thanks for your reply.

But no one is here to guide me.

Please explain these topics atleast in brief.(If possible with examples)


Thanking You.

Regards,
PDSE

You cannot learn stress from this forum. Employ someone with relevant experience, otherwise you will probably engineer a fatal accident.

hi,
PDSE,
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Here is quick look to compressor analysis FYI:

1- Calculate mechanical natural frequencies of piping system.
2- Calculate acoustic natural frequencies of piping system for any anticipated gas conditions.
3- Calculate compressor harmonics (RPM/60 times N, N=1,2,3,...,10)
4- There must be 10% to 20% seperation between above frequencies.

These may eliminate resonance. But the following analysis must be done by compressor's vendor as min. requirements.

1- Above mentioned frequency calculations.
2- Pulsation analysis (API 618).
3- Harmonic shaking force analysis (by CAESAR II).

Please note that the accurate CAESAR II model must be use to calculate natural frequencies. All piping branches, steel structure pipe supports, etc. must be modeled carefully.
I've done a couple of compressor piping vibration jobs by using BOS Fluids and CAESAR II, but you should have a good experience in CAESAR II dynamic analysis as well.

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Kindly send me the file on my email:

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Y'hello Nitin, could you please send me same document, awbarlo@yahoo.com
Thanx in anticipation..

Dear Farhad:

As for the analysis you mensioned for compressor lines, canyou help give some example?

Now I encounter a big vibration trouble for the inlet of one cpmpressor.
The vibration source isn't clear except I am sure the machine vibration is acceptable.
The source may be valve , flow flush, if I want to know this source, waht should I do?

thanks very much!

Dear friend,

Most of vibration problems are due to improper surge drum sizing. In this case shaking forces develope in piping sections and cause fatigue failure in pipe supports and pipe attachments with excess vibration.
Normally, compressor's vendor must check your piping routes and size surge drums accordingly. After a few years operation usually, pipes start vibrating due to gas property or compressor working condition changes.
At this time you should contact vendor again and they perform pulsation analysis for new operation conditions then they will give you the fix.
Or you can consult with an expert. It's not that easy to put new or reinforce pipe supports to solve this problem. You must find the origin of vibration then give a solution. Definitely, the first step is pulsation analysis.

Hi nitin!!

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Moderators, can you delete this post, I find that these chains of requests for documents at the least clutter the forum and may be breaching copyrights as well.