pipe flexibility analysis

Hi one & all. I have a confuse in pipe flexibility analysis
Let me explain ple
When its rrequired?
If any manual calculation?.

waiting
Raj

Analysis is required per the governing authority's laws or regulations or the owner's specifications. Oftentimes, the decision is rendered by the engineering group's specifications.

In short, it's required whenever the piping is expected to fail due to the conditions that are applied to it. Many charts exist to rank conditions by which piping is likely to fail.

The only manual calculations I'm cognizant of are done via M.W. Kellogg's design manual, but I'm not aware of anyone who performs these in current practice.

Pipe Flexibility Analysis are mostly developed from EPC Contractor's standard practices and Client's standard practices combined with the local regulatory requirements. Mostly it is being classified by size, temperature,connecting equipment,etc.

I think with the availability of stress analysis softwares such as Caesar II, it's much faster to do a quick modelling than doing manual calculation. But only those that fall under critical lines will be formally documented in a stress report.

But of course, I would still advice the newbies in stress analysis to know the basics and foundations of flexibility analysis (by doing some manual calculation and comparing results with software) to develop more the analytical thinking.

A good reference which I would suggest is "Matrix Analysis of Structures". From here, you will have an idea how beam element software such as Caesar was developed by automatic computation of large number of equations stored in matrices.

With the computing power nowadays, Finite Element Technology is now becoming common. But, a hand calculation to validate results is still a must.

Cheers!!!

By Annex Q, EN 13480-3 contains some rules for simplified stress analysis (routing guideline). Annex Q originated from a German proposal and contains a calculation method for determining the permissible length between supports, as well as a flexibility check. The calculation methods correspond to the procedure as defined in TRR 100 and in AD 2000-Merkblatt (HP 100R).