Hello,

I want to start a discussion.

In which case do you model an "anchor" as ANC and in which case do you model it as X,Y,Z?

The point of vue depends from person to person.

Kind regards,

Yke,

Hello Yke,

This is saravanan from india.

I think you are asking at nozzle point which is connecting to pipe.

Upto my knowledge, i have used y,z, and Rx,Ry,Rz instaed of anchor since in x direction radial expansion of equipment is considered.

check displacement at anchor point for radial expansion.

When considering a support / restraint, an 'anchor' resists translation and rotation in all planes. This is very difficult to achieve at a single attachment point, and is practically impossible in larger pipe sizes. The X,Y,Z restraint should correctly be called a support, line-stop and guide in my opinion.

A pipe attached to a rigid item such as a pump casing or a compressor can reasonably be considered as 'anchored', provided it is actually at the fixed point, so that casing expansion is allowed to occur.

It's true that definitions vary from company to company etc, but it is also dangerous and should always be clarified. I have witnessed cases, for example, where every support was called an 'anchor' by someone unfamiliar with petrochem industry terminology.

this should a problem how to define freedom degree.

normally six freedom degree is enough to simulate the restrain.
sometime even more than 18 freedom is necessary.

it is really a difficulty isuue and depend on personal knowledge.

but in CII, 6 freedom degree is a common.

18 freedom ??? So far as Caesar II is concerned, since it uses beam theory, fixing of six degrees of freedom, X,Y,Z, RX, RY, RZ is all it takes to fully restrain a point against all translations and rotations. What would the other 12 do ??

Either way the question raised concerned the definition of an anchor and a translational restraint and differences therein.

I don't think it is a difficult issue at all, just one that needs clarity.