Jacketed Piping

[Haithem Turki]

I modeled a jacket pipe (a 100 m Straight header), this model need anchor with connecting node (Core Pipe/Jacket Pipe) in each Flange
The problem is the effort in the fix point (Fix Support), I find that this load is to huge for a pipe DN400/500.
the load is approximately 28 Tonnes in the longitudinal direction.
Any one know this problem , and it's solution ?

 

[XL83NL]

Hi Haithem, could you maybe specify more details, such as a picture with routing? Which (pipe stress) program do you use to model the situation?

 

[Haithem Turki]

Hello XL83NL

I use CAESAR II, here's a picture of the model.
The fixed point is signaled with yellow.

Thanks in advance .

 

[LittleInch]

Needs a section drawing of the joint to understand.

However locking in a differential expansion every 12m will give high forces. What sort of DT do you have?

surely the next pipe reacts against the joint in an equal but opposite manner?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[Haithem Turki]

The problem is that this huge effort doesn't come from temperature effect, although the elevated temperature of this application 160 °C. But it comes from seismic effect in the routing direction of the header .

 

[LittleInch]

Ok, so are you saying it is the force between the inner pipe and the outer pipe because the inner pipe is seeing accelerations due to seismic shaking??

what's the issue with the force?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[KevinNZ]

A sketch of the long section of the two pipes would be useful. Do you have expansion bellows to account differential expansion?

As LittleInch says The EQ load on the inner pipe needs to be transferred to the ground some how. The force path is from the inner pipe to the outer pipe. The connection between the inner and other pipe will see the EQ loads on the inner pipe.

Note the contents load of the outer pipe does not need to included the fluid in the inner pipe, only the fluid in the annulus. Your model maybe including the weight of fluid in the inner pipe twice.

 

[Haithem Turki]

LittleInch ,

This effort is in the support which support the outer pipe ( type support Fix Point ),and i this huge effort ( 28 Tonnes in the logitudinal direction)is the effect of the seismic on the inner and the outer pipe .

 

[Haithem Turki]

KevinNZ,

I don't have an expansion bellows .

[highlight #FCE94F]As LittleInch says The EQ load on the inner pipe needs to be transferred to the ground some how. The force path is from the inner pipe to the outer pipe. The connection between the inner and other pipe will see the EQ loads on the inner pipe.

Note the contents load of the outer pipe does not need to included the fluid in the inner pipe, only the fluid in the annulus. Your model maybe including the weight of fluid in the inner pipe twice.[/highlight]

The contents of the outer pipe is vapor it dosen't have huge weight . Also the problem it's in the joint between the inner and the outer pipe,it's in the support wihch support the outer one as i already said .