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Pipe Radial Growth in Thermal condition

Pipe Radial Growth in Thermal condition

Pipe Radial Growth in Thermal condition

(OP)
Hi friends,
A guide support is provided in a 600NB horizontal Pipe under 500 deg C. The guide support is Zero mm gap in lateral direction & axially free movement. But the Support Clamp ID is match with pipe OD.
I have a doubt, due to larger pipe size, the radial movement is significant. So, in that case how we can take care this radial growth while designing support clamp inside diameter.

RE: Pipe Radial Growth in Thermal condition

Sundham,
Post a sketch of the guide. A picture is worth a thousand words.

RE: Pipe Radial Growth in Thermal condition

Sundham,
Forgot to add. There are many piping engineers whom do not consider radial growth of a large bore pipe at temperature at guide locations and the increased gaps required to cater for thermal radial growth. I've come across this situation many times - standard gaps specified which are no good for large bore high temperature lines.

RE: Pipe Radial Growth in Thermal condition

I do not see it as an issue because the Pipe Clamp is in full contact with the surface of the pipe they will both at or very near the same temperature so there is no real drastic differential growth.

prognosis: Lead or Lag

RE: Pipe Radial Growth in Thermal condition

In the real world (dirt, paint, scale, rust, rough surfaces, no lubricant between pipe and clamp, diameter tolerances of pipe OD and clamp ID, etc.), designed like that sketch with a "pipe support" literally clamped to the pipe's outside surface over a 240 degree arc, you WILL "clamp" the pipe with the pipe support.

There won't be any axial movement between the pipe clamp and the pipe under either temperature changes or water hammer/vinration. When the pipe moves from thermal growth, the pipe clamp will be dragged along (axially) and pushed sideways, moving across those lower supports until the two stops are hit.

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