Dear all,
In one of our plants, we have 24" line with design temperature of -45 °C. The line has cold insulation of 90mm and has clamped shoes on the top of insulation. Due to line movement, support shoes have displaced . In my opinion, it is not cause of concern. The length of the shoe is 400mm and beam width is 300mm. The displacement is such that the centre of the shoe is still on the beam. More of the shoe length that is around 280mm is on the structural beam in most cases. Only 120mm has moved out of structural beam which looks odd to many operators. I have modeled the line in CAESAR II and the stresses of the line are will within limits. Displacements are as is the actual scenario in the field. The line has moved in such a way that it is almost touching the nearby lines at the expansion loops. But it is not pushing them.



So:

1) Is this displacement any cause of concern. Should I ask to lengthen the shoe?

2) Any criterion for displacement that I can refer and include in my report.

3) Any other idea?