Axial Expansion Joint
Axial Expansion Joint
(OP)
Hi
As I know and EJMA mentions, axial expansion joints should not use in lines with offset. But In some projects I saw this kind of installation for axial expansion joints. Am I wrong in understanding of EJs installation?
As I know and EJMA mentions, axial expansion joints should not use in lines with offset. But In some projects I saw this kind of installation for axial expansion joints. Am I wrong in understanding of EJs installation?





RE: Axial Expansion Joint
That said, the words 'expansion joint' and 'offset' are enough to send a chill down the spine of every older generation piping engineer. It is precisely the cause of the Flixborough disaster which killed (I think) 29 persons on site and destroyed and entire chemical complex.
As I recommended on another post today, just google 'Flixborough' for some sobering facts.
RE: Axial Expansion Joint
See attached file. In the attached file there is a rubber expansion joint with limit rods(axial expansion joint) that is installed in a line with a offset or similar installation. But as we know this installation is not correct. What is the reason for the installation?
RE: Axial Expansion Joint
The installation is clearly low pressure, probably water. The pump type is not susceptible to misalignment due to pipe loads and if it's water, there will be no expansion problems.
It is common in water applications to place a rubber joint such as shown (usually with tie-bars) on pumps to limit noise transmission and to allow for a certain amount of misalignment.
RE: Axial Expansion Joint
RE: Axial Expansion Joint
Actual allowed lateral movement would be available from the vendor.