Hello Everyone,

When I use an Untied Universal expansion joint, should I add a support for the middle spool or it's somehow designed to be self supporting?

Thanks

Generally, EJ vendors consider the weight of the middle spool in the design of a universal expansion joint. The weight is often handled with bellows' stiffnesses or transfers to control rods by some lugs. It means providing separate support for this spool is not in the piping designer's scope of work except in a special situation.

Thank you NRAM

You shouldn't support it, but you should still account for its weight for other aspects of the design.

It depend on the size. Maybe pantograph link...

It is not often you can use an Untied Universal expansion joint, so you need to be careful.

Best regards,