Dear xxxx
As you know there are a number of ways to accommodate expansion of pipework: loops, bellows, horseshoe. What is also important is where the anchor points are. I would recommend that you read the Installation Tip - Fixing Copper Tube, which covers clips/brackets, expansion devices.
http://www.ukcopperboard.co.uk/literature/pdfs/Installation-Tips/Fixing-copper-tube.pdf
If you have further questions please come back to us.
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Dear xxxx
I passed your enquiry on to a colleague for his thoughts. He has been in the plumbing industry for a long time, including many years as a plumbing teacher.
His first thought was to contact the fittings manufacturer. There are a great many variables in the installation and it may not be possible to say for sure whether a failure is about to happen or whether the joint will last for many years.
Unknowns include: how often does the temperature cycle, what type of solder was used, did the soldering/brazing process soften the fitting.
The fitting is probably either YF or IBP:
http://www.yorkshirefittings.co.uk http://www.ibpconex.co.uk
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