Dave Plowman (News) coughed up some electrons that declared:

In article
,
RobertL wrote:
I now realise of course that once the fitting was slackened it did not
take much force to slide the olive off the end of the pipe.

A properly fitted compression fitting doesn't allow the olive to 'slide
off'

The loud bang was because of all the compressed air in the pipe -about
1 litre of air at 70 Bar.

The entire system would explode with pressure anywhere near 70 bar. Mains
is rarely above 3 bar.


Worst case I've seen consistently is 7.5 bar.