Are you sure it was 9bar
Think you maybe mistaken
what the hell did he use to get the pipework to that pressure
I pressure test pipework at 8bar using an air compressor not that uncommon. test for 2 minutes though not 2 seconds.
Why??
Cannot see any reason for testing at that pressure on domestic installation and as had been said the kinetic energy involved is huge .... do you have any idea what damage you could do if the pipe fractures ... obviously not
I assume that your just a domestic installer that has no idea about carrying out risk assesstments into your testing
Crazy doing this ... all thats required is to carry out a test as per normal for any gas install and prehaps carry out after the job has been screed if your worried about movement etc
Not that uncommon!! ............... can you tell me where it says to test to this and could anybody else come forward thats done this on a domestic install