Hello Friend! Once, I told you that when I work as a plumber, I specially screw self-tapping screws into the water supply pipes to check the presence of pressure in certain cases. Photo above.
Also, our plumbers do not disdain in this way, in the basements of houses, if you want to drain the water from the risers.
All these methods of work, under forced circumstances, were sharply condemned. I completely agree with the readers. You can't work like that. But when they really needed to do it ...
Recently, I had the opportunity to pump high pressure into pipes with the help of AED. A thought arose, and how the self-tapping screws will behave, in the pipe, under high pressure. Will they be ripped out, knocked out, or will the pipe burst because of this? Now let's find out:
To do this, I assembled such a piece of pipe with a polypropylene ball valve at the end.
Applied pressure... Unfortunately, the valve broke down and burst.
I had to weld a coupling with an internal thread to the end of the pipe and screw a plug into it.
It withstood the pressure perfectly, at its peak it was more than 100 atm. Next step: Screw a self-tapping screw into this pipe, without pressure!
We pump up the pressure to 100 bar... Strange... But the self-tapping screw holds, it was not spat out, the pipe did not break.
The only place where the screw is screwed in starts to let water through. But this is natural, the pipe expands from the inside and the gaps increase.