R
[email protected]
- Jan 1, 1970
- 0
I was filling my newly installed cistern (in the roof void) when, just
as the ball cock cut of the water supply, it started vibrating with a
hellofa big NOISE.
I tied to stop it by hanging my mediaeval plumbers wrench, cantileaver
style, by its jaws on the feed pipe with a vague idea to push if off
the resonant frequency but all that did was change the frequency... Ah
Ha! it needs *damping*.
I happen to have some expensive pipe lagging: 3 inch OD, 1/2 inch ID.
It is extremely absorbent and exhausting to fit (you have to slit it
longitudinally and force it open and onto the pipe inch by inch, it
takes the energy of of your hands very well indeed) that's why I never
got round to fitting all of it.
Once it was fitted: pure silence, like magic. Those expensive ball
cocks are unneccessary but no plumber will believe me. I wrote this to
the sunday building columnist of the Telegraph but he thinks I'm round
the bend.
I guess ya gotta be an engineer to see it? (Mind you the engineer(s)
who designed the Millenium bridge over the Thames did not understand
it either).
Robin
as the ball cock cut of the water supply, it started vibrating with a
hellofa big NOISE.
I tied to stop it by hanging my mediaeval plumbers wrench, cantileaver
style, by its jaws on the feed pipe with a vague idea to push if off
the resonant frequency but all that did was change the frequency... Ah
Ha! it needs *damping*.
I happen to have some expensive pipe lagging: 3 inch OD, 1/2 inch ID.
It is extremely absorbent and exhausting to fit (you have to slit it
longitudinally and force it open and onto the pipe inch by inch, it
takes the energy of of your hands very well indeed) that's why I never
got round to fitting all of it.
Once it was fitted: pure silence, like magic. Those expensive ball
cocks are unneccessary but no plumber will believe me. I wrote this to
the sunday building columnist of the Telegraph but he thinks I'm round
the bend.
I guess ya gotta be an engineer to see it? (Mind you the engineer(s)
who designed the Millenium bridge over the Thames did not understand
it either).
Robin