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Re: Totally OT: Water tank weirdness

Cross-posted to 2 groups.

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Sylvia Else <sylvia@email.invalid> wrote

> The problem started with the appearance of dust and grit falling into  
> the bath. It was not at all obvious where it was coming from. With  
> showers being preferred, the bath is little used, so this wasn't coming  
> from the taps. I climbed into the roof space above the bathroom, but  
> nothing was apparently amiss.
>
> In the roof space there is an old tank, which I surmise was once the hot  
> water tank. It has long been unused, and was presumably left there  
> because it would be difficult to remove, and there was no compelling  
> reason to do so. There is also some pipework that I had originally  
> presumed was unused.
>
> It's very dusty up there, and I have to wear a proper filter mask. As I  
> was returning the mask to the garage area below the living area of the  
> house, where I keep such things, I heard a noise coming from the hot  
> water tank. Turned out there was a leak from where the heating element  
> goes in. Given that the tank is under pressure, the leak was making a  
> hissing noise.
>
> Now, some years ago, I tried to trace the origin of the water-hammer  
> noise, searching under the house without success.
>
> My visit to the roof space made me wonder whether that pipe was really  
> unused. Indeed it appears to have been sealed off. I now think that one  
> part of it goes down the wall into the garage area to join the hot water  
> output, with the other part heading down to the laundry. And where it  
> goes down the wall is close to where the dust and grit is falling into  
> the bath.
>
> All of which makes me think that the dust and grit in the bath and the  
> leak in the hot water tank are not unrelated. My theory is that this is  
> the pipe that makes the water-hammer noise, given that it's not well  
> attached to the framework,

That's not the reason for water hammer.

> and that the tank leak changed the hammer  pattern enough

Due to air getting in.

> for the pipe to disturb different dust/grit in the roof space which is  
> then able to enter the bathroom through a small gap in the ceiling trim.

The fix is to fix the leak, fill the small gap in the ceiling trim.

> On one level, this seems rather far-fetched.

Nope, water hammer moves the dust and dirt off the pipe.

> Yet the coincidence in  timing is remarkable.

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Thread

Totally OT: Water tank weirdness Sylvia Else <sylvia@email.invalid> - 2022-05-17 12:37 +1000
  Re: Totally OT: Water tank weirdness Noddy <me@home.com> - 2022-05-17 12:53 +1000
    Re: Totally OT: Water tank weirdness Sylvia Else <sylvia@email.invalid> - 2022-05-17 13:39 +1000
      Re: Totally OT: Water tank weirdness Noddy <me@home.com> - 2022-05-17 20:30 +1000
    Re: Totally OT: Water tank weirdness Xeno <xenolith@optusnet.com.au> - 2022-05-17 15:57 +1000
    Re: Totally OT: Water tank weirdness "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-18 11:24 +1000
  Re: Totally OT: Water tank weirdness Daryl <dwalford@westpine.com.au> - 2022-05-17 14:10 +1000
  Re: Totally OT: Water tank weirdness "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-18 11:08 +1000
    Re: Totally OT: Water tank weirdness Sylvia Else <sylvia@email.invalid> - 2022-05-18 12:46 +1000
      Re: Totally OT: Water tank weirdness Peter Jason <pj@jostle.com> - 2022-05-18 13:43 +1000
      Re: Totally OT: Water tank weirdness "Rod Speed" <rod.speed.aaa@gmail.com> - 2022-05-18 14:32 +1000

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