Forgot to winterise!! Frozen

[KNWH]

Take a look at the science!
When you heat ice, the molecules gain kinetic energy, and the ice expands until it melts. But once all the ice has turned to water and the temperature starts rising again, expansion stops.

Well the graph says exactly the opposite.

 

[L' Hobo]

Wow sherry for breakfast!!!!!

Cognac on me porridge. Sherry indeed!

 

[Barclaybasher]

Anyone remember milk bottles popping the tops on freezing mornings - cream sticking out the top....

 

[VXman]

The drain tap is open but nothing has come out. But I'd forgot to open the kitchen/ bathroom taps anyways so I guess the boiler wouldn't drain (i think)

Most vans with Truma boilers have an auto frost protection valve aswell as the manual one. It's possible yours doesn't due to it's age but it could be nothing is draining as it has already drained. Frost protection valve looks something like this.

 

[yorkiebar]

Most vans with Truma boilers have an auto frost protection valve aswell as the manual one. It's possible yours doesn't due to it's age but it could be nothing is draining as it has already drained. Frost protection valve looks something like this.

View attachment 981364

Our diesel truma only has the manual drain valve and it's in a 2023 van.

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[Pausim]

Our diesel truma only has the manual drain valve and it's in a 2023 van.

Doesn’t say much for the constructor/installer if they left it out.

 

[jezport]

I think the physics says different! The maximum density of water is at 4c. Below that temperature it expands and freezes at zero to ice that continues to expand. So as ice warms it first contracts and continues to do so until 4c Above that it expands again.

View attachment 981348

Did an experiment in real life with a frozen 15mm pipe, gentle warming and it split.
Your chart shows density not mass.
The maximum density of water is at 4c. Below that temperature it expands and freezes at zero to ice that continues to expand. So as ice warms it first contracts and continues to do so until 4c Above that it expands again.

 

[KNWH]

Did an experiment in real life with a frozen 15mm pipe, gentle warming and it split.
Your chart shows density not mass.
The maximum density of water is at 4c. Below that temperature it expands and freezes at zero to ice that continues to expand. So as ice warms it first contracts and continues to do so until 4c Above that it expands again.

Now I’m really confused.
In this post you say ‘as ice warms it first contracts and continues to do so until 4C’
Yes, absolutely, that’s what the graph shows and I agree.

But in previous posts you have said
‘A fast defrost causes ice to expand’ and
‘Ice expands until it melts’
That is what I was saying was incorrect.

 

[jezport]

Now I’m really confused.
In this post you say ‘as ice warms it first contracts and continues to do so until 4C’
Yes, absolutely, that’s what the graph shows and I agree.

But in previous posts you have said
‘A fast defrost causes ice to expand’ and
‘Ice expands until it melts’
That is what I was saying was incorrect.

You are still getting mass and density confused

 

[KNWH]

You are still getting mass and density confused

I’ve never mentioned mass.
Can you not see you’ve contradicted yourself in the quotes above?

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[Sue and Rick]

If you are hookup, or can get a cable to your unit, then leave an electric fire on overnight to try and gently thaw things out. Then check the situation tomorrow.
Good luck

Might be a pile of ashes.

 

[The Wino]

Did an experiment in real life with a frozen 15mm pipe, gentle warming and it split.
Your chart shows density not mass.
The maximum density of water is at 4c. Below that temperature it expands and freezes at zero to ice that continues to expand. So as ice warms it first contracts and continues to do so until 4c Above that it expands again.

I don't really get your point! The mass will stay the same unless there's some sort of radioactive decay!!!
Yes ice at a low temperature will contract as it warms then melts at 0 into water that continues to contract until 4c. Above that temperature it expands again.
As I said an explanation for the pipe splitting could be that the water in the heated part of the pipe is unable to expand as theres a plug of ice either side and the force of the expansion splits the pipe. I do though think in most cases it's the ice expanding as it cools that splits the pipe not warming.

 

[Tonks]

I always thought that as it freezes it contracts then expanded when thawing?

Expands. Just look at anything liquid which you put in your freezer and you'll see that it has expanded when frozen compared to it's liquid state.