[[GQC] Tim]

How much water goes into a 400ltr baffled upright tank?

I'd love to have a scale on the side you know, telling you exactly how much litre is in the tank etc. But with the baffles, you can't really calculate it can you? Or is it as simple as, let's say full tank is 360, half of the tank 180ltr, etc. But would that work with the baffles in it?

Something tells me that that would work, but with the baffles, something tells me it's not that simple.

I'm very tired, so it might just be that I'm seeing things.   

[Spruce]

Hi
I know this is of no use to you, but the 500litre (single) baffled upright tank in my son's van holds 485litres when brimmed.
The manufacturers gave me that info.
He has the name of the manufacturer moulded into the tank in one corner.
If you know the name, then finding the manufacturer to answer your question may help.

Perhaps you could fill the tank from empty with a 20litre container and mark the 100l, 200l and 300l points. But most of us haven't the time or the inclination.
Spruce

[Davie T]

I am sure that what you see in the tank (looking from the outside) is what you have.
The baffles are in place to restrict water movement within the tank but do not influence how the water actually levels out at. The exception would be if the vehicle was at an angle forcing the water to one side rather than actually level.

[windowwashers]

Install a water meter that will give you the answer.

[[GQC] Tim]

I got the tank from Gardiners, think I'll give em an email, and ask them.

I am sure that what you see in the tank (looking from the outside) is what you have.
The baffles are in place to restrict water movement within the tank but do not influence how the water actually levels out at. The exception would be if the vehicle was at an angle forcing the water to one side rather than actually level.

Hm, that's what I'm not sure of, they displace water, simple illustration, if I'd have a glass of water, and I would dump something in there, the water level changes, same thing I reckon happens in the tank, so it would change the level?

Install a water meter that will give you the answer.

Watermeter, yes, but the problem is......I don't really want to put 400litre of unpure water in there,  otherwise it first has to go through the RO, and then you have to take off the waste etc. That's a bit difficult. Or are you talking about a third party watermeter, that you place between hoses? How much would that be?

[windowwashers]

Watermeter, yes, but the problem is......I don't really want to put 400litre of unpure water in there,  otherwise it first has to go through the RO, and then you have to take off the waste etc. That's a bit difficult. Or are you talking about a third party watermeter, that you place between hoses? How much would that be?

about £15 upwards have a look on ebay

[M & C Window Cleaning]

I keep meaning to do this but as yet have not had the time. But I will at some point follow the 25 ltr container method and fill my 400 ltr tank from empty marking it every 25ltr. The baffles will deffinitely displace the water and make the scale marks widen out up the middle section of the tank.

I wouldn't have thought the high tds reading of tap water in a thin skin of water left on the wall of your tank when you empty it would amount to much when disolved in nearly 400ltrs of 000 tds water.

My thoughts anyway.

[steve m]

simple- weigh it. Find out what it weighs empty and then full, water is a kilo a litre

[Alex Gardiner]

The 400 litre baffled tanks hold 400 litres.  The litre capacity is calculated allowing for the displacement caused by the baffles.  So half way down it has 200 litres in it because the baffles are symmetrical. This is about as precise as you can be as half way down again is not 100 litres due to now uneven baffle distribution (the baffles are not the full height of the tank) so quarter way down is probably more like 110 litres and three quarters full is probably about 290 litres.  I hope this helps.

[[GQC] Tim]

The 400 litre baffled tanks hold 400 litres.  The litre capacity is calculated allowing for the displacement caused by the baffles.  So half way down it has 200 litres in it because the baffles are symmetrical. This is about as precise as you can be as half way down again is not 100 litres due to now uneven baffle distribution (the baffles are not the full height of the tank) so quarter way down is probably more like 110 litres and three quarters full is probably about 290 litres.  I hope this helps.

Wow, it actually does hold 400liter then?! That's great. Thought it would be less. I'll think I'll figure it out with my little watermeter that I bought, and a bit of patience.

Thank you Alex.

[TVCS]

measure the height of the tank, full = 400lt.
Half the height = 200lt.
Quarter etc etc etc.  Unless you need to know every lt this has always been close enough for me.

[[GQC] Tim]

measure the height of the tank, full = 400lt.
Half the height = 200lt.
Quarter etc etc etc.  Unless you need to know every lt this has always been close enough for me.

Yea I guess you are right, what's 10 liters anyway.

[Spruce]

The 400 litre baffled tanks hold 400 litres. The litre capacity is calculated allowing for the displacement caused by the baffles. So half way down it has 200 litres in it because the baffles are symmetrical. This is about as precise as you can be as half way down again is not 100 litres due to now uneven baffle distribution (the baffles are not the full height of the tank) so quarter way down is probably more like 110 litres and three quarters full is probably about 290 litres. I hope this helps.

Wow, it actually does hold 400liter then?! That's great. Thought it would be less. I'll think I'll figure it out with my little watermeter that I bought, and a bit of patience.

Thank you Alex.

Hi Alex
This means that the unbaffled tank must hold more water as it has identical diamensions to the baffled one.
Spruce

[[GQC] Tim]

True, but would you really want 400l slushing about?!   

[steve m]

dont see the point of marking water levels, what happens when your on a slight hill??. I've yet to park a van on a dead level bit of road

[Spruce]

True, but would you really want 400l slushing about?!

Hi

I agree.

I certainly won't suggest that an unbaffled tank be used - safety is the most important thing.

I was just comparing both tanks. As they are identical sizes then the baffled one must hold a little less water.

Spruce

[Alex Gardiner]

The 400 litre baffled tanks hold 400 litres. The litre capacity is calculated allowing for the displacement caused by the baffles. So half way down it has 200 litres in it because the baffles are symmetrical. This is about as precise as you can be as half way down again is not 100 litres due to now uneven baffle distribution (the baffles are not the full height of the tank) so quarter way down is probably more like 110 litres and three quarters full is probably about 290 litres. I hope this helps.

Wow, it actually does hold 400liter then?! That's great. Thought it would be less. I'll think I'll figure it out with my little watermeter that I bought, and a bit of patience.

Thank you Alex.

Hi Alex
This means that the unbaffled tank must hold more water as it has identical diamensions to the baffled one.
Spruce

We don't do unbaffled 400 litre tanks but if you did have a tank with exactly the same dimensions as our baffled 400 litre tanks but had no baffles it would hold more water (not the baffled tank holding less!)