boosting my pressure

[Technotim]

I find it a bit strange that, people are suggesting that an accumulator is going to boost the pressure I have spoken to a manufacturer this morning and they say quite clearly that it will not increase the pressure; it will increase the flow via a volume of stored water that is pressurized by the incoming pressure.

In this case we have a family low pressure for running a mains cylinder ground floor level.
Add 4-5 meters then we have maybe 1.5 -1.8 bar that is not a good shower for the equipment discussed.

If what is being hinted at is to pump into the accumulator to stop the pump coming on and off so regularly then mrrigidtool says there is not a problem with this as it is in a garage.
Why go out and buy an accumulator?

I do not have a massive knowledge where accumulators are concerned but when it comes to pumps I know my biscuits.

It would be nice to have doubters expanding on there arguments rather than sniping comments. and yes I am having a BAD DAY!

 

[Technotim]

Sorry Gordon pants you have expanded you comments, as I posted,

We still have 2.0bar though

 

[Agile]

Accumulator is a big blue 'zilmet' vessel, just checked and its 250 litre, diaphragm is pressurised to 2 bar, so our 2 to 3 bar incoming fills the vessel up as much as possible, then forces it out when a tap is opened.

If its pressurised to 2 Bar and your mains is only 2 Bar then the vessel will not fill at all!

I dont know what Simon D recommends, but as a starting point you should pressurise to about 1 Bar if you have a 2 Bar supply pressure at the times you want to use it. Then it can store about 125 litres but you will not get all of that out.

Tony

 

[doitall]

Accumulator is a big blue 'zilmet' vessel, just checked and its 250 litre, diaphragm is pressurised to 2 bar, so our 2 to 3 bar incoming fills the vessel up as much as possible, then forces it out when a tap is opened.

If its pressurised to 2 Bar and your mains is only 2 Bar then the vessel will not fill at all!

I dont know what Simon D recommends, but as a starting point you should pressurise to about 1 Bar if you have a 2 Bar supply pressure at the times you want to use it. Then it can store about 125 litres but you will not get all of that out.

Tony

The blue Zilmet is an expansion vessel not an accumulator.

 

[doitall]

I'm not happy with any off what I've seen so far.

How is the pump connected, I assume to the cylinder cold feed with some sort of check valve to protect the mains

its not pumpimg from the mains its pumping from the storage tank, would have a job contaminating the mains unless it could climb up the ball cock.

I know you its pumping from the storage tank, somewhere in the cold feed to the cylinder the mains and the pump supply become common, HOW||!!!!!

 

[mrrigidtool]

sorry mr doitall did not catch that the mains will run into tank via ball cock and also supply kitchen sink with a check valve as standard, the pump will pump stored water to cylinder via a balancing valve located on cylinder, this will give pumped cold feed to cylinder and pumped cold feed to rest of house all via the tank, identical to an indirect gravity system only cylinder is unvented with exspansion vessel and cold gravity feed is having a bit of a kick start. if i've missunderstood please clarify

thanks

 

[Norcon]

Zilmet's Ultra-Pro series is available in blue or red and suitable for potable water.
The Hydra-Pro series is coloured blue and suitable for potable and non potable water.

 

[doitall]

Zilmet's Ultra-Pro series is available in blue or red and suitable for potable water.
The Hydra-Pro series is coloured blue and suitable for potable and non potable water.

Why thank you Norcon

It is generally excepted in the industry that Red vessel are two part and suitable for heating systems.

Blue vessels are normally use for boosted water.

And white vessels are for domestic hot and potable water.

And whatever color they are not accumulators.

 

[doitall]

sorry mr doitall did not catch that the mains will run into tank via ball cock and also supply kitchen sink with a check valve as standard, the pump will pump stored water to cylinder via a balancing valve located on cylinder, this will give pumped cold feed to cylinder and pumped cold feed to rest of house all via the tank, identical to an indirect gravity system only cylinder is unvented with exspansion vessel and cold gravity feed is having a bit of a kick start. if i've missunderstood please clarify

thanks

Got ya, it wasn't clear in the drawing.

A crude version of this then you need the negative head pump and expansion vessel to prevent the pump hunting.

 

[mrrigidtool]

sorry cant get my head around the neg head pump, if the feed tank is 4 meters above shower water is pushing down all the time then its going into pump if pump is below cylinder as well so outlet is pushing up all the time then the pump should always be full of water, got the bit about a vessel being a help, can anyone clarify the neg head issue.

thanks

 

[doitall]

Negative head pumps work on pressure, whereas positive head pumps work on flow.

 

[mrrigidtool]

sorry to sound simple will the pump i have work and will it effect performance if positioned above or below cylinder

 

[doitall]

sorry to sound simple will the pump i have work and will it effect performance if positioned above or below cylinder

If you have a positive head pump, No, it will not.

 

[Norcon]

sorry to sound simple will the pump i have work and will it effect performance if positioned above or below cylinder

If you have a positive head pump, No, it will not.

There is no difference between the actual pumps. I think what you are referring to is a "pumpset" like the one in your image which has the necessary components added (ie, expansion vessel , nrv and pressure transducers).
The component in the link I posted earlier houses the pressure switch and the nrv.

 

[Technotim]

You have a pressure switch with the pump as in the first post you have a pressure vessel you are sorted, that means it will fill you system boost up to the desired pressure you set the switch too, charge the vessel then stop.

It really does not matter where the cold water storage is in this case as long as it is above the pump.

On top of this product is the pressure switch it does not matter whether it is positive or negative as it has a pressure switch.