DIY Forum

DIY Forum/Home improvement advice

 

 

A-Z CONTENTS | DISCLAIMER | DIRECTORY | DIY VIDEO | HOME | SAFETY FIRST | FORUM RULES

It is currently Thu Jul 31, 2014 10:37 pm


Time zone: Europe/London [ DST ]




 

 


Post new topic Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Thu Mar 15, 2012 9:43 am 
Offline
Senior Member

Joined: Tue Jan 25, 2011 12:33 am
Posts: 165
Has thanked: 5 times
Been thanked: 9 times
Does anybody know where to find information on how to size up an accumulator

taking into account the flow rate and usage (no of showers etc)

Thanks

Also.

when having the choice what would you do

install an accumulator, or a home booster system from Grundfos - Noise is no issue as the unit will be intalled in a seperate plant room next to the boiler and hot water storage tank


Top
 Profile  
 

You may not be able to see the full post including pictures unless you register or log in

PostPosted: Thu Mar 15, 2012 2:03 pm 
Offline
Senior Member
User avatar

Joined: Fri Mar 11, 2011 10:55 am
Posts: 4182
Location: Glasgow
Has thanked: 439 times
Been thanked: 403 times
It would depend on what your existing incoming water mains supply is like, pressure & flow. For large demands a accumulator is useless, you'll required a large breaker tank & pump.
HTH

_________________
Time-served Plumber/Heating Engineer & general wind-up merchant.
The Plumbers Anthem
If you have found my help or tips useful please donate here. Thank You;
donnas-dream-house-charity-t52110.html
Gas Safe RGI
Scottish, British & Proud.
I'm not or never claimed to be Chris Williams.


Top
 Profile  
 
PostPosted: Thu Mar 15, 2012 3:20 pm 
Offline
Senior Member

Joined: Tue Jan 25, 2011 12:33 am
Posts: 165
Has thanked: 5 times
Been thanked: 9 times
Dickie wrote:
It would depend on what your existing incoming water mains supply is like, pressure & flow. For large demands a accumulator is useless, you'll required a large breaker tank & pump.
HTH



static pressure is 2.5 bar. and flow rate is arround the 18 liters per min,

and we have arround 3 showers, they will ofcourse not be used at the same time al the time, but need to size it properly

the current set up will not suffice, and you will get starvation. so therefore you can use an accumulator, (please explain as to why it is not usable for large demands?).

In principle there is no need for a pump with a static bar of 2.5 but it having it can help (the house is over 3 floors- with one shower on the top floor). an accumulator works on the static pressure of the mains and is just a massive expansion tank which fills up when there is no demand or the demand is less then the flow rate requested.

when flow rate exceeds the current 18l per min the accumulator will supply the shortfall under the current static pressure

what i need/like to know what is what kind of accumulator do i need to have to overcome that starvation at the showerhead


Top
 Profile  
 
PostPosted: Thu Mar 15, 2012 4:20 pm 
Offline
Senior Member
User avatar

Joined: Fri Mar 11, 2011 10:55 am
Posts: 4182
Location: Glasgow
Has thanked: 439 times
Been thanked: 403 times
With a static pressure that low, I'd hate to think what your dynamic pressure is!! Don't fit an accumulator mate, your mains water is not up to it. Plus, if there's a water main burst in any part of their network, you'll be knackered!! I'd avise a breaker tank & pump.
HTH

_________________
Time-served Plumber/Heating Engineer & general wind-up merchant.
The Plumbers Anthem
If you have found my help or tips useful please donate here. Thank You;
donnas-dream-house-charity-t52110.html
Gas Safe RGI
Scottish, British & Proud.
I'm not or never claimed to be Chris Williams.


Top
 Profile  
 
PostPosted: Thu Mar 15, 2012 9:36 pm 
Offline
Senior Member

Joined: Tue Jan 25, 2011 12:33 am
Posts: 165
Has thanked: 5 times
Been thanked: 9 times
What is a breaker tank doing different then an accumulater or a Grundfos home booster system


Top
 Profile  
 
PostPosted: Thu Mar 15, 2012 9:55 pm 
Offline
UHM Super Moderator

Joined: Mon Aug 08, 2005 10:43 pm
Posts: 2783
Has thanked: 164 times
Been thanked: 370 times
Around half the volume of an accumulator is useful as a rough rule of thumb so a 300l one will give you roughly 150l of boosted supply :wink:

_________________
I have not failed. I've just found 10,000 ways that won't work


Top
 Profile  
 
PostPosted: Fri Mar 16, 2012 8:10 am 
Offline
Senior Member
User avatar

Joined: Fri Mar 11, 2011 10:55 am
Posts: 4182
Location: Glasgow
Has thanked: 439 times
Been thanked: 403 times
mcluma wrote:
What is a breaker tank doing different then an accumulater or a Grundfos home booster system


With a breaker tank, you can store as much low pressure water as you wish & with a pump you can boost that supply. So you'll have an endless supply.

With any high demand system & a acculmulator, the dynamic water pressure & flow rate is very important.

_________________
Time-served Plumber/Heating Engineer & general wind-up merchant.
The Plumbers Anthem
If you have found my help or tips useful please donate here. Thank You;
donnas-dream-house-charity-t52110.html
Gas Safe RGI
Scottish, British & Proud.
I'm not or never claimed to be Chris Williams.


Top
 Profile  
 
PostPosted: Mon Mar 19, 2012 11:47 am 
Offline
Senior Member

Joined: Tue Jan 25, 2011 12:33 am
Posts: 165
Has thanked: 5 times
Been thanked: 9 times
The flow rate that i have measured is 15l per minute and the static pressure is 2.5 bar

the property is over 3 floors. and will be newly equiped with an megaflow system - the plumber i have hasn't done any installations of an accumulator in a domestic dwelling

the 2.5 bar is according to the plumber enough, but the concern is the following 1 flow rate for 3 showers , and will the 2.5 bar still be enough on the top floor wich is about 9 meters above his measure point?


Top
 Profile  
 
PostPosted: Mon Mar 19, 2012 3:03 pm 
Offline
Senior Member
User avatar

Joined: Fri Mar 11, 2011 10:55 am
Posts: 4182
Location: Glasgow
Has thanked: 439 times
Been thanked: 403 times
Well, 3 showers @ 12Ltr each = 36Ltr!!
Too many ifs & buts, I'd fit a breakers tank & pump.

_________________
Time-served Plumber/Heating Engineer & general wind-up merchant.
The Plumbers Anthem
If you have found my help or tips useful please donate here. Thank You;
donnas-dream-house-charity-t52110.html
Gas Safe RGI
Scottish, British & Proud.
I'm not or never claimed to be Chris Williams.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 



Similar topics
   

Time zone: Europe/London [ DST ]


Who is online

Users browsing this forum: No registered users and 0 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  


News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list
ultimatehandyman privacy policy

Contact

 



phpBB SEO