DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Overflow from Expansion Tank

This topic originated from the How to page called Plumbing in a cistern
Click here to return to the page called Plumbing in a cistern.
Goto page 1, 2  Next
 
Post new topic   This topic is locked you cannot edit posts or make replies    DIYnot.com Forum Index > Plumbing and Central Heating
Search this topic :: View previous topic :: View next topic  
Author Message
DaveB511

from United Kingdom

Joined: 05 Jun 2004
Posts: 12
Location: United Kingdom

PostPosted: Sat Jun 05, 2004 11:07 pm Reply with quote

Hi - the Overflow from the Expansion tank has recently started spewing hot water into the garden, at periodic intervals.
On investigating, the vent pipe from the hot-water cylinder is the culprit, with spurts of water topping the expansion tank up.
Any suggestions? Those that spring to my mind are:
(a) thermostat has gone
(b) hot water tank contains too much water initially
(both cases on the assumption there is too much water, so the excess is being fired out through the vent pipe)
Appreciate any advice on most likely cause, and possible solution
Tks
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
masona

from United Kingdom

Joined: 05 Jan 2003
Posts: 12729
Location: Essex,
United Kingdom
Thanked: 109 times

PostPosted: Sun Jun 06, 2004 1:55 am Reply with quote

Could be water expansion causes by overheating, I has this with mine and found the boiler stat was full of dusts, cleaned it out and now okay but turn off the mains first or could be the boiler stat setting is too high or faulty , try and turn the setting down and see what happen. You may have a sludge build-up which restricted the water flow back pressuring the F&E tank..
See what the others think


Last edited by masona on Sun Jun 06, 2004 5:35 pm, edited 1 time in total
Back to top
 Alert Moderators
oilman

from United Kingdom

Joined: 16 Sep 2003
Posts: 7965
Location: United Kingdom
Thanked: 26 times

PostPosted: Sun Jun 06, 2004 4:14 am Reply with quote

I think you should tell us something about your heating system, (see the post at the top of the forum). You haven't said what provides the heat, it could be a coal fired Parkray or an electric immersion heater, or perhaps it's not.
Back to top
 Alert Moderators
DaveB511

from United Kingdom

Joined: 05 Jun 2004
Posts: 12
Location: United Kingdom

PostPosted: Sun Jun 06, 2004 7:55 am Reply with quote

Apologies for not providing enough detail (I came to the forum from a Search, so didn't see the 'advice' posts initially).

Right - boiler is gas-fired GlowWorm (prob about 20 yrs old)
It's a 2-circuit system (cold-water and expansion tank in the loft)

No work has been done to it recently - only related work was earlier this year when i had thermostatic valves added to the rads.

Problem started late Friday, and happened again last night - both times at arund 9PM

One other thing - looking at the boiler itself this AM, the stat is set to 180, whereas I normally have it down closer to 140 - not certain when it was changed, and by whom, but shall be looking to find out
Back to top
 Alert Moderators
croydoncorgi

from United Kingdom

Joined: 06 Jun 2004
Posts: 4024
Location: London,
United Kingdom
Thanked: 333 times

PostPosted: Sun Jun 06, 2004 11:38 am Reply with quote

Several possible causes for F&E tank overflow:

In order of probability:

- if it's 'spurting' from the vent, chances are boiler is boiling (!) because the thermostat's set too high and / or it's failed to cut out on overheat (given your comments, the stat's implicated but I'd check out the boiler's overheat sensor too - also possibility it hasn't got one - CORGI job);

- if its trickling / running steadily from the vent pipe into the tank, so the tank water gets HOT AND you have a separate cold feed pipe from tank to C/H system, chances are that the cold feed is (partially) blocked. Common problem, requiring a bit of pipe replacement / rodding-out;

- if there's NOTHING coming out of the vent pipe, the F&E overflows AND the cold water tank level is HIGHER than the normal level in the F&E, possibility that the coil in the hot water cylinder is split / corroded through.
Back to top
 Alert Moderators
DaveB511

from United Kingdom

Joined: 05 Jun 2004
Posts: 12
Location: United Kingdom

PostPosted: Sun Jun 06, 2004 7:18 pm Reply with quote

Thanks for the replies

To confirm - it was 'spurting', not a steady stream/trickle

Early indications are that it is indeed the stat on the boiler itself - have put it back down to 140 (from 180), and thus far nothing has come through the vent pipe - will keep an eye on it over the next few days, and will look to the other suggestions if it recurs.

Thanks again

Dave
Back to top
 Alert Moderators
ChrisR

from United Kingdom

Joined: 24 Jul 2003
Posts: 23313
Location: London,
United Kingdom
Thanked: 1052 times

PostPosted: Sun Jun 06, 2004 10:05 pm Reply with quote

"Overflow from the Expansion tank has recently started spewing hot water into the garden, at periodic intervals.
On investigating, the vent pipe from the hot-water cylinder is the culprit, "

You didn't mean that did you?? icon_eek.gif The vent pipe from the hot-water cylinder shouldn't go to the heating f/e tank. ??
Back to top
 Alert Moderators
Vostick

from United Kingdom

Joined: 26 Jun 2004
Posts: 1
Location: United Kingdom

PostPosted: Sat Jun 26, 2004 6:23 pm Reply with quote

I have a similar problem with overflow from the expansion tank though it only overflows at the moment that the central heating is switched off (not the hot water).

Any ideas?
Back to top
 Alert Moderators
jackscout

from Ireland

Joined: 29 Jun 2004
Posts: 1
Location: Ireland

PostPosted: Tue Jun 29, 2004 10:34 am Reply with quote

I have a problem with the heating system .

System
Oil fire boiler (typical self contained insulted unit located outside) heating hot water cyclinder and 5 rads all located at ground floor-
Feed and expansion tank located overhead in attic
seperate cold water storage tank (both tanks located at the same level in attic)


The system was recently drained to allow removal (temporally) of a rad (rad was located adajacent to drain valve)

Problem

When the heating system is on for a period 15 minutes or longer (time necessary to heat water ) the feed pipe from the supply tank (hot water) gets very hot and fills with water, which backs up into the feed tank, quickly heating all the water within the tank to boiling point and eventually overflows (I fitted an overflow pipe to prevent it overflowing onto the ceiling.) Also there's a lot of steam starting to come from the boiler.
I have bled the pump, and rads several times and also allowed water run through the system while the drain valve was open before turning on the boiler.

Any advice much appreciated.
Back to top
 Alert Moderators
chambersn

from United Kingdom

Joined: 19 Aug 2004
Posts: 2
Location: United Kingdom

PostPosted: Thu Aug 19, 2004 11:28 am Reply with quote

I have recently started having water trickling out of the overflow from the hot water feed expansion tank. I have a 2 year old gas boiler. I originally thought the problem to be the ball valve so I replaced it (about 20 yrs old). The problem still occurred. It happens twice daily typically with the current hot water usage, and can be stopped by running the hot water tank for approx 1 minute. There is an overflow pipe feeding into the tank and I guess it is overfilling from this.

Is this the Emersion heater tank?
What can cause this?
What should I check out?

icon_sad.gif
Back to top
 Alert Moderators
Bahco

from United Kingdom

Joined: 08 Feb 2004
Posts: 7960
Location: Wolverhampton,
United Kingdom
Thanked: 79 times

PostPosted: Thu Aug 19, 2004 1:50 pm Reply with quote

Are you saying that your cold water cistern that feeds cylinder is overflowing and trickling outside your house icon_question.gif icon_confused.gif
If so check your float valve is set properly. The water should stop refilling the cistern 25mm below the overflow pipe. Bend the metal arm up or down to achieve this (gently with both hands not putting any pressure on the valve).
If water is entering the cistern from the vent pipe (crooked pipe bent over the cistern suspect cylinder stat is overheating and turn down or replace.
If water is entering from cylinder feed you have a split coil and need a new cylinder. icon_cry.gif
Attempt first one yourself but would consider calling a plumber/heating engineer for other two icon_smile.gif
Back to top
 Alert Moderators
chambersn

from United Kingdom

Joined: 19 Aug 2004
Posts: 2
Location: United Kingdom

PostPosted: Thu Aug 19, 2004 1:57 pm Reply with quote

Thanks for that! - Bahco.

I have carried out number 1, suspect 2 or 3, as described.
I'll let you know of outcome.
Back to top
 Alert Moderators
Steve A

from United Kingdom

Joined: 20 Aug 2004
Posts: 1
Location: United Kingdom

PostPosted: Fri Aug 20, 2004 7:48 am Reply with quote

I too have water flowing from my vent pipe.

My configuration is:

Vented system with a gas boiler (about 15 years old). Was working fine until I fitted a new pump in the bathroom and as a result had to fit a new hot water tank with a surrey flange (to prevent air going to the pump). The expelled water and the water in the loft tank are both luke warm but there is nothing coming from the vent pipe.

I can stop for short periods it by running off some hot water, otherwise it trickles about 1 pint every 5 10 minutes - onto my flat roofed garage!

As the hot tank is new (4 days old now) so I do not believe it has a split coil, but I cannot fathom out what else it could be.

But a side several other taps have started dripping - but I had put that down to the dirt in the pipes following the drain down etc.

Any clues would be gratefully received.

Steve A
Back to top
 Alert Moderators
shadow007

from United Kingdom

Joined: 26 Aug 2004
Posts: 3
Location: United Kingdom

PostPosted: Thu Aug 26, 2004 9:13 pm Reply with quote

BAHCO wrote:
Are you saying that your cold water cistern that feeds cylinder is overflowing and trickling outside your house icon_question.gif icon_confused.gif
If so check your float valve is set properly. The water should stop refilling the cistern 25mm below the overflow pipe. Bend the metal arm up or down to achieve this (gently with both hands not putting any pressure on the valve).
If water is entering the cistern from the vent pipe (crooked pipe bent over the cistern suspect cylinder stat is overheating and turn down or replace.
If water is entering from cylinder feed you have a split coil and need a new cylinder. icon_cry.gif
Attempt first one yourself but would consider calling a plumber/heating engineer for other two icon_smile.gif


I have a similar problem. I have an oil-fired boiler heating 5 or 6 radiators and hot water boiler. It is a very old system but I recently had installed a new burner but I think the problem of my f & e tank filling up has existed since before I changed the burner.

Bothe the F & E tank and main cold water ctank are at same level up in the attic.

I emptied the F & E tank to be down below the overflow outlet and have bent the ballcock way down to close off new water coming in and there don't seem to be any lvalve leakages. But still the F & E tank has filled right back up again the nex day 3-4 litres, past the overflow pipe and I get a steady drip drip down the side of the house. I notice also that my HW boiler heats only at the top and is not as hot as it should be. Can you please advise.
Back to top
 Alert Moderators
pat6921r

from United Kingdom

Joined: 29 Oct 2009
Posts: 2
Location: London,
United Kingdom

PostPosted: Thu Oct 29, 2009 3:39 pm Reply with quote

OK hare goes recently changed the zone valve as it was gone then the water pump went so i changed the head on that, im still getting water overflowing from tank upstairs in loft so much that the its coming into 1of the rooms I would understand if the heating was on but only the hot water was on,

I dnt knw wot to do could be thermostat or stat dnt knw wots the difference b4 i changed the zone valve water wld over flow into garden butknw its too much i have bleeded the system check for air etc etc n realesed air from every where

the system i have is old its a baxi boiler in the kitchen and a cylender tank int he 1st floor plz advise
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   This topic is locked you cannot edit posts or make replies    DIYnot.com Forum Index > Plumbing and Central Heating All times are GMT
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
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 vote in polls in this forum
Similar Topics   Replies   Views   Posted 
Expansion Tank Overflow Issue Questions 10 240 Thu Apr 10, 2014 8:09 am
Expansion tank overflow 18 15100 Sat Mar 11, 2006 3:45 am
Overflow into expansion tank 2 100 Thu Apr 28, 2011 3:56 pm
Overflow from Feed and Expansion Tank 20 6120 Sat Jun 09, 2007 10:57 am
Dripping overflow from expansion tank 8 4120 Tue Feb 22, 2005 9:46 am


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.