Fortic cylinder tank

[Scott Fairley]

Hi just looking for some advice, l have a fortic cylinder tank with the cold water tank attached above one unit, l replace my taps in the bathroom bath and basen l turned the water off on th he tank and l have an isolated valve to turn the water of for the bathroom supply, l have come to turn on the water and the water tank made a bit of a nose and shak l have cold water but no water coming out of the hot tap l though it maybe an airblock so l connected the cold water tap to the hot to clear any air through but still no water the fencing feed going into the tank is working the ballvalve is okay and new but the cold water feed into the tank allowing it to fill up will not stop and l had to tern it of it was gushing out of the overflow pipe do l need a new tank.?

Tomm

 

[Madrab]

Unfortunately, your post is a little confusing.

You say you shut the hot water down to change the bathroom taps? Where/how did you shut the hot water down? What kind of tap(s) did you fit? Were they designed for very low pressure?

You thought you had an airlock so you ran cold water back up through the HW pipework, was that mains cold water?

You say you have change the ballcock in the cold cistern on the top of the cylinder but the cold feed in into the cistern is not stopping and it's overflowing out of the overflow? That doesn't make any sense I'm afraid. If there are no HW taps open then the cold feed into the cylinder wouldn't be running. If the ballvalve is working and stopping the cistern from filling then once the cold cistern has filled up then there should be any more water running either. Have you installed a mono mixer tap and are now getting reverse flow from the cold mains into the HW cylinder via the hot water pipework?

 

[CBW]

Did you turn off a gate valve to isolate the hot water? If so, I reckon this may have snapped.

 

[Scott Fairley]

Hi yes the gate valve was turned off the top part of the tank seem to be working with the ballvalve but it's the gate valve the water seem to be just filling the tank up and not stopping

 

[Madrab]

It's the ball valve and float that stops the water running in the top of the cylinder - the cold water cistern - if the water is still running into the cold water cistern, when the ball valve is at the top, then the ball valve isn't working. The water in the top can't keep filling up the cylinder, once it's full then it's full.

If the cold water 'tank' keeps filling via the ball valve then it isn't working. If the water in the cold tank has stopped filling via the ball valve but the water keeps rising then it sounds like the cold mains is back filling the cylinder through a mixer tap.

What kind of tap(s) did you fit?

 

[Scott Fairley]

Ok yes it's back filling if l put a valve on it will that stop the water from going from the cold down the hot tap? is that why when l turn on my gate value it's filling the tank up and not stopping.

 

[Scott Fairley]

Also if that works and l still have no water from the hot tap these tanks are crap for pressure would you recommend a new tank that can hold pressure?

 

[Scott Fairley]

Only one bathroom mixer tap for the bath but before l connected the tap l put 2 normal taps on the basin and trid the water running through the the cold was ok but no water out of the basin tap l didn't contact the mixer at this point

 

[JimCrow]

Hi just looking for some advice, l have a fortic cylinder tank with the cold water tank attached above one unit, l replace my taps in the bathroom bath and basen l turned the water off on th he tank and l have an isolated valve to turn the water of for the bathroom supply, l have come to turn on the water and the water tank made a bit of a nose and shak l have cold water but no water coming out of the hot tap l though it maybe an airblock so l connected the cold water tap to the hot to clear any air through but still no water the fencing feed going into the tank is working the ballvalve is okay and new but the cold water feed into the tank allowing it to fill up will not stop and l had to tern it of it was gushing out of the overflow pipe do l need a new tank.?

Tomm

Are you sure it's the "overflow" that's running and not the drain down?, both pipes will go outside,
It's likely you are constantly emptying the tank, have you opened a sludge cock or gate valve at the bottom of the tank and not closed it again before filling the tank back up?.

sludge cock gatevalve

 

[Scott Fairley]

Hi mate the gate valve l have turned this off when it's open full the amount of water went all the way up and it was around an inch from coming over the top of the tank,
I started with changing the taps in the bathroom so l turned the water off at the mains l the turned the gate valve to close and the tap just above it which feeds the top part of the tank l changed the 2 basin taps with 2 single taps, l the put a vent valve think that's what it's called on the hot tap pipe work as the new tap is a mixer so the cold water doesn't go down the hot tap, l then turned on the mains water, l then turned the tap above the gate valve on this is where the ball valve leads to, l then turned the gate valve on to open the tank made a bit of nose like air was bubbling out of the top the water kept rising and wouldn't stop so l turned the gate valve off l though it maybe air blockage in the hot water pipe so l connected a bit of hose pipe from the cold tap to the hot and ran it for a couple of seconds which cleared any air out as the cold water was the coming out of the hot tap l hope this is making some sense? So l am a bit stuck the tank is a fortic cylinder tank with the water tank just on top it's a all in one tank though it mite be crossflow but lve checked and all okay l did read that the coil may have a leak in it and that's why when l open the gate valve it will not stop filling up but lm not sure any ideas?