Heating Pipe blowout

[Deleted member 85424]

Im after some advice, My Keston C36 recently blew a pipe under the floor. When the engineers came to fix this they took the boiler cove off and there was a small leak at the heat exchanger. They tightened the screw slightly and we had our hot water and heating back. After about half an hour another pipe burst. I am in the process of getting this fixed but think that this problem is not because the pipes are plastic.
We have had low pressure issues with this boiler but it appears that now the pressure is too high. Is it possible that if the expansion vessel has ruptured and the heat exchanger or blow out pipe is faulty that this could cause the build up of pressure to be that severe it could burst a pipe. On the pipe they replaced it said the plastic pipes can withstand up to 10 bars of pressure so I dont know what is going wrong!

 

[SimonG]

Plastic pipe blowing off? I would be checking for inserts.

 

[PETE 123]

Could be overheating maybe? Plastic pipes getting to hot.

 

[Deleted member 85424]

The pipe literally exploded. There was a big hole in the side. The pipes are especially for central heating systems and do say they can take up to 10 bar of pressure.

 

[Last Plumber]

Rats ?

No offence !

 

[Ch4 plumbing]

The pipe literally exploded. There was a big hole in the side. The pipes are especially for central heating systems and do say they can take up to 10 bar of pressure.

What make are they??

Ive never seen a plastic pipe burst like your describing, its normally the fittings that split.

 

[Deleted member 85424]

Dont know if this has worked but this was the pipe taken out

 

[BobbityBob]

Nibble marks??

 

[SimonG]

Looks like a nail from that.

Drag marks on it as well.

 

[Deleted member 85424]

Nope, I was in when it exploded with a large bang and heard the water gush out from the boiler

 

[jonnyswamp]

How old is the pipe work/system

 

[Deleted member 85424]

The marks are from where the insulation was removed. Bear in mind these are thick pipes made to withstand up to 10 bar of pressure. Normal boiler pressure is usually around the 2 bar mark. 10 bar would burst a car tyre

 

[Last Plumber]

It looks like its been rubbing against something or been gnawed to me, which has weakened it

 

[Deleted member 85424]

Just turned 10 years old

 

[jonnyswamp]

Get on to the manufacturers rep and have them look at it
If there are no wear/rub/gnaw marks as you say and the boiler isn't kicking out 100c water/steam, then it may be faulty
Good luck on a 10 yr old product though

 

[snowhead]

What pressure is showing on the Gauge?

 

[Chalked]

That's a burst.
Gnawing or nails don't do that. Somthing wrong with the system here.

 

[zzzjim]

Pressure washers do similar bubble pops with a little bit of damage , then tear forms !

Does sound like over pressure , stay safe !

 

[kay-jay]

That looks identical to a situation i found a while back.
Rdents had been gnawing the pipe which created weak spots which then ruptured under pressure.

I would look under the floor for droppings

 

[Last Plumber]

That's a burst.
Gnawing or nails don't do that. Somthing wrong with the system here.

I was thinking Gnawing had thinned the wall and weakened it. Not gone all the way through.
I can't see it being anything other than a weak spot ?