Plastic or Copper piping?

[petercj]

If the system is in plastic but the water is spotlessly clean then no I wouldn't recommend a PowerFlush. Systems with a lot of plastic pipe are more prone to sludge up and it's more important to inhibit the system on a regular basis, but in reality, who keeps there inhibitor topped up.


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"spotlessly clean"

'Spotlessly clean' seems to be the BG standard, which is unrealistic after a system has been running for a number of years because steel radiators will produce magnetite even with inhibitor in the system - as the word suggests, the additive 'inhibits' rather than prevents corrosion completely.

I think BG must train their fitters to condemn plastic speed fit based on the myth that plastic pipe will suck air - being a reputation SF got in the early days of its use when non-barrier pipe was mistakenly fitted to CH systems.

Whilst copper may be the better choice most of the time, SF has got a bad name through being misused. Plus, its potential for making plumbing easier, and so expanding the DIY market, has fueled an antipathy in the trade.

As the price of raw copper rises there will be a tendency for copper pipe to be made of thinner and cheaper alloys, which will, no doubt, reduce the reliability and life of a lot of the copper pipe now being used. Like it or not, plastic is the future.

 

[Doodlebug]

Have you got nothing positive to say about British Gas at all? All I've heard from you since I joined this site is constant whining about how bad British Gas is.
Back on subject, spotlessly clean was probably the wrong choice of words as I agree that's not realistic, what I meant to say was "clean". Now I visit a lot of blocked systems and I've come across a lot that are due to plastic pipes. Yes some are piped in copper but the majority are plastic pipe systems. You are probably correct in saying its more than likely down to the fact that the DIY man uses plastic.


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[petercj]

Have you got nothing positive to say about British Gas at all? All I've heard from you since I joined this site is constant whining about how bad British Gas is.
Back on subject, spotlessly clean was probably the wrong choice of words as I agree that's not realistic, what I meant to say was "clean". Now I visit a lot of blocked systems and I've come across a lot that are due to plastic pipes. Yes some are piped in copper but the majority are plastic pipe systems. You are probably correct in saying its more than likely down to the fact that the DIY man uses plastic.


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"Have you got nothing positive to say about British Gas at all?"

If you can leave that with me, I will give it some thought!

The reason I posted was that what you have said is what all the BG fitters I have spoken with say - i.e. they all condemn plastic out of hand.

If I am as innately critical of BG as you imply, I have to say that you are the converse Doodlebug - in fact you seem to be to British Gas what Howard was to the Halifax!

How do BG get all their blokes to say the same thing?

Does the training end with: "321 ... you're back in the room"?

 

[Doodlebug]

You do make me laugh mate "321 your back in the room" classic.
I only say what I see mate. I'm not the British Gas Howard pmsl
In fact I am critical of British Gas myself. The hard facts are, plastic pipework is more prone to blockages if not maintained. If the inhibitor levels in a plastic pipe system were kept adequate and the system itself was installed correctly then I've no doubt that the plastic pipe would be just as good as copper. But the reality is, when decorators or plumbers or custards drain radiators they don't top the inhibitor back up. Obviously even in a copper piped system it's important to keep a check on inhibitor levels but in my opinion it's more important with plastic pipe systems.

 

[DirksPlumbing]

@OP: Add another point to your disadvances on plastic: oxygen intake. I only once read someone stating in this thread that you have to use barrier pipe if you want to use plastic. Everything else would be a build in guarantee for heavy corrosion.

I personally prefer MLCP where unseen or to feed through inaccessible passages. On show I prefer copper. Or if it comes to larger diameters.
MLCP combines some of the better properties of both worlds.
If you find aluminum eating mice then their big brothers will eat copper too soon. You can bend it to shape and it does not sack unless completely unclipped over large distances. Just a bit like copper. You can avoid unnecessary fittings through that. Goes great in conjunction with manifold systems. It is as oxygen tight as copper. It is quickly installed. It lasts long.
You get brass crimp fittings for it. The 16mm pipe can get joined via compression adapters straight onto your manifold/compression fitting/valve/tap. But now you get push fits for it as well if that is your world.
Only thing is once the connection is done you can only cut it out.

 

[Bernie2]

Err! Interestingly I think copper pipe has been found to have anti bacterial properties and is favoured for use by the NHS?

I would also add it also produces verdigris which is a type of poison.

I like it and prefer it to plastic. Plastic as said entrains air unless barrier pipe is used. I also have many other doubts about it. I have been in pubs where the mice have eaten through the nylon pipes trying to get to the ale. High temperatures make it go like skipping rope.

The upside is its cushy and easy to install and like flexies makes a lot of plumbing a very simple job.

 

[deadstare]

With the introduction of the copper push fit fittingswhat is the reason again that anyone would choose plastic as their preferredchoice

 

[AWheating]

plastic or copper is my prefered choice dependant on the jobs installation requirements! 🙂

 

[AWheating]

those that dismiss one system all together are just reducing the scpoe of work they can do. Most new builds now use chamber,i beam, cross webb joist systems and plastic pipework systems are the ideal choice. Anybody who has had to put a 28mm gas carcus in with these types of joists 12" apart will know that doing the same throughout the property for the heating and hot and cold would be a mare.

Ive said it many times that plastic takes skill to install correctly but can be installed by idiots alot easyier than copper. What you get off most plumbers when they find problems with plastic systems is "plasitc is crap" but when you get problems with copper systems its the installers fault. Lets be honest its normally the installers fault for installing incorrectly or using the wrong materials. Its not the plastic manufacutres fault that an installer did not use barrier pipe on a heating system, so why blame plastic?

 

[TBServices]

those that dismiss one system all together are just reducing the scpoe of work they can do. Most new builds now use chamber,i beam, cross webb joist systems and plastic pipework systems are the ideal choice. Anybody who has had to put a 28mm gas carcus in with these types of joists 12" apart will know that doing the same throughout the property for the heating and hot and cold would be a mare.

Ive said it many times that plastic takes skill to install correctly but can be installed by idiots alot easyier than copper. What you get off most plumbers when they find problems with plastic systems is "plasitc is crap" but when you get problems with copper systems its the installers fault. Lets be honest its normally the installers fault for installing incorrectly or using the wrong materials. Its not the plastic manufacutres fault that an installer did not use barrier pipe on a heating system, so why blame plastic?

Agreed. Plastic has its place, especially for heating systems in new builds. The problem with plastic is it's perception by non-plumbers, who think that soldering is the hardest part of the job (lol) so therefore, plastic pipe means they are instantly competent plumbers.

On a side note, please correct me if i'm wrong, but i thought that sludge in a system was a byproduct of the reaction of ferrous, non-ferrous metals, moisture and air within a heating system, which the inhibitor, well, inhibited. Therefore, less copper = less sludge?


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[petercj]

Agreed. Plastic has its place, especially for heating systems in new builds. The problem with plastic is it's perception by non-plumbers, who think that soldering is the hardest part of the job (lol) so therefore, plastic pipe means they are instantly competent plumbers.

On a side note, please correct me if i'm wrong, but i thought that sludge in a system was a byproduct of the reaction of ferrous, non-ferrous metals, moisture and air within a heating system, which the inhibitor, well, inhibited. Therefore, less copper = less sludge?


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Magnetite aka sludge (the black stuff) is produced by steel/iron radiators

 

[TBServices]

Magnetite aka sludge (the black stuff) is produced by steel/iron radiators

Yes, but is it not the chemical difference between the copper and the steel that creates the magnetite? I can't remember where I picked this up, probably from college.


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[petercj]

Yes, but is it not the chemical difference between the copper and the steel that creates the magnetite? I can't remember where I picked this up, probably from college.


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Magnetite in radiators is a product of corrosion, and the more oxygen there is in the water the faster the process will be - IF plastic pipe did allow air to pass, then that would explain excessive sludging. I've never heard that plastic will reduce the tendency for magnetite to form.

 

[SimonG]

Nowt wrong with plastic, when installed correctly. Trouble is most of the time it's thrown in by people who don't read the mi's. It's a nice addition to the arsenal and has it's place. I only have two issues with plastic, vermin chewing it and muppets installing it incorrectly.

Was there all this commotion when we went from lead to copper?

 

[TBServices]

Magnetite in radiators is a product of corrosion, and the more oxygen there is in the water the faster the process will be - IF plastic pipe did allow air to pass, then that would explain excessive sludging. I've never heard that plastic will reduce the tendency for magnetite to form.

Right, hence the barrier. So when we're talking about excessive buildup here, we're on the assumption of using the incorrect pipe.


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[DirksPlumbing]

Right, hence the barrier. So when we're talking about excessive buildup here, we're on the assumption of using the incorrect pipe.

Well yes but no. The barrier is only hindering the process of oxygen intrusion. It is not a stop. If we are talking about excessive sludging in short period of times then most likely non barrier pipe has been used. But without inhibitor a plastic system has no chance but sludging. Hence my favorite MLCP as the metal layer is oxygen proof not only a barrier.
Although massive sludging can be caused by leaks as well because of adding constantly oxygen rich water to the system.

As for the copper mentioned in the process of sludging then that is explained by the fact that the different metal ions dissolved in the water do speed up the process of corrosion massively but once the oxygen has been used up then that stops. Meaning if you had a system that does not comprise anything but steel and plastic the process would be slower. But due to the oxygen intrusion still never stops. Just that would require a complete absence of other metals but the sort of steel used for the radiator. It actually could endanger SS heat exchangers as them would start rusting then just as normal steel.

So there is an easy rule: If it is open vented system use inhibitor, if it is a sealed system comprising plastic use inhibitor, if it is a sealed system comprising metal aka copper use inhibitor. The last theoretically does not need it that urgent but how do you make 100% sure that the integrity of the system never ever gets disturbed? As soon as the customer has to top up the system or the boiler comprises plastic fittings or..., well you need it.

But then again we should keep that quite as the volume of system cleans has dramatically reduced over the recent years and I have no other explanation than the use of inhibitor becoming more wide spread. At least for me.

As for the antibacterial feature you can use PVCC pipe as well as it even reduces buildup of lime scales. I had been told that PVCC would be preferred by NHS?

 

[petercj]

Look for the relevant British Standard markings on the pipe:-

John Guest Speedfit - The World Leader in Push-fit Fittings, Pipe and Plastic Plumbing Systems - PEX BARRIER PIPE IN COILS

 

[TBServices]

Good answer dirks!


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[petercj]

Good answer dirks!


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There is a lot of cobblers talked about the use of plastic in central heating systems - plastic has been widely used in the manufacture of vehicle radiators for the past 25 years without major problems - with water at 100c +.

O rings have been used in aero-engineering for decades - next time you take off in a plane spare a thought for the fact that your life depends on those O rings in the system holding up!

A Valliant staff engineer told me that most of the blockages he sees in heat exchangers can be linked to muck being downloaded from header tanks when the system is drained.

A mild steel container such as the average household radiator is going to corrode and produce some kind of debris, however, the process can be slowed down by using inhibitors. Copper and SS are a different matter - both are alloys, and so the quality of each will dictate how well they perform in use. Copper pipe in reasonable nick has been found in Roman ruins. Good quality SS is very resistant to corrosion, and I doubt that corrosion would ever be a problem with a SS heat exchanger unless a problem was caused by a chemical within the water - most metals don't like common-a-garden salt, including aluminium alloys, and poor quality SS can be affected by salt. However, water in a CH system is the same water that goes round and round, and so the content of such water is bound to be fairly stable. Limescale for example, requires fresh water to be constantly introduced and heated to produce a scale. Magnetite (as the name suggests) is magnetic, and so will generally stay in the radiator in which it is produced. The chemicals used to clean CH systems work because they lift magnetite into suspension, making it easier to flush out.

Whereas the problems caused by sludge and scale are unlikely to be all down to myth, the companies who make flushing and cleaning chemicals have a vested interest in exaggerating the problems. If a radiator is so full of sludge that it doesn't heat up as it should, then obviously it needs cleaning out.

For a CH system to become severely sludged, or for a heat exchanger to become blocked by scale, the process is going to require freshly oxygenated water, probably a lot more than can be passed by a plastic pipe, even if it hasn't got a barrier.

How many people on here can honestly say they always check the header tank for muck and debris before draining a system?

Much easier to say that a blocked heat exchanger can be traced to plastic pipe than admit that it's become blocked due to muck being introduced into the system from the header tank, or some other external source.

Whilst copper is usually the best choice, plastic pipe is another - much hated and defiled as it is by many people in the trade.

 

[DirksPlumbing]

There is a lot of cobblers talked about the use of plastic in central heating systems - plastic has been widely used in the manufacture of vehicle radiators for the past 25 years without major problems - with water at 100c +.

Much easier to say that a blocked heat exchanger can be traced to plastic pipe than admit that it's become blocked due to muck being introduced into the system from the header tank, or some other external source.

Whilst copper is usually the best choice, plastic pipe is another - much hated and defiled as it is by many people in the trade.

I am just struggling to explain all the sludged up sealed systems. Or the ones been build from scratch.

And I hope your car mechanic does not fill pure water into your cooling system. Even the use of tap water is to avoid unless there is an emergency and nothing else available.

Just as I hope that you would see the difference between algae etc. and magnetite. A magnet helps on that.

As for the planes, are you gonna go and service the boiler/pipe system at a similar frequency? Do your customers allow that to you?