If first fixing a house in copper but having to use a tiny bit of plastic as the joiner has already done his first fix and cant get in to notch the joist bar the main run. Will this give problems as I would be pressure testing the copper at 1.5 working pressure. Not the 18 bar polyplumb tell you to first fix at. Will be like 4 to 6 plastic fittings on the heating pipework so barrier pipe.
House manily pipes in copper with a tiny bit of plastic
- Thread starter tomsim
- Start date
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I personally would hydraulic test at 1.5 the working pressure, baring in mind that the working pressure of the sealed central heating system will likely be something like 1.0-2.0 bar static, then a rise of about 0.5-1.0 bar when heated.
So testing the installation at about 4.5 bar would be my plan of action. I am unaware that polyplumb request a 18 bar test on their products, they do suggest the maximum working pressure their pipes should be subjected to and that would depend on the type of system it is being installed to.
So testing the installation at about 4.5 bar would be my plan of action. I am unaware that polyplumb request a 18 bar test on their products, they do suggest the maximum working pressure their pipes should be subjected to and that would depend on the type of system it is being installed to.
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Where did you get advised to test to 18 bar? 
That's a lot of pumping! They usually do 10 bar around here, it's quite dramatic if the pushfit stop ends fly off.
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Sure iv read polyplumb ask for 18 bar so the grab ring fully bite s up
Standard PolyPlumb installation instructions @dilalio - fill with water and pressurise to 18 bar for between 15 minutes and one hour. It's the same for most plastic pipe systems. If you don't do it, that lovely long warranty they offer will generally be invalid, as they can dismantle a joint and check the depth of the grooves left by the grab ring to make sure it's been tested to the required pressure.Where did you get advised to test to 18 bar?
Never done that! Never been asked!
I use Hep and take it to 1.5x working pressure for a while then up to 10bar.
Not so, the following is from their website...
First carry out a low pressure water test at 0.5 - 1 bar when the system is just demountable fittings, then a pressure test at 1.5 x the
normal working pressure with a recommended minimum of 10 bar for a minimum of 45 mins. However if any of our slimline fittings
are included with the system, then an 18 bar test for minimum of 45 mins should be carried out.
I use the white stuff so 10bar.
First carry out a low pressure water test at 0.5 - 1 bar when the system is just demountable fittings, then a pressure test at 1.5 x the
normal working pressure with a recommended minimum of 10 bar for a minimum of 45 mins. However if any of our slimline fittings
are included with the system, then an 18 bar test for minimum of 45 mins should be carried out.
I use the white stuff so 10bar.
That's why I'm worried about using abit of plastic on the system as it won't be getting pressure tested to 18bar
If you use Hep2O you only have to take it to 10 bar. If I use it I generally have far more copper joints on the system and never unduly worry about that if its a first fix.
this would be full copper bar 4 or 5 plastic fittings, which I would hope will be ok as would be testing to 18bar. Is a worry though
It's ridiculous! They are just covering their arses for litigation!
So I shouldn't be too concerned at not testing these few fittings at 18bar?
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