Replacing main water pipe Anglia water. what to use. Help

J

Jonny Vee

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Hi Everyone.

I made request to Anglia water to replace my lead pipe with a new polyethylene pipe.

They sent me instruction on how the pipe should be laid but I`m struggling to source material at moment.

I have attached guide for your reference.

They suggest a 25mm pipe. Is this good enough https://www.screwfix.com/p/mdpe-pipe-blue-25mm-x-50m/19606

Also the pipe need to be insulated and put into a duct when enter the building.

They do not say how thick need to be insulation and how big need to be the duct and I have no idea how to seal it.

If anyone has experience could point me to some product that I could use.

The trench need to ne 750mm which seem quite deep and pipe need to be bedded and covered in sand. Do they mean covered in sand till the top or actuall before th 100mm concrete slab I have on top or can fill with 100mm sand and rest use the soil coming from the excavation?

Do I have to leave it open till inspection or can cover straight away?

Thanks
 

Attachments

Hello Gio,

The following should be required and acceptable, I know United utilities accept it, so would like to think Anglia do as well. 750mm is minimum to prevent undue warming and protection from frost

25mm mdpe pipe
Bedded on sand (can’t remem which type)
Ducting - I used 4” soil pipe (underground) entering the property about 2” above floor level
Sealed at both ends to prevent rodent ingress (something like this https://www.toolstation.com/socket-...MI5PTjp6yI6QIVE-3tCh1AzQHUEAQYBSABEgJCnvD_BwE) although link may not work
Insulation:
https://www.bes.co.uk/pipe-lagging-...MIwt2aoKyI6QIVV-DtCh2Gew9lEAQYBSABEgIrrPD_BwE
 
Chris_W said:
Hello Gio,

The following should be required and acceptable, I know United utilities accept it, so would like to think Anglia do as well. 750mm is minimum to prevent undue warming and protection from frost

25mm mdpe pipe
Bedded on sand (can’t remem which type)
Ducting - I used 4” soil pipe (underground) entering the property about 2” above floor level
Sealed at both ends to prevent rodent ingress (something like this https://www.toolstation.com/socket-...MI5PTjp6yI6QIVE-3tCh1AzQHUEAQYBSABEgJCnvD_BwE) although link may not work
Insulation:
https://www.bes.co.uk/pipe-lagging-...MIwt2aoKyI6QIVV-DtCh2Gew9lEAQYBSABEgIrrPD_BwE
Click to expand...


Hi Chris,

Thanks for your help.

I agree with the 4" soil pipe. I only have doubts on the bend sides as I have two L shapes to make. One horizontal to turn into the house at the deep of 750 and the second one to rise from -750 to above finish level.

Would you use 90 degree bend or 45 degree? Not sure if the MDPE will bend a 90 degree easily specially with the insulation around
 
muggles said:
You need a rest bend - it'll make it much easier to push the pipe round due to the long radius

https://www.screwfix.com/p/floplast-double-socket-rest-bend-87-5-110mm/12719

For some reason @DIYnot are blocking Screwfix links at the moment so you'll need to copy and paste that into your browser
Click to expand...


Found it. make sense the large radius would help a lot. I will use it on the horizontal turn as well. can I?

Will I need to provide stop cock and cap on both far end?

Any spec on all material needed.

Thanks
 
Good option for getting the pipework into the house is the Insuduct. https://groundbreaker.co.uk/products/insuduct/ Lay pipe in a bed of sand, and put a couple of inches of cover over it, the sand is to protect the pipe from any sharp stones in the backfill. Leave a reasonable length of tail at the boundary, AW will connect that onto a stoptap box they provide, before coupling to the main.
 
Last edited:
Hugh Jaleak said:
Good option for getting the pipework into the house is the Insuduct. https://groundbreaker.co.uk/products/insuduct/ Lay pipe in a bed of sand, and put a couple of inches of cover over it, the sand is to protect the pipe from any sharp stones in the backfill. Leave a reasonable length of tail at the boundary, AW will connect that onto a stoptap box they provide, before coupling to the main.
Click to expand...

That`s look good to avoid cutting inside the house. i will have a think about as we are doing full renovation and there is no finish at moment.

They recommend a minimum 32mm thick insulation. Where I get it. Toolstation and Screwfix only have 15mm ones.
 
Lagging on 32mm is only for 22 or 28mm pipe. What they story here. i`m sure you know better than me

Thanks
 
I used an insuduct linked to in the post by Hugh. Easy to fit and allows for access at a later date if required. Complies with the relevant regulations too.
 
And yes you need to leave the trench open until they've inspected (usually on the same day they connect the new pipe).
 
Looks a good idea. Only downside I will have this box sticking outside the wall 140mm. My side walkway is already narrow. Not sure is gonna work
 
About 140mm according to the specs, it's basically a plastic shroud to contain the polystyrene insulation, with the pipework inside. Your choice, but I find them a superior option to breaking out an internal floor and making good the DPM again, after you've got the duct in for the new pipe.
 
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