MDPE 32 or 25mm into the house

[Scott_D]

Have you got an outside tap. Internal taps may have flow restrictors

 

[seb963]

Yes - I have just measured at the garden tap. Flow is much higher indeed, about 20L per min. The question is, would the flow have been even better with a 32mm ?
I am not too bothered by the downstairs taps because flow is ok, but I do worry about the flow I would get in the loft on hot and cold water, hence the question to know if a 32mm MDPE would habe maximised the chances of getting a better flow, or not.
Regards

 

[Ch4 plumbing]

If the builder has just run a new main in I would take a guess that you will need to have any and all filters and aerator's on the system cleaned of muck, grit and sand from the installation.

Also if you have paid SW to put a 32mm stopcock in then I would have expected the builder to run a 32mm Cold water main into the house!!

Has the builder had the new main inspected??

 

[joni os]

25mm is size recommended by most water companies for domestic properties when length of run less than 40 metres. If not getting 24 litres/min, at 40 metres, restriction is other than MDPE pipe.
Unless length exceeds 40 metres or you specifically asked for 32mm, Builder cannot be blamed on pipe size.
Flow at meter can easily be checked by standpipe. This would confirm there is not a problem with residual tag at tapping.

 

[seb963]

Thanks. Run of th 25mm MDPE is less than 40m. Thames Water stopcock is about 5 meters in front of the house. Flow at garden tap is about 20L/min.

 

[Ch4 plumbing]

25mm is size recommended by most water companies for domestic properties when length of run less than 40 metres. If not getting 24 litres/min, at 40 metres, restriction is other than MDPE pipe.
Unless length exceeds 40 metres or you specifically asked for 32mm, Builder cannot be blamed on pipe size.
Flow at meter can easily be checked by standpipe. This would confirm there is not a problem with residual tag at tapping.

For the cost involved of upgrading from 25mm to 32mm in materials why would the builder NOT just use 32mm MDPE if that is what the meter out let pipe size is?

Why pay for a meter upgrade and then not take advantage of it??

 

[joni os]

For the cost involved of upgrading from 25mm to 32mm in materials why would the builder NOT just use 32mm MDPE if that is what the meter out let pipe size is?

Why pay for a meter upgrade and then not take advantage of it??

Think we are reading OP differently. Supply pipe in road is 32mm but 32 mm stopcock most unlikely. Meter outlet pipe size usually 25mm for domestic, and water companies will resist installing larger size.

 

[ShaunCorbs]

Think we are reading OP differently. Supply pipe in road is 32mm but 32 mm stopcock most unlikely. Meter outlet pipe size usually 25mm for domestic, and water companies will resist installing larger size.

"Thames Water upgrade my mains connection to a 32mm MDPE," so i read that as 32mm to a meter or the stop tap?

 

[joni os]

"Thames Water upgrade my mains connection to a 32mm MDPE," so i read that as 32mm to a meter or the stop tap?

Perhaps OP will confirm if 25mm went straight into push fit connection at meter or if TW left 1 metre of 32 mm for external connection.
In my area the water company would be screaming, "Infrastructure Charge", for a straight 32mm run through.

 

[Ch4 plumbing]

Think we are reading OP differently. Supply pipe in road is 32mm but 32 mm stopcock most unlikely. Meter outlet pipe size usually 25mm for domestic, and water companies will resist installing larger size.

Yep I agree with you that a standard metre installation is 25mm MDPE but you can have 32mm MDPE if your property design requires a larger flow rate, it might not be easy but it is achievable.

Maybe the OP can clarify for us?