pipe sizes

[hammers4spanner]

From my understanding with a domestic ticket you can work on pipework upto 35 mm in diameter however chatting to a commercial guy today he informed me that you can only work on very short run on this which he said was something like a couple meters at max due to volume of gas in pipework .Cant seem to find anything on paper to support this so wondered if its actually true??

 

[mfgs]

Its all down to installation volume, the volume of the installation (meter and pipework) has to be under 0.035m3 for domestic. Over that is commercial.

 

[hydrotherm]

Must not exceed installation volume of .035cu mtr . I think 35mm is .00084 per mtr plus meter volume and fittings.

 

[tamz]

If the 35mm is off a U6 you can go a fair distance.
The volume of a U6 is 0.008 so theoretically you could run just under 30m of 35mm (you need to allow 10% of IVp for fittings).
If a U16 is fitted the volume of the meter is 0.025m3 which only leaves you 0.01m3 to play with but thats still around 10m.

 

[hammers4spanner]

Reasons above why this forum is so handy , if i believed half the stuff i hear down the merchants i would never get nothing done