Stepping up new connection from 25mm to 32mm

Discussion in 'Plumbers' Talk' started by Chris_M, Jun 22, 2021.

  1. Chris_M

    Chris_M New Member

    Looking for a little bit of plumbing advice if possible.

    We are getting a new mains water connection to a currently undeveloped property. The water main in the road is 4" UPVC which is apparently quite small. As a result of this the water board will only give us a 25mm connection.

    If we have a 25mm connection from the main to the boundary box (approx 4m length), would there be any benefit in stepping this up from 25mm to 32mm from the boundary box into the property?

    Any recommendations are greatly appreciated, thanks.
  2. Severntrent

    Severntrent Screwfix Select

    Working on a flow fig of 20l/min (10l/min is considered acceptable by WA) the head loss along a 25mm pipe, (assuming a 25m length of connection pipe) is 0.7m, a 32mm pipe gives 0.2m,
    so the difference in head loss is 0.5m. Assuming a supply pressure of 20m at your boundary box the pressure drop at the house will be less than 2.5% which is nothing in reality.
    Chris_M likes this.
  3. Chris_M

    Chris_M New Member

    Thanks for your response - much appreciated!

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