Choosing the right pipe diameter is an essential step in ensuring the smooth operation of your plumbing system. The wrong diameter can lead to insufficient pressure, low flow or noisy water circulation. Whether for drinking water supply or wastewater disposal, it’s important to follow certain rules to ensure smooth, efficient distribution.
The importance of the right diameter
A pipe that is too small can cause head losses and reduce the flow of water available at the various points of use. Conversely, a pipe that’s too wide means excessive consumption of materials and slower filling of the pipes, which can lead to water stagnation and limescale deposits.
Criteria to consider:
- Network pressure: a diameter that is too small can accentuate the pressure drop.
- The number of appliances to be supplied: the more water points there are, the larger the diameter needs to be.
- Type of installation: drinking water supply and wastewater drainage require different diameters.
Recommended diameters for drinking water supply
Water supply systems must guarantee sufficient flow for all sanitary equipment, while maintaining constant pressure. Standard diameters vary according to the appliances to be served.
- Main water meter: 25 mm to 32 mm
- Main distribution to water points: 16 mm to 20 mm
- Faucet and fixture feed: 10 mm to 12 mm
In the case of PER or multilayer pipes, diameters are expressed in terms of outside diameter, whereas in the case of copper, the inside diameter is used. It is essential to adapt the choice according to the length of the network and the available pressure.
Recommended diameters for wastewater drainage
Drainage pipes must be large enough to allow smooth flow, while avoiding clogging and rising odors.
- Sink, basin, shower: 32 mm to 40 mm
- WC: 100 mm
- Main drain: 100 mm to 125 mm
A slope of at least 1 cm per meter is recommended to ensure proper drainage of wastewater and avoid stagnation.
Adapting diameters to specific constraints
In some cases, it may be necessary to increase the pipe diameter slightly:
- If the distance between the meter and the water points is long.
- If several devices are connected to the same pipe.
- If water pressure is low and needs to be compensated by a larger diameter.
Call on Leader Services
Proper pipe sizing ensures the comfort and durability of your installation. Leader Services will help you choose the right diameters for your network, and ensure that your installation complies with the relevant standards.
- Discover our plumbing services: Leader Services – Plumbing
- Need a professional? Contact us here: Leader Services – Contact
Conclusion
The choice of pipe diameters is a key element in efficient, trouble-free plumbing. Proper planning helps avoid pressure loss, flow noises and drainage problems. Adapting sections to the specific needs of your installation guarantees optimum comfort and increased durability.
