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For every bathroom or bathroom sanitary, respecting the correct pipe diameters is fundamental. This avoids, in particular, a significant drop in water flow when several devices are used simultaneously.

Copper piping.

Plumbing installation with copper pipes.

For a sanitary installation, the diameters of the hot and cold water pipes (as well as the evacuations) to be respected, whether copper, PER or multilayer, are indicated in the unified technical documents (DTU) 60.1 and 60.11 which regulate the implementation of sanitary plumbing.

Sanitary plumbing network: respect the rules and anticipate

For each project, it is advisable to anticipate its needs before starting. If, for example, the installation of a second bathroom is envisaged in a more or less near future, it is preferable to adapt from the outset the water distribution network in a diameter greater than that recommended for a second bathroom. unique bathroom.

Pipe diameters: assess priorities

For the realization of a power network, the essential rule is always to favor a larger diameter for pipes intended for high volume sanitary installations. These include those of the bath, shower or sink, which are different from those of a sink or a washbasin. To maintain a constant pressure from the meter to the sanitary, the network must, in the case of copper for example, start at 18-1 diameter and extend by 16-1 transplants for the distribution of power supplies.
With regard to sanitary evacuation, their diameter must never be less than the output of different devices: 50 mm for a sink or sink, 30 mm for a dishwasher, etc.

Before choosing the right fitting (soldering, crimping, clipping...), it should be known that in plumbing diameters are frequently expressed in inches and fractions of inches. Here are the equivalences:

Section in inches

Outside diameter (Mm)

1/8

10

1/4

13

3/8

16,5

1/2

21

5/8

23

3/4

26,5

7/8

31

1

34

1-1/4

42

1-1/2

49

1-3/4

55

2

60

2-1/4

70

2-1/2

76

2-3/4

82

3

90

A sanitary installation with the right dimensions

The diagrams presented here are based on the new denomination of the diameters of the tubes. While the inside / outside diameters were taken into account, today the outer diameter and the thickness are the norm. Thus, there is no longer a tube in 10/12 but a tube in 12 x 1 for copper, 12 x 1.1 for the PER and 16 x 2 for the multilayer. The first digit is always the outer diameter, the second is the thickness.
But beware, in GSB, we always find on the shelf, especially for copper, products still labeled with the old name. Do not hesitate to take advice from the seller!
Copper plumbing diameters

How to choose the right pipe diameter for a plumbing network: choose


PER plumbing diameters

How to choose the right pipe diameter for a plumbing network: pipe


Multilayer plumbing diameters

How to choose the right pipe diameter for a plumbing network: choose


Video Instruction: how to calculate pipe diameter, velocity and flow rate in plumbing engineering