====== Diamètre en plomberie ======

Filetage "standard" = Filetage BSP (British Standard Pipe) cylindrique (ex G 1/8) 

^ DN ^ Inch ^ Ancien ^ Diam. Ext. ^ Diam. Int. ^ Filet /in ^ Pas ^
|  DN 6   |  1/8"   |  5 x 10   |   9,73  |  8,57   |  28  |  0,91  |
|  DN 8   |  1/4"   |  8 x 13   |  13,16  |  11,45  |  19  |  1,34  |
|  DN 10  |  3/8"   |  12 x 17  |  16,66  |  14,95  |  19  |  1,34  |
|  DN 15  |  1/2"   |  15 x 21  |  20,95  |  18,63  |  14  |  1,81  |
|  DN 20  |  3/4"   |  20 x 27  |  26,44  |  24,12  |  14  |  1,81  |
|  DN 25  |  1"     |  26 x 34  |  33,25  |  30,29  |  11  |  2,31  |
|         |  1"1/8  |           |  37,90  |  34,94  |  11  |  2,31  |
|  DN 32  |  1"1/4  |  33 x 42  |  41,91  |  38,95  |  11  |  2,31  |
|  DN 40  |  1"1/2  |  40 x 49  |  47,80  |  44,84  |  11  |  2,31  |
|  DN 50  |  2"     |  50 x 60  |  59,61  |  56,66  |  11  |  2,31  |
|  DN 65  |  2"1/2  |  66 x 76  |  75     |         |      |        |
|  DN 80  |  3"     |  80 x 88  |  87,88  |  84,93  |  11  |  2,31  |

A noter existe aussi en conique (ex R 1/8)

Différent du NPT (National Pipe Thread)

==== "Standard" ====
|  Robinet Lave Main Eau Froide Uniquelent  |  G1/2" 15x21  |
|  Robinet / Mitigeur  |  G3/8" 12x17 __**OU**__ G1/2" 15x21  |
|  LL / LV  |  G3/4" 20x27  |


===== Diamètre des tuyaux =====
==== Alimentation ====
|    |  Ø Minimum  |  Ø Recommandé  |
|  WC/Bidet  |  8x10  |  10x12  |
|  Lavabo/LL/LV  |  10x12  |  12x14  |
|  Douche/Evier  |  12x14  |  14x16  |
|  Baignoire  |  14x16  |  16x18  |
|  Robinet Puisage  |  12x14  |  14x16  |

==== Evacuation ====
|    |  Ø Minimum  |  Ø Idéal|
|  WC  |  100  |  100  |
|  Lavabo/Bidet  |  32  |  40  |
|  Douche/Baignoire  |  40  |  60  |
|  Evier  |  40  |  40  |
|  LL/LV  |  40  |  60  |
|  Descente Eaux ménageres |  50  |  80  |
|  Descente Toilettes  |  100  |  125  |