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BS 7291 - Thermoplastics pipes for hot and cold water - dimensions

Dimensions of thermoplastic pipes - PEX and PB according BS 7291

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BS 7291 Thermoplastics pipe and fitting systems for hot and cold water for domestic purposes and heating installations in buildings. General requirements  - is divided in four parts

  • Part 1 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings. General requirements
  • Part 2 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings. Specification for polybutylene (PB) pipes and associated fittings
  • Part 3 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings. Specification for crosslinked polyethylene (PE-X) pipes and associated fittings
  • Part 4 Thermoplastics pipes and associated fittings for hot and cold water for domestic purposes and heating installations in buildings. Specification for chlorinated polyvinyl chloride (PVC-C) pipes and associated fittings and solvent cement

Dimensions Part 2 - PB pipes

PB pipes consistent with EN 1057

Nominal Size
(mm)
Mean Outside Diameter (mm)
Wall Thickness (mm)
Min.Max.Min.Max.
10 9.9 10.1 1.5 1.8
12 11.9 12.1 1.5 1.8
15 14.9 15.1 1.5 2.0
18 17.9 18.1 1.8 2.0
22 21.9 22.1 2.0 2.3
28 27.9 28.1 2.6 2.9
35 34.9 35.1 3.2 3.5

PB pipes consistent with ISO 4065

Nominal Size
(mm)
Mean Outside Diameter (mm)
Wall Thickness (mm)
Min.Max.Min.Max.
10 10.0 10.2 1.5 1.8
12 12.0 12.3 1.5 1.8
16 16.0 16.3 1.5 2.1
20 20.0 20.3 1.9 2.2
25 25.0 25.3 2.3 2.7
32 32.0 32.3 2.9 3.3
40 40.0 40.4 3.7 4.2
50 50.0 50.5 4.6 5.2
63 63.0 63.6 5.8 6.5
75 75.0 75.7 6.8 7.6
90 90.0 90.9 8.2 9.2
110 110. 111.0 10.0 11.2
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