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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)

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Wall Thickness (mm)

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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)

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Wall Thickness (mm)

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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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