Silane cross-linked polyethylene pipe INTERSOL ... - Watts Industries

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SILANE CROSS-LINKED POLYETHYLENE PIPE 10 - LINEAR THERMAL EXPANSION OF INTERSOL ® PEX-b The variation in pipe length against rise in temperature can be calculated using the following formula: 14 ΔL = ∂ x L x ΔT where ΔL = variation in length (mm) ΔT = variation in temperature (°C) L = pipe length (m) ∂ = coefficient of linear expansion = (average value 1,8 x 10 -4 ) Example: ΔT = 50°C L = 6 m ΔL = 54 mm (see graph) 180 Linear expansion Vs. increase in temperature 10 160 140 Pipe lenght (m) 9 8 7 Variation in lenght (mm) 120 100 80 60 6 5 4 3 40 2 20 1 0 0 20 40 60 80 100 Variation in temperature (°C)
SILANE CROSS-LINKED POLYETHYLENE PIPE 11 - OTHER PROPERTIES OF INTERSOL ® PEX-b 11.1 - Two-step Sioplas method Thanks to its flexibility, INTERSOL ® PEX-b can be “cold” bent up to bend radii equal to 5 times the outer diameter. For smaller bend radii, it is necessary to heat the pipe using hot air at 130 – 150°C (never use a direct flame). 15 Table 13 Outer diameter Cold bending Hot bending 12 60 27 14 70 31 15 75 34 16 80 36 17 85 38 18 90 40 20 100 45 25 125 56 11.2 Behaviour on exposure to light INTERSOL ® PEX-b should be stored and installed away from direct exposure to sunlight. The UV rays would cause aging of the material, thus impairing the chemical-physical and mechanical properties. 11.3 Behaviour at low temperature The water contained in the pipe must not freeze because the variation in phase would cause an increase in volume with risk of the pipe caving in. Anti-freeze substances can be used for applications below 0°C. 11.4 Pressure drop The advantage of INTERSOL ® PEX-b is that it has an internal surface free from roughness. Therefore it will remain free from encrustations during the years of service and with very low coefficient of friction. The pressure drops for transport of water at 20°C are given in the following graph where the correction factors associated with the different water temperatures are given. N.B. where anti-freeze substances are present, due account should be taken of the variation in viscosity of such solutions. 10000 Pressure drop per metre of pipe (Water temperature = 20°C) Conversion temperatures for other temperatures: 30°C=0,95 40°C=0,92 50°C=0,88 60°C=0,85 80°C=0,82 Pressure drop/metre (mm CA/m) 1000 100 10 1 8 10 Inner diameter (mm) 12 13 14 16 18 20 22 24 26 0,1 m/s 0,2 m/s 0,3 m/s 1,0 m/s 0,9 m/s 0,8 m/s 0,7 m/s 0,6 m/s 0,5 m/s 0,4 m/s 4,0 m/s 3,5 m/s 3,0 m/s 2,5 m/s 2,0 m/s 1,5 m/s 0,1 10 100 1000 10000 Flow rate (lt/h)
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Silane cross-linked polyethylene pipe INTERSOL ... - Watts Industries

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