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The diameters are expressed in outer diameter / inner diameter.
How to calculate the thickness? Simple: (De-Di)/2 .
Example: Ø70(e)/64(i) mm --> thickness = (70-64)/2 = 3 mm

Formula for calculating the maximum internal pressure permitted:

P¹= 50xS
Valid for
≤ 1,2


Where:

P¹= Pressure inside the tube atmosphere or bar (1bar=0,1 N/mm²)
S= Thickness of the pipe in mm.
D°= outside diameter in mm.
D¹=inner diameter of the pipe in mm.
This formula is valid in standard test conditions, so at an ambient temperature of 20 ° C and relative humidity of 50%.

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