REVINCA, C.A. Tomado de la norma ISO 4427 – COVENIN 3833

Figure 1 - Pressure reduction factor vs. temperature, applicable to a useful life of 50 years.For temperatures in the range of 20 ° C and 60 ° C, the pressure reduction factor given in Figure 1 must be applied, by using the extrapolation according to the ISO 9080 standard.

VENEZUELAN STANDARD COVENIN 1774 POLYETHYLENE (PE). TUBES FOR THE DRIVING OF NON-DEGRADING FLUIDS REQUIREMENTS

Since the roughness factors of the HDPE are much lower than that of conventional pipes, it makes the pressure losses in HDPE pipes minimal.

Figura 1 – Factor de reducción de presión vs. temperatura, aplicable a una vida útil de 50 años.
Para temperaturas en el rango de 20 °C y 60 °C, el factor de reducción de presión dado en la figura 1 deberá ser aplicado, mediante el uso de la extrapolación de acuerdo con la norma ISO 9080.

Graphical extrapolation for 50 years of the resistance curve as a function of time for 20º C