TEMPERATURE PRESSURE REDUCTION FACTOR GRAPH

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.

PEAD TUBE USEFUL LIFE GRAPH

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

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

RESISTANCE OF HIGH DENSITY POLYETHYLENE TO CHEMICAL AGENTS

The results provided below were obtained after 55 days, in test tubes (50 x 25 x 1) mm
NOTE: * Aqueous solutions at any concentration
** With reduced mechanical effort

Conventional signs:

x = Resistant swelling <3% or weight loss <0.5% tear elongation without appreciable alteration
/ = Swelling 23-8% or weight loss 0.55-5% and / or tear elongation decrease> 5%
.D = Discoloration

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