TECHNICAL MANUAL - Sharq.biz

exercise pressures of PE pipelineswater distribution UNI EN 12201The polyethylene is a material with viscoelastic characteristics: because of thematerial creep, the mechanical resistance drops down by increasing of thetemperature.When a polyethylene piping system is operating at a constant and continuoustemperature higher than 20°C and up to 40°C, a pressure reduction coefficientis applicable; in the following table the operating admissible pressure valuesare reported according to the exercise temperature derived from the nominalpressure PN of the pipe applying the reduction coefficients defined in theAppendix A of the standard UNI EN 12201-1.ADMISSIBLE OPERATING PRESSURE ACCORDINGC° TO THE EXERCISE TEMPERATURE[bar]20 5,0 6,0 8,0 10,0 12,5 16,0 20,0 25,030 4,3 5,2 7,0 8,7 10,9 13,9 17,4 21,840 3,7 4,4 5,9 7,4 9,3 11,8 14,8 18,5fuel gas transport D.M. 16.04.2008The following table reports the values of the maximum exercise pressureaccording to the standard dimensional ratio SDR of the pipe and the minimumresistance required MRS of the polyethylene, valid for fuel gas transport pipelines,considered by applying the safety coefficient K=3,25.dimensions allowed PE80 - pressure PE100 - pressureSDR [mm] [bar] [bar]17,6 ≥ 63 3,0 3,711 ≥ 16 H 5,0 5,0H The standard UNI 9034 establihes a minimum thickness of the pipe t c equal to 3 mm6