Single-layer PEHD pipes for the construction of gas networks manufactured in SDR 17 SDR17.6 for diameters DN 25-500 and SDR 11 for diameters DN 25-450 according to the PN-EN 1555:2-2012 standard. HD-PE100 high density polyethylene, single-layer (type1) pipes designed for the distribution of gaseous fuels in underground pipelines. They can be laid traditionally in open trench on sand bedding. Pipes are available in coils or straight, depending on the nominal diameter.