Pressure PE pipes for water made of PE 100 (or less often P80) in black or blue are intended for the construction of water supply networks. Pipes of smaller diameters are wound as coils (usually up to DN110), while larger diameters are straight sections with a length of 12 m. The operating pressure range is from PN6 to PN16. The sections are joined by welding (butt or electrofusion welding) or by means of twisted fittings (smaller diameters).