1) Common pipe diameter specifications: dn10, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250.
Standard lengths: 4000, 6000 (mm)
2) Common pipe system (S) specifications: S3.2, S4, S5, S6.3.
3) Pipe fittings are classified by connection method: thermofusion fittings, electrofusion fittings, and mechanical fittings.
① Thermofusion fittings: Thermofusion butt fittings dn≥63; Thermofusion socket fittings dn32-dn160.
② Electrofusion fittings: Electrofusion socket fittings dn20-dn160.
③ Flexible socket fittings dn20-dn160.
